2.9 whipple 2015 mustang suddenly became slow

[Mudhar17]

Hello everyone, I was doing pulls and all of a sudden the car became slower than usual. I used to run like 6.6-6.9 60-130 now it’s 8.4. No check engine light. I dont know whats wrong with it. it drives normally just slow at wot, kinda feels as slow as my na gen 1 mustang. where should I start looking? Guys I did a compression test all cylinders tested 195-200. The check engine light issue from previous thread was spark plug gap. Belt was changed by shop because it was smoking/slipping and still feels slow.

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[ice445]

Skip straight to compression test, start with the back 2 cylinders lol

 

[J17GT]

Can you data log it?

 

[Ruiner46]

Whipple tune? Make sure knock limiting is turned off

Nevermind, saw your other thread from May. Did you do a compression test like everyone else told you to do in the other thread?

 

[Mudhar17]

all cylinders are good 195-200

 

[Mudhar17]

Whipple tune? Make sure knock limiting is turned off

Nevermind, saw your other thread from May. Did you do a compression test like everyone else told you to do in the other thread?

Yes

 

[Johnny maverick]

Im a simple man. Belt slipping? Is that a thing with those air forcification gizmos? Lol

 

[Mudhar17]

Im a simple man. Belt slipping? Is that a thing with those air forcification gizmos? Lol

I’m at the shop rn so they can check that and the bypass valve

 

[Ruiner46]

Your log shows a bit of knock for the entire run pulling 3 degrees of timing, but aside from that, you are absurdly rich by the end of the run. The lambda hits 0.62-0.68 by the end of the run. The initial timing and final timing after knock are both on the low side at around 13 degrees. I would call this a tuning issue if you didn't say that it used to run well.

I guess that's your old log from the misfire issue? Can you post a new log?

 

[Mudhar17]

Your log shows a bit of knock for the entire run pulling 3 degrees of timing, but aside from that, you are absurdly rich by the end of the run. The lambda hits 0.62-0.68 by the end of the run. The initial timing and final timing after knock are both on the low side at around 13 degrees. I would call this a tuning issue if you didn't say that it used to run well.

I will upload a new log but it’s actually adding 4 degrees of timing. -4. The car used to run fine no tune changes, I doubt it’s a tune issue I sent the logs to the tuner as well and they said it’s fine

 

[JetGray_Mach1]

I will upload a new log but it’s actually adding 4 degrees of timing. -4. The car used to run fine no tune changes, I doubt it’s a tune issue I sent the logs to the tuner as well and they said it’s fine

Who is your tuner?

 

[Mudhar17]

Who is your tuner?

vmp, the car was dialed in beating modded gt500s Idk what went wrong.

 

[daSNAK3]

Boost leak?.. have a boost gauge?.. is it still hitting the same number as normal...

 

[Mudhar17]

Your log shows a bit of knock for the entire run pulling 3 degrees of timing, but aside from that, you are absurdly rich by the end of the run. The lambda hits 0.62-0.68 by the end of the run. The initial timing and final timing after knock are both on the low side at around 13 degrees. I would call this a tuning issue if you didn't say that it used to run well.

I guess that's your old log from the misfire issue? Can you post a new log?

attaching the new log

 

[Mudhar17]

Boost leak?.. have a boost gauge?.. is it still hitting the same number as normal...

I dont have an actual boost guage but I have the stock one on the display (vaccum/boost) 2015 cars only and it seems normal same as it was before. how do you check for boost leak

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