Mid throttle hesitation/Rich AFR Classic FAST:

[UR50SLO]

Hey guys...

Small problem that I need to track down.

Tip in throttle is ironed out.

But at mid throttle all the sudden the Injector duty cycle blips high and

AFR's go low.(rich)

Not sure what's causing it but it's not there if you "roll" into the throttle.

A quicker down on the throttle always seems to make it happen.

How low do we need to set our AE MAP Limit? I read that that can cause this

rich issue on our turbo cars.

Anyone else ran into this mid throttle rich blurp?

250CID Hyd. roller 214/218 Champion ported heads and newer champion

intake 83lb/hr inj. 76GTQ. 93oct. gas. TH400Trans.

Thanks for any tips,
Scott~

 

[UR50SLO]

I changed the decay rate for AE fuel higher and I think that solved it.

I'll drive it again later today for lunch and find out for sure. I can mash it now and it's fine. I'll see how it is from a 40mph roll.

I was really worried that I'd go to build boost on the line and it'd have that dead spot and die. That's fricken embarrasing. Lol.
~Scott

 

[SloGN]

scott i can send ya a copy of my run files to look at for a reference. i have 55lb injectors tho.

 

[UR50SLO]

That'd be helpfull... It's still there.

If I just "hit" it there's little or no hesitation. But if you try and take it
easy(ish) it about cuts off.

Thanks for any help,
Scott
UR50SLO@aol.com

 

[SloGN]

That'd be helpfull... It's still there.

If I just "hit" it there's little or no hesitation. But if you try and take it
easy(ish) it about cuts off.

Thanks for any help,
Scott
UR50SLO@aol.com

sorry about the delay but i have sent ya my run files via e-mail

 

[UR50SLO]

Got the file... Thank you!

I'll change some of the perameters one at a time and see if I can get that

glitch worked out. I know it was there last year but it was so minimal. This

time it's horrible. It's only in one area. Before and after it's fine. Wonder

if my TPS has a bad spot in it? Sure acts like it. I don't see it going flat

on the data log or anything.

I'll play with it later today and see what I come up with.

Thanks for your help!!!!

I went up to Martin MI Friday and on it's first full pass went

10.70@131mph on pump gas... Not a bad starting point.
~Scott