Technical > Spud Miller's Cave

Not seeing any gains !

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masracingtd1167:
A little disappointed in the performance of my car this year ! After getting my tire problems straightened out I thought I could get my car to run in the six's ! Went from 15 percent to 20 and then 25 and no real gains at all ! Plugs look great and the motor seems happy ! The car runs the same MPH on nitro as it dose on straight alky ! It seems like the motor is falling off at 9400 and it used to pull good to 9700 ! Valve springs are fine ! I still have the same gear and converter that I used on alky and the converter is on the loose side it stalls at 8200 ! Wondering if a tighter converter would help! Just kind of lost and looking for some advice !

Curly1:
I do think the Nitro gains would be at lower RPM and tighter stall may help with that. With your motor turning lower RPM than it was before I suspect something else may be going on. What kind of injection you have?

msundstrom:
What jetting/ timing changes did you make for 25% if any?

masracingtd1167:
Over the winter I did drop the compression from 14.5 to 12 to 1 and I also went to a 14 lbs oil ring from 11 lbs and a tool steel top ring from a gapless ! Jetting from a 88 jet on alky to an 84 with the 25 percent !

dreracecar:
Such a low percentage is only going to give you stink and very little gain

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