turbo spool-up differences

JShadzi@aol.com JShadzi@aol.com
Sat, 24 May 2003 00:27:29 EDT


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Are you both running the same bottom end?

Javad

In a message dated 5/23/2003 1:22:27 PM Pacific Standard Time,
bradym@sympatico.ca writes:

> 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
> stock.
> 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
> setup.
>
> Cheers,
> 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
>