Project KP61: The Finicky Bits Begin
Pedal Car Racer

I’m not totally sure when, how and why I decided I’d cram the mechanicals from a vehicle distinctively not a KP61, into my KP61 shell. But I do know that when I embarked on the project I never anticipated just how in-depth this whole build was going to get.

Perhaps I underestimated the amount of work required to undertake such a project, but nonetheless the Starlet is progressing to the stage where the lifelines between all of the major components are requiring fabrication and install. While it’s all pretty interesting stuff, there’s definitely an element of lateral thinking required to make it all fit.

Project_KP61_4AGE (1837)

What better kind of day than a positively beautiful Saturday morning then, to get cracking on a couple of the final major fabrication tasks left on the car: the mounting of the new interior pedal box and a gearbox crossmember. The car was duly loaded on a trailer and off we trundled to our friendly neighbourhood Sheepers (you might remember him from his magical MS51 Crown creation) who was up for the challenge of solving the quandaries at hand.

Project_KP61_4AGE (1870)

This was the culprit in question – a pretty basic Wilwood reverse swing type pedal box. I did initially consider a floor mount unit, but the tight dimensions of the KP61 cabin just would have made it an impractical choice. This particular unit has a 6.25:1 pedal ratio, and I’ve chosen 3/4-inch and 5/8-inch master cylinders for the front and rear circuits (calculated using the piston sizing) and a 3/4-inch master to suit the clutch.

Project_KP61_4AGE (187)

The first step was to find out what we were dealing with dimensionally. A plan had already been roughed out for the mounting by this stage.

Project_KP61_4AGE (191)

Stage one of the metalwork involved the construction of a steel frame which would mount the pedal box on a horizontal plane. All very simple – four mitred sections of right-angle steel TIG-welded together.

Project_KP61_4AGE (189)

After a measurement from the firewall (and the first time around, we got this wrong….) the pedal box required clamping into place on the frame…

Project_KP61_4AGE (190)

And mounting holes then drilled for the 4 M10-ish (whatever the equivalent is in an imperial size, 3/8-inch, I guess?) mounting lugs. This shot shows the locations being marked; the actual holes were drilled using a bench mount drill press.

Project_KP61_4AGE (192)

All mounted up, the frame and pedal box combo offered a pretty rigid construction due to the heavy gauge steel used. Too much flex when stomping hard on the brakes would present a less than ideal situation after all.

Project_KP61_4AGE (194)

The forward edge of the unit mounts directly against the firewall, picking up two mounting points left behind by the original brake booster. Because the firewall surface isn’t totally flat across the distance this needed to mount against, so a couple of threaded lugs needed to be TIG-welded to the frame.

Project_KP61_4AGE (197)

Visible here is the 20-degree angle bent into the frame. The framework serves a dual purpose; as well as securing the pedal box it also provides the mounting location for the steering column, so some careful measuring versus the original column mount was required in order to get the location right.

Project_KP61_4AGE (200)

With each of the top stays TIG-welded and braced to the main structure it was time for a test fit, without the cylinders and reservoirs. Verdict? A perfect fit. Some clearancing was then required in order to fit the assembled pedal box and master cylinder unit.

Project_KP61_4AGE (201)

The net result (bar any painting or final touch up stuff) was as above. Note the steering column mounted in place. The whole structure is extremely rigid; with two of us trying to twist the assembled unit with all of our weight it wouldn’t budge, so should be suitable for some panic stops when I inevitably out-brake myself on track.

And yes, the reservoirs will be staying in that location beneath the dash. To refill or check the fluids it’s not as simple as it could be, but only a matter of six screws and they’re accessible. The logic behind it? Mounting them in the engine bay I just can’t get enough fall on feed hoses – another drawback of such tight confines in the KP61 shell.

[Cross]Members Only
Project_KP61_4AGE (1347)

The pedal box consumed a full Saturday (delays for mugs of piping hot English Breakfast, then later for ice cold beer surely can’t be considered build time), so while the pedal box reached completion, the goal for the Sunday was to get the gearbox mounted securely to the floorpan.

Project_KP61_4AGE (1330)

Here’s the state of play at the beginning. Using a length of cable, the gearbox was lifted into its suitable position. Visible here are the factory mounts on the floor, which are further forward than the Cusco mount which is just forward of the output shaft of the T50 gearbox.

Project_KP61_4AGE (1320)

Beginning with an OEM crossmember from a TE71 Levin, a jig of sorts was constructed which mapped out both the floorpan mounts as well as the gearbox mount. This in turn enable the forward facing ‘wings’ to be welded to the soon to be very non-OEM crossmember.

Project_KP61_4AGE (1314)

Here, the second of two extensions receives its final bead of weld, having been tacked on in place and offered up to the floorpan to ensure measurements were all within spec.

Project_KP61_4AGE (203)

With the extensions in place, it was time to organise gusseting to ensure rigidity and strength; the gearbox crossmember has potential to take a bit of punishment as one of the lower hanging points on the underside of the car. Using cardboard templates, the gussets were traced onto steel, and cut out using the grinder, followed by a quick visual to confirm the fit was going to be acceptable.

Project_KP61_4AGE (1180)

Plenty of adjustments were made during this process, simply to obtain the most seamless fit possible in the given situation. That is, in a shed with some pieces of steel, a grinder and a welder, and the a clear absence of CAD software and laser cutting capabilities.

Project_KP61_4AGE (1207)

Satisfied the gussets were going to serve their purpose, it was time to weld (some more… always with the welding!).

Project_KP61_4AGE (1144)

The completed unit resembled something like this – not pretty at this stage but the functionality side of things is well in check.

Project_KP61_4AGE (1120)

Of course, a final fitment was necessary and the job was done. There is one small task to complete on this, which is to plate the bottom section for additional strength. But given the engine and ‘box is going to need to all come out again, this will be completed at that stage, along with some minor modifications to engine mounts and a few other jobs before all of the fabricated parts are stripped and prepared for coating.

A Surge Of Motivation
Project_KP61_4AGE (163)

Mounting the engine, the gearbox, and even shortening the diff to suit the car – all of that could be considered the ‘fun’ bits of piecing together a project build. The not so fun bits? Putting the ‘services’ throughout the car. Likened to a building, this is the plumbing, the wiring, the fuel system – and this, possibly the single most boring photo ever posted on Speedhunters of the car’s original fuel tank post-acid dipping exemplifies the initial enthusiasm with which I approached the task of fuel.

Project_KP61_4AGE (2338)

In a nutshell, the original tank, designed to suit a carburettor, wasn’t going to suit the fuel system in its standard state. That is to say, I wanted an in-tank type pump with no mucking around with lift pumps, surge tanks and main pumps all cluttering the underside of the car. So we needed to design and build a means of preventing fuel surge and accommodating an in-tank EFI-type fuel pump. This job was entrusted to Jon and Chris of Strange Workshop in Auckland, who also did some top-notch work on Taryn and Pedey’s Project Z a while back. The first step was to chop open a sacrificial tank, and work out what we were dealing with.

Project_KP61_4AGE (2436)

Once the location for the inbuilt surge compartment was ascertained, why not make it easy by cutting the required section out of the scrap fuel tank, transcribing the measurements onto the ‘good’ tank and marking it out ready for cutting.

Project_KP61_4AGE (2467)

Jon’s a deft hand with a grinder, taking on an ‘easy does it’ mantra. The old adage of measure twice, cut once, was adhered to as the grinder made short work of the factory steel tank.

Project_KP61_4AGE (2327)C

The scrap fuel tank also donated the flange which would accept the new fuel pump cradle; incidentally this flange originally served as the filler for the tank. The flange was chopped out, ground and linished to a round shape then welded in place on the tank where the original carb fuel lines would have been located.

Project_KP61_4AGE (2414)

In the meantime, Chris cracked on with the surge tank, folding up a compartment of roughly 3-litres in capacity using some fresh sheet metal.

Project_KP61_4AGE (2451)

Step two was of course to TIG-weld the joins of the surge tank together.

Project_KP61_4AGE (2481)

Then all of a sudden, a simple rectangular container is the net result, ready to be test fitted against the hacked up fuel tank.

Project_KP61_4AGE (2489)

The initial test fit involved ensuring the surge tank was sharing the same vertical plane as the fuel tank would when mounted beneath the car. The seam running around the circumference of the tank offered a simple reference.

Project_KP61_4AGE (2585)

Tacked in, awaiting final welding the companion to the tank mounted flange began to take shape. Again born of a repurposed part, we elected to use a pair of -6AN fittings welded to steel feed and return lines below the tank with a steel cradle slung beneath accommodating the pump itself.

Project_KP61_4AGE (2604)

Without the surge tank installed, the assembly looks something like this – mounted on its side with ample fuel to draw from is a Walbro fuel pump with a flow capability exceeding that of the fuel requirements the 4A-GE might have.

Project_KP61_4AGE (2618)

And out of the tank, the pump itself dummied up within the surge tank giving an indication of how the setup should work. As the walls of the surge tank protrude above the bottom level of the tank, several holes were required to permit the draining of fuel into this compartment, but sparing enough to trap fuel inside when levels get low to reduce possibility of fuel surge under cornering or acceleration. In theory, the fuel warning light will illuminate long before this is even getting near empty which I hope will provide enough of a safeguard to refuel.

Project_KP61_4AGE (204)

It’s a time-hungry process. So the next time the fab shop hands you an invoice, before disputing the cost definitely take a moment to consider the time and expertise spent solving the problem you’ve presented them. In my case the tank is not completely finished (awaiting final welding, leak testing and refinishing), but Project KP61 is definitely taking some giant leaps forward thanks to some talented fabrication assistance.

Next on the list is to bend up a variety of brake hard lines from the pedal box to each corner of the car, and then to start tackling the wiring loom and solve a couple of niggly little problems, one of which is finding a suitable heater tap to mount beneath the dash. Either way, I’m motivated, and blessed with some of the best friends a car nut could want to crack on with getting this thing to the finish line!

Richard Opie
richy@speedhunters.com
Instagram: snoozinrichy

More stories from New Zealand on Speedhunters

ADVERTISEMENT

Comments

Add comment

E-mail is already registered on the site. Please use the Login form or enter another.

You entered an incorrect username or password

Sorry, you must be logged in to post a comment.

32 comments

by Oldest
by Best by Newest by Oldest
1
Justneedsanothersticker

Really enjoying the detail shots on this build. Keep it coming...

2

state homes make underrated backgrounds for car shots, even more so if you grew up in one. Good detail and I like how this post was presented.. it's almost the antithesis to a majority of articles we see on here featuring near-triple digit dollar builds. It's a reminder that it's not all flashy sexy mods but the hard tedious work on boring (but functional and vital) parts is an afterthought in a few articles.

3

Superb build. Curious to your opinion on the bumpers. Think the Starlet looks great bumperless but are you trying to stay as true as possible to the aesthetics of the original?

4

Awesome update.

Makes me really appreciate the difficulty in making even the simplest improvements to an older car, big respect.

5

John Key NZ Agreed, but "triple-digit dollar" builds? As in hundreds of dollars? That sounds more like my budget...

6

Chuck a rotor in it!

7
TarmacTerrorist

More of the wheels dammit, MORE OF THE WHEELS!
Ahem.
Coming together very nicely, should be a hell of a car. Top job.

8
90nissanS13@my350z

Instead of drilling through your brand new pedal mount, have you ever considered using transfer-punches? Maybe you've known of them or maybe not...

They are great for fabrication just like this.

Keep up the good work, it's refreshing to see behind the scenes from other projects!

9

Fender mirrors make it look like a little cartoon insect. If thats your goal than youve done a great job. I agree with paddy, every little thing can become tons of work when you are making it your own. You look like your more than capable by the picks.

10
90nissanS13@my350z

Paddy McGrath  It's good for everyone to understand that. It might humble those who want to nit-pick at other's projects.

11

That's a new one. They're there, because they're factory and the overall ethos behind the car is to have it (looking at least) like something from its homeland would have done in period. I'm lucky to have a handful of talented friends to assist with making my ideas into metal reality!

12

You're right yeah the bumpers are staying basically because I want the exterior to look near original. I'm personally not a fan of removing the bumpers on these but the slimmer steel NZ market bumpers may be an option further down the track.

13

Thanks yeah I am familiar with transfer punches... not something available to us at that time! Either way the result was totally acceptable with no marking or damage to the pedal assembly.

14

I'll chuck a rotor at you m8. Do you remember when they used to have "rotor throw" event at Nats? Speaking of chucking rotors....

15

Cheers! It's all the bloody little jobs now... the fiddly, not particularly gratifying stuff because none of its on display. It's always a bit tougher with an unsupported platform, be it old or new though!

16

SnoozinRichy now everyone needs a snuggle blanket.... or a clutch in someone's forehead

17
ToyotaObsession

Fucking badass. Thanks for sharing some of the nitty gritty that goes into making a car like this. I don't think people realize how much work truly goes into these cars.

18

And this is a relatively small project compared to many out there. All the little things take a far whack of time.

19
90nissanS13@my350z

SnoozinRichy  Right on, We never have that one tool that would be perfect in the moment.

20
90nissanS13@my350z

SnoozinRichy  Haha, right. I feel your pain. Someone, some day will see the work regardless. Maybe it's the next owner who takes it apart.

On the other hand, the market is flooded with parts for my current project and I still choose to make my own when it's cost effective.

21

Man I love this build. It's refreshingly different! Love seeing the thinking and ingenuity put into each "mini" project ultimately leading to final overall build. Good stuff, can't wait for the next installment!

22
ToyotaObsession

True. But watching it be done in a garage gives me hope maybe I could do something a quarter as cool.

23

I enjoy seeing how people approach thier projects and fabrication. Thats one of the best things about the site. Looks like your doing great. And the mirrors; this is speedhunters after all, so once the overfenders and gt wing go on it won't look like pixar made it anymore.

24

beautiful car

25

YAY

26

No stone unturned, love it. great work thus far.

I have however a few suggestions for you regarding the pedal box. I would strongly suggest putting the pedals on the bottom of the bracket you made and welding captive nuts on top. The ability to drop the pedal set while keeping everything else together is so big. where its located means you'll more than likely have to drop it to adjust it and change/service it. I would also suggest doing some -3 braided lines from each master to bulkhead fittings either on a plate welded to the firewall or directly out the firewall. It allows you to drop the pedals easily and prevents the potential ruining of hard lines from removing them each time you take them out. 

Also Wilwood does make even shorter master cylinders than the ones you have if space becomes a concern.

Not sure where in the engine bay you would want those master cylinders (if you were considering that) but if they are higher than the masters even if its only a little, they will gravity feed just fine. Being able to check fluid level quickly is another thing that can become huge on a track day.

Love the built in surge tank btw...

27

CJC_Matty John Key NZ i mean 6 digit... that's what happens when you come and comment on SH after a long days work, instead of just enjoying the article :P

28

Richy, you're breaking my heart, someone has stolen one of your pedals!
Joking aside, I am really impressed with the amount of skilled fabrication on all three aspects of the build update. It is a real treat to see how the process works from open box to bolted product, especially with how they went about planning the tank issues with a sacrificial tub. Still one of my favorite projects, can't wait for more updates on this lil guy.

29

Delish m9, Keep it chuggin along, one day I might even get my 4age into the wagon, only been built for like 2 years now :/.

Anyway mate lovin every update.

30

teeson You'll be happy to know some of your advice has been taken on board - while the pedalbox remains mounted on the top of the frame, the hardlines from each master cylinder have been router to bulkhead fittings on the frame itself - meaning dropping it all is fairly simple. And yes, I have used -3 Speedflow fittings on all my brake lines. Thought I'd advise :)

31

good car for the race and I'm sure very fast http://yakuza4d.com/

32

the car was very good 
really really like to see the car that shiny new car fits like made ​​for walking trailsthe car was very good http://utamadomino.com/app/img/peraturan.html" rel="dofollow" target="_blank">http://utamadomino.com/app/img/peraturan.html and very fast http://utamadomino.com/app/img/jadwal.html" rel="dofollow" target="_blank">http://utamadomino.com/app/img/jadwal.html mix of colors http://utamadomino.com/app/img/promo.html" rel="dofollow" target="_blank">http://utamadomino.com/app/img/promo.html from which to http://utamadomino.com/app/img/panduan.html" rel="dofollow" target="_blank">http://utamadomino.com/app/img/panduan.html make want pobud http://utamadomino.com/ see hatnya http://dokterpoker.org/app/img/peraturan.html" rel="dofollow" target="_blank">http://dokterpoker.org/app/img/peraturan.html kecepatanya http://dokterpoker.org/app/img/jadwal.html" rel="dofollow" target="_blank">http://dokterpoker.org/app/img/jadwal.html was very nice ,http://dokterpoker.org/app/img/promo.html" rel="dofollow" target="_blank">http://dokterpoker.org/app/img/promo.html  suitable for a "http://dokterpoker.org/app/img/panduan.html" rel="dofollow" target="_blank">http://dokterpoker.org/app/img/panduan.html sharp bend http://dokterpoker.org or not sharp I guess motorists http://633cash.com/Games like this is http://633cash.com/Pengaturan" very skilled in the speed I hope I can membilinya someday will whether http://633cash.com/Daftar http://633cash.com/Promo there are http://633cash.com/Berita new cars http://633cash.com/Livescore are better I http://raksasapoker.com/app/img/peraturan.html" rel="dofollow" target="_blank">http://raksasapoker.com/app/img/peraturan.html 'll wait for it , with a stylish car classic http://raksasapoker.com/app/img/jadwal.html" rel="dofollow" target="_blank">http://raksasapoker.com/app/img/jadwal.html style I http://raksasapoker.com/app/img/promo.html" rel="dofollow" target="_blank">http://raksasapoker.com/app/img/promo.html also like http://raksasapoker.com/app/img/panduan.html" rel="dofollow" target="_blank">http://raksasapoker.com/app/img/panduan.html to see would be http://raksasapoker.com/ whether there is a http://yakuza4d.com/peraturan" rel="dofollow" target="_blank">http://yakuza4d.com/peraturan car that is http://yakuza4d.com as fast and forius http://yakuza4d.com/home like in the "http://yakuza4d.com/daftar movie , the car very http://yakuza4d.com/cara_main good car http://yakuza4d.com/hasil designed a way apparently hopefully http://yakuza4d.com/buku_mimpi there will be new cars more good and the price is quite pantastis then chances are I can membilinya the same as you have at this time

OFFICIAL SPEEDHUNTERS SUPPLIERS