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

ITL Cobra

Regular
Jan 31, 2007
474
6
Car has 3200 miles on it, had the Whipple installed in 09 (with 29xx miles) and running 18lbs of boost, BAP and wiring upgrade, 60# injectors (Hans did the install). Due to work and family obligations I haven’t had much of a chance to drive her that much (ok at all), and never really got on her, really the hardest it was ever driven was on the dyno when Kurgan tuned it. 3 weeks ago had the coil over kit installed, ran the tank down to almost nothing and put in some fresh gas, got the car back, wanted to drive her around to blow the dust off her, drove it till I was back below a 1/4 tank, put in some fresh gas and was out screwing around a little not much, got on her a little around 5500rpm after 2nd and when shifting to 3rd she kind of broke up and sputtered fell on her face and then kicked right back up it all happened so quick couldn't see what the wideband was reading , so I backed off right away. So taking the path of least resistance 1st I decided to replace the plugs. Called lethal performance and they told me to go with the brisk Silver Racing Spark Plug (600hp+) for my set up.
Old Plugs
photo6.jpg


Installed the plugs... Ran the gas down to 1/4 tank again car runs fine under normal driving conditions filled her up got on her a little bit and she seemed fine.. Did a few more pulls and it seemed ok, but going from 2nd to 3rd under hard acceleration she broke up again...
I was going to do some data logging but I don’t want to damage anything...
Seeing as Bob is no longer around who is the next best to go to, to try and sort out this issue??
 

ITL Cobra

Regular
Jan 31, 2007
474
6
sent an email to Bob k and he seems to think its spark blow out and recommends I gap the plugs between .018 and .020. Been searching svtperformance, and came across a few that seems to have this issue, and the most of them pointed to the fuel filter?? With less than 4k does that seem possible?

I am am going to get a fuel filter and I ordered a serial to usb connector so I can data log...
 

blck10th

TCG Elite Member
Jan 11, 2007
17,965
24
sent an email to Bob k and he seems to think its spark blow out and recommends I gap the plugs between .018 and .020. Been searching svtperformance, and came across a few that seems to have this issue, and the most of them pointed to the fuel filter?? With less than 4k does that seem possible?

I am am going to get a fuel filter and I ordered a serial to usb connector so I can data log...

which x cal do you have? 2 or 3?

i will look I think I have one for each
 

10thSVT_03

DRRRT PROSPECT
Feb 28, 2009
2,153
50
Fuel filter could be bad and could also be a bad coil. I was having this issue also but with quite a bit more mileage on the car and replaced my coils. I would contact Tim Barth @ Modular Powerhouse/Mr Norms Garage and pick his brain or get on the rollers. I highly doubt that a smaller gap will take care of this only because if it didnt do that in 09 than why would it do that now? Also by closing up the gap wouldnt you need to update the tune? If its tuned for a certain spark,fuel etc. I cant see why just changing that would be doable. Maybe someone can explain that part. I also would be asking the tuner which plugs not Lethal. No offense to them but the tune may be rated for a specific range on the plugs.
 

ITL Cobra

Regular
Jan 31, 2007
474
6
Fuel filter could be bad and could also be a bad coil. I was having this issue also but with quite a bit more mileage on the car and replaced my coils. I would contact Tim Barth @ Modular Powerhouse/Mr Norms Garage and pick his brain or get on the rollers. I highly doubt that a smaller gap will take care of this only because if it didnt do that in 09 than why would it do that now? Also by closing up the gap wouldnt you need to update the tune? If its tuned for a certain spark,fuel etc. I cant see why just changing that would be doable. Maybe someone can explain that part. I also would be asking the tuner which plugs not Lethal. No offense to them but the tune may be rated for a specific range on the plugs.


IDK - That's what I was thinking too, The only thing I can think of is that when you are on the rollers going through the gears they usually do a pull, in what like 5 or 6th, not going wot running through each gear:dunno:

I am lost here...
 

ITL Cobra

Regular
Jan 31, 2007
474
6
Where are you located? We can always plug my sct in and datalog it to see what rpm your having issues and monitor everything. Helps to also have someone looking at the a/f ratio while your concentrating on the road.

I am in Willow Springs.. I appreciate the offer, with my work schedule I wouldn't be able to start on this till next weekend, maybe this weekend but doubtful...
 

gnxs

Electron Powered
Apr 26, 2004
8,930
256
sent an email to Bob k and he seems to think its spark blow out and recommends I gap the plugs between .018 and .020. Been searching svtperformance, and came across a few that seems to have this issue, and the most of them pointed to the fuel filter?? With less than 4k does that seem possible?

I am am going to get a fuel filter and I ordered a serial to usb connector so I can data log...
.018-.020 ??????????

NEVER heard of anybody gapping their plugs that tight with an 18 psi TS setup.. The fuel filter is a cheap experiment, no harm in changing it. :dunno:

Like others have said, I wouldn't be beating on it until you get it squared away.
 

Marko

TCG Elite Member
Feb 19, 2005
18,799
2,456
Car has 3200 miles on it, had the Whipple installed in 09 (with 29xx miles) and running 18lbs of boost, BAP and wiring upgrade, 60# injectors (Hans did the install). Due to work and family obligations I haven’t had much of a chance to drive her that much (ok at all), and never really got on her, really the hardest it was ever driven was on the dyno when Kurgan tuned it. 3 weeks ago had the coil over kit installed, ran the tank down to almost nothing and put in some fresh gas, got the car back, wanted to drive her around to blow the dust off her, drove it till I was back below a 1/4 tank, put in some fresh gas and was out screwing around a little not much, got on her a little around 5500rpm after 2nd and when shifting to 3rd she kind of broke up and sputtered fell on her face and then kicked right back up it all happened so quick couldn't see what the wideband was reading , so I backed off right away. So taking the path of least resistance 1st I decided to replace the plugs. Called lethal performance and they told me to go with the brisk Silver Racing Spark Plug (600hp+) for my set up.
Old Plugs
photo6.jpg


Installed the plugs... Ran the gas down to 1/4 tank again car runs fine under normal driving conditions filled her up got on her a little bit and she seemed fine.. Did a few more pulls and it seemed ok, but going from 2nd to 3rd under hard acceleration she broke up again...
I was going to do some data logging but I don’t want to damage anything...
Seeing as Bob is no longer around who is the next best to go to, to try and sort out this issue??

Just wondering, who gapped your plugs? Did they use needle nose pliers? Sorry I don't mean to change the subject. Back on topic.
 
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