Hey guys just got my turbo all setup and for some reason I am not boosting. I think its because the cat is clogged (it smells like eggs too). My question is if I gut the cat will it cause my engine light to turn on and go into loop mode?

Alex Fernandez
95 Turbo

Your car will boost even if the cat is clogged, that has nothing to do with the turbo spooling (well, not much). The only thing I can think of is that the wastegate is open for some reason.

Alex why dont you get Jason to look at it..............

ohh about the cat I did mine and my o2 didnt go off......

I gutted the cat and still no boost. I think that spdracerut is right. I am going to check my wastegate this after noon to see if it is stuck or something along those lines.

Alex
95 Turbo w/out BOOST

I found out last night why I wasn't boosting after pulling apart the turbo and valve cover. My timing chain jumped a tooth on the exhaust side and was opening the exhaust valves to late and the intake vlaves to early. Also my timing was at like 28 degrees. Crazy thats why my ideal's been all messed up. Hopeful tonight I'll put everything back togther and give her a shot of some boost.

Alex

damn dude, you seriously F'd shit up! way to go :) how did you get it to skip?

Okay this is really starting to piss me off. I still have no Boost I checked the things I thought it would be. Leaking intercooler/piping, timing, vacum leaks, turbo shafts, wastegate, valves, timing chain, cams/gears, and I don't know. So now I am praying to the turbo Gods for help. PLEASE HELP........................

Alex:confused:

Some things you might want to check:
Have you tried spinning the turbine/compressor blade by hand (if you can) to see if they are free flowing? Also, did you make sure the wastegate is not stuck open which would bypass all the exhaust gases around the turbine blades and prevent boost buildup. I thought that if you connected the wastegate wrong, it would open up on vaccum instead of boost! Just speculating...

-saaby

I checked the turbo yesterday and I was able to move the fans. See the funny thing is that there is air being blown into the intake manifold. Makes no sense that its not decting boost. Its like the ECU does not want to read it. Could the ECU be jacked or the 50lbs and need for fuel from the fuel pump (I still have the stock fuel pump) or does that matter. Now I am at the point where I'll do anything to get this thing running.

Alex

See the funny thing is that there is air being blown into the intake manifold.

I am assuming that you have a boost gauge installed. If not, I would install one immediately before I try anything else. It should be very definitive in letting you know that there is positive pressure in the manifold (boost). Does that indicate you are making any boost? What are you doing about fuel and ignition management. Are you stand alone or JWT ECU?

-saaby

I have a boost gauge installed and stays around -20 then at full throttle it goes to zero and stays. I have the JWT ecu with s3 cams, 50lbs msd injectors, cobra maf, and thats it.

Alex

Hmmm, the reading of 20 units of vaccum at idle is correct. So the boost gauge is more than likely reading correctly. There is 2 things that I can think of that is NOT happening. 1) Boost is not created. 2) It's created but it's not getting to the manifold. I would check this by reading the MAF voltage readings to see if it's changing enough which would indicate the turbo IS creating boost but its not getting to the manifold. If the readings are not changing much, then the turbo is probably not creating boost. You can rig up a multimeter to the MAF to do this. Another thing that you can try which is unorthodox/dangerous is to disconnect the wastegate line to ensure it stays closed...it could be that your wastegate is toast and somehow stays open all the time.

PS - I am assuming that the ECU is programmed for the cobra MAF and 50 lb. injectors. Although that would not have any affect in BUILDING boost.

-saaby

Another thing you should do is try a different wastegate and blowoff valve...these two things could be staying open which would inhibit boost.

-saaby

I unplugged the wastegate and no luck. I am going to check the voltage on the maf today and tps. I am also going to put a mach. boost controller on and try to change the boost settings.

Alex

Hey,

I was just wondering if you found out what the problem was? I was also thinking...the blow off valve probably would not inhibit boost.

-saaby

Dude I putting SDS on there now. I found out what the problem was I had a leak in my fuel rail. I fixed that and everything worked. I also put a 85 Volvo 240 DL external fuel pump and it kicks ass now.

Alex
95 Turbo

So you weren't making boost since you were low on fuel?...Hmmm, I can't make any sense out of that. If enough fuel is making it in the combustion chamber to make the car run through the gears, you would be creating a load on the engine which should have created boost. That doesn't make any sense to me...:confused:

-saaby

wouldnt your car run lean as well? :confused: