Baseline jetting suggestions?

Posted By: OA5599

Baseline jetting suggestions? - 06/15/14 04:18 PM

Ordered 770 Ultra Street Avenger vac secondary carb. Might throw it on today. Car ran 11.20s at 119 with current 750 double pump worked by local carb shop to be a "race" carb. That's too fast for Sportsman class and too fast for no roll cage. Car is 95% street driven at this point, so hoping this new carb will be a little friendlier and possibly slow it down a bit. It's brand new in the box right now, and have no idea what jets are in it. Any suggestions for a safe front and rear jet to start with?

69 Cuda. 3500 lbs with driver.
418 stroker 10.3:1 comp (pump gas)
Fully CNC'd Eddy Heads from Hughes.
Ported Airgap intake.
248/252 .600/.610 solid cam
Holley 750 modded to flow 910 CFM
MSD E-Curve dist with 6-AL
TTI torque stepped headers w/ Ultra Flo mufflers
3:91 727 Tight 10" converter.

For what it's worth, a local car show had a portable dyno that seemed to think the car puts down 485 HP at the wheels and around 450 ft lbs at the wheels.

Thanks

Posted By: Quicktree

Re: Baseline jetting suggestions? - 06/15/14 05:57 PM

send it back and get 1 of these

http://www.etgenie.com/

Posted By: OA5599

Re: Baseline jetting suggestions? - 06/15/14 06:34 PM

I have 90 days to return it if I don't like it. I like the ET Genie, but I don't have the clearance to run it. The new carb has a choke and vac secondaries. I have time to give it a chance. Most people running the carb on the street seem to love it. I'll be keeping my 750 DP in case this new carb doesn't work out. But right now, the DP is most happy at wide open throttle. The shop that built the carb said it was built with best ET in mind, and not street duty.

Posted By: Crizila

Re: Baseline jetting suggestions? - 06/15/14 06:54 PM

Quote:

I have 90 days to return it if I don't like it. I like the ET Genie, but I don't have the clearance to run it. The new carb has a choke and vac secondaries. I have time to give it a chance. Most people running the carb on the street seem to love it. I'll be keeping my 750 DP in case this new carb doesn't work out. But right now, the DP is most happy at wide open throttle. The shop that built the carb said it was built with best ET in mind, and not street duty.

Just run it out of the box and see how it does.

Posted By: DaveRS23

Re: Baseline jetting suggestions? - 06/15/14 07:07 PM

A couple of things come to mind here;

First, if you like the ETGenie, why not just mill the 1" off the intake for the clearance that you need?

And before you make any changes to the new carb, you should run it and get some readings with a wide band. Otherwise you are just guessing as to what (if anything) needs attention and by how much.

Posted By: OA5599

Re: Baseline jetting suggestions? - 06/15/14 07:21 PM

Quote:

A couple of things come to mind here;

First, if you like the ETGenie, why not just mill the 1" off the intake for the clearance that you need?

And before you make any changes to the new carb, you should run it and get some readings with a wide band. Otherwise you are just guessing as to what (if anything) needs attention and by how much.

I like the idea of the ET Genie, but I don't need it. I simply don't race enough to justify one. The car is driven on the street more and more as years go by, rather than raced. I don't have a wide band on it. Just curious if anyone had suggestions on ball park jet sizes for baseline, and it can be tuned from there. Thanks for the responses.

Posted By: Hot 340

Re: Baseline jetting suggestions? - 06/15/14 07:55 PM

Stock jetting IS a good baseline. Go from there.

Posted By: joedust451

Re: Baseline jetting suggestions? - 06/15/14 09:36 PM

Quote:

Stock jetting IS a good baseline. Go from there.

Start there.

Posted By: Dan Brewer

Re: Baseline jetting suggestions? - 06/15/14 09:46 PM

I have a fast wideband if you want to weld in a bung. Your welcome to use it.