Best turbo for a basic sprint car ?
 

Hi chaps
in need a of new turbo, 2002 wrx with all the usual bolt on’s Sti tmic, pinks ,pump , fully decatted , Harvey up pipe etc etc.
Was on a vf30 but I found this to laggy it punched well
at 3500/3600 but on the uk gearing 3,54FD it was always on the cusp.
So targets 330hp with similar FT, but key is it must spool around 3-3200max really. So what options are there ? I’ve searched loads but everyone just asks the same old questions what’s max hp/max boost il get from these. I’m not looking for those answers I know what power levels things run what I’m after Is what’s the best spool/ mid range and still produces around the 330hp mark as I think for sprinting this is a good number ?? And when my box does bite the bullet I’m going to lower the finally drive for the likes of a 4:11 from a Sti 5/6 just to have some more get up and go.
Any owners that used to run theses numbers back in the day ?

I have seen /spoken to couple turbo company’s and spoke a lot about doing a td04 19T with 11bade comp and port the housings right out. But looking at past threads some only really reach 300-310hp but looking at the dyno charts make some interesting power curves with FT and go crossing over nicely.

It seems the new turbos for sale all aim for higher power starting with Sc36 and its little more than needed and Andy Forrest made a great
point buy the smallest turbo that reaches your goal.
Vf35s are all cracked , journal bearing too.

so I’ve been thinking the likes off
The vf range vf23 - vf29 the 22 is to large.
vf34 , VF43 ,VF48 . Worried tho this range where all
designed to use avcs and the wrx has small
port heads so not flowing as near as an Sti will.
Can’t find any td05 16g front entry’s
or go for the 04 hybrid.

Many help / advice I’d be much appreciated,

I could also go Twin scroll too
i already have a twin scroll sump set up 3ports etc
I have got to have a map tweek and buy a blower itself.
So it’s only headers and down pipe . ?? Any one done the conversion?

VF42?

I am aiming for similar power eventually on my little track car, and I want similar spool too.

I'm going to try a td04HL-19t or 20t. Looking at the compressor maps, even the 18t should get you to that power (and it does on eg Volvos), but they run the td04HL turbine wheel, which has an inducer a couple of mm bigger than the td04L or H that we have on the OEM WRX.

The td04H turbine housing should be possible to bore our, or alternatively e.g kinugawa sell a housing AFAIK.

The td04HL-19t is also standard on some legacies, and I think they reach about 320 on standard turbo usually.


Having said that, a twin scroll might be nicer still :)

https://www.scoobynet.com/scoobynet-...onse-like.html

See this thread, it's got some interesting bits in it

Thank you Henrik for the information. The hybrid is a nice looking turbo when I was scrolling through there dyno graphs . Nothing even comes close to the FT they make so early. I had heard the import wrx newage’s got the the HL series too. Just feel the power out put would need be 320 if possible other wise it’s tailing of the faster parts of track.

bear in mind the later JDM Legacy 03> is a twin-scroll set-up also..........specifically different flanges to the Impreza though

I have used pretty much every turbo you have mentioned on my test mule 2004 blob road wagon. The only one yet to go is the TD04 19t conversion from ARD TUNING in the states. I have the kit sat here with the upgraded 11 blade turbine wheel too. http://www.ardideas.com/TD04-19T-Con...u-_p_2211.html

Of the standard turbos i like the vf24 which is on my car now, engine is standard with sti 5 cams, ported headers and uppipe from AS Performance. Do not underestimate header set up for spool and response though. I have a 550 bhp Sprint car with a bespoke header/uppipe with external gate from Area 52 Autosport. Turbo is a Garrett 30/76 in the standard position, this car spools incredibly well for the power, full boost before 3.5k in 4/5/6!

depends how serious you are as you are probably talking circa 1k for this header set up but believe me it works. The chap that works there has similar to mine with a TD05 16g making nearly 400bhp on V Power with incredible spool on an old classic with v3 heads.

Thank you for all the reply’s
i wonder what a td04 19T with a good bit of porting is like to a vf24/28, the td04 I believe is a very strong little unit, not sure if a gimmick but the likes of turbo Dynamics say they would fit motorsport 360d bearing to the 04 upon rebuild.

The car has stock headers and Harvey 44mm up pipe over the 42mm stock Sti variant,

mad hammer whats the reason for using sti 5 cams in the wrx motor ? Better flow ?
also have tried a VF43/48 as I believe there roller bearing so could spool like a vf34??

I wouldn’t use the 43 or 48 on 2.0 a 34 will spool better. A larger diameter uppipe is the wrong direction. If it’s a Harvey they are tapered so okay. I put sti5 cams in as I had them on the shelf when engine was rebuilt.

If just a turbo you want Enginetuner do a hybrid 19t that has made over 350. Drop them a line.

It’s a Haywood and Scott. I believe 42mm all the way through . Could explain why my vf30 billet wasn’t on full boost till 3500rpm ?
I think it’s looking very much like a td04 hybrid

Junk the H&S and put a standard one on

i would go 19t, the enginetuner one is the way to go. Speak to Alan Jeffrey, tell him Clive sent you.

What difference do sti 5 cams make mad hammer

On it fella !!!! Thank you for sound advice.

Stock Sti pipe purchased awaiting a call back on 04 build

specific Harvey Smith trick pipe would be the way to go...........

Personally as above I would speak to Alyn @ AS and get the correct harvey up-pipe to suit the hybrid TD04 turbo you're going for. There are different sizes of these and he will know which one will best suit the TD04 and improve spool even further than a standard up-pipe will offer.

For the minimal price it's a no-brainer really.

Impossible to tell as didn’t dyno back to back

There is that Alyn ;)