sjones99

iTrader: (6)

Motor is 441 lsx and car will go to 7000rpm in 1st and 2nd but when you shift to 3rd and it gets to 6000rpm it starts to break up.I`m confused! Car was fine on dyno but has new problem as of last week.
Engine specs:
13:1 comp
lsx/ls7 heads with comp 921`s
251/266 110 lsa 623 lift
TH400
BS3
5000 stall

good2go

It's breaking up in the higher gear because you are loading the engine more, it's in a different part of the map. Try scanning the engine while in third, and check the A/F with a wideband if possible.

S10xGN

iTrader: (11)

That, or you're running out of fuel (pump)...

sjones99

iTrader: (6)

Doubt the fuel..have a lonnies twin pump and 85lb injectors..on dyno they were only at 30%

moge11

not a big enough line?? filter not flowing enough???

racerfox

iTrader: (4)

i say its in the tune

nmass399

What kind of fuel are you running, mine starts detonating after the shift to third and some to 4th when running 93.

sjones99

iTrader: (6)

Runnin vp110

nmass399

You could look at fuel pressure during a run, since its breaking up on you the wideband will be useless. I am not really sure what to tell you man, hope you figure it out. I still got to test mine out again to see if its fixed. I put vp 109 in mine and it was better but it seemed like it still had that hesitation after shifting.

sjones99

iTrader: (6)

figured out the issue...car had tr6`s gapped at 40...switched to 7`s gapped and 35...runs perfect!

nmass399

Good man, i thought about that at first for mine but just pushed that idea to the side. I got mine gapped at 60 on tr55's lol. Probably one issue for me.