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Old 05-07-2012, 11:00 AM   #16
texas racer
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Default Re: car surges on the dyno... ignition problems?!

why would you mount the ignition ..in the truck?
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Old 05-07-2012, 11:28 AM   #17
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Default Re: car surges on the dyno... ignition problems?!

Looks cleaner and its closer to the battery which according to what I've read its better to ground the box right to the battery.
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91 mustang gt
Dart 427w 11.5:1
240 highports
IS 2 stage fogger
Fast XFI
Rossler TH400 (PTC converter)
505hp/430tq on 93
A little more on the jug and 110

Just a fun little street car
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Old 05-07-2012, 12:41 PM   #18
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Default Re: car surges on the dyno... ignition problems?!

The extension of the orange and black wires going to the coil from the box must be twisted like the trigger extension cord (green and purple) to provide as much EMF cancelation as possible. Those wires are transmitting and so they cannot be near the trigger wires.
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Old 05-07-2012, 02:32 PM   #19
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Default Re: car surges on the dyno... ignition problems?!

I'm not using the green purple or grey wires. Only the points and black/orange coil wires which run down the side of the car opposite any wires for the crank trigger or the xfi harness. Although I will twist the wires when i really do them in the larger size. It really doesn't seem like a wiring issue because that would be more intermittent. This only happens when the car gets high up and needs more fuel/spark. Its got plenty of fuel that's why I'm leaning more towards spark. It would be much easier if i could post the graph but all i have is a print out that they gave me. The horsepower curve is on a steady climb until about 2-300 rpm before it starts to surge at that point which is about 5800 the curve flattens completely then it starts to surge and by 6300 its bucking like hell but the really weird part is while its bucking it starts to build more power. Probably around 10-15 more.
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91 mustang gt
Dart 427w 11.5:1
240 highports
IS 2 stage fogger
Fast XFI
Rossler TH400 (PTC converter)
505hp/430tq on 93
A little more on the jug and 110

Just a fun little street car
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Old 01-07-2014, 10:12 AM   #20
327stkr
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Default Re: car surges on the dyno... ignition problems?!

whatever happen with this car?? I am having the same high rpm surging issues. I also have the msd digital 6 in the trunk. I am getting ready to order a hvc high voltage coil hoping this will fix the problem. I have burned up 5 tfi style coils.
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Old 01-08-2014, 09:16 AM   #21
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Default Re: car surges on the dyno... ignition problems?!

why are you mounting them in the trunk?
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Old 01-08-2014, 11:10 AM   #22
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Default Re: car surges on the dyno... ignition problems?!

Does this only do this on the dyno? Is it fine on the street or track? We had a similar situation two years ago on a dyno and thought it was the same thing (coil/box related). We eventually grounded the car chassis to the dyno with a heavy jumper cable and it went away. Since then the dyno owner drove a large ground stake outside the building and mega grounded the dyno. Had no issues since. I was one of a couple cars that ever did it on his dyno. I never had any issues on the street, but on the dyno it would buck and go nuts at about 5,800 rpms. I normally run 7,200 rpms at the track. I run a Digital 7 box, a HVC coil, crank trigger and FXi.

John
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1993 Typhoon AWD
262ci Bowtie V6, PTE 76mm
10.71 Video
Current Best: 10.61@ 132.5 mph.

1993 Typhoon 2WD Tube Chassis
282ci Bowtie V6, Twin PTE 62/65s
8.84 Video
Current Best: 8.84@ 154.42 mph. 22# Boost E-85
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Old 01-12-2014, 05:02 PM   #23
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Default Re: car surges on the dyno... ignition problems?!

I ended up putting the blue hvc2 coil and ran larger wires to it from the box (10ga I believe) and the problems went away. I already had the chassis grounded in multiple places with heavy cables to welded studs but I did add grounds between both heads then to the primary ground for shits and giggles.
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91 mustang gt
Dart 427w 11.5:1
240 highports
IS 2 stage fogger
Fast XFI
Rossler TH400 (PTC converter)
505hp/430tq on 93
A little more on the jug and 110

Just a fun little street car
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Old 01-12-2014, 05:03 PM   #24
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Default Re: car surges on the dyno... ignition problems?!

Windedv6... mine did it on the street also before I upgraded the coil and wiring.
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91 mustang gt
Dart 427w 11.5:1
240 highports
IS 2 stage fogger
Fast XFI
Rossler TH400 (PTC converter)
505hp/430tq on 93
A little more on the jug and 110

Just a fun little street car
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Old 01-13-2014, 03:18 PM   #25
windedv6
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Default Re: car surges on the dyno... ignition problems?!

Glad you have it cured.
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1993 Typhoon AWD
262ci Bowtie V6, PTE 76mm
10.71 Video
Current Best: 10.61@ 132.5 mph.

1993 Typhoon 2WD Tube Chassis
282ci Bowtie V6, Twin PTE 62/65s
8.84 Video
Current Best: 8.84@ 154.42 mph. 22# Boost E-85
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Old 01-13-2014, 04:22 PM   #26
Mike Beck
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Default Re: car surges on the dyno... ignition problems?!

Quote:
Originally Posted by texas racer View Post
why are you mounting them in the trunk?
I would never do that.
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Old 01-13-2014, 04:42 PM   #27
1clean91
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Default Re: car surges on the dyno... ignition problems?!

Quote:
Originally Posted by Mike Beck View Post
I would never do that.
Works great and looks clean. Just needed heavier ga wire for the extended distance. If you think about it there's no difference between mounting it in the trunk of a street/race car and mounting it in the nose of a rail car.
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91 mustang gt
Dart 427w 11.5:1
240 highports
IS 2 stage fogger
Fast XFI
Rossler TH400 (PTC converter)
505hp/430tq on 93
A little more on the jug and 110

Just a fun little street car
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Old 01-13-2014, 06:15 PM   #28
Mike Beck
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Default Re: car surges on the dyno... ignition problems?!

Yes there is, RFI/EMI issues. Most dragsters don't have EFI to contend with.
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Old 01-13-2014, 06:49 PM   #29
1clean91
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Default Re: car surges on the dyno... ignition problems?!

Well thankfully I nor several of my friends around here that have done it have those issues. Proper routing can ensure that those things don't happen either.
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91 mustang gt
Dart 427w 11.5:1
240 highports
IS 2 stage fogger
Fast XFI
Rossler TH400 (PTC converter)
505hp/430tq on 93
A little more on the jug and 110

Just a fun little street car
1clean91 is offline   Reply With Quote
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