Still got a severe loss of power at 3800rpm.

Steve Arndt · Post by **Steve Arndt** » Fri Jun 01, 2001 8:25 am

If you already know that it is full rich on your a/f gauge (or .9 someting on your voltmeter) try leaning it down just a bit then make a run and check the results. When I dropped bigger venturis into my webers I tried the 4.1*venturi for main jet sizing. It was slugish as heck. As soon as I jacked the air jet up from a 200 to 220 it came alive and could pull another 1000 RPMs! It could be a similar situation, just too rich at that point? I don't know.

Steve Arndt · Post by **Steve Arndt** » Fri Jun 01, 2001 9:55 am

Ignition info that may help. http://sdsefi.com/techign.htm
(I know you don't use efi [yet] but the numbers still can serve as a guide of what you are shooting towards).
Steve

Matt Keene · Post by **Matt Keene** » Fri Jun 01, 2001 12:37 pm

Moggy, if you do go the water injection route, be careful not to advance the ignition above 28 degrees if you intend to run 10 psi. I spoke to your engine builder at length about this subject and he backed up his theory with a long series of dyno runs on Mark T's 2.3L turbo engine. Running 12 psi and a water charge cooler, he found 28 to be the magic number. Anymore advance tended to be on the border line of detonation. However, increasing the total advance from the pre-water injection setting of 24 degrees to 28 increased power by 28 bhp. Not bad! I'm just off to fiddle with my timing...