BoostedBoxer421 Posted April 21, 2014 Share Posted April 21, 2014 so ive searched all I could on this and have gone over a lot of different possibilities of what it could be; new plugs, wires, cap, fuel pump, fuel filter, throttle position sensor, coolant temp sensor, and MAF sensor. I haven't changed anything recently except for putting a new up-pipe to turbo to replace one with broken flange. it spools up just as fast but it seems like I'm not getting any power from the boost, almost like its bogging down.. if I floor it at 60 in 5th it slows down, but if I ease into it I barely have the same acceleration as my brother's weberized ea82 Im stumped here and can only hope its a mystery vacuum leak somewhere lol any suggestions?? Quote Link to comment Share on other sites More sharing options...
Gloyale Posted April 21, 2014 Share Posted April 21, 2014 Is the seal of the intake boot to the turbo good? You could have an air leak before the turbo.....builds pressure....but pulling in the air from the leak rather than through the MAF......throws off the readings.......ECU doesn't deliver enough fuel for the given RPM/boost/load. Quote Link to comment Share on other sites More sharing options...
naru Posted April 21, 2014 Share Posted April 21, 2014 suggestions??- Measure the fuel pressure under boost conditions What year we talkin? Are you actually seeing boost pressure on a gauge? Did it run better before the pipe swap? Slowing down at 60mph after flooring the throttle sounds like the knock sensor is pulling timing back possibly because of low fuel pressure/poor fuel. Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted April 21, 2014 Author Share Posted April 21, 2014 Ill have to find a way to measure fuel pressure, but just got new pump and filter a few k miles ago Its an '87 1/2 GL turbo And no boost gauge, but light comes on and I can really hear it spool up with open air box.. and it ran a little worse before because the flange to turbo was ripping off Quote Link to comment Share on other sites More sharing options...
naru Posted April 21, 2014 Share Posted April 21, 2014 The light means 1 psi IIRC.Not much.You want 7. Tee a pressure gauge into the wastegate "vacuum" line to get a measurement. Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted April 21, 2014 Author Share Posted April 21, 2014 Kinda off topic, but where you said to T in a pressure line on my 87.5 GL the line goes from wastegate to selenoid then back to turbo.. and on my 87.1 RX it goes straight from wastegate to turbo Is there different boost cut off or just different vacuum locations? Quote Link to comment Share on other sites More sharing options...
naru Posted April 21, 2014 Share Posted April 21, 2014 OOPS- forgot about the solenoid on later models Put the Tee between the solenoid and the manifold. That way the gauge will see manifold pressure. Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted April 21, 2014 Author Share Posted April 21, 2014 alright thanks, i'll try to check that later today and let ya know and it should be like 7-8psi under full boost right? Quote Link to comment Share on other sites More sharing options...
naru Posted April 21, 2014 Share Posted April 21, 2014 Yes,7 psi at full boost. Quote Link to comment Share on other sites More sharing options...
jono Posted April 21, 2014 Share Posted April 21, 2014 man, you can measure boost direct at the inlet manifold take offs on my EA82T, but is not an 87.5. It is 85 modl and its boost light comes on at 2 psi. as you found , could be a few things, blocked cat ? This only happened when you fitted another exhaust and that was the pipe from left, to righ to turbo ? They do differ in the size of the hole in the mounting flange from about 36 - 42 mm. My 87.5 that I am yet to try a boost gauge on - at the manifold - runs a 36mm which I am pleased about. The smaller the hole to a point, the lower the torquey boost comes in. I have also run a 42mm one where it seems to be slow coming , then a great rush all of a sudden and would spin way more freely to 6500. Can you drop your broken orignal in to an exhaust shop to have them repair it and try it back on car ? Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted April 22, 2014 Author Share Posted April 22, 2014 still trying to get a gauge to check manifold pressure.... I did think it looked bigger, but I didn't measure it.. will the bigger up-pipe ruin top end?? like accelerating from highway speeds? there is quite a rush of air n power in my low end now, and it seems to drop power around 4500 rpm.. so I welded up my old up-pipe and i'm just gonna throw that back on and see if theres a difference... and knowing how turbos work I wouldn't think that a bigger header would take my top end away, so i'm gonna swap back and see how it runs is there a way to check if that 3-way cat at the front is plugged? or just chop it up since I have another one on my not running RX (exhaust is cut off at the first big cat that's on turbo) Quote Link to comment Share on other sites More sharing options...
scoobiedubie Posted April 22, 2014 Share Posted April 22, 2014 Either one of two loose pipe clamps will cause this problem. All you need is ears in order to hear the high pressure air shooting out from under your hood. The two pipe clamps are both attached to the short rubber sections that attach to the bottom of your bright & shiny 4WD TURBO aluminum manifold on top of the engine. All you need is a phillips screwdriver to fix this problem. Essentially, you have a leaky/loose connection between the turbo and the intake manifold. It has happened to me when I forgot to secure these two clamps after working on the engine. Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted April 22, 2014 Author Share Posted April 22, 2014 (edited) its definitely not those clamps on the intake, ive been over those a lot looking for the problem the air sound is coming from the open air box for sure im thinking its to do with timing, fuel pressure, or vacuum somewhere Edited April 22, 2014 by BoostedBoxer421 Quote Link to comment Share on other sites More sharing options...
wagonist Posted April 23, 2014 Share Posted April 23, 2014 Did you say you've got a bigger up pipe now? How much bigger? Cos bigger diameter with the same flow volume = less flow speed, which means less speed pushing onto the turbo blades. Tho if you haven't changed the turbo, then that hole will be the same size. Just spitballing here, not really sure if this would have any effect or not Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted April 23, 2014 Author Share Posted April 23, 2014 Jono said they vary from 42-36mm and the one I swapped on looked bigger I was thinking that a bigger up-pipe would give more flow through the stock turbo in the top end.. but now I want my quick spool up and low end torque back from the smaller up-pipe Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted April 23, 2014 Author Share Posted April 23, 2014 would a coolant temp sensor or something to do with warming up cause my problem? i had to leave early this morning, so my engine was still kind of cold once i got to the highway. it seemed like it was running perfect, like accidentally doing 75 just cruising in 5th but by the time i had gone about 5 miles and the temp gauge was at almost 1/3 i had same power loss, and in town while cruising at like 30 in 3rd it misses every once in a while Quote Link to comment Share on other sites More sharing options...
scoobiedubie Posted April 23, 2014 Share Posted April 23, 2014 What year it your GL10? The missing could mean that your distributor is about ready to fail. The 85's and 86's have problematic distributors. Better find a spare, a timing light and enough tools to change it out, in the middle of nowhere. Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted April 24, 2014 Author Share Posted April 24, 2014 Its an 06/87 GL wagon with part time AWD I was thinking the timing was off but last time I checked it was fine, and it only seems to run bad under boost. I plannned on swapping the distributor and some other stuff from my parts car and see how it works Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted April 24, 2014 Author Share Posted April 24, 2014 could my problem be from putting the wrong coil in for a little while??? Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted May 20, 2014 Author Share Posted May 20, 2014 so i swapped coil and the little square thing under it and it runs great now but its making about 9-12psi boost through 1-3 gear then its a steady 9psi in 4th and 5th Quote Link to comment Share on other sites More sharing options...
jono Posted May 21, 2014 Share Posted May 21, 2014 Aha, WOW ! And thanks for coming back in to finish things off, but your other post is with same car, just diiferent symptom ? Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted May 21, 2014 Author Share Posted May 21, 2014 yeah i know!! i thought these little turbos only made like 8psi max boost. the boost seems to be more regulated to like 9-10psi now that i have a better exhaust gasket off of the turbo, but if im rallyin' off-road it'll make 12psi at 3k rpm in 1st and 2nd.. could the little bit higher boost off of the stock tuned everything cause problems? and i just have open exhaust off of the first big cat and my intake box is opened up and yeah i just have the one good EA82T fer now.. do you mean the gas gauge problem post?? Quote Link to comment Share on other sites More sharing options...
jono Posted May 21, 2014 Share Posted May 21, 2014 I do mean the gas gauge post. No idea how a turbo feels with no more back pressure than a cat ...may be your problem there ?? Quote Link to comment Share on other sites More sharing options...
angerthis Posted May 22, 2014 Share Posted May 22, 2014 do any of you have vacuum diagrams for my 1986.1 Rx like turbo and evry thing els under the hood? Quote Link to comment Share on other sites More sharing options...
BoostedBoxer421 Posted May 22, 2014 Author Share Posted May 22, 2014 No, sorry. Im still doing the vacuum om my 87.1 RX the hard way as of about 10 min ago i have 2'' exhaust from the bottom of cat and goes to a turn down just past the back tire, seems to run smoother now, just a little less bottom end power i think. and can really hear tha little turbo spool up hella quick now it seemed to still run pretty good without any exhaust on after the cat, and the wastegate was still workin normally. with a 3'' tip on the cat I kept havin people in Chevys and big Deisels revving up at stop lights thinking i was wanting to race... lol and they thought they could beat me Quote Link to comment Share on other sites More sharing options...
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