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LS3 Street Tune with issues under cruise. Hesitates / misses while cruising @ 1.5K

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LS3 Street Tune with issues under cruise. Hesitates / misses while cruising @ 1.5K

 
Old 06-18-2019, 08:30 AM
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boiler358
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Default LS3 Street Tune with issues under cruise. Hesitates / misses while cruising @ 1.5K

Hey guys,

So we street tuned my LS3 Grand Sport that has a BTR Stage 4 Cam and Intake.

Basically having issues while cruising. At 1500 rpm I will get a random miss / hesitation ever 5-10 seconds with steady light throttle. I can see my wideband fluctuate radically when this happens. Its pretty annoying and basically its like the car partially and momentarily falls flat on its face then it comes back then it repeats.

Under WOT the car pulls very hard and the AFR on my wideband stays at 12.

What are some things I should take a look at or rule out?

Much appreciated and would love to get this thing dialed in!
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Old 06-18-2019, 11:08 AM
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schpenxel
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Anything done intake / MAF wise? What do the MAF/VE/Dyn airflow look like? Are they smooth or bouncing around a lot?

Is the hesitation lining up with what fuel trims are doing?
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Old 06-19-2019, 08:04 PM
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Omega Doom
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ok so a street tune meaning pump gas correct? also is it a A6 or M6 ???
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Old 06-29-2019, 07:56 AM
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Check plug wires make sure all are seated all the way.
What tranny do you have? (If it's an auto fo you have a stall converter)

An uh that's a big cam which will require a lot of tuning.
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Old 07-12-2019, 11:56 AM
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post a datalog if you have one.
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Old 07-18-2019, 03:43 PM
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Spaceme1117
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If your car is an auto and you are on the stock stall, that cam is way too big.

Cam is probably too big even if it is a manual.

You can get to the same power (or very close) with a smaller cam and the car will be easier to tune and easier to drive.

Basically, I think your big-*** cam is the problem.


Last edited by Spaceme1117; 07-18-2019 at 03:50 PM.
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Old 07-18-2019, 07:55 PM
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Originally Posted by Spaceme1117 View Post
If your car is an auto and you are on the stock stall, that cam is way too big.

Cam is probably too big even if it is a manual.

You can get to the same power (or very close) with a smaller cam and the car will be easier to tune and easier to drive.

Basically, I think your big-*** cam is the problem.

BIG CAMSHAFT VS SMALL CAMSHAFT
lol this was more of a blind test at first he says he didn't know what kind of big cam was in it then at the end he claims it was a Vindicator cam seems more like he was out to sell his TSP spec cam as oppose to doing a true big vs small unbiased test
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Old 07-18-2019, 07:56 PM
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Omega Doom
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Originally Posted by boiler358 View Post
Hey guys,

So we street tuned my LS3 Grand Sport that has a BTR Stage 4 Cam and Intake.

Basically having issues while cruising. At 1500 rpm I will get a random miss / hesitation ever 5-10 seconds with steady light throttle. I can see my wideband fluctuate radically when this happens. Its pretty annoying and basically its like the car partially and momentarily falls flat on its face then it comes back then it repeats.

Under WOT the car pulls very hard and the AFR on my wideband stays at 12.

What are some things I should take a look at or rule out?

Much appreciated and would love to get this thing dialed in!
if you don't have at least a 3400 stall or higher than that is probably were the problem is
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