Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post

DLo Eric · 10-08-2007, 01:25 PM

Alright so I have a problem thats been bugging me for a few months.

Stock Blacktop SR
T25
HKS Hi Power 2.5''

When I would accelerate above 3.5k the car would more or less hesitate. There isnt any bucking involved. Just a bit of a slow down when coming to that point. Anything more than 15% throttle will induce the hesitation.

Maf has been changed out a couple of times
TPS is reading correct.
Timing is at -15.

What I'm feeling (no boost gauge) is full boost all the way even when its hesitating, it just doesn't want to move much faster.

The only thing I can think of is poor air flow at higher rpms considering the downpipe is 3'', gutted cat and the exit piping is 2.5''.

Now is there something I'm forgetting to check? or should I swap the 2.5'' on the car to my other 240's 3'' exhaust?

10-08-2007, 01:25 PM	#1
DLo Eric Zilvia Member Join Date: Apr 2004 Location: Las Vegas Age: 38 Posts: 245 Trader Rating: (2)	SR Hesitation at 3.5k+ Alright so I have a problem thats been bugging me for a few months. Stock Blacktop SR T25 HKS Hi Power 2.5'' When I would accelerate above 3.5k the car would more or less hesitate. There isnt any bucking involved. Just a bit of a slow down when coming to that point. Anything more than 15% throttle will induce the hesitation. Maf has been changed out a couple of times TPS is reading correct. Timing is at -15. What I'm feeling (no boost gauge) is full boost all the way even when its hesitating, it just doesn't want to move much faster. The only thing I can think of is poor air flow at higher rpms considering the downpipe is 3'', gutted cat and the exit piping is 2.5''. Now is there something I'm forgetting to check? or should I swap the 2.5'' on the car to my other 240's 3'' exhaust?