6200+rpm car turns off ish.

[91CoupeMike]

Pretty sure it's just the fuel cut. But is it slow acting? I've never hit the limiter before atleast not like this. Twice this week if I rev it out and shift the car turned off for what seemed like a full second and came back on and ran fine.

The other day I did a test launch and it broke the tires loose hard enough it hit the limiter and shut off again. Lol

Remove factory limiter in the tune and run a stand alone ignition? Need to do that anyways.

Thoughts?

I've heard the fox ECM turns off after 6250. Is this that?

[Mach1]

I've heard the fox ECM turns off after 6250. Is this that?

Sounds like it

[dsrtuckteezy]

why dont you just learn to shift at the proper time? the cut out is probably saving your dumb ass from trashing the motor!

[BMCSean]

Needs more nitrous!!!

[Mach1]

Post your dyno graph please.

[91CoupeMike]

why dont you just learn to shift at the proper time? the cut out is probably saving your dumb ass from trashing the motor!

On the shitty launches you're right.

I was shifting a little after 6k and not lifting completely.



It shows it doesn't make power after 5800 but I shift a little after so it doesn't drop in power to bad in the next gear. It feels strong after 5k.

[91CoupeMike]

Some say something is wrong after 5800. But it feels smooth.

[MattB]

You should bring that bad sumbitch up to Oklahoma and take-on the Street Outlaws. Make sure you do some test hits first though.

[Blue88Coupe]

You should bring that bad sumbitch up to Oklahoma and take-on the Street Outlaws. Make sure you do some test hits first though.

He already said he was doing test hits in the first post.

[91CoupeMike]

He already said he was doing test hits in the first post.

I'm sure that's what inspired the comment.

[Mach1]

looks like you are losing control of the valvetrain up top, what valve spring seat and open pressures?
What trans gear ratios?

[91CoupeMike]

• Valve Springs:
1.470 Hydraulic Roller Valve Spring -
CC 987, 125 lb Closed, 325 lb open,
1.900 Installed Height
.575 Maximum Lift

Stock t5
3.35 1.93 1.29 1.0 0.068

[Mach1]

• Valve Springs:
1.470 Hydraulic Roller Valve Spring -
CC 987, 125 lb Closed, 325 lb open,
1.900 Installed Height
.575 Maximum Lift

Stock t5
3.35 1.93 1.29 1.0 0.068

Duals are heavy, I'd run more spring in a dual or similar spring rate in a single beehive.

RPM drop
1-2:2600
2-3:2000
3-4:1400

I'd def run it all the way to 6200 for the best performance even with the top end drop, but i'd be worried about the valvetrain with what I see on the graph.

[91CoupeMike]

I should pick up some power with better springs.

I think it would make power after 6k with the top end I have. Systemax is good for it.

[91CoupeMike]

How do I determine what spring would be best?