I've done a significant amount of dynoing with US downpipe/cat, US downpipe/hollow cat, headers/cat, headers/hollow cat and euro downpipe (no cat). According to the dyno they were all about the same statistically.
-josh --- [email protected] wrote: > 1. Car in question: > > '91 GTI 16V > w/European Motorworks stage II 1.8 16V head, euro > intake cam, Garrett chip, > 50mm intake, Borla exhaust, 3.90 ring and pinion, > and .80 5th gear > 140hp@the wheels. > > Recently, I added a set of Kent 258 regrinds... AND > a big fat passat > catalytic converter. > So, unfortunately it's not a totally accurate > comparison, because the > catalytic will rob some high end power. > > The idle is nice and still pretty smooth. There's > only a slight lump in the > exhaust note which most people probably won't even > notice. My gas mileage > seems to still be the same. > > There's a slight loss of power under 4000 rpms (keep > in mind the other mods I > have, like the euro intake), but there's a nice > improvement from > 5000-7500rpms. The powerband feels like it drops > off at about 7200rpms, but > the motor will rev easily to 7500rpms. > > From my previous experiences with and without a cat > on my car, it seems that > the cat really robs power above 6500rpms - basically > in "cam territory". If > I hadn't installed the cat, I think there would have > been a bigger > improvement at the top end. Also, even though the > car still has PLENTY of > low end grunt, this is the first mod I've done that > made a noticeable loss of > torque. > > > 2. Previously, we had installed these cams in my > friend Paul's 16V. Here's > my observations from that car: > > '87 GTI 16V 2.0L block, 1.8 head, autotech power > module, eurosport exhaust, > euro intake cam. > When we put the Kents in that car, we made no other > mods, so this is a > slightly more accurate review. > Slight loss of low end below 4000 rpms (not as > noticeable as in my car, > probably since Paul doesn't have a euro intake > manifold), and a nice gain > from 4500-6500rpms. > We were very pleased with the results. > > > > _______________________________________________ > A2-16v mailing list > [email protected] > http://maillist.myip.org/mailman/listinfo/a2-16v ===== Josh Wyte Momentum Motorsports 508-833-3024 After 5 pm EST __________________________________________________ Do You Yahoo!? Sign up for SBC Yahoo! Dial - First Month Free http://sbc.yahoo.com
