bum2kev Posted October 31, 2007 Report Posted October 31, 2007 Ok so today i got my boost gauge and decided just to hook it up real quick in the engine bay to see where my idle was at. it was pretty much on -16psi. now i read that it should be betweeen 18-22 I then took it for a drive with my vac line coming out of the hood and into the window. at 65mph im getting -21-22 psiI also have an ipd ecu and it is boosting at 12.5psi and peaking on shifts at 14-15psi. So my engine bay is super clean, ive replaced all of the vac lines and mad sure that everything is tight. the one thing that I think might be the problem is my ic, as you can see from this postIntercoolerwould this cause my issues?ive put off getting a boost gauge cause the car seemed like it idled fine, but I wonder how much more power i would have if i was getting my 14.5 psi
Dmsee Posted October 31, 2007 Report Posted October 31, 2007 Check vacuum lines Is IPD should be 15psi?Intercooler might also play a little role
Account_Deleted_T5M Posted October 31, 2007 Report Posted October 31, 2007 If your only holding 16" of vacuum, then your losing boost. I hold 19-21" at idle, and 26-28" on decel. Replace all vacuum lines plus check all intercooler hoses, if you plan on raising the boost, then replace them, they crack and tear when they get old.Doesn't sound like you have a major leak but it's definately there. I would check the Throttle Body/ IAC hose first as it tends to crack around the joint there.
Dmsee Posted October 31, 2007 Report Posted October 31, 2007 If your only holding 16" of vacuum, then your losing boost. I hold 19-21" at idle, and 26-28" on decel. Replace all vacuum lines plus check all IC hoses, if you plan on raising the boost, then replace them, they crack and tear when they get old.Doesn't sound like you have a major leak but it's definately there. I would check the Throttle Body/ IAC hose first as it tends to crack around the joint there.I get around the same at idle 19-21 but cruising with gas pedal off 24 :(
bum2kev Posted October 31, 2007 Author Report Posted October 31, 2007 Check vacuum lines Is IPD should be 15psi?Intercooler might also play a little roleall the vac lines have been replaced. i even just rechecked them after i saw the psi.what should be the vacuum when driving on the highway?would a leaky egr cause this?
Oreo931 Posted October 31, 2007 Report Posted October 31, 2007 If your only holding 16" of vacuum, then your losing boost. I hold 19-21" at idle, and 26-28" on decel. Replace all vacuum lines plus check all IC hoses, if you plan on raising the boost, then replace them, they crack and tear when they get old.Doesn't sound like you have a major leak but it's definately there. I would check the Throttle Body/ IAC hose first as it tends to crack around the joint there.Get rid of that shitty VDO. You should not be pulling 28 vac on decel.
Dmsee Posted October 31, 2007 Report Posted October 31, 2007 Driving at 65 with gas pedal off should be around 25Get rid of that shitty VDO. You should not be pulling 28 vac on decel.Thats what I thought Big Autometers rule :lol:
Account_Deleted_T5M Posted October 31, 2007 Report Posted October 31, 2007 Get rid of that shitty VDO. You should not be pulling 28 vac on decel.Ummm buddy i don't have a VDO, i'm using two BRAND NEW autometer.... one a phantom and one a cobalt, they're not wrong Vdo got sold about two months ago
Dmsee Posted October 31, 2007 Report Posted October 31, 2007 Ummm buddy i don't have a VDO, i'm using two BRAND NEW autometer.... one a phantom and one a cobalt, they're not wrong Vdo got sold about two months agoThen your car is about to explode at 28 :lol:
Account_Deleted_T5M Posted October 31, 2007 Report Posted October 31, 2007 Maybe i'm just blind.... :lol:
drin850 Posted October 31, 2007 Report Posted October 31, 2007 i get about 28 on decel too. about 24-26 in idle
Oreo931 Posted October 31, 2007 Report Posted October 31, 2007 i get about 28 on decel too. about 24-26 in idlecool you must have a broken gauge too
Dmsee Posted October 31, 2007 Report Posted October 31, 2007 i get about 28 on decel too. about 24-26 in idleIdle at 24-26 thats way too much ;)
bum2kev Posted October 31, 2007 Author Report Posted October 31, 2007 new tb gasket, new iac hose. ALL VAC LINES ARE GOOD.
Che'_Moderator Posted October 31, 2007 Report Posted October 31, 2007 cool you must have a broken gauge tooTold you autometer was crap.None of you are pulling more than 24". If your gauge say you are replace it.For that matter if your pulling more than about 21" your cams or timing are screwed up.
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