Stock L99 Dynograph w/ some interesting info - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

GMRULZ · 08-11-2009, 11:25 AM

I just dynoed mine to get a baseline (600 miles) and it put down 319rwhp twice then we pulled the pcm fuses for it to forget the LTFT (Long Term Fuel Trims), engine had more heatsoak than the first two pulls and it put down 327rwhp...Let me tell you picking up 8rwhp by doing that, this computer has a serious nanny program. The trans tune alone is going to be awesome. It really woke up my A6 Vette. I put ARH headers on it the day after and as soon as the Vararam is ready that will go on and I will get it tuned. So have faith o L99 bretheren...The curious thing I`ve noted is how there is a slight sip in the graph after 5250rpm`s then it picks back up, I`m assuming this may be when the VVT kicks out and is no longer making that extra midrange power. Any tuners can explain that? I`ve seen it on other L99 graphs, but not on the LS3 graphs...

Terrellford12 · 08-11-2009, 11:36 AM

What can i do to gain the extra 8 hp i have a l99 and what does this take from the car itself

GMRULZ · 08-11-2009, 11:42 AM

Quote:

Originally Posted by Terrellford12

What can i do to gain the extra 8 hp i have a l99 and what does this take from the car itself

Remove the ECM fuse to clear the LTFT memory, then reinstall after a couple of minutes, it will relearn it though after some time and will need to be done again to get the power back. It is some sort of GM nanny thing evidently. The car won`t run w/ out the fuse being reinstalled if that was your question regarding what would it take away from the car.

You could install a Dash Hawk to clear it at the touch of a button from inside the car, but I`m hoping this bad learning can be tuned out or made not so sensitive so it doeesn`t take away so much power. I`m going to post this in the tuning section as a question.

shroomjohn · 08-11-2009, 11:50 AM

Man just wish theyd let these cars run like theyre meant to and stop trying to take away the power in these badboys

PQ · 08-11-2009, 11:51 AM

I see your fuel/air mixturre stayed constant at a normal level during that pull. Was it the same on the other pulls?

GMRULZ · 08-11-2009, 11:53 AM

Quote:

Originally Posted by irpq11

I see your fuel/air mixturre stayed constant at a normal level during that pull. Was it the same on the other pulls?

I beleive it was the same, I`m trying to get the graph of all 3 overlayed, but the dynoguy gave me only the best one. If and when I can get it I will post it.

PQ · 08-11-2009, 12:03 PM

Quote:

Originally Posted by GMRULZ

I beleive it was the same, I`m trying to get the graph of all 3 overlayed, but the dynoguy gave me only the best one. If and when I can get it I will post it.

Mine took 'the plunge' and at one point dropped off of the cart.

SGOS252382 · 08-11-2009, 05:36 PM

The L99 isn't the first car to make more power (very short term) with an computer re-set.
But it doesn't take all that long for the computer to correct itself go back to stock HP levels.

GMRULZ · 08-11-2009, 08:17 PM

Quote:

Originally Posted by SGOS252382

The L99 isn't the first car to make more power (very short term) with an computer re-set.
But it doesn't take all that long for the computer to correct itself go back to stock HP levels.

You gotthat right. It needs to be tuned out as much as possible or a dash hawk to reset it from the cabin.

Tomato · 08-11-2009, 11:04 PM

Quote:

Originally Posted by GMRULZ

You gotthat right. It needs to be tuned out as much as possible or a dash hawk to reset it from the cabin.

Which fuse did you pull? I looked in my manual and found an "ECM" fuse as well as an "ECM Battery" fuse. I'm assuming the battery fuse keeps power and memory for the ECM...

Thanks!

live2well · 08-12-2009, 07:32 AM

Quote:

Originally Posted by Tomato

Which fuse did you pull? I looked in my manual and found an "ECM" fuse as well as an "ECM Battery" fuse. I'm assuming the battery fuse keeps power and memory for the ECM...

Thanks!

+1

Andro · 08-12-2009, 07:46 AM

GMRULZ · 08-12-2009, 07:49 AM

Quote:

Originally Posted by Tomato

Which fuse did you pull? I looked in my manual and found an "ECM" fuse as well as an "ECM Battery" fuse. I'm assuming the battery fuse keeps power and memory for the ECM...

Thanks!

I pulled both of those for good measure, wasn`t sure which one would rest the ECM. I would also assume ECM battery fuse to be correct, but just to be sure I pulled both.

Tomato · 08-13-2009, 09:01 PM

Quote:

Originally Posted by GMRULZ

I pulled both of those for good measure, wasn`t sure which one would rest the ECM. I would also assume ECM battery fuse to be correct, but just to be sure I pulled both.

Not to be a pain, but...You pulled your trunk apart to get to the ECM Battery fuse?

Thanks again.

08-11-2009, 11:25 AM	#1
GMRULZ Drives: 2010 SS & 2008 C6 Join Date: Mar 2008 Location: VA Posts: 1,819	Stock L99 Dynograph w/ some interesting info I just dynoed mine to get a baseline (600 miles) and it put down 319rwhp twice then we pulled the pcm fuses for it to forget the LTFT (Long Term Fuel Trims), engine had more heatsoak than the first two pulls and it put down 327rwhp...Let me tell you picking up 8rwhp by doing that, this computer has a serious nanny program. The trans tune alone is going to be awesome. It really woke up my A6 Vette. I put ARH headers on it the day after and as soon as the Vararam is ready that will go on and I will get it tuned. So have faith o L99 bretheren...The curious thing I`ve noted is how there is a slight sip in the graph after 5250rpm`s then it picks back up, I`m assuming this may be when the VVT kicks out and is no longer making that extra midrange power. Any tuners can explain that? I`ve seen it on other L99 graphs, but not on the LS3 graphs... __________________ 2010 SS L99, 536rwhp 10.843@126.72. Whipple Supercharger stock pulley, ARH 1 7/8 longtubes w/ catted xpipe, magnaflow 3" mufflers, ADM Race CAI, 3:70 gears, lightweight wheels and nitto drag radials. Stock internal L99, stock converter. Bolt on best before blower 12.22@113.29 w/ nothing but ARH headers, catted x-pipe, ADM CAI and a tune on stock Pzero`s! Other car 2008 C6 Ls3, z51, A6, Npp Exhaust, best bonestock pass 11.80@118.82, Number 2 on the Corvette Forums Bonestock fastest list.. Last edited by GMRULZ; 08-24-2009 at 07:05 AM.

08-11-2009, 11:50 AM	#4
shroomjohn Drives: Golden Eagle Join Date: Jun 2008 Location: No Posts: 1,134 View My Garage	Man just wish theyd let these cars run like theyre meant to and stop trying to take away the power in these badboys __________________ Loving this car!

08-11-2009, 11:51 AM	#5
PQ Booooosted. Drives: 2010 Supercharged SS Join Date: Apr 2008 Location: Mobile, AL Posts: 36,717 View My Garage	I see your fuel/air mixturre stayed constant at a normal level during that pull. Was it the same on the other pulls? __________________

08-12-2009, 07:46 AM	#12
Andro NOICE!!! ™ Drives: Force Fed 427 Join Date: Jan 2009 Location: GOT BOOST? Posts: 5,213 View My Garage	__________________

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08-11-2009, 11:36 AM	#2
Terrellford12 Drives: 2010 SS/RS & 2017 SS/RS Join Date: Jan 2009 Location: Bunkie La Posts: 341	What can i do to gain the extra 8 hp i have a l99 and what does this take from the car itself

08-11-2009, 05:36 PM	#8
SGOS252382 Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008 Location: S.W. Florida Posts: 6,294	The L99 isn't the first car to make more power (very short term) with an computer re-set. But it doesn't take all that long for the computer to correct itself go back to stock HP levels.