I have been lossing boost at like 5500 rpm in 2nd gear down to like 5-6 pounds. Stock pulley idk what it could be spark blowout maybe? Or belt slip but its stock besides cold air, mid pipe, and cat back.
Thanks, Joe
Thanks, Joe
Losing boost
- Thread starter 2003 Cobra Kid
- Start date
TORQJNKY
Active Member
Hey Joe, do you have an aux idler? Also check to see where your tensioner is sitting at. Sounds like belt slip to me. I also sloved a boost loss issue by going from the JLT CAI to the RAI.
Hmmm... Did you buy it new? How many miles are on the car? I would say belt slip, I don't think it would be spark plug blow out. Does the car hesitaite as you're trying to accelerate?
Boost should not be a factor in deciding which intake is best for your application
Power is what's important
You want to make the most power with the LEAST amount of boost
.
no did not buy the car new and has 74000 on it now, have an aux idler in my room but not on car yet, and it does not hesitate when accelerating so seems like belt slip
Well if the car has the srtock pulley i'm assuming it still has the cover, there is a possibility it has a lower but highly unlikely. My vote goes with belt slip, with that many miles you should replace the belt anyway. I'm sure it'll cure your issue. FWIW if you do have the guard on you will have issues putting on that aux idler lol I wouldn't worry about putting on that pulley until you replace the blower pulley and have it tuned.
Josh
Josh
Like JB said, check for visible signs of belt slip. If you've got slippage you should find belt dust deposits.
Check your boost bypass also, if it's not closing fully at WOT you could be leaking some boost.
how do you solve that problem I'm also losing about 3PSI I put on a even tighter belt than when I got it tuned and at the tune it made 15PSI???:shrug:
are your heads in good condition, may be the valve guides/seals are going bad and boost is escaping from there:shrug: is there anything out of the ordinary like stalling, smoke, noises???
Well the only way to check it at WOT would be on a dyno, but you can see it on the side of the blower. Under WOT watch to make sure the lever stays down on the bolt, closing the hole and not letting boost leak. If it creeps up at all then it might be letting some leak. Unscrew the two bolts that hold it on, push the cylinder down a bit then tighten the screws back. How do you know you are losing boost?
I only see like 11-12PSI on my guage, and I was at 15PSI when I got it tuned:shrug: my car pulled beautifully made 460/491 now i feel like I have 400-410 and just like 2 days ago my I gave it nearly full throttle got like half way on boost as I was accelerating to get into freeway and it felt like it cut off almost like if I hit the brakes:shrug:then it picked up again
It's been going on for a while, the whole 15PSI 460/491 only lasted like 2-3 weeks after the tune:fm::bash:
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