Boost problem, cant get over 3psi

NJ93TY

Donating Member
OK I did some searching but didnt really come up with anything that was helpfull. My truck was just painted and had a lot of downtime. I have installed a PTE-52 Turbo. RPM"s AtoA intercooler. I am using the OE wastegate because I wanted to start off with lower amounts of boost before I go beating on it. I didnt want to use the PTE wastegate that has an 18lb spring. Well I cant build any boost. Stock convertor and 50# injectors. 3" exhaust from the turbo back. High flow cat, ATR cat-back.

Thinks I double checked. The wastegate rod. It is tight and definately closed, its not slightly open or loose. I thought maybe I had a silicome coupler leaking so I double checked all of the clamps and they are tight. I pulled the air filter off and ran the truck and put my hand right over the turbo inlet. Thinking if there are any leaks I would hear them but I didnt, the truck shut right off. Thats normal. I then pulled the tube off the intake and while the truck was running reved it up and held my hand over the tube goign to the throttle body. I have some air flow but not enought to blow my hand off the tube because you really cant build boost at idle without a load on the engine. That seems normal, right?

Now when I drive the truck and get on it about 3/4 throittle I can hear the intake sucking hard like my ex girlfriend and when I let off the gas I hear the compressor backspin. This tells me(at least I think) that the turbo is spooling and should be building boost. I can only get about 3-4 lbs. I had my friend jamie stand in front of my truck while I power braked the piss out of it for like 4 or 5 seconds at a time. All he hears is the intake sucking sound, didnt see or feel any leaks on the intercooling pipes.

Boost solenoid is hooked up properly but regardless it should build boost even if the solenoid was not hooked up. I shoudl still be able to build like 8 or 10 lbs of boost if it was disconnected anyway, right?

If anyone has some ideas or thoughts on this it would be greatly appreciated. Or maybe someone has had similar problems or maybe thinks I should check something again. This is really the last issue with my truck before I can actually drive it this summer.
Thanks in advance guys!
 

silverblaz

Member
Re: Boost problem, cant get over 3psi

run your truck at idle

get a can of carb/intake cleaner

spray around all intake gaskets tb gaskets and anything that is under vacuum and if your truck stumbles or anything it will help pinpoint your leak make sure to concentrate on spots at a time because if you get trigger happy you wont know where you sprayed and where its coming from
 
Re: Boost problem, cant get over 3psi

the stock converter is way to tight. you will never build any boost off the line with it, and if you do you will lose it when you let off the brake. going down the road you should be able to get good boost but it will have lots of lag. take the exhaust off of the downpipe and run it that way and see what you get.
 

NJ93TY

Donating Member
Re: Boost problem, cant get over 3psi

Thanks for the tips guys, I will try both those idea's tomm since I will have more time then I did today to mess with it.
 

NJ93TY

Donating Member
Re: Boost problem, cant get over 3psi

OK guys just an update. I check for leaks today, none. Disconnected the exhaust, no different. Pulled a plug, black as coal. I was doing some more reading and research and figured out my chip is not set up to run the 50# injectors that I have. I turned the fuel pressure down to about 25, it was at 40. Drove it again and can get about 5 or 6 lbs of boost. I am goign to have to do some serioous tuning to get this straightened out but I appreciate everyone's help.
 
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