i have a holley 600 on my sp 12a... here's the scenario:

i was running #60 primary jets and #63 secondary jets... the car was fast,,, but it was a freaking beast from 5.5k to 8k rpm's,, the pickup at that rpm range was incredible!!! but below that,,, it felt like it was getting too much gas and that it could do better... so i changed to #57 primary and stayed #63 secondary.... now the car is a beast up to around 5.5k rpm's but doesn't have the same pick up after that... so i know #57 is a good primary jet # for my car....

the question after this prologue is:

would it make sense to raise the secondary jet # by 3 since i reduced the primary jet # by 3??? so #57 primary and #66 secondary???

i would just find out through trial and error,, but tonight is track night and the spilling of gas to change jets is a pain in the @$$.... i just want to know if my way of thinking is correct,, if i lower primaries by 3,, i should raise secondaries by 3 to keep same high rpm power... thanks in advance....

:flush:

 

wow you got me there, maybe you should up the primaries one or two more?



mike

 

Keep the primarys where its good..bump the secondaries up a couple..

The jet sizes I changed to when I PMed you sucks ***..



Im running like 67 primarys and 77 secondaries (I think) abd now pushing 6 psi fuel..and car runs like ****.I have been workin 10-13 hr days ..and No time to rejet it..Tell me what You changed to and I will try also..



YOu think you have a fast accel?If yoru runnign a Holley RacingBeat conversion..go to any auto store..get the Holly adaptor..or just a 1in spacer and see how it is..I just need to jet mine right ..and find out why my secondaries butterfiles are not opening up all the way with full throttle open with gas pedle..



Does your secondaries hit hard and open all the way Up?

 

update....



60 primarys..

67 secondaries..

6 psi fuel

timing advanced