with 391 gears - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

2ss black · 08-03-2014, 08:31 AM

with 391 gears what gear are u bolt on guys going through the 1/4 mile in this means stock 20in tires and stock converter on a auto l99

954camaro · 08-03-2014, 10:16 AM

Man I wish I could answer this question. Even with all my mods I still haven't gone to the track yet

Pro Stock John · 08-03-2014, 06:49 PM

I also have a 3200 stall, I'm going thru in 4th gear.

mstanford.us · 08-04-2014, 06:08 AM

4th. M6 car with 3.91 and 27" diameter tires.

Pro Stock John · 08-04-2014, 08:20 AM

Though Mark's car has a cam I'd think he's shifting a lot higher than an A6 would with stock internals.

BFASTNOTLAST · 08-04-2014, 03:55 PM

M6 cammed 3.91's on stock 20's is 4th gear about 5700 crossing the line.

Camarojt · 08-04-2014, 09:14 PM

John what rpm are you shifting at and what rpm are you crossing at in 4th
To my knowledge ProStockJohn is the only L99 with a stock cam and 3.91's that has proven that this will work. Can anyone else with same mods confirm?

white ZL1 · 08-04-2014, 09:52 PM

Some bad math tells me that 6200rpm should be good to 114-115mph with a 3.91, 1.15, and 27.8 inch tire.
In an A6 that would have to happen with a locked converter. You can probably add another 300 unlocked.

Got a datalog of a pass from yesterday John?

Pro Stock John · 08-04-2014, 10:35 PM

I could send over a log tomorrow, but I was trying all sorts of shift points so some of them ended up being too high. But the time I went out before I had no problems.

Jeff_SS · 08-05-2014, 12:11 AM

If I have a 2013 LS3 SS,
and if I put in 3.91's in the rear,
and I have a decently sized cam,
and I shift at 7000-7100,
what will my RPM's be approximately when I cross in, I'm assuming, 4th..?

I'm looking to do 3.91's soon, will it be much of an advantage over the stock 3.45s for 1/4m?

NinoSS · 08-07-2014, 04:46 PM

Quote:

Originally Posted by Jeff_SS

If I have a 2013 LS3 SS,
and if I put in 3.91's in the rear,
and I have a decently sized cam,
and I shift at 7000-7100,
what will my RPM's be approximately when I cross in, I'm assuming, 4th..?

I'm looking to do 3.91's soon, will it be much of an advantage over the stock 3.45s for 1/4m?

LS3+cam+3.91's is a very nice set up. I think you will be about 5000-5500 in 4th crossing the line. If you want a 1/4 mile gear to cross the line near the top of 4th you will need a taller gear.

Pro Stock John · 08-07-2014, 04:47 PM

FWIW my shift points were all 6100 and over and I went thru the traps just fine in my car.

Jeff_SS · 08-08-2014, 01:08 AM

Quote:

Originally Posted by NinoSS

LS3+cam+3.91's is a very nice set up. I think you will be about 5000-5500 in 4th crossing the line. If you want a 1/4 mile gear to cross the line near the top of 4th you will need a taller gear.

Good info to know. Thank you!
Gonna do the 3.91's in the next month or two.

NinoSS · 08-09-2014, 07:24 PM

Quote:

Originally Posted by Jeff_SS

Good info to know. Thank you!
Gonna do the 3.91's in the next month or two.

You will love them!!! With a larger cam like you have your car will fly!

08-03-2014, 08:31 AM	#1
2ss black Drives: black2ss Join Date: Jul 2010 Location: pompano beach fl Posts: 253	with 391 gears with 391 gears what gear are u bolt on guys going through the 1/4 mile in this means stock 20in tires and stock converter on a auto l99

08-03-2014, 10:16 AM	#2
954camaro Drives: Camaro SS/RS inferno red interior Join Date: Mar 2012 Location: Pompano Beach FL Posts: 817 View My Garage	Man I wish I could answer this question. Even with all my mods I still haven't gone to the track yet __________________ SoFlo Muscle Car Group Miami/Broward

08-03-2014, 06:49 PM	#3
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	I also have a 3200 stall, I'm going thru in 4th gear. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

08-04-2014, 06:08 AM	#4
mstanford.us Mark Stanford Drives: Black 2010 SS LS3 Join Date: Aug 2010 Location: Wauconda, IL Posts: 78	4th. M6 car with 3.91 and 27" diameter tires. __________________ Mark Stanford 2010 M6 Midwestracing on FB CAI, Kooks 1 7/8" 3", LG G6X3, Remote tune by Ted Jannetty JRE God of Tuning, ID 8500 injectors, ZL1 Fuel system, BMR, Yellaterra, Lunati Valve train, Street Slayer Carbon Twin. Numbers pending Dyno test.

08-04-2014, 08:20 AM	#5
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	Though Mark's car has a cam I'd think he's shifting a lot higher than an A6 would with stock internals. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

08-04-2014, 03:55 PM	#6
BFASTNOTLAST Drives: 2012 SS LS3 Join Date: Mar 2012 Location: Denver NC Posts: 1,411 View My Garage	M6 cammed 3.91's on stock 20's is 4th gear about 5700 crossing the line. __________________

08-04-2014, 09:14 PM	#7
Camarojt Drives: 2011camaro SS Join Date: Nov 2012 Location: Allen, Tx Posts: 2,201	John what rpm are you shifting at and what rpm are you crossing at in 4th To my knowledge ProStockJohn is the only L99 with a stock cam and 3.91's that has proven that this will work. Can anyone else with same mods confirm?

08-04-2014, 09:52 PM	#8
white ZL1 Drives: none Join Date: Aug 2011 Location: DFW area Posts: 1,844	Some bad math tells me that 6200rpm should be good to 114-115mph with a 3.91, 1.15, and 27.8 inch tire. In an A6 that would have to happen with a locked converter. You can probably add another 300 unlocked. Got a datalog of a pass from yesterday John?

08-04-2014, 10:35 PM	#9
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	I could send over a log tomorrow, but I was trying all sorts of shift points so some of them ended up being too high. But the time I went out before I had no problems. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

08-05-2014, 12:11 AM	#10
Jeff_SS "Cam Only" Drives: 2013 Camaro SS Join Date: Nov 2011 Location: Scottsdale, AZ Posts: 1,708 View My Garage	If I have a 2013 LS3 SS, and if I put in 3.91's in the rear, and I have a decently sized cam, and I shift at 7000-7100, what will my RPM's be approximately when I cross in, I'm assuming, 4th..? I'm looking to do 3.91's soon, will it be much of an advantage over the stock 3.45s for 1/4m? __________________ 2013 AGM Camaro 2SS/RS M6 \| LSA Blower, 2.5" pulley, 10% lower, FIC1000's, Fore Innovations Twin Pump fuel system w/ Flex Fuel, CMS Custom Grind Cam, Kooks 1 7/8" headers w/ catless off-road pipes, NPP Exhaust, 3.91's, JLT ZL1 Intake, Prospeed Heat Exchanger \| Pfadt Suspension, 1LE Sway Bars \| DSS 1000hp axles \| Tuned by Ryne @ CMS E85: 734rwhp/636rwtq (mustang dyno) Last edited by Jeff_SS; 08-05-2014 at 12:26 AM.

08-07-2014, 04:47 PM	#12
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	FWIW my shift points were all 6100 and over and I went thru the traps just fine in my car. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800