Rep Power: 0

i have the upgraded sf turbo on an auto civic. from every thing that i have seen/read fwd should be best at a roll but with my civic i cant seem to build boost past 25 mph.

if i floor it from a stop (example going onto a expressway) i have full power all the way untill i get to 70 (when i take my foot off due to im at my crusing speed).

i know a bigger turbo takes longer to spool but i should have some hp from a roll right?

 
Rep Power: 285

Maby You have a vaccum leak somewhere? Or a broken wastegate?

 
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if i had a leak wouldent it be there the whole time from a stop or a roll? i will chex into the broken wastgate thing

 
Rep Power: 284

How is your idle? Smooth, rough? If you have a vaccum leak, your idle will be killer. Check all your couplings. You may not have a vac leak, but a boost leak. I was entering the highway one night WOT at full boost then KUNK!...0psi....not boost...nor could i build any. I pulled over in a gas station and checked the probem. The pressure had blown the downdraft coupling off of my throttle body. All i had to do was re-attach it and tighen the clamp firmer. Maybe you just have a mild boost leak somewhere from the compressor->intercooler->throttle body.

 
Rep Power: 284

Double check your vaccum connection from the compressor to the wastegate. Internal, right? I strongly doubt its a broken wastegate though. Mostly when a wastegate goes, you'll build insane amounts of boost because the gate isn't opening.

 
Rep Power: 0

That sound like a boost leak. vaccum leaks ur rpm would be jumping up and down like crazy. If you have a boost & vac gauage. On idle the vac should read @ 20.

 
Rep Power: 285

oops i was wrong. don't listen to me.

 
Rep Power: 607

i don't understand what you mean..........are u saying that you if you floor it u build boost, but once you hit 25mph u loose all boost

 
Rep Power: 607

happened to me too.......pipe blew right off of the TB......... hairspray is a wonderful thing

 
Rep Power: 284

I idle @ -22mmhg

 
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no if i try to accelereate fast from a roll over 25 most of the time i have no hp gain other then stock.

my car is a little more ruff then it used to be but nothing to bad at idle

 
Rep Power: 284

do ya have a boost gauge? If you do, check to see if you're building boost. If not, then it's def. a boost leak. If you're building peak boost, then you might be running extremely lean. My ICU re-setted for no friggin reason last night and went down to my extra injectors only spraying 0.4Ms in every boost setting, when they were normally running 9+Ms @ 1psi, 10+Ms @ 2psi, 12+Ms @ 3psi, etc, and up. It ran so lean the car ran worse at 6psi then it did at 2psi. Do you have an a/f ratio? If not, best to get one, as CrewChief so bluntly put it, "Don't go pissing in the dark!"