Too Much Horsepower For What It Is? Stock L99 @ 499HP - Page 2 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

SlingShot · 05-09-2019, 11:03 AM

^^^
That could be, I have a bad case of chemo brain and can't remember things so good...

gtstorey · 05-09-2019, 11:04 AM

Quote:

Originally Posted by Moto-Mojo

Ok, so that’s still 488HP. (1.1) Seems I have new bragging rights.

My math says 439 hp at 1.1 lb-ft/cu in

1.1 x 376 = 413.6 ft-lbs
.9 x 413.6 = 372.24 ft-lbs
6200 x 372.24 = 2,307,888 ft-lbs x RPM
2,307,888/5252 = 439.4 hp

Moto-Mojo · 05-09-2019, 11:58 AM

Quote:

Originally Posted by gtstorey

My math says 439 hp at 1.1 lb-ft/cu in

1.1 x 376 = 413.6 ft-lbs
.9 x 413.6 = 372.24 ft-lbs
6200 x 372.24 = 2,307,888 ft-lbs x RPM
2,307,888/5252 = 439.4 hp

See, told ya math wasn’t my strong suit! I’m still braggin’!

Moto-Mojo · 05-09-2019, 12:21 PM

I wrote Jeff Smith an email. (author of the article) I asked if he could get us a better torque to CI factor on the two SS motors. Gave him what a Chevy brochure had for the two compression ratios. Sorry, Rockin, I didn't ask about your factory freak!

gtstorey · 05-09-2019, 12:41 PM

Quote:

Originally Posted by Moto-Mojo

I wrote Jeff Smith an email. (author of the article) I asked if he could get us a better torque to CI factor on the two SS motors. Gave him what a Chevy brochure had for the two compression ratios. Sorry, Rockin, I didn't ask about your factory freak!

I think you are reading to much into the formula. This is more along the lines of a "rule of thumb" than a 100% accurate formula. 1.085 gives 433 hp and 1.00 gives 400 hp. Of course that leaves out the gross vs net discussion.

gringo · 05-09-2019, 12:51 PM

Quote:

Originally Posted by Moto-Mojo

So is it really more than the claimed 400HP? Not completely understanding net v gross...

Unfortunately, no it isn't. It still is just 400 hp. However, the V6 actually cranked out more power than what GM originally estimated hence the 304 hp and then the updated 312 hp rating on the LLT.

Moto-Mojo · 05-09-2019, 12:57 PM

I get the it’s not gospel thing but fun anyway. From Jeff:

“Dave,
Those numbers will be very close. I would suspect the LS3/L99 engines would come in around 1.28 or so - but each engine is dfferent. That number should be close.

For example 376 x 1.28 = 481 for torque x 0.9 = 433 then you have to choose the peak hp rpm - this is the big variable. Higher rpm (bigger cam) will produce more hp. Likely the peak rpm for hp will be around 6,300 as an estimate - which puts it at 519 hp.

Hope this helps. Have fun!”

Jeff

519, Gringo. Truly too much for what it is!

InFiD3ViL · 05-09-2019, 01:28 PM

Thank you so much for this info man.

I can confirm my L99 is already faster after reading this!

Moto-Mojo · 05-09-2019, 01:43 PM

No sweat. I got you over 100 flywheel horsepower today and you didn’t have to lift a wrench or bust a knuckle!

redcoats1976 · 05-09-2019, 05:07 PM

Quote:

Originally Posted by qcman

I would say no in the sense the 400 HP includes the belts etc. (net) which is what they report but the HP on just the block (gross)would be higher than 400 though I don't know by how much.

I believe back in the 60's when they claimed HP on motors they were reporting gross which was a little misleading. I'm not sure thats what they did though.

yup.back in the day tests were run with no accessories hooked up.very misleading.

Vegas Bound · 05-09-2019, 05:34 PM

Does a high flow oil filter add hp?

InFiD3ViL · 05-09-2019, 05:58 PM

Quote:

Originally Posted by Vegas Bound

Does a high flow oil filter add hp?

Does it come with a sticker?

Moto-Mojo · 05-09-2019, 06:25 PM

Quote:

Originally Posted by Vegas Bound

Does a high flow oil filter add hp?

I’m sure it does...probably around the 5th decimal place.

JerTM · 05-09-2019, 06:31 PM

Quote:

Originally Posted by InFiD3ViL

Does it come with a sticker?

Only for the V6, it says "don't even try, packin heat!"

05-09-2019, 11:03 AM	#15
SlingShot Drives: 2012 ZL1 - #670 Join Date: Jun 2009 Location: Seminole, Fl. Posts: 8,009	^^^ That could be, I have a bad case of chemo brain and can't remember things so good... __________________

05-09-2019, 12:21 PM	#18
Moto-Mojo Fast Cars and Old Guitars Drives: 2015 2SS RS (L99, baby!) Join Date: Apr 2012 Location: N. CA Posts: 4,203	I wrote Jeff Smith an email. (author of the article) I asked if he could get us a better torque to CI factor on the two SS motors. Gave him what a Chevy brochure had for the two compression ratios. Sorry, Rockin, I didn't ask about your factory freak! __________________ “I don’t want to belong to any club that would have me as a member.” - Groucho Marx

05-09-2019, 12:57 PM	#21
Moto-Mojo Fast Cars and Old Guitars Drives: 2015 2SS RS (L99, baby!) Join Date: Apr 2012 Location: N. CA Posts: 4,203	I get the it’s not gospel thing but fun anyway. From Jeff: “Dave, Those numbers will be very close. I would suspect the LS3/L99 engines would come in around 1.28 or so - but each engine is dfferent. That number should be close. For example 376 x 1.28 = 481 for torque x 0.9 = 433 then you have to choose the peak hp rpm - this is the big variable. Higher rpm (bigger cam) will produce more hp. Likely the peak rpm for hp will be around 6,300 as an estimate - which puts it at 519 hp. Hope this helps. Have fun!” Jeff 519, Gringo. Truly too much for what it is! __________________ “I don’t want to belong to any club that would have me as a member.” - Groucho Marx

05-09-2019, 01:28 PM	#22
InFiD3ViL Drives: 2010 CGM 2SS/RS LS3 Swapped A6 Join Date: Sep 2016 Location: Spring Hill, FL Posts: 4,734	Thank you so much for this info man. I can confirm my L99 is already faster after reading this! __________________ 2010 CGM Camaro 2SS LS3 Swapped A6 - GPI LS3 SS1 .647/.638, (224/237, 112 +4, 7º overlap) on CamMotion 8620 core, BTR Platinum .660" Dual Spring kit w/titanium retainers, CHE bronze trunnion upgrade, stock heads milled @ .015, Melling HV 10296 oil pump, TSP 1-7/8" long tube headers (W/Catless Off-road Pipes), Corsa Xtreme 3" Catback, GPI Ported/Rod Mod Intake, Stage 2 Ported Throttle Body, Vararam OTR CAI, Mike Norris Gen 2 catch can + GM 1LE clean side separator, 160º thermostat - Megan Racing adjustable coilovers (lowered 1.75"), MRR M017 10/11" wheels-Tuned by Ryan @ GPI

05-09-2019, 01:43 PM	#23
Moto-Mojo Fast Cars and Old Guitars Drives: 2015 2SS RS (L99, baby!) Join Date: Apr 2012 Location: N. CA Posts: 4,203	No sweat. I got you over 100 flywheel horsepower today and you didn’t have to lift a wrench or bust a knuckle! __________________ “I don’t want to belong to any club that would have me as a member.” - Groucho Marx

05-09-2019, 05:34 PM	#25
Vegas Bound Account Suspended Drives: 2013 Sparkly Red One Join Date: Dec 2018 Location: Hospitality State Posts: 2,558	Does a high flow oil filter add hp?