my '94 Miata has 102k miles. Only modifications are timing bumped to 14 degrees, and a borla exhaust.
102hp and 98tq, very consistently over 17 pulls.
typical?
also; i started the run at 3000rpm. the a/f ratio would ripple a little and then settle down by 4000rpm. unfortunately it settled very rich. is that typical too?
Dynojet? If those are Dyno Dynamics/Mustang, I'll gladly trade. If Dynojet, we're both not in the best shape, see my thread today. Stock timing and a Goodwin exhaust.
That's right about what we used to see on our Dynojet, including the A/F fluctuations from the closed loop dithering.
Keith Tanner wrote: That's right about what we used to see on our Dynojet, including the A/F fluctuations from the closed loop dithering.
Corrected, or no? Aren't you at 5000+ feet?
Corrected, which is usually pretty darn accurate for naturally aspirated cars. Unless you have a climate controlled dyno room, always use correction.
Out of curiosity, what are the uncorrected numbers you see Keith?
Depends on the temperature, air pressure and humidity. Correction factors up here range from 16-21%.
this was on a dynojet.
so keith (or anybody), is there room for meaningful improvement simply by retuning the air-fuel ratio? 11:1 seems like it's leaving something on the table.
The Spec Miata guys seem to do pretty well by dinking around with fuel pressure. I don't know how it would work out off the racetrack, though. Naturally aspirated engines have a pretty big sweet spot to play with.
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