My 2.5l forged build will be ready soon, although it will be a month or two longer before it is a) run-in and ready for mapping and b) more importantly, the new twinscroll turbo I'll be using is ready to be fitted.

I have been stubbornly planning to stick with a TMIC (car is '05 JDM STi) as I know several people (Andy Forrest for one) successfully run 450bhp through an STi TMIC but, not surprisingly, many folk are saying I'm mad to even consider it. My aim is 450/450 although the build is good for 500+.

So, am I being stupid to even consider sticking with the TMIC? Will it really be as bad as people suggest and severely limit power?

Opinions welcomed!

 

"power" can be overated. IHMO a car with a TMIC will be quicker than a car with a FMIC (all other mods being the same).

I would want to stay with TMIC for as long as possible personally and I would recommend speaking to your mapper about your requirements. The TMIC may be on it's limit at 450 though.

Have you already chosen a mapper?

 

check this thread out mate - i started it ages ago, lot of good posts on the subject

https://www.scoobynet.com/general-te...-bhp-tmic.html

 

Simon/JGM

 

Hi Tim. I'm running a TMIC at 415bhp and a MD321H on a 2L at 1.7 bar boost and have absolutely no issues whatsoever. Lightening quick throttle response for me is worth any top end power losses under hard sustained throttle (eg track work). A bigger turbo running a bit less boost on a 2.5 should make 450bhp on a TMIC comfortably. I'm going for a built engine and bigger turbo eventually and I fully intend to stay with the TMIC

 

A good read - thanks. Should have used search I guess

 

Have to agree that was a good read, so fmic seems to be the best idea but what would be nice to know is

Would it be an idea to reverse the inlet at the same time or is this very costly and not worth the time

 

Stevie it is not worth the hassle as the gains are very minimal at best but does look nice

Banny

 

Ok cool cheers banny will just get the fmic then

 

Be intresting to hear other peoples response on this, as we recently fitted a FMIC to my brothers STi and to be honest I dont like the way it drives now, the car used to spool up really quick, but now it seems to laggy. o.k its not running big bhp as he is still running the standard turbo, but it seems to have ruined what I thought was a very nice road car.

 

has it been mapped for the fmic though?

Simon

 

Thought about water injection? I could only get a small intercooler on my Fiat Coupe a few years ago and fitted water injection to get the temps down in the summer. It took a fair bit of experimenting but worked really well in the end, also used a water / methanol mix so it gave the fuel a bit of a boost, good safety features as well so that if the WI failed the ECU would trip back to a standard map.