I'm aiming for 400bhp for the beginning of next year, but think I should get something oversized like for 450bhp to give me a bit of leaway.

But, as I know very little......what should I go for? A mate who use to have a 400bhp 200sx said a 2871r, but dont know if these fit impreza's etc?

Just asking as if something comes up on here or ebay I might as well buy it to be ready.

Cheers

Chris

 

tdo5 20G from andy forest for 400 or the md series for 400+ mate oh and a forged engine to keep it all in one piece plus the list of other things to support it all .

 

hehe, yeah I've realised I will need more than just a turbo

Just didnt know which turbo to look out for.

Would it be wise to go for a td05 20g if I want 400bhp....as thats on the limit isnt it?

 

Actually though......forged engine for 400bhp?

 

2l or 2.5?

 

2003 STI 2l

 

The MD 321T is a great turbo Awesome for early spool-up

Also owen developments do some good turbos.

Dannytwo

 

i was going to go for 400 but due to the cost of the 20G im not now tbh , ifyou just want 400 the 20g will be fine but if you want more in the future an md would be better as they produce more power . As for the forged engine i would say is a must on an md as they poduce alot of boost low down and your bottom end needs to be able to take it and i dont know how it would last with out it mate .

 

the 2003 sti will be capable of 400bhp without a forged built motor.

my 2004 sti is running at about 450bhp on standard internals.

Give Martyn or Alan a ring at www.enginetuner.co.uk to discuss options.

 

The MD321T will give you the power you want but i can not agree on early spool up, not on a 2ltr any way

Look at my scooby i have one.

Getting my simtek fitted this week so will let you know the out come as im running ecutek at the mo and its not very good

 

Look at the MD555 series.

 

maybe on a 2.L i keep working off my 2.5.
I will soon be having the simtek fitted,surpose to be a very good ecu.

 

Cheers for the help and advice guys. Will have to have a think. Might not get a MD321T if the spool up isnt too good on the 2L.

 

the spool will be very little different to what the 20g is

 

Oh right.....thanks. May well consider it then!!

 

A few points.

If you want 450bhp, then I'm not aware of a quicker spooling 450bhp bolt on turbo, than the MD321T. This applies regardless of engine size.

I would generally recommend the MD321H on a 2.0lt, but if you have a new age STi with VVT heads, a turbo will spool up circa 3-500rpm earlier than on non VVT heads, and the T becomes a very good option, especially since the later STi engines seem to be able to take a lot more power too.


Mark.

 

I'm aiming for 400bhp, but know I would soon want more, so a MD might be the path to take.

Whats the difference between the H and T?

 

So, if you weren't necessarily bothered about chasing after maximum bhp potential, then you could stick with the 'H' and have an even earlier, super-spooling motor on the VVT heads?

 

when does yours spool up?

 

from who?

 

Turbo Dynamics.
http://www.turbodynamics.co.uk/downl...baru_turbo.pdf

 

Not to sure when it starts but i do not get full boost till 4k revs in any gear.

Maybe the simtek will help with this ill find out when it gets fitted in the week

One thing though.... When it dose kick in you know about it

 

I think a better way to think about it, is what sort of driving do you do mostly (Motorways, A or B-roads) and how do you drive your car?
In other words, do you want a turbo that spools early, has good throttle response and gives good power and torque right through most of the rev range (very well suited to fast B and twisty A-roads ... the MD321H would definitely be my choice on the stock 2.0l engine and should make around 400bhp).
If you do mostly motorway driving or more straight A-roads, or you plan to spend the money on a forged or higher capacity engine in future then the MD321T would be a good choice IMO and get you to your 450bhp. You will obviously need to drive it slightly differently to get the most out of it, keeping the revs up higher and I suspect the throttle response would not be as sharp, but it should still be good.

It all depends what you want from your car?

 

A 321H on a 2.1 from EngineTuner (?) is where I'm heading ! Probably...

DunxC

 

Thanks STI freak.

My driving is 90% on twisty roads due to where I live. Would the H easily get 400 or would that be pushing it?

Cheers

 

What made you go for that one Dunx, just reading up on it and advice etc?

 

Have a look here to get some idea https://www.scoobynet.com/general-te...re-please.html ... but I also suggest having a chat to some of the mappers, like Bob Rawle, AndyF, Zen or JGM who will give you a good idea on what you could expect from your setup.

 

Re TD05-06 20G. A word of caution. A lot of the 20Gs on sale at present struggle to get to 380 bhp and ARE NOT 400 bhp turbos.One was sent to us from Scotland last Wednesday, fitted to the clients car on Thursday along with 550cc injectors. The car has a Hyperflow FMIC. It was mapped on Dyno Dynamics rollers on Friday @369 bhp even though it had the supporting mods. This is not untypical of many of the current off the shelf 20Gs.
On Friday, Darren fitted a different 20G, not a hand built, to his P1 and that is mapping this Wednesday coming. This car has all supporting mods and on past experience we are hoping for 380+ bhp if the turbo is up to it. The same car already has 351 bhp on a P Zero VF28 that nobody rated previously.
I'll post thee results.

 

Cheers for that harvey!

Also, thanks for the link STiFreak. Looking at the thread....it seems the 321H owners dont ever get above or too near 400bhp though really...?

 

Quite a few of them are in the 390's with supporting mods ... which are going to be pretty rapid. Give Mark @ Lateral Performance a call and ask him about the 321M ... which I think is in between the H and the T.

My advice is don't rush your decision. You might want to see if any of the people running these turbos are in your area and see if they would be kind enough to take you for a drive, so you can get an idea of what that sort of power feels like. Be careful of chasing numbers for numbers sake ... concentrate on drivability, response, etc and you should end up with a car you really enjoy driving in all conditions.

Best of luck