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Tuning / Diagnostics -- engine and transmission Tune and diagnostics for engines and auto transmission.

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Old 12-23-2009, 10:12 AM   #1
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Disappointing Superchips numbers

Disappointing numbers after Superchips tune
2SS/RS L99 A6. Only mods are Superchips tune with AFM disabled. I was expecting somewhere in the 330's RWHP
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Victory red 2SS/RS, Superchips tune w/AFM turned off. 322 RWHP, 335 RWTQ

2SS/RS L99 A6. Only mods are Superchips tune with AFM disabled. Although I didn't get numbers before the tune, 322 RWHP seems about average for BONE STOCK.
And whats with the cavernous drop in torque between 2700 and 3700 RPM?
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Old 12-23-2009, 10:23 AM   #2
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Have you tried the fuse pull yet, my friend?
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Old 12-23-2009, 10:34 AM   #3
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I've read about that but don't suspect that to be an issue though. The complaints I've read from people doing that were about feeling a lack of power. Seat of your pants gauge says plenty of power and with T/C disabled will break the rear end loose shifting into second gear. But i guess it wouldn't hurt to try it.
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Old 12-23-2009, 10:38 AM   #4
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Would it be recommended to put stock tune back on car prior to doing the fuse pull?
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Old 12-23-2009, 10:44 AM   #5
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I think the majority of us who did the fuse pull on our L99's had stock cars, but I could be wrong. Try the fuse pull with the current tune and see if there is any change. Good luck buddy!
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Old 12-23-2009, 10:45 AM   #6
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Re-read the fuse pull thread and found my answer........

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However it is important to note that you shouldn't need to try the fuse pull if you've only used high octane gas since getting a custom tune, because burning the tune to the ECU resets all volatile memory.
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Old 12-23-2009, 11:16 AM   #7
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Dang...have you considered another option? Perhaps refund
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Old 12-23-2009, 11:24 AM   #8
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Will be looking into it. Already fired off an e-mail to Superchips.
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Old 12-23-2009, 11:31 AM   #9
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You truely can't complain if you don't know your before power.

You need to compaire a stock dyno vs. a modded dyno to see what the superchips power increase was.

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Old 12-23-2009, 11:32 AM   #10
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First off
Your car is running fine (bone stock). You don't need to do the fuse pull mod by looking at your dyno number. Your (bone stock) L99 is very capable of low 13s as it sits.

Now about the Superchips, thats a different issue. But I wouldn't expect much (but you should see some improvement) from a hand held pragrammer with a canned tune.
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Old 12-23-2009, 11:39 AM   #11
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Quote:
You truely can't complain if you don't know your before power.

You need to compaire a stock dyno vs. a modded dyno to see what the superchips power increase was.

Mav
True. Considering replacing stock tune and putting it back on the Dyno
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Old 12-23-2009, 11:48 AM   #12
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Also the tune should have set the correct Octane table for you. Fuse pull wouldn't help there...
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Old 12-23-2009, 11:56 AM   #13
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Quote:
Originally Posted by MadMav View Post
You truely can't complain if you don't know your before power.

You need to compaire a stock dyno vs. a modded dyno to see what the superchips power increase was.

Mav
Another Cali member dynoed his L99 car completely stock at 338 RWHP or so.
Another one did 328 RWHP completely stock as well.
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Old 12-23-2009, 12:09 PM   #14
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Quote:
Originally Posted by MadMav View Post
You truely can't complain if you don't know your before power.

You need to compaire a stock dyno vs. a modded dyno to see what the superchips power increase was.

Mav
I agree.HP varies from car to car.
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Old 12-23-2009, 12:32 PM   #15
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For reference I dyno'd 335hp. I'm not a tune expert bu your AF Ratio is at 15:1! I've never seen a dyno yet with an A/F ration at 15.
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Old 12-23-2009, 12:58 PM   #16
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I believe that's just off idle. It leans out to low 12's @ WOT
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Old 12-23-2009, 01:11 PM   #17
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Quote:
Originally Posted by firengnred View Post
I believe that's just off idle. It leans out to low 12's @ WOT
ditto
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Old 12-23-2009, 01:32 PM   #18
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Quote:
I believe that's just off idle. It leans out to low 12's @ WOT
My bad.......... had it backwards. it richens at WOT to low 12's.
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Old 12-23-2009, 01:39 PM   #19
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Did you ask how much rwhp stock L99's usually make on that particular dyno.

On the dynojet (SAE corrected numbers) in my area, stock L99's only make around 318 - 319 rwhp. They've dynoed several stock L99s and they were all in that range. Also, these were strong running L99s. One ran 13.3s in warm air.
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Old 12-23-2009, 01:53 PM   #20
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The only other Camaro they have run had already been supercharged.
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Old 12-23-2009, 06:20 PM   #21
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Quote:
Originally Posted by toehead93 View Post
For reference I dyno'd 335hp. I'm not a tune expert bu your AF Ratio is at 15:1! I've never seen a dyno yet with an A/F ration at 15.
At the beginning of any pull you are in closed loop (14.7:1) (under 25% throttle position on the 6 Speed 30% on the auto) Once your dyno operator floors it, you switch to Open Loop cycle which is the fuel enrichment mode. 14.7 parts air for every 1 part fuel.

Closed loop is stoichiometric, or theoretically the chemically correct burn for a specific fuel. In the case of E10 is is 14:1; E0 (pure gasoline no longer available anywhere) 14.7:1; E85 9.675:1.

Since the LS3 is not a Flex Fuel motor (it could be easily with the proper tuning) the closed loop tables are locked in. What is curious to me, is that since all states now pump E10 (except for CA which is E5.7) you would think that GM would lock in 14:1 instead of 14.7:1 to more accurately burn the fuel in closed loop. I set all of our vehicles up that way in WI. Makes a pretty big difference in performance.

Open loop cuts away from the loop feedback of the O2 sensors and goes by the factory presets in the PE/RPM code adding fuel to avoid knock. What really happens is horsepower is reduced with additional fuel, which in turn lower the heat of combustion. The 12:1 ratios are Open Loop.
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Old 12-24-2009, 07:39 AM   #22
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What is curious to me, is that since all states now pump E10 (except for CA which is E5.7) you would think that GM would lock in 14:1 instead of 14.7:1 to more accurately burn the fuel in closed loop.
Just for the record....Ca. is now E10 compliant also.
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Old 12-24-2009, 09:17 AM   #23
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Quote:
Originally Posted by Iwantone2 View Post
Another Cali member dynoed his L99 car completely stock at 338 RWHP or so.
Another one did 328 RWHP completely stock as well.
If your not talking same exact dyno, then numbers can be all over he place.
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Old 12-24-2009, 10:39 AM   #24
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Just for the record....Ca. is now E10 compliant also.
I figured they would eventually. Lived there for almost 30 years, left it for dead in 2004.
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Old 12-24-2009, 02:57 PM   #25
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I figured they would eventually. Lived there for almost 30 years, left it for dead in 2004.
Wish I could. There's so much to love about Cali. except the damn Govmnt. and there intrusive rules and regs.
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