I have a manual '70 Chevelle SS396, original motor and crank, but, nothing else... Edelbrock 6045 heads, Comp cam 292h, air gap manifold, kb pistons, high end valve train, 9.5 to 1 comp, headers, 3 inch exhaust, Holley 750 dp etc....
Anyway, I have been tuning the carb and the Chevelle kept dieing on the top end, ie. past 5500 rpm, she would lay over... So, then, one time, I upped the jets again, and at 5700 rpm, she slowed down, like I let off the gas.. Then, it hit me, reminded me of my old vortech blown 5.0 mustang, when the electric fuel pump was acting up...
Anyway, I go look at the Edelbrock mechanical 110 gph fuel pump and their is a little bit of oil coming out of the peep hole.. So, I change it out to a 110 gph holley and low and behold, the Chevelle now wakes up past 5500 rpm... Lesson learned again.... If she is dying up top, it could be the fuel pump...
I started from the beginning on the jetting and ended up with a 5.5 power valve, 72 primary jets and 81 secondary jets... Also added an accel adjustable vacuum advance that I calibrated to the following timing.. 19 base, 37 total mechanical, 52 total with Vacuum advance... I am finally happy withe tune...
Now its time to tune the Nitrous... It is currently jetted for a 150 hp shot... but, this mechanical fuel pump has me a little scared... These pumps are only rated to 110 gph and 600 horse... I am wondering with a 150 hp shot, will I be past the the fuel capacity... I have the bigger fuel lines... In the past, I blew a piston and cracked a block with a Vortech blower on a '94 5.0 mustang cobra. I had plenty of pump, but, my lines were stock and too small and I ran out of volume.. I kept increasing the injector pulses, but, the volume killed me...
With a Tremec TKO 600 and the 12 bolt rear, eaton posi, moser axles, the drive train can handle it, but, I am wonder if this 150 hp shot of Nitrous is too much for the mechanical 110 gph fuel pump... Maybe, I should go down to a 100 hp shot instead.... Any feedback on this would be appreciated... Thanks.
Anyway, I have been tuning the carb and the Chevelle kept dieing on the top end, ie. past 5500 rpm, she would lay over... So, then, one time, I upped the jets again, and at 5700 rpm, she slowed down, like I let off the gas.. Then, it hit me, reminded me of my old vortech blown 5.0 mustang, when the electric fuel pump was acting up...
Anyway, I go look at the Edelbrock mechanical 110 gph fuel pump and their is a little bit of oil coming out of the peep hole.. So, I change it out to a 110 gph holley and low and behold, the Chevelle now wakes up past 5500 rpm... Lesson learned again.... If she is dying up top, it could be the fuel pump...
I started from the beginning on the jetting and ended up with a 5.5 power valve, 72 primary jets and 81 secondary jets... Also added an accel adjustable vacuum advance that I calibrated to the following timing.. 19 base, 37 total mechanical, 52 total with Vacuum advance... I am finally happy withe tune...
Now its time to tune the Nitrous... It is currently jetted for a 150 hp shot... but, this mechanical fuel pump has me a little scared... These pumps are only rated to 110 gph and 600 horse... I am wondering with a 150 hp shot, will I be past the the fuel capacity... I have the bigger fuel lines... In the past, I blew a piston and cracked a block with a Vortech blower on a '94 5.0 mustang cobra. I had plenty of pump, but, my lines were stock and too small and I ran out of volume.. I kept increasing the injector pulses, but, the volume killed me...
With a Tremec TKO 600 and the 12 bolt rear, eaton posi, moser axles, the drive train can handle it, but, I am wonder if this 150 hp shot of Nitrous is too much for the mechanical 110 gph fuel pump... Maybe, I should go down to a 100 hp shot instead.... Any feedback on this would be appreciated... Thanks.
