My Mr2 F20c conversion

Re: My Mr2 F20c conversion (sir_smeghed)

Wed, 13 Dec 2017 01:17:59 GMT

Ok folks, I am now the proud owner of this wonderful machine and thought I would post an update.

This F20C powered SW20 is now rocking a set of late model turbo SW20 brakes and 1 inch master cylinder on the standard booster (will upgrade boosters at some time). It has an APEXI AFC-NEO (signal highacker) to smooth out the fuel curve, unfortunately it doesn't modify the timing so it's not really giving a noticeable power increase but one day when the $$$ permit I will upgrade computers.

I have modified the exhaust and it flows much better but mostly to make the car sound better, and it sounds fantastic now!

After a fairly recent track event at Queensland Raceway the clutch plate literally disintegrated so I have had NPC build a custom clutch to suit this setup, with a new S54 box and helical LSD. Sadly it is still a 3.9 diff ratio which doesn't suit this engine at all, but fingers crossed there may be an improvement on the horizon.

Still working on some maintenance issues, but am almost there.

Queensland Raceway Clubman Circuit - 1:09.0643

Re: My Mr2 F20c conversion (Senor_2)

Tue, 28 Jan 2014 10:19:48 GMT

Nice, good to see the progress coming along with this swap

Re: My Mr2 F20c conversion (tcran)

Mon, 27 Jan 2014 21:38:04 GMT

Its been a while but since being on holidays I've had a little free time. Adapter plate is now fully done, also finished off welding the driveshaft mount that I have been working on for a while. Next in line is finishing off the engine mount, then it will be ready for plumbing!

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Re: My Mr2 F20c conversion (tcran)

Wed, 14 Aug 2013 19:13:47 GMT

Okay slow going with uni and work, but today I pulled the engine out (for the 10th time) after measuring up mounts, this is how I am planning on reinforcing where the front mount will be. What are peoples thoughts?

Its 2mm thick plate

Re: My Mr2 F20c conversion (B24)

Sun, 28 Jul 2013 21:18:23 GMT

You need a smaller master cylinder or larger slave cylinder.

Re: My Mr2 F20c conversion (tcran)

Sun, 28 Jul 2013 18:36:28 GMT

That would have been something to see! I'm running a exedy sports organic plate clutch with a e153 pressure plate for a bit of extra clamp. So its not aggressive at all... I bled the clutch today and tested it and it works!

The only thing is the bite point is at approximately 85% travel. How do you go about making it so its more like 50-60%? A longer slave cylinder rod?

Or are all mr2s like that?

Re: My Mr2 F20c conversion (sinbad)

Mon, 22 Jul 2013 09:39:20 GMT

tcran
I'll see how I go, I may weigh the car before I build the exhaust and everything just to see where I'm at.... It sounds like 1100kg may be reasonable as I'm sure my engine package will be lighter and E153's are pretty heavy I've heard. I'm running a S54, which are a lot weaker, but a fair bit lighter. I plan to run a carbon boot, engine lid and T-tops down the track, but I just want to get the thing on the road for now...

sounds good, my advice would be to run a mild clutch to keep the gearbox safe. after running a brass button clutch with my V6 and the original N/A gearbox, i literally blew my gearbox all over the road, i saw gearbox parts bouncing down the road in my rear view mirror! lol (hence the upgrade to E153)

Re: My Mr2 F20c conversion (tcran)

Sun, 21 Jul 2013 14:36:43 GMT

Just for interests sake, I noticed some people on facebook were arguing about the suitability of the S54 for the s2000. So I did up a spreadsheet:

Obviously the S54 has lower gear ratios and final gear than the S2000, this means that at a given speed less torque will be available at the rear wheels than for the s2000. However I will pick up a bit of fuel economy.

It will be interesting to see what the top speed is...

If I go forced induction down the track I think that the gearbox would be well suited.

Re: My Mr2 F20c conversion (kameleon)

Sat, 20 Jul 2013 20:27:36 GMT

I like your debating currency

Re: My Mr2 F20c conversion (B24)

Sat, 20 Jul 2013 19:27:34 GMT

Trav, its a good debate. The point of the brakes being my brakes are lighter than the stock brakes which is why I believe there is a weight reduction. If he leaves the stock brakes, it will be lighter as Ian has your brake kit.
The BC coilovers are lighter than stock, but Targa is a issue.
Look forward to the results. If it is under 1100kg you owe me a 'Bushmills'. If its over, its Johnny Walker.

Re: My Mr2 F20c conversion (kameleon)

Sat, 20 Jul 2013 18:58:58 GMT

I feel like a broken record if i make another comment on this one, but..

Targa
suspension weighs the same
Alloy brake calliper brake upgrade is not much heavier than stock

Doesn't add up to what you mention besides the wheels/tyre setup.

I look forward to seeing the progress of this car regardless and look forward to some 9,000rpm Youtube videos :)

Re: My Mr2 F20c conversion (B24)

Sat, 20 Jul 2013 17:31:17 GMT

Ian's car weigh's in at 1146kg with fuel,17/225+17/255 rims/tyres, kw coilovers(all steel),brake upgrades and some fair weight reductions(but all steel panels) and is street registered. It is a NA with the the s54 gearbox.
With the conversion, it will save 30kg. With the 15 or 16' rims and tyres with 235 tyres will also save close to 10kg. If its a hardtop, there is another 30kg to save so it is possible of a sub 1100kg SW20.
Will be keeping a close eye on the results of the conversion.

Re: My Mr2 F20c conversion (kameleon)

Sat, 20 Jul 2013 12:25:57 GMT

It is a road car not race car so i think it will hover around the 1150kg bracket which is still a good weight cut on a SW20.

Re: My Mr2 F20c conversion (B24)

Sat, 20 Jul 2013 09:35:44 GMT

I just checked the weights of the cars in the tech thread. I think you have a point Trav.
The AW and Spyder could do it, but the SW is a more difficult job.If I fitted that engine/gearbox package into mine, it would be 1000kg if not less. Mine was 1070kg with a full tank of juice and passenger seat fitted,all steel panels or bolts and full cds cage.
He could aim for 1050-1070kg without too much trouble. Really depends on how far he wants to go.

Re: My Mr2 F20c conversion (kameleon)

Fri, 19 Jul 2013 23:09:31 GMT

1000kg in a road car= dreaming