Tommy29 Posted May 18, 2009 Report Share Posted May 18, 2009 My boost is acting very weird and hopefully you guys can help me out here. When the engine is cold or just starts up I can't get more than 2psi in the first 2 gears without it bogging down and the turbo blowing like crazy! then it heats up and holds up to about 5-7 psi, if i am WOT it might hit 8 psi but it is really stuttering and I can here it relieving pressure like crazy, no whistle or anything like a BOV but more like pulsating bursts of air. Is this just the stock computer telling it to stop boosting or what? also is there any way to easily get more boost pressure out of the stock turbo? I saw the adding T's to the vacuum lines thing and wondered if that was the easiest way to do it and where can I get those T's at? I have the air/fuel gauge and that says all is good and the blaster 2 coil is working perfectly with the ngk plugs as well. Listened to it at idle and revved up but I cannot here a leak anywhere! I guess It is holding pressure fine when warmed up I just want to be able to go WOT for more than a few seconds without upgrading my stock turbo yet. Can someone give me a detailed way to increase my stock psi inexpensively or remove that computer cut limit?? Link to comment Share on other sites More sharing options...
Indiana Posted May 18, 2009 Report Share Posted May 18, 2009 First of all you should never boost a cold motor. Its your car, sounds like you are eager to blow it up but anyway. You can't make boost if the exhaust is plugged up. Can't make boost if the wastegate actuator isn't seated. Can't make boost on cheap fuel, wrong ignition timing, wrong spark plugs, fouled spark plugs, dirty injectors, dirty TPS, clogged fuel filters or dying fuel pump. Cam timing off, mechanical rocker arms out of adjustment. Need to enlighten up some more about your car, what year is it, what has been done to it etc. Link to comment Share on other sites More sharing options...
Tommy29 Posted May 18, 2009 Author Report Share Posted May 18, 2009 First of all you should never boost a cold motor. Its your car, sounds like you are eager to blow it up but anyway. You can't make boost if the exhaust is plugged up. Can't make boost if the wastegate actuator isn't seated. Can't make boost on cheap fuel, wrong ignition timing, wrong spark plugs, fouled spark plugs, dirty injectors, dirty TPS, clogged fuel filters or dying fuel pump. Cam timing off, mechanical rocker arms out of adjustment. Need to enlighten up some more about your car, what year is it, what has been done to it etc. It is an 87 Starion. Stock everything except blaster 2 coil wires and plugs. all else is stock. I know not to boost a cold motor it would be nice to not bog out at 2 psi though! I am not eager to blow it up at all, it only has 80k on the whole body so i want it to last at least 100k more. I want to boost more than 7 psi and have replaced all the gaskets and changed all fluids less than 100 miles ago. I am taking care of it and want it to last a long time, I know it can take 10-12 psi without any fuel mods needed but I run 93 octane with the orange stp additive about every 3 times to clean it out. It has new plugs, injectors are clean and good flow, I don't really want to go completely standalone with the fuel system either so I was debating on 2 options, a 17c turbo or just up the boost to 10 psi on this one. either way i am going to get 1000cc injectors made by millenia. I also dont want to drop another 600 into it right now. Link to comment Share on other sites More sharing options...
Technology Posted May 18, 2009 Report Share Posted May 18, 2009 You have a leak somewhere, either between your mass air sensor and the turbo, between the turbo and the throttle body, or between the head and the turbo. My guess is the third. Check all your manifold nuts and studs and turbo mounting nuts. Hopefully you have the balls to check all those nuts, haha! that noise you described is more often called an exhaust leak. Wait till that bottom right gauge in your gauge cluster is halfway up, then you can get into the boost. Also, if it's cutting out/bogging, how the crap do you know if your MSD coil is working? Just because it's MSD doesn't mean it's good. Quite the contrary; I'm of the mind that MSD sucks, so don't claim something that can't be backed up. Please go through everything in the engine and tighten it. Link to comment Share on other sites More sharing options...
Tommy29 Posted May 18, 2009 Author Report Share Posted May 18, 2009 You have a leak somewhere, either between your mass air sensor and the turbo, between the turbo and the throttle body, or between the head and the turbo. My guess is the third. Check all your manifold nuts and studs and turbo mounting nuts. Hopefully you have the balls to check all those nuts, haha! that noise you described is more often called an exhaust leak. Wait till that bottom right gauge in your gauge cluster is halfway up, then you can get into the boost. Also, if it's cutting out/bogging, how the crap do you know if your MSD coil is working? Just because it's MSD doesn't mean it's good. Quite the contrary; I'm of the mind that MSD sucks, so don't claim something that can't be backed up. Please go through everything in the engine and tighten it. I tapped into each coil with volt testers and it is firing properly. even when it bogs down it fires properly. I didn't buy it because it is msd so it must be good... I have had msd coils on every vehicle i have every owned except my ninja, they have never failed on me and why change a good pattern right? It is why I currently have a beard... ITS THE PLAYOFFS AND THE WINGS ARE GONNA TAKE IT AGAIN!!! By the way I know it is a temp. gauge I am not completely absent minded when it comes to cars! I have checked most of the hoses and soaped them up but cannot find a bubbly leak anywhere!! I am going to try the turbo tonight, The nuts seemed tight but I have not checked them all... Thanks for the tip. Oh... Do you know if the adding "T" valves to the vacuum lines really adds boost pressure?? I just don't understand how that would work. Link to comment Share on other sites More sharing options...
strang3majik Posted May 18, 2009 Report Share Posted May 18, 2009 I tapped into each coil with volt testers and it is firing properly. even when it bogs down it fires properly. I didn't buy it because it is msd so it must be good... I have had msd coils on every vehicle i have every owned except my ninja, they have never failed on me and why change a good pattern right? It is why I currently have a beard... ITS THE PLAYOFFS AND THE WINGS ARE GONNA TAKE IT AGAIN!!! By the way I know it is a temp. gauge I am not completely absent minded when it comes to cars! I have checked most of the hoses and soaped them up but cannot find a bubbly leak anywhere!! I am going to try the turbo tonight, The nuts seemed tight but I have not checked them all... Thanks for the tip. Oh... Do you know if the adding "T" valves to the vacuum lines really adds boost pressure?? I just don't understand how that would work. it would work, since it makes the response to the wastegate actuator, delayed, therefore not opening as soon. But, don't be upping the boost til you find out your current issue. Soapy water would not be enough in itself, unless it was massive. Also, you may not have a leak until higher boost. Best bet would be to do a boost leak test. They make things to do it, or you can make your own....just search the site for some methods. Also, what gauge are you reading? If its the stock gauge, that could be terribly inaccurate, since its only an electronic guess, as to what boost you're running. Link to comment Share on other sites More sharing options...
Tommy29 Posted May 18, 2009 Author Report Share Posted May 18, 2009 it is an aem boost gauge analog style. I am going to fix the current issue before upping boost, I also have an aem wideband fuel air gauge and it reads normal until it cuts off the boost, then it goes nuts on the high end. Link to comment Share on other sites More sharing options...
strang3majik Posted May 18, 2009 Report Share Posted May 18, 2009 it is an aem boost gauge analog style. I am going to fix the current issue before upping boost, I also have an aem wideband fuel air gauge and it reads normal until it cuts off the boost, then it goes nuts on the high end. with an 87, you'll hit fuel cut at anything above 10 I believe...but, you say you're running a real gauge... Check your boost hoses. Step one. Also, as was said, might want to check you cat conv, to see if its clogged. Link to comment Share on other sites More sharing options...
Tommy29 Posted May 18, 2009 Author Report Share Posted May 18, 2009 the cat is new, i will still check it out but it is moslty open high flow from borla Link to comment Share on other sites More sharing options...
strang3majik Posted May 18, 2009 Report Share Posted May 18, 2009 the cat is new, i will still check it out but it is moslty open high flow from borla even the one right behind the turbo? Or is it an aftermarket dp? Link to comment Share on other sites More sharing options...
Tommy29 Posted May 18, 2009 Author Report Share Posted May 18, 2009 even the one right behind the turbo? Or is it an aftermarket dp? thats the one i am going to check, I might as well go open downpipe though since I will have it up on the lift tonight anyways to replace the muffler. I have never really dealt with a stock turbo motor before with a computer boost control, all my other ones were aftermarket manually controlled but i never ran higher than 15 psi and that was with a garret t3/4 hybrid on a 96 probe gt so it with plenty of support mods so it could take it. I am really mad about letting that car go but I got a good deal on it. Link to comment Share on other sites More sharing options...
strang3majik Posted May 18, 2009 Report Share Posted May 18, 2009 thats the one i am going to check, I might as well go open downpipe though since I will have it up on the lift tonight anyways to replace the muffler. I have never really dealt with a stock turbo motor before with a computer boost control, all my other ones were aftermarket manually controlled but i never ran higher than 15 psi and that was with a garret t3/4 hybrid on a 96 probe gt so it with plenty of support mods so it could take it. I am really mad about letting that car go but I got a good deal on it. thats the one that usually clogs and causes problems. Id check that one out. But, if you're planning on upping the boost, might want to consider swapping to an 88-89 computer, since its fuel maps allow higher pressures. Also, pair that with an 88-89 wastegate, and, itll be at 10psi, base. Link to comment Share on other sites More sharing options...
Recommended Posts