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944 man

944 man

Active member
Can anyone direct me towards a resource which describes the boost profile for my car, please? Whilst I'm posting I also have a slightly unusual second question: is it feasible to wire the waste gate closed? After fitting a boost gauge this would appear to be the easiest way to establish how much boost pressure is being lost.



Simon
 
Put it on a dyno for £50 and that will tell you exactly what you will be loosing. Either that or just get a DPW.
Alasdair
 
Simon,

A long time ago, on my friends chipped 250T with standard, but healthy wastegate, we tested with a pressure gauge connected to the inlet manifold. We tested the car in 2nd and 3rd gears, there was no difference in the results. The method was as follows. Drive at 1500 rpm, fully open throttle, measure inlet manifold pressure at two points up to 5000 rpm. These were the results:

Pressure at 2500 rpm 0.4 to 0.5Bar.

Max pressure achieved 0.95 bar.

This is gauge pressure, not absolute pressure as per the instrument cluster gauge.

 

ORIGINAL: 944 man

Whilst I'm posting I also have a slightly unusual second question: is it feasible to wire the waste gate closed? After fitting a boost gauge this would appear to be the easiest way to establish how much boost pressure is being lost.



Simon
Click to expand...

I suppose you could shim the wastegate until it stays shut.
 
there are loads of dyno charts on rick cannell's site that you could use for comparison.

have you got a boost enhancer fitted? that should help a bit...

a tial / dpw will help, particularly at the top end but from what you've said to me it sounds like the problem is more a failure to build boost lower down.

I've got a working standard wastegate if you're interested... ;)
 
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