john banks

Trout what have you done to your fuel pressure if anything? How are your injectors?

R19KET

John,

Trout is a little on the optomistic side, feeling that he would be requiring 740cc injectors

To be honest, if you take away what he's "actually" using, there's enough over to run your car too

Mark.

paulwadams_my99

Cheers Mark,

here is a quote i have found saying something similar to yourself. Thought id put it in just for anyone elses interest.

"Many people will tell you the power is made by using a larger compressor wheel. In reality a larger less restrictive exhaust housing and turbine shaft will yield larger gains. We found that the larger the exhaust housing the greater power is gained because of less restriction.

The larger exhaust housing does have its trade offs, most of the power now moves up higher in the rpm range. Too large of a turbo may make great power. But if your rev limit is at 7000 and max power is at 6500 it may not work out for you.

Mating a large compressor to a small exhaust housing and turbine, may give you the boost levels you desire, but after a certain RPM the turbine becomes so restrictive it actually is unable to get all the exhaust gasses past the turbine wheel. Creating huge amounts of back pressure, this will leave already burned gasses in the combustion chamber (because it is not all exhausted) diluting the intake charge, lowering the volumetric efficiency of the engine and hurting power. Some like to describe it as acting like an EGR valve. ", At the boost levels we are talking about i guess you are saying that there will not be any noticable volumetric defficiency with a p18? However at high boost a larger exhaust/turbine housing is a must to avoid backpressure.

Whats the turbine housing of the turbo i have now compared to the p18? Or is it the same? What does p18 refer to in metric units then?

Here are some good links i found too that may of useful reading for people trying to learn the same stuff in the future:

http://www.turboneticsinc.com/catalog/parts_list.html - turbo schematic.

http://wwwrsphysse.anu.edu.au/~amh110/turbo_page.htm - bit about A/R

http://www.magnusmotorsports.com/g-pumper.htm - where i nicked that quote from

http://www.michiganturbo.com/trouble.htm - Brilliant troubleshooting sheet!!

Cheers

Paul





[Edited by paulwadams_my99 - 7/10/2002 12:55:26 PM]

paulwadams_my99

Tim,

don't look at the passenger seat down on the right. There may be some "craner's" hand grips there now

YHM.

cheers

Paul.


[Edited by paulwadams_my99 - 7/10/2002 2:15:58 PM]