turbo spool-up differences

Brady Moffatt bradym@sympatico.ca
Fri, 23 May 2003 16:14:35 -0400

Hi All,

It's good and it's bad to have a friend with another urq. We end up
comparing a lot....

Louis-Alain's and mine are both early 83's, with K26 turbos.
Mine has a Lehmann ECU and WG spring as well as a SQ diaphragm. His is
Mine has no cat at all and his is hollowed out. Otherwise, the exhausts
appear to be identical.
Stock intakes on both cars.
Mine has a Blitz BOV (I know, I know, bad thing...) His does not.

Here's the weirdness: Louis-Alain's makes boost WAY faster, but mine pulls
much harder when it does build boost.

I would have thought that with a BOV I should build boost faster after a
shift, and that in 1st gear there should be no difference. That's obviously
not the case. If I had a boost leak, that would explain slow spool-up, or
more accurately, slow onset of boost. But, wouldn't I take a hit on maximum
total boost with a leak? It almost seems as if he has a K24 or I have a K27
or something huge.

I'm now happy with the power my car makes, but I'm wondering if I can also
have the quick (well, I suppose it's all relative) spool-up of a stock K26

Brady Moffatt
Montreal, Quebec, Canada
83 UrQuattro with 52,000 miles
86 4ksq with 310,000km
86 4ksq parts car
72 Datsun 240Z with 180,000 miles
92 VW Golf with 200,000km FOR SALE
in middle stages of quattrosis accumulatus

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