Hello from the other side of the pond!

Finally getting to a point of actually driving my never ending project. Finding lots of problems along the way and fixing them as I go. Built the car myself in the garage so has taken me close on 2 years on and off.

Its going for a tune on 21st Nov here in the UK. After speaking to the mapper, he said the limiting factor to the build is the stock compression ratio due to knock and our fuel available. We have 98RON here (Shell V-Power) which I believe is the same as your 93OCT.

My setup is;

Stock F20C, BC dual springs and Ti retainers, ARP headstuds, OEM headgasket, Facelift(AP2) oil banjo bolts.
BorgWarner s366 twin scroll (billet comp wheel), Schmuck built manifold/intercooler/piping, Full Blown inlet manifold, Skunk2 74mm TB, ID1000s, Bosch 044 inline pump, AN-6 Feed and return, AEM fuel rail & FPR, 3.5" full exhaust system.
All AEM elecctronic wizardry (fuel, oil T&Px sensors), Infinity 506 ecu with SOS wiring harness.
Ford 9 inch solid rear axle conversion with 4 link and pan hard bar.

Realistically what power should I look to see on the dyno? It sucks as we cant get e85 here so the fuel is going to be the limiting factor I guess? I've been told to aim for around 20psi of boost but would my fuel system support this? ID website "duty cycle graph" says I should be able to support it.

Sorry if this has been asked many many times, but over here a turbo'd S isn't very popular so information is limited!

Kind regards.

 

On the safe side of things, I'd bank on around 450-475 whp. If you could get ahold of some e85 (you can ship some in from various fuel shops), you could go as high as 800 whp if you upgraded your fuel system.

 

Thanks for the reply bud,

I thought around that figure, was hoping for around 500ish tbh so not too far off.

I have a friend with a fully built F20 who has his car in pieces at the moment, so maybe worth asking him if I could borrow his ID1300's to up the fuel supply and stop the duty cycle maxing out on the 1000's then I'd have to upgrade the injectors in due course.

*Side question, I've set the fuel "base pressure" at 50psi, but when I did this the engine was off with the fuel pump set to ON constantly. Starting the engine it pulls 10vac so fuel pressure drops to 40psi at idle. I have the AEM rail and rail mounted FPR (1:1), is this reading correct or should it be set with the engine running and everything connected so its reading 50 at idle (60 with engine off).

 

^^ditto. im betting you'll be in the 420-450whp range. 93oct is fine for ~450whp level. e85 would be nice, but having to upgrade your "just built" fuel assembly and having to import the fuel, it'll be highly impractical. reading your list, you have a very capable build for more power. If you upgrade your injectors, you can probably get 500whp+ with a good tune on 93oct. basically ask the tuner to max out the injectors up until the motor starts to knock. congrats on the build and cant wait to see the results! good luck!

 

Yeah that's the biggest issue. The fuel here isn't that good and as you say its impractical importing E85. My fuel cell is enough hassle as it is without worrying about running out of non existent fuel over here haha. So you reckon the ID1000 duty cycle maxing out will be the limiting factor to making decent power (basically the bottleneck in the build)? Annoying when the injectors have done next to no miles and they were brand new. Should have just put the extra and purchased the ID1300 in the first place haha! DOH!

 

I know, its always easy to point out things you couldve done differently in hindsight but my advice would be to run what you got. Youre gonna make plenty of power as it is. Enjoy it then upgrade later when you feel you need to

 

Very true. I'd love a fully built engine but the s2000 specialists are over there in the USA which is a logistics nightmare! I think your right... I'll just get used to the setup I have now then when I come to go all out I know what I need.

In regards to the fuel pressure question... this is exactly how I set mine now I think about it (not with engine off)... set at 50 psi with vac line off and my thumb blocking hose, so maybe the extra fuel pressure may help yeild a bit more power.

 

The 93 octane fuel will be your limiting factor IMO. Your ID1000's will get you beyond the 450-475 whp mark on gas with a higher octane but again, I think the fuel will limit you before anything else. Keep us posted on how it turns out.

 

Correct me if I'm wrong but I thought 14psi - 15psi was the limit on 98ron on a stock F20?

 

You could always add meth injection to bump up those numbers to over 500whp.