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Discussion Starter #1
I hit this fella up to find out if I could get better drivability out of my Gto.

Setup consist of
236/240 cam 110 lsa
Etp 215
Fast 102
Porter 90mm throttle body
Headers catless mids catback

Problem was under 2k rpm my driveability sucked!!

Constant bucking and surging.
Vehicle idled fine
Made great power
A/f was dialed in but would swing on the wideband


I tried everything from injection timing to running leaner to rich, +10* timing -10* timing and nothing worked!

Kept the car in open loop because fuel trims would never straighten out constantly adding fuel.

I sent this fella a log and my tune, he noticed I was lean based on o2 mv.
 

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Discussion Starter #2
Went back to closed loop
Disabled dfco cfco always kept ltft off
Enabled my stft

Retuned ve table part throttle with 2 20 minute drives

I was about 10% lean

After making the flash with new table
All of my sporadic part throttle knock disappeared
Drivability was about as good as stock!!!!

Felt like I picked up about 20 ftlb of torque

Now my Gto is fun to drive again not a pain in the ass for around town driving.

He's not the best tuner in the country for nothing !!!!
 

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Growing up is an option
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I'm amazed at the people that buy into the idea that low speed bucking is normal with a cam. A good tune makes all the difference.
 

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Discussion Starter #6
^
I agree

He did state that it would not drive like stock with a cam of my size and in honesty it does not drive like stock.

My car feels more stronger down low

Only way I can get her to buck now is by forcing her.

I also have a lightweight flywheel which does not help.


I have to relearn how to drive her right now because it behaves so much differently!!!
 

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antimatter man
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549 Posts
I would like to cruise in 6th gear @ 1100rpms. Any tuners wanna take a whack?? Oh yeah, I have a "Hellion" cam :gr_jest:
 

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80 swap in the works
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I'm amazed at the people that buy into the idea that low speed bucking is normal with a cam. A good tune makes all the difference.
Did you see he used stft to tune part throttle?.....



Ed is the man, I have learned a bunch from him by just reading his posts.
 

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i want a ride!
 

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Ed helped me out tuning my 408 in my old trans am when I lived in hawaii.... +1 he is awesome
 

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antimatter man
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You have your own software? If so, send me a log and the tune. [email protected] is my email.
Whoah! I simply didn't think it possible, what with all the lift/duration/overlap vs gearing in 6th.... In 6th I can cruise 1500 rpms all day long, 1250 rpms if I don't stab the gas... anything less than that and the car sounds/acts like I'm running a 7HP Evenrude outboard (TPHTHPHPTHPHPTHT) LOL. Other gears I can get lower than 1200 rpms so I never thought it to be a problem.

Not my my software or tune, but I should be able to get my hands on it.

edit *didn't meant to threatcrap on the OP... but I agree that a PROPER tune can do wonders
 

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80 swap in the works
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If it can be fixed in the tune ed will get it done lol.
 

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Discussion Starter #18
Post the spec of the cam
My issue was fuel related

Widebands don't seem to br too accurate for part throttle
Especially when they are lambda sensors
Spilit personality sensors lol

She still needs a little polishing
 
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