Looking to get a tune checked.. Breaking up under hard acceleration

[ITL Cobra]

Does it break up after you shift and start getting back into the throttle? Or at high rpm before you shift?

After I shift and get back on the throttle...

 

[C.Evans]

The best thing to do is re-create the event which is what they will do at a shop. Watch the wideband to see if it pegs lean or rich when it stumbles. I'm gonna guess it goes lean.

 

[ITL Cobra]

Brief Update..

So yesterday afternoon, I had a few hours free, so I replaced the plugs, replaced the COP's, replaced the FRPS, Installed the KB Disc, and replaced the fuel filter. Started her up to check for leaks and all seemed fine, took her for a short drive and noticed a slight whine "not in boost" gave it a few RPMS and the whine increased with RPM speed. Car is usually on a charger when not in use, so when I got home put her back on the charger and checked this am and its still not charged... I am thinking I might have a charging issue..

 

[Zack]

^^^^That is very possible.

If you buy an alternator, save your money and buy the only alternator you will ever buy again: I created this in my head and had Nations build it. It works:

Nation's Auto Electric Alternator Review

 

[Eagle]

Charging issues will definitely lead to funky problems. Getting it tested won't necessarily prove anything either. I had a bad alt test good on two different machines last year. Replaced it anyways and the charging issues disappeared.

 

[ITL Cobra]

Ok, after replacing the Alternator, with a 300amp Alternator, and a Optima Red Top Battery, Fuel Filter, COP's, FRPS, Plugs, and KB Disk, I took the car over to Modular Performance to check the tune... Turns out the tune was the issue, it seems all the mappings were off, not sure how that happened, as Bob K tuned it and put on 100 miles in 3 years and not changed anything...

 

[greasy]

Damn mang, why did you not check the tune first?!?!

 

[ITL Cobra]

The truth is, I would be like a monkey doing a math problem... Thats why I took it over and put it on the rollers, cause I would rather have someone who knew exactly what they were doing look at the tune.... I didnt want to hurt the motor, as the car only has 34xx on the clock...

I was hoping that I corrected the issue, as the battery did test marginal and there wasn't really a way to accurately test the alternator under WOT..

I wanted to make sure I took care of every option I could as I had to wait two weeks to get in at Modular Performance and them being as far away as they are from me I didnt want to go in and have them say that the alternator or the filer was bad...

 

[Marko]

Glad to hear you got it running right!!

I'm gonna take my cobra to Tim for a tune too.


So, he's really busy lately??

 

[ITL Cobra]

Glad to hear you got it running right!!

I'm gonna take my cobra to Tim for a tune too.


So, he's really busy lately??

Yea, there was a car being tuned before me, and before I was out the door he was putting another one on the rollers. I think he said it was still two weeks before the next opening.

 

[Marko]

That's cool. I'll call Tim Mon. morning