Holley EFIHaving a problem reading max boost which seems to be low by about 10 psi. I'm suspecting something with MAP sensor, as idle is producing -10 inHg on in car boost/vacuum gauge, while Holley datalog is saying -5 (boost psig) with a MAP of 65 kPa.
Junior Member
Boost Gauge vs Boost PSIG
Having a problem reading max boost which seems to be low by about 10 psi. I'm suspecting something with MAP sensor, as idle is producing -10 inHg on in car boost/vacuum gauge, while Holley datalog is saying -5 (boost psig) with a MAP of 65 kPa.
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Just for reference: http://forums.holley.com/showthread....SI-Equivalents (MAP kPa to Boost PSI Equivalents & Boost Control Information)
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'78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires
Junior Member
Well thank you for the rapid response, but I don't see how this answers my question of why idling, my boost psig is 5 and my vacuum gauge in the car say 10 inHg. I pointed this out as a possible reason the boost side is lower than I expected. For simplicity sake, I just want a datalog parameter that will equal my boost gauge in the car.
Member
In Danny's link, 65 kPa = -10.36 inHg = -5.07 psig. Seems like everything is correct to me. Greg
Junior Member
Thanks for the response!
Junior Member
If I could re-cap the problem that got me here in the first place. If I have a Boost psig of 5.5 kPa with a MAP of 140 and a barometric of 101, the tables I've seen say this is just about 5 lbs of boost. Just would like to have somebody say this is correct, before I rip into the new intercooler I just installed.
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