Disclaimer. I dont have a boost gauge yet. i didnt when this occured. im getting one tomorrow.

So i have had my vortech kit on for about a month and went to the track on friday to see how i performed.. it was very hot and humid after i drove 30mins to the track, ~ 88* and 60-70% humidity. i parked for about 15 mins to bs with my buddies then i got in line against a guy from work who was running my old 00 maxima. we staged and i got a crappy launch ( like usual). just as i got to the top of first, which i reved higher than usual (6900 vs 6600) i felt an odd pop and the car didnt pull as hard as it was. the rest of the run felt slow as i wasnt getting the normal surge of power. that run was a 14.7 @ 97mph, which i was none too pleased with. i pulled back to the lot and looked the car over looking for anything obvious, to no avail. all i/c pipe couplers appeared tight, belts were tight. so i thought that perhaps i lost the vaccum line to the bypass valve. i looked the best i could and tugged on the line, but it still seemed tight.

so i decided to go for another run, same result. 14.6 @ 97mph. which is what happened all the rest of the night. even when i waited til it was cooler, the best run i pulled was a 14.5 at almost 98mph, which was .3 and ~ 2mph slower than when i was n/a. i was baffled. i have had no problems whatsoever with the kit since i installed it and ive gotten on it before.

FF to today. i pulled the car in and hooked a vaccum gauge to the line from the intake to the t-fitting for the fmu/bypass valve. sucked and held vaccum and the bypass valve was operating. i adjusted the screw and went from 5 to 7 threads exposed. so then i added another t fitting and installed my vaccum pump in line and i was getting proper vaccum at idle, and when id rev i would go to zero. so i decided to go for a test drive and i was able to see 4-5psi of boost in 2nd gear.

so im baffled. what could cause this problem just for one or 2 days? it was hot and humid on friday but its been just as warm for the past week and a half.

i noticed that the vaccum line from the intake to the fmu/bpv had a coupler with a check valve in it. im assuming that it wasnt from the normal kit as there was no mention of it in the install directions. do i need to maintain it?

i have an 05 revup sedan with a vortech full kit with a 3.12 pulley and unichip. i also have full exhaust.

 

bump.......

 

Wow, isn't 14.6 what the car runs stock? Check your compression. The G is known for bad seals and bad rings..

 

its not a motor issue. oil level is fine and no smoking.

 

boost leak?

 

^^ seems pretty low for a vortech.

 

I would do a compression test just to make sure, if you felt a pop and noticed a loss of power something is going on. Do you know the max boost from your dyno runs? That would give you a before and after now that you have a boost gauge