Limits of boost on a stock motor
04-24-2003 | 11:04 AM
#11
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Originally Posted by Jan Niemi
untuned (besides my own VAFC hacking..) this was on pump gas 94 octane Sunoco, which is what I always run, stock cam timing, stock ignition timing.
04-24-2003 | 08:42 PM
#12
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450cc injectors with fuel presure at about 60psi at idle. it will top out at about 72psi cause the stock FPR is a 1:1 riser when it sees boost. I haven't gotten a track time yet...I hope to soon....I know as boost rolls on in 2nd gear the tires have a very hard time with traction and in 3rd on the shift they will still spin a bit. I am hoping for very low 13's on street tires and high 12's(like jan) on drag radials
04-24-2003 | 11:38 PM
#13
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From: City of Boost
Originally Posted by fredtoast
[quote:fe3cef10a4="Jan Niemi"]untuned (besides my own VAFC hacking..) this was on pump gas 94 octane Sunoco, which is what I always run, stock cam timing, stock ignition timing.
440cc, stock reg (modified to reduce fuel pressure)
I can't tell you what hp you can run on stockers, but last year I was still running stockers with a 1:12 FMU (for every 1 psi boost = 12 psi fuel pressure rise) and a Holley FI pump with an AEM rail. The fuel pressure at full boost (full boost for me last year was about 8-9 psi) was well in excess of 100 Psi, anyways the best I could do in the 1/4 was 13.6 (with my shytty driving and stock tires) Top mph last year was 109, this year with the different fueling, and open downpipe my butt dyno tells me she pulls much harder at the top end (best mph 115.9) so far this year, I don't attribute the gain just to fueling, but I feel that it was a significant factor.