Hi, I have a boosted ls/vtec crx.
My normal whp on my car is around 425 whp on 23 psi.
It was a year since my last dyno and went to the dyno today and my surprise was on the same boost level I hit 340 whp.
It's the same motor, 190 compression on all 4 cilinders, tuning is good, but it's not doing more hp after 6500 rpm
The only change I made was to put a 2.75 inch piping infront of the turbo to the outside of the car. ( It's 2.5 feet long and comes outside the front left bumper).
Could it be possible that that piping is restricting the air coming into the turbo? I know the turbo sucks tremendous amount of air, but I don't know if this piping is blocking that. I just wanted some fresh air from the outside of the car. Any help would be appreciated. Thanks

 

Was it a different dyno? Plus what was the weather like last time you dynoed compared to this time? Theres alot of factors that could cause that.

 

Yeah, was it the same dyno? If so, that's a pretty huge gap, LOL!

 

Yes, it's the same dyno and it was kind of hot that day.

 

thats crazy, id like to know why that would happen.. id be furious.. bump

 

did you check to make sure vtec was engaging

 

Yes, it's engaging!!

 

huh?

dyno time is expensive but what i would do is get rid of the pipe. try a run. see if that helps.

are you running lean at all? rich?

 

I already got rid of the piping and another thing i forgot is that on the previous valve cover I had two hoses to a catchcan for the engine to breathe better, but I bought a type r valve cover and I didn't want to make the two holes for the lines to the catch can. Maybe is that also a problem? The block is B18B and doesnt' have the stock pcv valve.

 

you def need some type of block ventilation.

 

check for boost leaks?

 

Check the correction factor of both runs. My car makes 343 uncorrected, and 425 with corrected numbers for altitude and such.