Matt 170's Supercharged S2000

[mattie170]

Cheers.

Gave the engine bay a steam clean yesterday. New overflow tank made for it aswell.

[Ben]

Lovely - looks mega.

[mattie170]

Cheers!

[mattie170]

Had a track evening at snetterton on Wednesday and the car ran pretty much perfectly. New rad is doing it's job, water was around the 90c the whole time. Oil reached 110c and gearbox hit 115c. In total I spent about 50mins on track. I have found the car needs a couple more upgrades like new LSD and maybe some stronger ARB's but they can come with time. Next Saturday I'm going the mlr sprint at lotus so will see what it's like at launching and keeping up with evo's. Should be fun.....to top it off I get to go out on the beers after lol.

[mattie170]

Been a while since a update, finally found a diff that would accept the quaife LSD, on a plus side it has a 3.58:1 final drive so means that car is geared for just over 200mph. Will be fitting it in the car this week.

Gary fitted some new cams to the car on Thursday but we ran out of time to map it before he went on holiday so we will do that when he gets back and see what the difference is. I do have a few sets of cams to try but hoping we get to see some gains with the first set so we don't have to mess about.

I have also agreed on purchasing a built bottom end, going to pick it up next weekend. It's still a 2.0l but been built to handle 1200hp. I will aim to run at around the 600hp so it's still responsive. Comp ratio is 10.5:1 on the new block compared to 11:1 on Oem engine so gives a little more room for timing and more boost.

Been doing bits and pieces to the car like altering the undertray slightly and moving the air filter to the engine bay with a cold air feed pipe. All needs finishing and powder coating.

[mattie170]

So been a lot happen since last year, original engine blew with the cams, company who supplied them paid out some money. Gary build my new engine up as I brought the rest of the parts I needed with the money. Engine is now a 9.5:1 comp ratio and is over bored slightly to 2044cc. I ran the engine in before Xmas then went for some bigger power and this is where some issues have arisen.

I want the car to be responsive so don't want a large turbo like gt35 but we have found with lots of testing the back pressure in the manifold is getting too high and causing the car to flatline from 7k onwards. This was at 1.6 bar but it still made between 460-500bhp by then. As I like things to be right i can't live with this and i can't live with a gt35. I now have a 1.06 turbine housing and the back pressures have dropped from 3.2-3.3 bar to 2.7bar. I hope this is enough to give me another 100bhp with more boost. Once my wheels are powder coated I will be going back to the dyno to find out.

I do have a backup plan if this doesn't work......I will compound charge the engine. I will run a tts rotrex supercharger and my turbo. As this type of supercharger builds boost as you go up in the revs the turbo will have to do less work at topping up the boost so the wastegate will be open more thus reducing the back pressure in the manifold. We had no issues of power dropping off when at 1.1 bar so I would plan to have the supercharger make 16psi at 9k then the turbo will only need to boost it up by 12psi to get to the 2 bar target boost. I will lose ac with the bottom mount tts kit but I believe I can run a toyota Prius electric ac compressor and just put a 12vdc to 200vac inverter in the car to power it, this means the compressor will always run at its optimal speed and I can move the compressor out of the engine bay.

I did think of a compound turbo set up with a gt28 and a gt40 turbo but it's the weight and heat that will cause issues. It would make more power but the supercharger is so simple to map and install.

The tts kit I am thinking about....http://www.tts-performance.co.uk/#!hond ... -diy/c11r8

Any other ideas are welcome!

[Stuart]

Having seen twin charged Evos decimate just about anything up the hill in Luxembourg, I have to say that supercharging with a turbo was simply devastating. Impressive plans mate. Good luck.

[Ben]

You project is mega fella - shame about the motor but awesome that your'e working up to the next stage.