How much rwhp and rwtq can a L99 engine handle? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Quicksilverman · 05-10-2017, 03:59 AM

After my warranty is over I am considering running a Procharger P1SC or D1SC and I wanted to know how much rwhp and rwtq can a stock L99 engine handle with a good tune before failures start to happen? What is the rwhp and rwtq limit to stay at with the stock L99 engine before you have upgrade to forged rods and pistons? What are the best engine upgrades to consider for forced induction to protect a stock L99 engine?

jc615 · 05-10-2017, 05:48 AM

If you are doing a p1sc or d1sc you will not need to worry about reliability

PostNup · 05-10-2017, 08:58 AM

650 is the limit of the trans. Some will say the AFM lifters, which require removal of the heads to change so, if you are going FI - you should pick up a set of LSA heads and only pay the labor once. These heads have a thicker deck and a better casting process that is better for FI. The crank should be happy till 800 or so. The rear end is tire choice dependant from everything I read... Some guys are fine with 650, others broke the spider gears at 380-400 with slicks.

Hth

CGbambam · 05-10-2017, 09:26 AM

If anything will give out is the trans first. Not sure how the l99 lifters hold up but you could always just do the DOD kit and swap in ls7 lifters. rest should be fine. rear end will be good unless you wheel hop

rrrocketman · 05-10-2017, 09:52 AM

Quote:

Originally Posted by CGbambam

If anything will give out is the trans first. Not sure how the l99 lifters hold up but you could always just do the DOD kit and swap in ls7 lifters. rest should be fine. rear end will be good unless you wheel hop

Does the same logic apply to the LS3/6060 combo? I'm getting 315 NT05s in the back and shooting for 600-650 HP but will have trailing arms, cradle bushings and toe rods. Therefore I don't expect wheel hop but that doesn't solve the torque problem.

CGbambam · 05-10-2017, 11:41 AM

My guess would be if you don't wheel hop it will be the pinion gear giving out. Just speculating. I've done rolls for the most part in my car so it hasn't seen much 1st gear WOT hits. Standard cars are a lot harder on rear ends then autos for sure.

Dega Man · 05-10-2017, 06:51 PM

Quote:

Originally Posted by CGbambam

If anything will give out is the trans first. Not sure how the l99 lifters hold up but you could always just do the DOD kit and swap in ls7 lifters. rest should be fine. rear end will be good unless you wheel hop

The Tranny is much more of a concern than the engine especially if you do the DOD the engine can handle it as CGbambam mentioned.

Kopterman · 05-10-2017, 08:40 PM

Quote:

Originally Posted by rrrocketman

Does the same logic apply to the LS3/6060 combo? I'm getting 315 NT05s in the back and shooting for 600-650 HP but will have trailing arms, cradle bushings and toe rods. Therefore I don't expect wheel hop but that doesn't solve the torque problem.

The TR6060 can handle more hp (I've read ~750-800) then the stock auto. The wheel hop will tend to take out axles though.

CGbambam · 05-11-2017, 04:14 PM

Yeah i wouldn't worry about the transmission itself if its a tr6060, I been beating mine on the highway at about 1100hp already for about 6 months already. But I also never punch it in 1st gear or from a dig

AGP Turbo · 05-11-2017, 06:11 PM

I've did 730whp daily for a long time on 100% stock L99, stock cam and everything. Trans died and I swapped in a ZL1 6L90. Run's 10.6's in total shit track prep 4000DA. I'm sure I could make it run 9's if I wanted to drag car it up.

If you are going to do the DOD delete you may as well put a real cam in too.

Blackss62 · 05-12-2017, 02:04 PM

Quote:

Originally Posted by AGP Turbo

I've did 730whp daily for a long time on 100% stock L99, stock cam and everything. Trans died and I swapped in a ZL1 6L90. Run's 10.6's in total shit track prep 4000DA. I'm sure I could make it run 9's if I wanted to drag car it up.

If you are going to do the DOD delete you may as well put a real cam in too.

Not to hijack but how long did the 6l80 last for you at that power? And if you did it again would you still go with the 6L90 or go for the 4l80? I have been running your kit for 2yrs now and we are looking to turn it up this year (running 7ish lbs.) and have a motor built at the end of the year and hoping to make 800-900whp.

AGP Turbo · 05-12-2017, 02:56 PM

6L80 lasted a few thousand miles at that power level.
I would for sure, 100% no question go 6L90 at that power level. We've done lots of 4L80 cars here and that is not for me.
Only thing I like the 4L80 for is a drag race car, well over 1000+whp.

Unavowed · 05-14-2017, 09:52 PM

Where did you source the 6L90 from?

bayarea408 · 05-15-2017, 12:03 AM

Quote:

Originally Posted by Unavowed

Where did you source the 6L90 from?

seriously every time i try to research it i end up with truck cores with rebuilds. Thats not exactly zl1 quality.

05-10-2017, 03:59 AM	#1
Quicksilverman Drives: 2012 Chevrolet Camaro Join Date: May 2017 Location: Atlanta,Georgia Posts: 16	How much rwhp and rwtq can a L99 engine handle? After my warranty is over I am considering running a Procharger P1SC or D1SC and I wanted to know how much rwhp and rwtq can a stock L99 engine handle with a good tune before failures start to happen? What is the rwhp and rwtq limit to stay at with the stock L99 engine before you have upgrade to forged rods and pistons? What are the best engine upgrades to consider for forced induction to protect a stock L99 engine?

05-10-2017, 08:58 AM	#3
PostNup CAR-DASHIAN Drives: 2015 Ashen Gray Metallic 2SS/RS L99 Join Date: Nov 2015 Location: Gilbert, AZ Posts: 541	650 is the limit of the trans. Some will say the AFM lifters, which require removal of the heads to change so, if you are going FI - you should pick up a set of LSA heads and only pay the labor once. These heads have a thicker deck and a better casting process that is better for FI. The crank should be happy till 800 or so. The rear end is tire choice dependant from everything I read... Some guys are fine with 650, others broke the spider gears at 380-400 with slicks. Hth __________________ PERFORMANCE: ColdAirInductions CAI, ADM Race Scoop, Cordes Performance Racing Ported TB/IM/Custom VVT Cam, WFO Milled Heads, Stainless Power 1 7/8" LT/3" HFCs, JBA 3" Comp. Cat-Back, Taylor 10.4mm Plug Wires, Tim King Performance Stage 3 6L80, Circle D Billet 3600 Stall, Nic D ECM/TCM Tune, - 458rwhp/413rwtq (prior to PIM), Forgestar F14 (F)18" / (R)17" Rims. SUSPENSION: Z/28 Rear UCA Bushings, Carlyle Racing LCA/TA, BMR Adj. Toe Rods/Xtreme Anti-Roll Bar, Justice Pete Castor Locks/Radius Rod Inserts, Pegasus Billet Rear Cradle Bushings, Mickey Thompson Street SS II 305/45/17 tires.

05-14-2017, 09:52 PM	#13
Unavowed Drives: Twin turbo G8 GXP Join Date: Dec 2012 Location: MD Posts: 454	Where did you source the 6L90 from? __________________ 9.88 @ 144 https://youtu.be/nN0rz1RAcJw

05-10-2017, 05:48 AM	#2
jc615 Account Suspended Drives: Camaro and Sierra Join Date: Jul 2012 Location: Virginia Posts: 794	If you are doing a p1sc or d1sc you will not need to worry about reliability

05-10-2017, 09:26 AM	#4
CGbambam Drives: 2011 Camaro 2SS Join Date: Sep 2015 Location: Houston Posts: 410	If anything will give out is the trans first. Not sure how the l99 lifters hold up but you could always just do the DOD kit and swap in ls7 lifters. rest should be fine. rear end will be good unless you wheel hop

05-10-2017, 11:41 AM	#6
CGbambam Drives: 2011 Camaro 2SS Join Date: Sep 2015 Location: Houston Posts: 410	My guess would be if you don't wheel hop it will be the pinion gear giving out. Just speculating. I've done rolls for the most part in my car so it hasn't seen much 1st gear WOT hits. Standard cars are a lot harder on rear ends then autos for sure.

05-11-2017, 04:14 PM	#9
CGbambam Drives: 2011 Camaro 2SS Join Date: Sep 2015 Location: Houston Posts: 410	Yeah i wouldn't worry about the transmission itself if its a tr6060, I been beating mine on the highway at about 1100hp already for about 6 months already. But I also never punch it in 1st gear or from a dig

05-11-2017, 06:11 PM	#10
AGP Turbo Drives: All things Turbocharged Join Date: Dec 2010 Location: AZ Posts: 1,199	I've did 730whp daily for a long time on 100% stock L99, stock cam and everything. Trans died and I swapped in a ZL1 6L90. Run's 10.6's in total shit track prep 4000DA. I'm sure I could make it run 9's if I wanted to drag car it up. If you are going to do the DOD delete you may as well put a real cam in too.

05-12-2017, 02:56 PM	#12
AGP Turbo Drives: All things Turbocharged Join Date: Dec 2010 Location: AZ Posts: 1,199	6L80 lasted a few thousand miles at that power level. I would for sure, 100% no question go 6L90 at that power level. We've done lots of 4L80 cars here and that is not for me. Only thing I like the 4L80 for is a drag race car, well over 1000+whp.