Throttle stop inconsistent HELP!!!!!

[1968chevelle]

How are your 60' times when your runs are all over, we had trouble like that but our 60s was floating too, we ended up changing the co2 bottle (which still had preasure) and that took care of it, Im not sure if yours is elect. or co2, we use #1 stop, on ours our RPM's will climp while on the stop, however we are on stop for almost 4 sec.

[SSTHottie1236]

Originally Posted by Lou SG2340

Check to see if you hold a consistant rpm while on the stop. I shift by time . My car holds a consistant 4100 rpm the 2.5 to 3 sec. it is on the stop. When my car is inconsistant that is the first thing I check.

Have not run Q16 but it could be part of the problem. By going richer on the main jet you could be to rich on the stop. You could try leaning out the intermediate air bleed to see if this helps

I can check my dad's computer graphs to check out the consistency on the stop. I'll talk to my dad about that being too rich on the stop thing.

Originally Posted by 1968chevelle

How are your 60' times when your runs are all over, we had trouble like that but our 60s was floating too, we ended up changing the co2 bottle (which still had preasure) and that took care of it, Im not sure if yours is elect. or co2, we use #1 stop, on ours our RPM's will climp while on the stop, however we are on stop for almost 4 sec.

Unfortunately my car is back full throttle by the time I hit the 60' timer so it moves. That's why I was thinking about raising the stop RPM to 4400 just to be able to have more time in it so I can use the 60' times. The air bottle has just been filled so it's got between 1000 and 1500 psi of bottle pressure.

Thanks for the tips, guys!!!

Kelli
1236 S/ST

Get rid of the Q16 because it takes so much effort to get the carb right. Go to 115 or 114 and return the jets to their original size. I wasted too many races trying to get this right myself. When I went back to 115 and the jets Gary Stinnett told me to run it picked up .15 also.


Raise the throttle stop RPM to 4500 so the timer does not come back on during the 60ft and the car will return to it's previous consistency.

[SSTHottie1236]

Originally Posted by crewchiefpro

Get rid of the Q16 because it takes so much effort to get the carb right. Go to 115 or 114 and return the jets to their original size. I wasted too many races trying to get this right myself. When I went back to 115 and the jets Gary Stinnett told me to run it picked up .15 also.


Raise the throttle stop RPM to 4500 so the timer does not come back on during the 60ft and the car will return to it's previous consistency.

Thanks so much, Don. We used to run C12 and never had a problem. Is that an acceptable fuel? It works for both the motors' CRs so it's been the only other thing in my tank.
Hopefully this fixes it all and I'll actually get to put some runs in your program once the car makes some quality runs

Kelli
1236 S/ST

C12 is fine for under 14 to 1, over you should look to 115 imho.

What jets did you run when you ran 112?