slack 302 - FFCars.com : Factory Five Racing Discussion Forum

OLD_COBRA · 01-07-2005, 10:46 PM

stock bottom end, edlebrock rpm heads, comp extreme roller cam(541 lift, 260 dur) roller rockers 1.6, equal length headers (shorties),gt40 intake, 24 lb. inj.,70mm throttle body & mass air,underdrive pulleys,spark plugs indexed, everything ground to match. I only pull 245 @ the rear wheels. not enough fuel?

Gordon Levy · 01-07-2005, 11:43 PM

It depends on the dyno. You can go to 5 different dyno's on the same day and get 5 different readings. 245 at the rear wheels aquates to 300-310 at the flywheel. That cam you have, is that 260 duration @50 or advertised? If it as advertised, you would see some gain for a longer duration and lobe seperation. The other thing is fuel system a timing. Both if not optimized will cost you top end power. It would help to see and air/fuel curve. This is cridical to be able tune properly.

OLD_COBRA · 01-08-2005, 08:46 PM

Quote:

Originally posted by Gordon Levy:
It depends on the dyno. You can go to 5 different dyno's on the same day and get 5 different readings. 245 at the rear wheels aquates to 300-310 at the flywheel. That cam you have, is that 260 duration @50 or advertised? If it as advertised, you would see some gain for a longer duration and lobe seperation. The other thing is fuel system a timing. Both if not optimized will cost you top end power. It would help to see and air/fuel curve. This is cridical to be able tune properly.

OLD_COBRA · 01-08-2005, 08:48 PM

duh, part # 35-514-8 comp extreme. fuelratio runs basically flat @ 13. timing right now is @ 10

Gordon Levy · 01-08-2005, 09:07 PM

What is the timing at 3000 revs? Did you notice the air/fuel getting higher as the revs peaked? This is what total advance will be.
I checked in the specs of that cam and it is pretty mild. It drops off at around 5500 revs. This is a good torque can but doesn't produce top end hp.
I think the 35-312-8 or the 35-314-8 would work better for the lighter car.
Also a Victor 5.0 intake and 75mm t-body and air meter would help a lot.

Gordon Levy · 01-12-2005, 04:06 PM

Old, I have been thinking about your engine. I believe if you got rid of the shorty headers and went to a set of 4 into4's, you would pick up as much as 25hp.