Only 403bhp on md321t
 

Hi, I need some help in reaching 450bhp on my 04 sti wr1. I've been mapped and dyno at 403bhp at 1.6bar of boost using a MD321T billet turbo with all the supporting mods:

Rcm headers
750cc injectors
Fuel lab fpr
Perrin intake
Rcm turbo back exhaust
Japsppeed fmic
Remap jgm

Do I need to run more boost pressure? Any help would be appreciated

I ran 1.8 on md321t on 55plate sti made 431bhp

Thanks for the reply, was this on standard ecu on v-power?

Standard ecu but with apexi avcr wired it to get the 1.8bar and v-power
650 injectors
Hdi fmic
Fuel pressure regulator
Was really laggy on my 2.0l

got a 3port on it?

Yeah mine needs to be around 4500rpm before she takes off. Does fitting the avcr get round a problem to do with the stock map sensor?

Yeah it has 3-port solenoid

Avcr has a 3 port solenoid and different map sensor

Is the standard ecu boost not 1.65bar max without avcr

I'm not sure, I think I'm might be at my boost limit?

im on the factory map sensor btw

Even with avcr you will struggle to get 450bhp out the md321t on 2.0l im sure theres a thread here about not getting 450 out 2.0l

thanks I'll search for that thread, I'm still 30hp behind you, might see if I can get the boost raised
https://cimg6.ibsrv.net/gimg/www.sco...2c706e0d4.jpeg


My graph

What torque did it make

375

Mine was 385 no much in that then

When I had my 321t mapped Andy F recommended to stay on standard ported headers, mine made 412lbft, and 409bhp, have bought a decat downpipe now so hoping for more.

Have you checked for an exhaust leak?

I have checked for any leaks and seems to be ok, does it look laggy to you?

max it can see

Does seem not many have hit 450 on a 2.0l using v-power

More suited to a 2.5 tbh I think that's where the numbers seem to hit. Hence the lag and needing more boost to get there

are there any better turbo options to make the 450bhp more easy

From a guy who chased 450bhp on my last two cars why do you want 450bhp instead of say 420bhp from say sc42

And i still never got the 450 and sold both cars

I guess because I've got a 450bhp turbo fitted and I'm making 47bhp less than what it should. I believe it will feel a lot more aggressive with an extra 47bhp.

If they only make around 420 then I might as well fit a smaller 400bhp turbo and have less lag.

If your car was 2.5 you would have the 450bhp

Sc42 will hit 450 with 1.8ish bar and a splash of meth I reckon 470 is achievable.
420 is only a guide but they tend to go more depending on set up.
It's what I'm going to use.

So the md321t billet is a turbo best suited to a 2.5litre, suppose I'll just have to make do till a more fruitier turbo is released

What about the sc46 is that the md321t equal?

Nah sc46 is more 500+hp turbo IMO (with right spec and meth) slightly laggier than the 42 but still a good unit and will make the 450 easily on pump fuel