car hesitates when hard acceleration between 1-2.5k rpm

[afluffy]

Driving the car normally car drive fine.
Problem I’m having is when I give it full throttle/ hard acceleration and I’m in 1-2.5k rpm car hesitates/studders/ bug out. After I going up to 3rpm car goes and response right alway. I did my spark plugs coil pack all 8 of them and currently all I have done is catless exhaust system valvetronic design and have a bpm tuned stage 2

https://youtube.com/shorts/tIzU4abDLWE?feature=share

[Redd]

My friend recently went thru the same issue. He had just put on a custom valved exhaust with stock tune. When he put the stock exhaust back the problem went away. Try that first.

[afluffy]

Problem is don’t have stock exhaust no more

[Redd]

How long have you had the current exhaust and BPM tune? When did you start noticing the hesitation?

Does it also happen with valves open/close?

[DrFerry]

Originally Posted by afluffy

Driving the car normally car drive fine.
Problem I’m having is when I give it full throttle/ hard acceleration and I’m in 1-2.5k rpm car hesitates/studders/ bug out. After I going up to 3rpm car goes and response right alway. I did my spark plugs coil pack all 8 of them and currently all I have done is catless exhaust system valvetronic design and have a bpm tuned stage 2

https://youtube.com/shorts/tIzU4abDLWE?feature=share

When you say you did the spark plugs and coil packs - all 8 of them.. Did you install the OEM NGK LKR8AP Spark plugs or something else? Did you install the OEM Bosch coil packs or something else?

Is the new exhaust catless or with high flow cats? Because the BPM Stage 2 tune you mentioned above is typically matched to the type of exhaust cats being used..

Try turning off completely the traction control (to do that hold down DSC button for 2 seconds) and see if the hesitation behavior is reduced.

Other members have reported hesitation with non OEM coil packs and when using aftermarket non NGK OEM plugs such as Denso, or Champion.

[spammysammich]

Also, does the new exhaust change the position of the X in the piping? Forward vs rear x has been known to impact drivability

[afluffy]

I bought those and I’m catless

[Redd]

There you go. The problem is your exhaust with the forward x merge.

[ganz]

Have to agree with Redd. You should contact Alpine or Epic Motorsports for a tune, and let them know you have a forward X.

I had a BPM with ESS (also forward X). The Epic tune made it drivable again.

[DrFerry]

Originally Posted by ganz

Have to agree with Redd. You should contact Alpine or Epic Motorsports for a tune, and let them know you have a forward X.

I had a BPM with ESS (also forward X). The Epic tune made it drivable again.

Great info and post from you and Redd. There are so many knowledgable people on this forum who are willing to help others. Well done.

[afluffy]

He guys sorry I didn’t let you guys know if I got the problem solve right alway once I did. I damage my ecu when I was flashing the files so i need to ship it to epic Motorsport.long story short i got another ecu the he send me in the meantime until he get my fix up. Now for the solution……… I got the Epic Motorsport tuned I explain about the x pipe being forward. He said me one ecu the he tuned him self problem was still their I explain him one more time and he understood the assignment. He got to work and like I’m an hour send me another files for the car. Now it drive like a dream…😄😄😁😁😁 so epic Motorsport it the way to go if you got a x pipe being forward. Thank all of you guys to help me out get my problem resolved 👌🏻👌🏻👌🏻👌🏻👌🏻👌🏻

[afluffy]

https://youtube.com/shorts/VRIJejw_tew?feature=share