annointed

MRT cautions not to run over 16.5 psi on stock internals, saying the boost pressure will eventually blow the engine unless one upgrades the internals. I have a '94 WRX wagon driveline swapped into a '94 Impreza saloon. To those with a comparable set-up, how much boost are you running, and how long have you been running those levels?

Thanks. If you care to see my mods before commenting: http://www.subarureview.com/bio.php?name=annointed

UkLegacyT

assuming its just the wrx and not the wrx sti, then i believe the internals are the same as the uk models.
if so, i run just over 20psi

cheers, ian

annointed

How long have you been running that boost? What year is your car?

Yes, mine is a "plain-jane" WRX

Katana

Why do I have this terrible feeling that you've blown a few pistons before if its an early car?

If I'm not mistaken, an MY 94 run the same boost as an MY93 which is around 0.7 BHp if its standard.

[Edited by Katana - 5/18/2002 9:14:32 PM]

UkLegacyT

been running 17/18psi for about 5/6months just after i bought it, then upped it to 20/21 (is 1.4bar) about a month or so ago. car is 1996, but the engine is still the same as those used in 1994 etc

katana, surely your car is slow with 0.7 'BHP'

annointed

I've read that my jdm '94 WRX ran 11.7 psi from the factory. I've never personally blown internals, but I've also never run over 16 psi, due to MRT's cautions. In 2003 I'm seriously considering a stroker kit with uprated internals, so I can run 24 psi all day long For now, I'm just seeing how many testimonies people will post about blown engines running 18-20 psi, etc. Or if a ton of people will say they run 20 psi all day long and never had a problem...MRT obviously knows what they're talking about, but it's still fun to see who's stretching the limits.

Katana

Eek!! I meant Bar. You know what the scary thing is? I'm more than likely going to be working on commercial aeroplanes. Imagine me mixing up pressure with power on a 747.

annointed

Ian, are you running stock TMIC and injectors as well? And, your car has a TD05-16G, correct?

[Edited by annointed - 5/18/2002 9:30:03 PM]

UkLegacyT

i dont doubt for one minute that MRT know what they are talking about, because their reputation is v.good.
im just in the category of 'having some fun', as being a student, cannot afford the uprated internals

UkLegacyT

it is the stock cooler, but it is a top mount charge cooler on my car, with the rad down at the front.
injectors are stock.
dont know what the turbo is, some kind of vf series. is smaller than the tdo5, as im fitting one of those in two weeks when i have time. noticed on your car spec that your tdo5 is ported, i take it that is smoothing the turbine house entries etc ?

oh, katana, if you do work on commercial aircraft, you better not get your figures mixed up, as ill hopefully be flying that type of thing within the next few years!

Katana

UkLegacyT, between you're flying and my engineering capabilities (or lack off), I don't think we inspire much confidence to the passengers don't you think?

Oh, don't get me wrong, I might also be flying them things myself. Its around $29,000 USD to train for an ATPL right? Might take the course once I've finished my engineering degree. I think I'll mod them jets with HKS and Blitz products. Perhaps I can even improve their 1/4 mile performance.



[Edited by Katana - 5/18/2002 9:44:36 PM]

annointed

Ian, I'd love to know what VF turbo you have on the car, and how it compares to the TD05 when you fit it! Does your car have the 90 degree elbow? I'd assume it does. I was told that it would take extensive modifications to make a VF series ball-bearing turbo bolt up, and that I may as well save a bundle and stick with the TD05.

My turbo is ported on the exhaust side. It makes adds a small amount of top end, and causes the turbo to spool a little earlier(100-200 RPM's at best). It's not a major mod, but its relatively cheap, and in the world of hooking up cars, ya takes what ya can, especially inexpensive, safe mods.

john banks

Many Phase II (MY99/00) UK cars on big turbos on standard internals run about 19-20 PSI, some long term. I have been running over 18 on the original TD04L for several months, and now run a hybrid at 20 PSI. It is more the clutch and gearbox that worry me.

UkLegacyT

hi guys, im back now.

agree with you there john, forgot to mention that one.
my standard clutch slipped like mad, so fitted an AP kit. then 2nd gear stripped in the standard box, so fitted STi RA box and diffs, so take care !
i dont actually know what vf it is, i was just told that its a vf11 or something, but havent looked to be honest. (never heard of a vf11 either!).
it has the 90degree elbow, but thats going...
katana, ATPL is £47500 english pounds mate
i finish my aero eng degree in less than two weeks mate..cant wait!

john, your doing a good job of that car mate, looked at the tdo4 hybrid topic you posted
have you ever tried a TDo5 on yours? im guessing not, due to the age of your car....

cheers

UkLegacyT

john, is your clutch the standard one?

Katana

Unless of course, you train in the US. You can train for a UK ATPL there for a fraction of the price.

I've got it all planed out once I've graduated from Uni. I'm either doing that or take a year out doing nothing.

annointed

C'mon over, fellas!

john banks

Yes standard clutch. For how long I don't know.

UkLegacyT

lucky sod
mine went about 16 psi

Cosie Convert

I must be soooooooo lucky ? Std clutch holding 26 psi nicely on the road !!! Had to drop a few PSI on the rolling road though as it started sliping due to the lower rpm increase rate.

PS - Std internals

[Edited by Cosie Convert - 5/19/2002 12:38:12 AM]

annointed

Cosie, it is worth noting that you are running an RA...was it a '95, IIRC?

Cosie Convert

Yes It's a 95 RA. Maybe they had different clutches ?

GavinP

Cosie is also running WI and an uprated fuel pump!

Thanks

Gavin

annointed

What is WI?

Cosie, are you running greater than 3 bar differential through your injectors to do 26 psi? 26 psi must be fun!

GavinP

Sorry, WI = Water Injection

Thanks

Gavin

Cosie Convert

I am running 5 bar fuel pressure at max RPM max boost. This is 3.2 bar across the injectors. I find that this higher diff eliminates the weak flat spot when off boost. It is slightly rich coming on boost (9%+) but it is only transient.
I also add methanol to my water injection so this adds fuel too.

Andy