eightytwoturbo Posted June 3, 2007 Share Posted June 3, 2007 I just recently installed a boost gauge and its pinging at 4 psi, shouldnt stock boost be around 7? IF so what can cause to run such low boost? Quote Link to comment Share on other sites More sharing options...
Shift Posted June 3, 2007 Share Posted June 3, 2007 I just recently installed a boost gauge and its pinging at 4 psi, shouldnt stock boost be around 7? IF so what can cause to run such low boost? Whats the setup? Might want to retard the spark a little. Quote Link to comment Share on other sites More sharing options...
eightytwoturbo Posted June 3, 2007 Author Share Posted June 3, 2007 All I have is cold air intake, retard the spark eh? Ive turned the cap as far as it will go retarded.. runs worse the other way. Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted June 3, 2007 Share Posted June 3, 2007 Something is not right. Do you have a wideband? or a fuel pressure gauge? Start with checking the easy stuff. Reseat the ECU, clean all grounds and contacts. make sure there are no vacuum leaks. Change the plugs and make sure to get NGK plugs. I am assuming this is a stock ZX turbo motor running with no IC and stock electronics. Quote Link to comment Share on other sites More sharing options...
eightytwoturbo Posted June 3, 2007 Author Share Posted June 3, 2007 No wideband, no fuel pressure gauge, but I guess I can borrow a friends to check it, yes its stock and and stock electronics. Quote Link to comment Share on other sites More sharing options...
eightytwoturbo Posted June 4, 2007 Author Share Posted June 4, 2007 Okay I just got done cleaning all electrical, and checked all my vacuum, its running very close to 5psi but when my car shifts(auto) it moves to 6-7 psi but then back down to 5psi a second later... wtf? I changed my plugs last week with ngk's so I know it is not them. I guess i'm gonna try to test my fuel pressure tommorow and see what it is reading. Any more help would be great, I thought boost was suppose to drop during shifts but In this case its opposite.. Quote Link to comment Share on other sites More sharing options...
oinojo Posted June 4, 2007 Share Posted June 4, 2007 Okay I just got done cleaning all electrical, and checked all my vacuum, its running very close to 5psi but when my car shifts(auto) it moves to 6-7 psi but then back down to 5psi a second later... wtf? I changed my plugs last week with ngk's so I know it is not them. I guess i'm gonna try to test my fuel pressure tommorow and see what it is reading. Any more help would be great, I thought boost was suppose to drop during shifts but In this case its opposite.. have you checked your throttle linkage? It may not be opening up all the way. I know i experienced this thinking i had a boost problem (5psi), popped my hood and found that there was more throttle to be had. Quote Link to comment Share on other sites More sharing options...
eightytwoturbo Posted June 4, 2007 Author Share Posted June 4, 2007 have you checked your throttle linkage? It may not be opening up all the way. I know i experienced this thinking i had a boost problem (5psi), popped my hood and found that there was more throttle to be had. Linkage is good, just checked it and tightened it some, no difference there. Quote Link to comment Share on other sites More sharing options...
Clifton Posted June 4, 2007 Share Posted June 4, 2007 I would look at timing first. I don't know what your timing should be at at idle but have you checked that yet? Even if you were a little lean it won't cause knock unless you are really close to the edge, which you should'nt be running under 7 psi. You running atleast 91 octane? Quote Link to comment Share on other sites More sharing options...
eightytwoturbo Posted June 5, 2007 Author Share Posted June 5, 2007 Timing Light said it was perfect, I blew a headgasket before because the timing was way too advanced, its right on the money now (or says the timing light) The dizzy is retarded all the way, and Ive already moved it once from up under. I use 93 octane every time I fuel up. Quote Link to comment Share on other sites More sharing options...
Slow_Old_Car Posted June 6, 2007 Share Posted June 6, 2007 sounds like you are off a tooth on the dizzy shaft... if your having to clock it one way all the way in order to get near accurate timing. put the car to TDC on cyl 1 and recheck the orientation of your dizzy shaft w/ the dizzy off... be VERY anal that it's exactly as shown in a FSM. i'm guessing you'll find it's 5-15 degrees off the axis shown in FSM, which means as your timing adjusts when your boosting, the car then goes into a improper curve. Quote Link to comment Share on other sites More sharing options...
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