MUSTANGBRKR02

iTrader: (91)

Seems like at about 2600+ RPM's the car cuts out and just stops till i get off the gas. Car is a 02 with dual in-tank 255's with 60lbers and a MP T70 with a 232/234 113 cam with 4l80e and 3400 stall. I am running stock rails with stock regulator for now and both pumps running all the time. I know this isn't optimum but i need to drive it for the next few weeks till i go with a return style and aftermarket regulator with a hobbs switch.

yarrie

when my car did the same it was the crank sensor/ crank sensor wire. I hope this help

MUSTANGBRKR02

iTrader: (91)

I will look at it but none of that wiring was touched or messed with.

yarrie

I pulled the center wire out of the piggy tail, it was still in but just not connecting. After i fixed it all was well. I pulled it out dropping the starter. Good luck

98Z28CobraKiller

iTrader: (17)

Why does your speedometer say you are going 158 mph? What is the max mph set too? You could just be hitting the speed limiter.

MUSTANGBRKR02

iTrader: (91)

I'm not sure why its doing that i just noticed that too. I will have to check. Would swapping the VSS sensors in the 80 cause this?

MY99TAWS6

iTrader: (3)

Tons of variables here to look at. Post your tune.
Was your car orginally an 4l60 or m6. if m6 assume you used conversion harness or are running full manual 4l80? If 4l60 assume you used proper harness and wiring.
You have 4l80 segment tune in there now also?
You should be ok to run stock lines and rails until likely around 600rwhp. Not sure how running stock reg works if it overuns bad with the big pumps. I have lonnies twin pump with adjustable reg,bigger rails and of 8an feed, 6an return and 60s for now going back to 80s or 120s when install upgraded turbos.
Maybe just some big mistake in tune.
I had problems with my car not wanting to go into boost it made machine gun noises and it was burnt wires .Happened a couple of times. Also you can blow out spark depending on boost so gapping to about .028 to .030 fixes that.tr6 are usually good starting point or heat range. Also have you checked fuel pressure?

MUSTANGBRKR02

iTrader: (91)

Going to check pressure in a few. The 80 has been in there for over a year. But i am trying a new 60 to 80 tune. I think i swapped the VSS connectors when putting the tranny back in.

MY99TAWS6

iTrader: (3)

Yeah seriously messed up on the mph. Again lets look at tune. And you are showing lean a lot on the afr if its correct. I would say your injector tune stuff is way out to lunch.

MUSTANGBRKR02

iTrader: (91)

That is a error i have some exhaust leaks all around the wide band. I know the tune is good it is a base tune from a sponsor here who has tuned many of these.

black98ws6ta

iTrader: (77)

Does it doing when you cruising in one of the upper gears? If so, I would try exceding those rpm's in the lower gears. I couldn't look at the scan right now but I would guess it is hitting the speed limiter. Running both pumps like that is very hard on them with stock lines and regulator in the back.

MY99TAWS6

iTrader: (3)

Ok .So tune should be fine then.And you have been running this for quite awhile assume with no problems.

I would say you have maybe reversed the plugs on the trans.

MUSTANGBRKR02

iTrader: (91)

Yeah as soon as the wife gets here i'll go try swapping them.

MUSTANGBRKR02

iTrader: (91)

Speedometer goes straight to pegged when moving.

black98ws6ta

iTrader: (77)

If it has been operating properly before then I think the wife needs to get home.

MUSTANGBRKR02

iTrader: (91)

Yeah she would be mad if i had the girls out there in 30 degree weather.

but i might aswell seeing as how the Patriots are sucking it up!!

Tzion_ben_Arthur

iTrader: (19)

Mine did the same thing just as I started going into boost. I put the plugs at .028 from .035 and changed the wires... that seemed to help enough to cause a trans replacement. The car is apart right now and I am going to move the gap to .025 before going back together. I had a few people tell me it could be the crank or cam sensor, but I did not log anything unusual. The afr was right on as was the timing. It felt like the rev limiter was kicking in, but I could bring it up to 3000 rpm in first and nail it. It responded beter then. It was when in load that the issue was worse. Keep us posted as to what fixed the issue...

MY99TAWS6

iTrader: (3)

Crank sensor usually causes no start no run . Cam sensor don't do much at all. It can make car not run that great but it will run,start a bit slower and it can make big injectors like my low impedence 120s not work .I had cam sensor problem that drove me nuts intermittent connector on sensor. Tach goes dead or intermittent with cam sensor issue as well.

Machine gun sound when going into boost is often as said wires or spark blow out.
.025 should be fine .028 to .030 should be fine too at would think up to 15psi anyway.

His problem sounds like it is hitting rev limiter likely because he has got those vss plugs backwards now.For sure something is wrong from his speedo reading weird like that.

Should be simple enough fix.

MUSTANGBRKR02

iTrader: (91)

Well that wasn't it. Now when i turn the car on it pegs instantly. I think i am going to burn it down.

MY99TAWS6

iTrader: (3)

So what did you change when it started doing this.I assume it wasn't doing this mph thing before? Maybe a speed sensor is gone bad. Or it still could be a connection /wiring issue to the sensor.
Did you convert 4l60 to 4l80 or was it t56 swap like mine? Sure nothing got whacked out in the tune.