tom-r33

iTrader: (2)

I'm building a rally car which has to run a 34mm inlet restrictor. I have 2 turbos in my possesion which would be suitable but I cant make my mind up between running the vf23 or the td05 (16g I think, off a v2 sti)
What would you choose and why?
Engine spec is basically standard sti v3 with harvey up pipe, ported headers, front mount intercooler and lightweight flywheel and pulleys

wms-racing

VF23 will work better as its smaller and will spool well with the restricor, vf 34 is pretty much the std most use with a restrictor. If your running vpower the best ive seen is 280bhp, well within the vf23's capacity. If your running Carless 102, the best engine ive done is 332bhp on a vf34.

AS Performance

iTrader: (4)

if you have the budget convert to twin scroll.................

Adma-RA

iTrader: (1)

wms-racing - what (in your opinion) is the best real-world solution on a 34mm? By real world I mean something that isn't serious money to replace and/or is fairly reliable when run with ALS and DV-less.

I've not got a manifold to start with so it makes no real odds wether it's single or twin scroll, but was looking to use an MD321 for sprint work so have a slight single preference.

tom-r33

iTrader: (2)

Thanks for the response WMS.
I assume the 330+bhp was achieved using a stroker motor and had some 'trick mods'?
Which twin scroll would you recommend? How much earlier would it produce boost?
I have read you need to run a different sump with a twin scroll manifold, is this correct?
Tom

white noise

iTrader: (8)

If you need any restrictors made or bits for rally car
i work as a cnc machinist and could make the odd thing for you

Made these before out of ally, can email pictures to show you them

Neil

wms-racing

Most are runniing VF34's, spool well, make good power and easy to get hold of. I tried a twin scroll setup with a vf37, but switched to the Vf34 as Graham Martin has had some billet wheels made so we wanted to test that with the 34. I believe the VF36 (twin scroll) is very good but havn't tried one my self.

wms-racing

My car and the 332 engine are virtually the same spec, both 2.0 as you have to run a 32mm restictor if you are over 2,000cc to be legal!!
They are both 10:1cr with ported heads, group A/wrc cams, my headers and rotated vf'34's. The 332 engine has supertech valves and has +10bhp and +25ftlbs over my engine :-( need to go shopping ;-)
Yes the twin scroll needs a differnt sump.
I'm not sure how much the twin scroll improves spool over a 34?

tom-r33

iTrader: (2)

Awesome, thanks for the offer. Can you replicate the TEG 34mm restrictor? Which I believe is the.best out there?

tom-r33

iTrader: (2)

Ok! I have a stroker I was seriously tempted to use, but a 32mm on a 2.1 would be rubbish!
What sort of money we looking at to build one of those engines? I need one! But don't want to spend too much, I already have alot of parts from a broken v3/4 sti, worked heads, cams, crank, pistons, rods, ACL bearings etc... PM me so we can discuss in detail
Cheers

Henrik

iTrader: (5)

If the restrictor limits power to 280ish, can you not fit a td04 and get decent spool as well as a cheap turbo?

wms-racing

It's expensive to build to this spec, CDB, 14mm studs, special pistons to get CR up, cams, porting etc. Cost from me would be in the region of £7500.
The single biggest thing you could do to get good power would be to run it on Carless turbo ultimate, it's £4 a ltr though.

tom-r33

iTrader: (2)

7.5k! Urgh! I'm hoping to build my whole car for less than that!
I think I will just go with a fairly standard but fresh sti motor with forged pistons, like I said I have most of the parts required, and think my money would be better spent on a turbo rather than cams, studs, porting etc
Do you guys build engines using used parts like cranks and rods?
I thought the rules stipulated 'pump fuel' had to be used? And from that I assumed that was fuel that was readily available from any pump, i.e. v-power, momentum etc etc?! How is a 102 Ron fuel allowed? I have some 119 that needs using, can I run the car on that?!

white noise

iTrader: (8)

pm sent

AS Performance

iTrader: (4)

MSA rules allow a max of 102RON fuel.................

as for the turbo then the twin scroll with suitable matching headers/sump will outperform a single by a decent margin (everything else being equal) - every grpN car from 2003> has been to this spec

tom-r33

iTrader: (2)

Ah thanks, I must be getting confused with my last competition car rules!

Which twin scroll turbo and manifold would you recommend for my application?

Cheers

tom-r33

iTrader: (2)

Ah thanks, I must be getting confused with my last competition car rules!

Which twin scroll turbo and manifold would you recommend for my application?

Cheers