“Stuttering” boost?
Apr 23, 2004 | 01:27 AM
#1
“Stuttering” boost?
Hi guys,
I have a friend with an EVO VI TME, he has a MoTeC engine management system with a MAP sensor installed but the MAF was still on the car, the only reason for that was to use the air temp sensor. Since that is far from an ideal position for the sensor we removed the MAF and installed a Bosch stand alone temp sensor close to the intake.
Now when he drives his car at full throttle in 4’th and 5’th gear and the boost peaks around 1,8 bar (26psi) at about 3500rpm we get a very clear stuttering sound and the boost meter needle fluctuates so fast it gets blurred then as the rpm increases over 4000rpm this goes away as the boost tapers slightly and it’s also not present from 1’st to 3’rd gear.
Our theory is that since we removed the MAF we removed some air restriction and at 26psi the stock turbo is out of it’s physical limits and starts to cavitate? Just want to get an opinion to see if that seem to be a correct assumption?
I have a friend with an EVO VI TME, he has a MoTeC engine management system with a MAP sensor installed but the MAF was still on the car, the only reason for that was to use the air temp sensor. Since that is far from an ideal position for the sensor we removed the MAF and installed a Bosch stand alone temp sensor close to the intake.
Now when he drives his car at full throttle in 4’th and 5’th gear and the boost peaks around 1,8 bar (26psi) at about 3500rpm we get a very clear stuttering sound and the boost meter needle fluctuates so fast it gets blurred then as the rpm increases over 4000rpm this goes away as the boost tapers slightly and it’s also not present from 1’st to 3’rd gear.
Our theory is that since we removed the MAF we removed some air restriction and at 26psi the stock turbo is out of it’s physical limits and starts to cavitate? Just want to get an opinion to see if that seem to be a correct assumption?
