View single post by Judson Manning
 Posted: 10-31-2005 02:09 am
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Judson Manning

Joined: 03-14-2005
Location: Atlanta, Georgia USA
Posts: 406

Running the Spec9 on my 2.0, I couldn't get the exhaust temp over 1200^F.  I also had terrible throttle response, and was black-flagged at Roebling Road for fogging insects down the front-stretch!  (WAY too rich)

I started experimenting with different jets that got to the more ideal 1500-1600^F range.  Ironically, this jetting was very close to the stock Euro JH jetting even though I had 9.5:1 pistons, a ported head, and higher lift cams.

Likewise, Sander's car was delivered to me with a Spec9ish set-up, and ran like a dog.  We leaned the mains closer to JH specs, did some other fiddling, and the car really came alive!

When I built the 907/910, I did have to fatten things up a bit, but still nowhere as rich as the Spec9.

Undoubtedly, we have a mystery if three of your cars run well on Spec9 and two of mine run poorly on the same set-up.  Have you ever run an EGT or O2 sensor on any of your cars?