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Your car is looking fantastic. Really. I can't fault anything about it really (apart from the turbo, but thats your choice). Fantastic. I love seeing cars like this done by people with real talent.
Great pics too, your are really quite the photographer. I nabbed one for my background.
hey valver just outa curiosity why didnt u go a ball bearing model turbo like something in the gt range?
Good question I bought a couple of different turbos for the car, but ended up with the T3/T4 S3 .48, as I looked at lots of dyno graphs and it had more mid range than anything else (bar the GT30, but that would have made too much power). It will spool up a few hundred RPM later than a GT28RS, but I have one of those too for hill climbs etc (mind you, I need an adapter for the manifold to put it back on) I really wanted a Porsche K24, but I couldn't find a manifold I liked to suit one... they were all big tubular units and I wanted a stubby one.
The car makes far more power than I wanted, so I'll probably end up going to a smaller unit for anyway-for a while it'll be good fun, though!
1976 Project Carbon Mk1 - Sold! | 2015 Lotus Exige Cup | F80 M3 Family Wheels
That is a hell of a lot of power in a small car! It should be a lot of fun, until you see the the tyre bills haha.
I wonder if you could get the power to come on earlier by changing the cam to cam timing? Either way you will definitely get power by 3000rpm with the gt28rs, probably earlier on a 2l.
Anyway the car looks great, good luck with the last few hurdles.
With a .86 housing . Boost doesnt come on till 4500 with the .64 housing it was coming on around 3500 .
I'm using the turbo one size down from that http://www.turbobygarrett.com/turbob...S_739548_1.htm
The disco potato (such a ridiculous nickname!) gt28rs. Boost comes on at 3000rpm but thats on a 1.8l 16v. On a 2l like this ABF it should spool up a fraction earlier I'd imagine.
With a .86 housing . Boost doesnt come on till 4500 with the .64 housing it was coming on around 3500 .
I'm assuming that's on your S3, though, which has the benefits of AWD and 700 more kg, so that turbo is way off what I'd want in a flimsy 700kg Mk1!!
I've already over-specced the engine, as we designed the car for around 300hp... so there are some issues to now address:
- Gearing is too short (3.94 FD from 3.67), though it does now have a Gemini LSD. I can reinstall the 3.67, but what a PITA job!
- 195 section front tyres (!!)
- Rear springs, especially, are too soft, and I don't want to change them, as I'll be changing the suspension soon
- I need to lose the side engine mounts and use cups (much like is done for Mk1 VR6 swaps), as they can't take the torque... I should have done this earlier, but admit to cutting corners on this one!
- Cooling is another big issue, and front space is very limited. A lot of the US Mk1s run the Spearco water cooled IC's, but I'm not so taken by the idea. The other option is to convert to a semi-space frame front end, but this is out my league
- I also have the smaller wheels to go on the car, which is only going to create more problems. I'm now looking at going to 16s when the car is used on the track...
There are loads more things to look at, and I don't see the car being finished properly until the middle of next year Cheers
1976 Project Carbon Mk1 - Sold! | 2015 Lotus Exige Cup | F80 M3 Family Wheels
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