Guess my horsepower - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Redbeard11 · 07-16-2018, 07:01 AM

So I recently did a tranny swap from a m6 to a 4l80e with a 3200 stall. At the same time I also did some prc cnc heads milled .20. Originally with the m6 the car made 725 rwhp. On the same dyno with the new setup it made 640. Does this sound right? Do u lose that much thru an auto? Any comments welcome! Thanks

hou30guy · 07-16-2018, 07:01 AM

Yup especially with that trans

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hou30guy · 07-16-2018, 07:02 AM

Surprised u didnt do a 6l80e

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UBB · 07-16-2018, 09:30 AM

you swapped from a M6 to an auto on purpose? Did you lose a foot in a freak accident (if so, my apologies) if not................ :/

JLSuperfly · 07-16-2018, 09:51 AM

Quote:

Originally Posted by UBB

you swapped from a M6 to an auto on purpose? Did you lose a foot in a freak accident (if so, my apologies) if not................ :/

Which is better, auto or manual?

mickss · 07-16-2018, 10:11 AM

Quote:

Originally Posted by JLSuperfly

Which is better, auto or manual?

It would depend on what a person intents to use the car for. If you`re a serious drag racer then you probably should be using an auto that`s set up and modified for the strip, if it`s a daily driver then it really doesn`t matter what your preference is.

hou30guy · 07-16-2018, 10:12 AM

I love my 850hp auto

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Moto-Mojo · 07-16-2018, 10:17 AM

And I love my 400HP auto. Beats the hell out of every factory auto I owned prior. Love is subjective.

Royal Tiger · 07-16-2018, 10:21 AM

6L80 loses about 22% from crank to rear wheel. Not sure on the accepted numbers on a TH400.

hou30guy · 07-16-2018, 10:29 AM

22% is inaccurate, more like 15 to 18

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hou30guy · 07-16-2018, 10:30 AM

A th400 is more than a 6l80 and heavier and on avg is 100hp less than a 6l80

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Royal Tiger · 07-16-2018, 11:05 AM

Quote:

Originally Posted by hou30guy

22% is inaccurate, more like 15 to 18

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The L99 was rated at 400 crank hp and most of baseline dyno pulls show 307-315rwhp. 22% loss would be 312rwhp. I’ve been told 20-22% by many on here with the 6L80. “Common knowledge” guesstimate used to be 15%, but that seems generous by the graphs I’ve seen.

Edit- I can’t find the post, but I believe Ted Janetty said he was getting 460-ish rwhp from a stock auto ZL-1. While not quite the same trans as the SS, it’s still in that 20-22% band. Using 15% would put my car at 455hp, which is extremely hard to believe based on mods and seeing other cars run on that same exact dyno.

hou30guy · 07-16-2018, 11:43 AM

Wow, cant argued there, i took my l99 out and went 408 stroker iron block with 10 rib maggie

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Royal Tiger · 07-16-2018, 11:48 AM

Quote:

Originally Posted by hou30guy

Wow, cant argued there, i took my l99 and went 408 stroker iron block with 10 rib maggie

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That’s a great place to go with a L99!!!

I hoping to do a cam next.

07-16-2018, 07:01 AM	#1
Redbeard11 Drives: 11 camaro Join Date: Mar 2017 Location: Canton ga Posts: 129	Guess my horsepower So I recently did a tranny swap from a m6 to a 4l80e with a 3200 stall. At the same time I also did some prc cnc heads milled .20. Originally with the m6 the car made 725 rwhp. On the same dyno with the new setup it made 640. Does this sound right? Do u lose that much thru an auto? Any comments welcome! Thanks __________________ 2011 1SS/ Thompson mtrsprts 416,Katech rotate assembly and cnc ls3 heads. Ferrera st. valves,BTR 685 Spr. F1A Procharger,3.70 pulley on 12 rib.Holley aux fuel pump,ZL1 fp and fpcm,dual alky control,Vmax TB,DSX E-85 sensor, fic1300 inj.Lsxperts custom cam,melling OP,mishimoto dual pass HX, ARH 2" headers, MD 4l80e, FTI 3200 stall,3:73 zl1 cradle, BC coil overs ,pfadt sway bars, EBC brakes and slotted rotors: 843rwhp tuned by LSXPERTS

07-16-2018, 10:17 AM	#8
Moto-Mojo Fast Cars and Old Guitars Drives: 2015 2SS RS (L99, baby!) Join Date: Apr 2012 Location: N. CA Posts: 3,966	And I love my 400HP auto. Beats the hell out of every factory auto I owned prior. Love is subjective. __________________ “I don’t want to belong to any club that would have me as a member.” - Groucho Marx

07-16-2018, 11:43 AM	#13
hou30guy Drives: 2011 convertible 2ss/rs Join Date: Sep 2015 Location: Houston Posts: 971	Wow, cant argued there, i took my l99 out and went 408 stroker iron block with 10 rib maggie Sent from my SM-N950U using Tapatalk Last edited by hou30guy; 07-16-2018 at 12:08 PM.

07-16-2018, 07:02 AM	#3
hou30guy Drives: 2011 convertible 2ss/rs Join Date: Sep 2015 Location: Houston Posts: 971	Surprised u didnt do a 6l80e Sent from my SM-N950U using Tapatalk

07-16-2018, 09:30 AM	#4
UBB Drives: 2018 ZL1 Join Date: Jun 2016 Location: Bismarck Posts: 572 View My Garage	you swapped from a M6 to an auto on purpose? Did you lose a foot in a freak accident (if so, my apologies) if not................ :/

07-16-2018, 10:12 AM	#7
hou30guy Drives: 2011 convertible 2ss/rs Join Date: Sep 2015 Location: Houston Posts: 971	I love my 850hp auto Sent from my SM-N950U using Tapatalk

07-16-2018, 10:21 AM	#9
Royal Tiger Account Suspended Drives: 2013 2SS/RS Convertible Join Date: Apr 2016 Location: Lehigh Valley, PA Posts: 3,873	6L80 loses about 22% from crank to rear wheel. Not sure on the accepted numbers on a TH400.

07-16-2018, 10:29 AM	#10
hou30guy Drives: 2011 convertible 2ss/rs Join Date: Sep 2015 Location: Houston Posts: 971	22% is inaccurate, more like 15 to 18 Sent from my SM-N950U using Tapatalk

07-16-2018, 10:30 AM	#11
hou30guy Drives: 2011 convertible 2ss/rs Join Date: Sep 2015 Location: Houston Posts: 971	A th400 is more than a 6l80 and heavier and on avg is 100hp less than a 6l80 Sent from my SM-N950U using Tapatalk