SR Hesitation at 3.5k+

[DLo Eric]

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?

[sliEighty]

check for boost leaks even a small one can effect the way it runs

[DLo Eric]

check for boost leaks even a small one can effect the way it runs

Yeah, I've switched out the piping completely with another sidemount I have. It still doesn't make a difference

[Kouki]

I had something very similar happening to my sr, changed the plugs, ran great after that. But yeah, I have a boost gauge, and it was spooling all the way up to 14psi like normal, but just felt like I had the brakes on, then if I lifted off the throttle, and really eased into it, then it would run out fine, I'd check your plugs first.

[sliEighty]

check the ecu for codes maybe?

[DLo Eric]

I had something very similar happening to my sr, changed the plugs, ran great after that. But yeah, I have a boost gauge, and it was spooling all the way up to 14psi like normal, but just felt like I had the brakes on, then if I lifted off the throttle, and really eased into it, then it would run out fine, I'd check your plugs first.

Changed the plugs in attempt to fix the problem. It's running NGK Iridium 7-heat range. Didn't seem to do anything.

check the ecu for codes maybe?

Not throwing any codes either, thats the first thing I did :/

[tt99ol]

try using regular bkr7e plugs iridiums seem to not run right ever also do you have an atmospheric bov it might be leaking

[attracted]

check for dirt in ur gas tank....pump might be on it's way

i had a similiar problem

[rightcoastimports]

sounds like a fuel problem.. if you dont have a walbro pump i'd get one in there.. they are under $100.

[srgabe]

you know what dude i got the same problem execept my slight hesitation is around 5000 rpm and up so i put a walbro and a sard fpr and still nothing i was running the same iridiums then changed to the ones the guy above suggested and still nothing idk what it is i was thinking maybe i need to adjust my afc??...so if you find out please lmk

[Sileighty_85]

Mines doing a similar thing when mine started it was throwing a code for the CAS but it went away, but im still thinking thats the prob and the CAS is out of spec

[smelly240]

I remember my car felt like it had vtec - turns out the stock timing is whack

[Luvs2slide]

you know what dude i got the same problem execept my slight hesitation is around 5000 rpm and up so i put a walbro and a sard fpr and still nothing i was running the same iridiums then changed to the ones the guy above suggested and still nothing idk what it is i was thinking maybe i need to adjust my afc??...so if you find out please lmk

Your SR won't make much power after 5500. After that the power band starts dying on a stock setup.

[makulit054]

Mine hesistated because my CAS wasn't plugged in all the way. Make sure your CAS is plugged in all the way.

[DLo Eric]

Mine hesistated because my CAS wasn't plugged in all the way. Make sure your CAS is plugged in all the way.

You know, I did notice the plug for the cas was cracked. It's plugged in, but is there a possibility that would cause to to hesitate at higher RPMS? Its constant throughout all gears. Any place where I can get plugs for the cas?

[posdriftin]

mine did the same thing also.. i cleaned the maf (lightly with brake clean) and cleaned the throttle body with a wire brush and carb clean.. then ran at high rpm for 15-30 seconds.. runs awesome now