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

ITL Cobra

Well-known member
Joined
Jan 31, 2007
Messages
470
Reaction score
1
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


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??
 

Zack

4 Doors 4 Life
Joined
Mar 21, 2004
Messages
6,295
Reaction score
5
Location
NW Indiana
What is the gap of the plugs?

I would gap an 18lb Whipple car at .027-.028
 

1MEANGT

Braaaaaaap!!!
Joined
Mar 18, 2004
Messages
8,288
Reaction score
51
I would e-mail Bob and maybe send him a datalog of the issue. He still supports all his customers here.
 

wolfe

in black sheep's clothing
Joined
Jun 2, 2008
Messages
17,508
Reaction score
25
Location
Si Oh Em Pee Tee Oh En
Go out to Mr Norms in Rockford. He has done a lot of tunes for people in the area and they have all been very happy with his results. Very nice guy (Tim) and professional work.
 

Marko

Well-known member
Joined
Feb 19, 2005
Messages
16,737
Reaction score
88
Do a search on SVTP and mod fords. I know I've heard of this problem before.
 

ITL Cobra

Well-known member
Joined
Jan 31, 2007
Messages
470
Reaction score
1
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...
 

Marko

Well-known member
Joined
Feb 19, 2005
Messages
16,737
Reaction score
88
I would change the fuel filter even though the car has very low miles! But, it also does sound like spark plug blow out.
 

blck10th

Well-known member
Joined
Jan 11, 2007
Messages
17,963
Reaction score
9
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
Joined
Feb 28, 2009
Messages
2,098
Reaction score
3
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.
 

blck10th

Well-known member
Joined
Jan 11, 2007
Messages
17,963
Reaction score
9
BR7EFS is what I have used with my old combo 2.3 and 21-22psi. that was on 100oct


never mind wrong cable. sorry i have the ones that connect to the wideband then to the handheld
 

ITL Cobra

Well-known member
Joined
Jan 31, 2007
Messages
470
Reaction score
1
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...
 

10thSVT_03

DRRRT PROSPECT
Joined
Feb 28, 2009
Messages
2,098
Reaction score
3
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.
 

ITL Cobra

Well-known member
Joined
Jan 31, 2007
Messages
470
Reaction score
1
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...
 

03GTGreen

Cobra Brigade Presidente
Joined
Aug 1, 2007
Messages
4,022
Reaction score
23
All that white stuff is detonation, no more beating on car till its retuned

Have you changed anything on the car at all since tune??
 

ITL Cobra

Well-known member
Joined
Jan 31, 2007
Messages
470
Reaction score
1
All that white stuff is detonation, no more beating on car till its retuned

Have you changed anything on the car at all since tune??
Went from a off road X to a hi-flow catted x.
 

gnxs

Corn-Fed Goodness
Joined
Apr 26, 2004
Messages
8,866
Reaction score
0
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

Well-known member
Joined
Feb 19, 2005
Messages
16,737
Reaction score
88
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


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.
 

ITL Cobra

Well-known member
Joined
Jan 31, 2007
Messages
470
Reaction score
1
^^^^^ Hans from Deans performance did the install...
 

raresvt

Well-known member
Joined
Sep 14, 2007
Messages
1,352
Reaction score
2
Yea, id start with new plugs and changing the fuel filter.
 

C.Evans

Well-known member
Joined
May 21, 2011
Messages
3,705
Reaction score
0
Location
Sycamore, IL
Does it break up after you shift and start getting back into the throttle? Or at high rpm before you shift?
 

Create an account or login to comment

You must be a member in order to leave a comment

Create account

Create an account on our community. It's easy!

Log in

Already have an account? Log in here.

Top Bottom