O.K. I have my car running very well in vacuum again, after chasing some problems, but now I can't seem to make much boost. In 3rd at 4k I am barely making 5 lbs. of boost and rarely ever make more than 6 or 7lbs even at 7k rpms. That is usually when its colder. I make NO boost in 1st and little (2 to 3lbs.) in second. I know my waste gate is not leaking or opening early because I would hear it. My timing may be a little conseritive but not bad. Turbo has 4k on it. Plugs are new BUR9EQP's. I would like to hear all of the possibilities so don't assume any more than I have mentioned to be true.

Help please.....

 

What turbo ?.

 

62-1 with a 1.15 exhaust side. South Florida Performance undivided manifold, Haltech E6K, 550cc prims. 1600 cc Sec.

 

O.K. guys Im still suffering here. Somebody else must have had this problem. My 87' T2 won't boost like it should and I am getting a little restless. What, in my set up, would keep the boost down. Would too rich a condition? What about too lean? I do not have any detination. Coils and plugs are good but could I have some ignition problem. Sometimes in first above 6k and it acts like a rev limiter. Give me something to work with here.

 

check for vacuum/boost leaks.. maybe a loose intercooler coupler/pipe?

 

well your running a 1.15 hot side UNDIVDED on a nonported motor... switch out to a divided turbo and manifold or to a smaller hot side... spinning a big turbo like that with an undivided manifold... i just dont see it happening, hence explaining why you have little to no boost in 1st and 2nd..

 

Make sure your wastegate flange isn't leaking.

 

All good ideas guys, thanks. I will check the wastegate flange tonight. All intercooler hoses have been checked. Its what importbio22 said that has me thinking. I do have a street ported motor but I believe that its the large DIVIDED exhaust turbine housing and UNDIVIDED manifold that is the problem. I was to get a divided manifold but ended up with an undivided one and I just don't think they match up well enough to work. What could I expect with say a .81 or .96 undivided turbine housing? I know the .81 is small for top end but is .96 small enough to make a difference? I am ready to give up some top end for better response and more power up to 7k. Turbo experts, the floor is yours...

 

i ran a 60-1 with a 1.32 p trim rear on a stock unported motor with full boost by 4000, i think something else is a miss there, id be looking at the wastegate and intercooler pipes, check for leaks.

Dale