only 15-17psi of boost???
Jul 14, 2003, 07:32 AM
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only 15-17psi of boost???
ok i just installed the boost gauge. from 1st, 2nd, 3rd and 4th gear the gauge only peaks out at 16psi?? on fifth, it peaks at right around 18psi. i am thinking it could be the waste gate. i knew my car was not gettin full boost after about a week i had the car.
what might cause this. someone must know.
thanks.
what might cause this. someone must know.
thanks.
Jul 14, 2003, 07:35 AM
#2
Tighten down the plastic hose that the Blow Off Valve blows back into. Its rubber on plastic, so it leaks. On my car, thats where my boost leak was.
Also check all of the other intercooler hoses and make sure they are tight. They are a little loose ffrom the factory.
Also check all of the other intercooler hoses and make sure they are tight. They are a little loose ffrom the factory.
Jul 14, 2003, 11:17 AM
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my problem is that the car does not even peak at 19 lbs of boost.
my peak boost i've seen on my car is 16.5 at each gear. its not even near 19lbs.
i am sure i have a leak somewhere.
my peak boost i've seen on my car is 16.5 at each gear. its not even near 19lbs.
i am sure i have a leak somewhere.
Jul 14, 2003, 12:04 PM
#7
boost levels also depend on the weather conditions, if its hot and humid at where you are, chances are that you wont get full boost. My boost is around 1.1-1.25 bar on normal days(70ish, not humid), on hot days my boost is around 1-1.1 bar.
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Jul 14, 2003, 12:05 PM
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Originally posted by 19psi
my problem is that the car does not even peak at 19 lbs of boost.
my peak boost i've seen on my car is 16.5 at each gear. its not even near 19lbs.
i am sure i have a leak somewhere.
my problem is that the car does not even peak at 19 lbs of boost.
my peak boost i've seen on my car is 16.5 at each gear. its not even near 19lbs.
i am sure i have a leak somewhere.
It's the dealers problem if your not to modded.
Jul 14, 2003, 12:10 PM
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the 19psi is only up to 3500 and in order to reach this boost level you will need to floor the car from idle, my quess why the car was designed like this was to decrease spool time. Take a run tonight around 9pm stop take off and nail the gas from idle all the way to red line, if at all possible have osmeone ride with you to monitor boost or if you can record the boost levels. The car was never designed to run 19psi it was designed to run 16.24psi. Only thing 19psi was for was spoolup time. Of course you won't see 19psi in every gear becasue I mean how ofter are you fully floored between gears and under 3500. My guess is never becasue it's almost impossible, however you can cruise in a gear below 3500 and nail the gas and should see a spike of 19 psi for a second. Play around with it you learn the boost patterns.
PS anyone ever notice how long your car is in 1st gear.... not very long is it, and guess what it's not below 3500 for long either.
car was built to rev fast and hard.
PS anyone ever notice how long your car is in 1st gear.... not very long is it, and guess what it's not below 3500 for long either.
car was built to rev fast and hard.
Jul 14, 2003, 12:13 PM
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Yeah, 1st from a roll in the EVO feels shorter then when I used to launch the 2G GSX
hehe .. I dunno about 1st but I can't wait till I get the works flash for 93, DP, and the perrin installed. I want to AWD chirp 2nd
hehe .. I dunno about 1st but I can't wait till I get the works flash for 93, DP, and the perrin installed. I want to AWD chirp 2nd
Jul 14, 2003, 12:15 PM
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Originally posted by 1QWKEVO
the 19psi is only up to 3500 and in order to reach this boost level you will need to floor the car from idle, my quess why the car was designed like this was to decrease spool time. Take a run tonight around 9pm stop take off and nail the gas from idle all the way to red line, if at all possible have osmeone ride with you to monitor boost or if you can record the boost levels. The car was never designed to run 19psi it was designed to run 16.24psi. Only thing 19psi was for was spoolup time. Of course you won't see 19psi in every gear becasue I mean how ofter are you fully floored between gears and under 3500. My guess is never becasue it's almost impossible, however you can cruise in a gear below 3500 and nail the gas and should see a spike of 19 psi for a second. Play around with it you learn the boost patterns.
PS anyone ever notice how long your car is in 1st gear.... not very long is it, and guess what it's not below 3500 for long either. car was built to rev fast and hard.
the 19psi is only up to 3500 and in order to reach this boost level you will need to floor the car from idle, my quess why the car was designed like this was to decrease spool time. Take a run tonight around 9pm stop take off and nail the gas from idle all the way to red line, if at all possible have osmeone ride with you to monitor boost or if you can record the boost levels. The car was never designed to run 19psi it was designed to run 16.24psi. Only thing 19psi was for was spoolup time. Of course you won't see 19psi in every gear becasue I mean how ofter are you fully floored between gears and under 3500. My guess is never becasue it's almost impossible, however you can cruise in a gear below 3500 and nail the gas and should see a spike of 19 psi for a second. Play around with it you learn the boost patterns.
PS anyone ever notice how long your car is in 1st gear.... not very long is it, and guess what it's not below 3500 for long either.
car was built to rev fast and hard.
I really wish people would stop speculating... This is wrong.. the car was made to peak to 19PSI, then the ecu bleeds off boost to ~19psi to avoid detonation in the upper range.. The boost curve is like this on pretty much all turbo cars.. pretty much any factory turbo car will bleed off boost near readline.
-Zach
Jul 14, 2003, 12:22 PM
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Originally posted by 1QWKEVO
maybe you missed where I mentioned a spike
btw our cars are bleeding boost at 3500, not exactly where my redline is either
maybe you missed where I mentioned a spike
btw our cars are bleeding boost at 3500, not exactly where my redline is either
No the factory solenoid bleeds boost starting ~3500rpms.. Put on a manual boost controller and it will hold 19psi to redline no problems.
Jul 14, 2003, 12:28 PM
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hahahahah man no sh*t, thats why it's called a bosot controller. I'm talking about factory settings, the dealer designed the cars boost patter for spoolup not to save their @$$ from knock. You yourself said it the car will hold 19psi. The car in stock trim will knock on california gas, owners manual says to run roughly 94 octane gas. However running 19psi with around 95-96 octane should be fine, i've been running some tests with various octane numbers, boosters, and psi's.
PS turbo will hold 21psi but tapper off at the high RPM due to the exhaust housing design. Anyone test single scroll housings on evo's yet? I'm curious as to ho much it helps in the upper rpm's
PS turbo will hold 21psi but tapper off at the high RPM due to the exhaust housing design. Anyone test single scroll housings on evo's yet? I'm curious as to ho much it helps in the upper rpm's
Last edited by 1QWKEVO; Jul 14, 2003 at 12:30 PM.
Jul 14, 2003, 12:30 PM
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Last post on this subject.. tired of wasting time.. The point is the car boosts to 19PSI then the factory solinoid bleeds off boost to ~16psi.. that is why in the sales material it said ~19psi peak boost and ~16psi after that.. it is also listed as a feature that it bleeds off boost to protect the engine.