Hybrid Garrett GT35 VF Turbo P20
 

Thinking of getting one of these for a 04 STI

Mods i have,
RCMS manifold, RCMS Full 3"decat including uppipe,
Monster Hyperflow FMIC,
Uprated fuel pump,
650 cc Injectors'
Fuellab Regulater,
Standard internals.
Will be remapped with simteck.

Would this be a good set up or to much to laggy etc, any info or advice appreciated.

Thanks Rob
,

get the p18,wont be as much lag and you can still get over 400bhp, give rcm a call

Agree with above if on a 2.0L .... P18 will spool quicker. P20 on a 2.5.

Get your internals done other wise you're wasting your money.
If you don't you won't be able to run one of these to its full potential thus wasting your money.

Or you'll up the boost blow your engine up and take your brand new shiney turbo with it. Thus wasting your money.

I've been there an done that!!!!

Build a solid engine (its cheaper than you think) then go for power.

totally agree

Thanks for the replies was planning to take it to 400 bhp led to believe standard internals are good for, owned this car from new its low milage want to get the most from it, then i'll get a forged build, trying to future proof dont want to have to keep upgrading, i know what your saying is the sensible way to go forged first but ive had this car for 4 1/2 years and want more power now cant afford to do everything at once, im so impatient, if i go with the P18would it be a good set up.

Thanks Rob.

Dresser

How about just lowering your expectations a bit and keeping it just below the 400 BHP limit which your motor should be able to cope with :)

I run a Deadbolt TD05 18G (a bit old school I know) with a few mods and an EcuTeK remap but when I stamp on the loud pedal it's a bit of a beast.... Overwhelmed the Eibach suspension LOL

Shaun

Don't say I didn't warn you lol.

I guarantee you'll not have the discipline to keep the boost down if you do the turbo first method.

Just be mindful if you're engine goes it will take the turbo with it.
All the fragments from the engine will be forced through the turbo blades and your brand new turbo is scrap and you'll probably have to source a new block too.

My honest advice is to drop some rods and pistons in your engine first.
If you know what your doing you could build yourself a forged engine for the cost of the turbo.

Totally disagree..
I have 4 of these all producing 430-460bhp on the stock internals , 2 on pump fuel and 2 on a meth mix..
3 of them have now covered 12,000 miles or more on this spec without a day of trouble..
The 04 STi engine is very capable with the right bolt on bits...
From memory Tracktive Solutions and GRD have both ran 500bhp+ on the stock engine without issue too...

Ok then let me rephrase this. It's doable. However if I was a tuning company it's not something i'd be advising my customers to do. Unless of course you want the work when (not if) they do go bang.

I'd rather run an engine that I KNOW is up to it. Not one that maybe upto it.

Tracktive and GRD et al can afford to granade the engine's on their demo cars but taking these risks on customer's cars or advising them to do so is pretty sh*te if you ask me.

The customers Martyn is speaking of were not advised into these modifications, they were requested.

There are a fair few 04STi now with excess of 400bhp and all running well.

Any engine could go bang at anytime, who is to say even an aftermarket forged build will be bulletproof?

Rob, can I suggest giving MartynJ a bell about the MD195 or MD555 series of turbos.

I'm not saying a forged engine is bullet proof but they are far stronger than OEM stuff.

Whether they requested or not isn't the point. I'm disagreeing with a tuning company saying that its fine to run near 500bhp on a standard engine. It isn't plain and simple. What he should be saying is yes it can be done and has been done but it's safer to build a stronger engine first.

Or if an engine build is totally out of the question then stick with power levels that are known to work with longevity. On a standard engine I would suggest that this is no more than 400bhp.

Don't get me wrong, I've driven a standard unmapped engine way past that (452bhp) but I made the decision that the engine was expendible.

At the end of the day its up to the owner of the car but in my eyes they should be informed of the risks and at 450+bhp a standard engine is definatly at risk of sh*tting itself!!

Ok spoke to RCM, they have a RCM 400 rated at 400-420 not on there web site yet, anybody got one,trying to find any info on them, and Daz your probably right i would turn it up.
Thanks i'll give Martynj a ring still looking for options.

Rob.

If you want 400 on a 2 ltr, how about the MD321H?

Generally, it's advisable to run the smallest turbo capable of meeting your power demands a) to improve response, boost threshold etc.. b) to avoid the situation Daz describes! :)

Ns04

I have the RCM hybrid turbo complete with P20 ported shroud on a 2 litre. 440bhp/ 370 ft lbs/ take off is about 3600rpm. Forged/lightweight internals

he was asking about the garratt vf 35hybrid, have you done back to back comparisons? just curious

Nope, jumping on the MD321H bandwagon here, I'm afraid! ;) :D

Was under the impression that the hybrid with the p20 housing was capable of quite a bit more than that?

Ns04

there is a wr1 with 487 bhp,still a 2.0 built by rcm:)

meant to say - mine is on a classic (P1) so decent power to weight ratio and long gear runs

P20 good for up to 480bhp at 2.1 bar

Not on standard internals though!!

i have the p18 on my 02 wrx ( std internal) and have never had a problem runing just shy of 390 bhp

I will be moving to a p20 housing with my new rcm built 2.5

It doesn't cost a fortune to change the housing which ever one you go for, talk to Olly as he will point you in the right direction

Rich

My point exactly, sub 400 is ok :)

I also presume the RCM 2.5 will have steel rods and forged pistons?

is rcm doing a 2.5?

yup, on my setup I get 1 bar of boost at around 3k8 rpm - I wouldn't want any more on a car used mainly on the road


fat boy

could yuou let me know the spec of yours as it sounds very simular to mine

Rich

they will build a spec to what you want to use the car for

I wanted a fast road car that will see little to no track work - they have recommend with my budget to go for a 2.5

Rich

I don't take any risks that the customer isn't willing to take with me Daz..
My opinion has always been the same , there is an element of risk involved in ANY performance tuning..
Those not prepared to take that risk shouldn't be modifying their cars at all...

I am confident in the package we offer as we have had no issues from the first to the last , add to this that we aren't the only tuner offering this level from stock Newage Sti engines..

I think if you made enquiries you would find plenty of cars running a package similar to this all without issue , their choice of turbo may be different but the theory will be the same..
Good quality front mount , good quality injectors , a tried and trusted turbo and a remap or replacement ecu and map...

In my experience a P20 housing on a 2 litre is going to be lardy.
I do have experience of several New Age cars on standard internals with 400 bhp without any difficulty so far but I wouldn't want to go much beyond that long term unless I was ready with a replacement engine. 400 bhp on the New Age is OK but for someone that drives hard and treats their car hard it won't last IMHO but the boundaries are moving forward all the time.

Thanks for all your input, im going to go for the RCMS 400 and get it mapped to suit, all i need now is a 3 port boost controller,anybody know where i can get one.

Rob.

Martyn I need to clarify. I wasn't having a go at you. I was just disagreeing with the stock engine will be fine at close to 500bhp arguement.

I think you'll agree that this is taking a stock engine very close to its limits if not beyond them.
I think you as a tuning company have a duty to make your customers aware of that. It sounds like you're doing that and they are willing to take the risks.

Surely though you should be advocating building a strong engine first then go for big power. Not go for big power, your engine "should" be ok.

I just wanted to clear that up as I re read my posts and they seemed like an attack on you which they weren't :)

S'ok Daz , I am quite thick skinned...lol
I agree that at the high end of 400bhp you alsmost certainly should build the engine or at least be willing to accept that it may break..
At the low end though it really doesn't seem to be an issue..
Not heard of one breaking yet from any of the tuners of note at this level..

We could as tuners say that with any power hike from stock you should rebuild the engine , but then we would be seen as ripping people off when their standard engine will do the job perfectly adequately..