Swapping to 3.45 gears on supercharged L99 - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

HAMBO · 01-05-2016, 02:53 PM

I've got a 2013 SS with an SLP TVS2300, still using the pulley that came with it. It's a daily driver and occasionally gets to the track (1-2 times per year).

I'm very happy with the way it drives, but have appetite for a bit more kick right off the line. Was wondering whether switching to 3.45 gears would do the trick? Have read higher than that (was also looking at the GM 3.91s) on an FI L99 is too much gear.

Also open to any other suggestions of next mods to add instead. Not really looking to add much more rwhp at this point (can maybe push another ~40-50 without having to do many other modifications I think). Though trying to keep mods to those approved in California (so no cats, LTs, cams, etc)

Thanks for any suggestions!

Apex Motorsports · 01-05-2016, 03:25 PM

You are only looking at something like a 5% torque advantage going from 3.27s-3.45s. You will get a lot more out of a torque converter. Or better yet, do both!

hammdo · 01-05-2016, 04:08 PM

I had 3.91 and changed to 3.45 but if I had my original 3.27s, I would keep them.

With the 3.45s, 1st and 2nd spin city at my RWHP... What RWHP are you?

I agree, not a big enough change from 3.27 to warrant the cost.

Now a posi mod.... ;o)

-Don

Mr. Nasty · 01-05-2016, 04:13 PM

If you want the feel good go 3.91.

hammdo · 01-05-2016, 04:32 PM

Mr. Nasty, I'm assuming you're an M6?

That would makes sense on the manual using 3.91, autos are a different story, 3.91s are crazy in an auto ;o)...

-Don

Mr. Nasty · 01-05-2016, 05:02 PM

AUTO with the 4l80 been running the 3.91 For 3 years with it. If they made 4.11 that would not come apart I would run them.

I have friends in the 500rwhp with the 6l and running 3.91 rear gear

hammdo · 01-05-2016, 05:47 PM

4l80, that works!

-Don

HAMBO · 01-05-2016, 06:15 PM

Thanks for the tips everyone! Sounds like going to 3.45 isn't worth that much, but then again, wouldn't a 5% boost in torque be noticeable? With over 400 lb ft, that would be equivalent of adding +20 lb ft. Not a noticeable bump?

Also sounds like 3.91 on stock L99 transmission would be too much.

hammdo - would you mind elaborating on the posi mod? Sorry, still new to a lot of this.

Thanks!

Scuzz · 01-05-2016, 07:50 PM

I run 3:45 auto at 825 rwhp

JANNETTYRACING · 01-06-2016, 09:14 AM

Quote:

Originally Posted by HAMBO

I've got a 2013 SS with an SLP TVS2300, still using the pulley that came with it. It's a daily driver and occasionally gets to the track (1-2 times per year).

I'm very happy with the way it drives, but have appetite for a bit more kick right off the line. Was wondering whether switching to 3.45 gears would do the trick? Have read higher than that (was also looking at the GM 3.91s) on an FI L99 is too much gear.

Also open to any other suggestions of next mods to add instead. Not really looking to add much more rwhp at this point (can maybe push another ~40-50 without having to do many other modifications I think). Though trying to keep mods to those approved in California (so no cats, LTs, cams, etc)

Thanks for any suggestions!

3.45 is our go to gear for forced induction L99 cars.

We developed the posi mod back in 2010 when we went to the first Camaro 5 event and noticed many of the cars doing 1 tire burnouts.

Upon inspection we found that GM put together a wimpy posi clutch combo.

JRE posi mod comes with new clutches, preload spring and instructions to give you a tough posi that won't do 1 tire burnouts.

http://www.jreperformanceparts.com/2...-posi-mod.html

During this process we also developed our Billet cap kit because we found that the factory main caps stretch out and cause gear failure or noise.

http://www.jreperformanceparts.com/jre-billet-caps.html

We offer fully rebuilt and upgraded exchange Differentials built to your needs

http://www.jreperformanceparts.com/2...des-labor.html

Ted.

SRTKILLER · 01-06-2016, 09:54 AM

A converter will make a big difference out of the hole for you. That's what I would do over the gears or do both.

Moreair1 · 01-06-2016, 11:21 AM

Agree on the converter, but do your research on stall speed ect. On my 02 a4 z28 with a converter I dropped .5 seconds off my quarter mile time and it just made the car more fun

Rdunn · 01-06-2016, 12:36 PM

I'm still running my 3.27s

hammdo · 01-06-2016, 09:36 PM

Quote:

Originally Posted by JANNETTYRACING

3.45 is our go to gear for forced induction L99 cars.

We developed the posi mod back in 2010 when we went to the first Camaro 5 event and noticed many of the cars doing 1 tire burnouts.

Upon inspection we found that GM put together a wimpy posi clutch combo.

JRE posi mod comes with new clutches, preload spring and instructions to give you a tough posi that won't do 1 tire burnouts.

http://www.jreperformanceparts.com/2...-posi-mod.html

During this process we also developed our Billet cap kit because we found that the factory main caps stretch out and cause gear failure or noise.

http://www.jreperformanceparts.com/jre-billet-caps.html

We offer fully rebuilt and upgraded exchange Differentials built to your needs

http://www.jreperformanceparts.com/2...des-labor.html

Ted.

This is what I was referring to. GPI did mine. As I noted, first and second are a lot of spin at my RWHP level... Stock converter...

-Don

01-05-2016, 02:53 PM	#1
HAMBO Drives: Supercharged 2013 AGM 2SS/RS Join Date: Oct 2013 Location: Los Angeles, CA Posts: 786	Swapping to 3.45 gears on supercharged L99 I've got a 2013 SS with an SLP TVS2300, still using the pulley that came with it. It's a daily driver and occasionally gets to the track (1-2 times per year). I'm very happy with the way it drives, but have appetite for a bit more kick right off the line. Was wondering whether switching to 3.45 gears would do the trick? Have read higher than that (was also looking at the GM 3.91s) on an FI L99 is too much gear. Also open to any other suggestions of next mods to add instead. Not really looking to add much more rwhp at this point (can maybe push another ~40-50 without having to do many other modifications I think). Though trying to keep mods to those approved in California (so no cats, LTs, cams, etc) Thanks for any suggestions! __________________ 2013 AGM 2SS/RS SLP TVS2300, Edge CAI, 3" Magnaflow catback, BC Racing BR series coilovers, HRE FF15's (20x10 square) with Michelin Pilot Sport 4S's, GM STB, BMR front and rear sway bars and toe links, Prothane subframe bushings and front control arm inserts, JDP rear upper control arm bushings, Elite Engineering catch can. Tuned by Cunningham Motorsports. 1967 Bolero Red 396 SS/RS Convertible

01-05-2016, 04:08 PM	#3
hammdo 'It's an experiment' Drives: [COTW 2/09/15] '11 GPI LSA SC Z/LE Join Date: May 2014 Location: Dallas TX Posts: 8,694 View My Garage	I had 3.91 and changed to 3.45 but if I had my original 3.27s, I would keep them. With the 3.45s, 1st and 2nd spin city at my RWHP... What RWHP are you? I agree, not a big enough change from 3.27 to warrant the cost. Now a posi mod.... ;o) -Don __________________ 747 RWHP 794 RWTQ "Horsepower sells cars, torque wins races." - Enzo Ferrari See My Build: http://www.camaro5.com/forums/showthread.php?t=385577

01-05-2016, 04:13 PM	#4
Mr. Nasty Emerald Coast Camaros Drives: 2010 RS/SS Rally Yellow & 68 SS Join Date: Dec 2012 Location: Woodville,FL. Posts: 1,814	If you want the feel good go 3.91. __________________ Best @ 586/525 =10.41 @ 133 AS OF 12/13/14>633 RWHP =10.22@135 AS OF 1/31/15 @ 633 RWHP=10.16@135 AS OF 1/29/16 @ 633 RWHP=10.10@136 TOPED 700 PASSES AFTER F.I. AND STILL ON THE ORIGIANAL STOCK AXLE & DIFF

01-05-2016, 04:32 PM	#5
hammdo 'It's an experiment' Drives: [COTW 2/09/15] '11 GPI LSA SC Z/LE Join Date: May 2014 Location: Dallas TX Posts: 8,694 View My Garage	Mr. Nasty, I'm assuming you're an M6? That would makes sense on the manual using 3.91, autos are a different story, 3.91s are crazy in an auto ;o)... -Don __________________ 747 RWHP 794 RWTQ "Horsepower sells cars, torque wins races." - Enzo Ferrari See My Build: http://www.camaro5.com/forums/showthread.php?t=385577

01-05-2016, 05:02 PM	#6
Mr. Nasty Emerald Coast Camaros Drives: 2010 RS/SS Rally Yellow & 68 SS Join Date: Dec 2012 Location: Woodville,FL. Posts: 1,814	AUTO with the 4l80 been running the 3.91 For 3 years with it. If they made 4.11 that would not come apart I would run them. I have friends in the 500rwhp with the 6l and running 3.91 rear gear __________________ Best @ 586/525 =10.41 @ 133 AS OF 12/13/14>633 RWHP =10.22@135 AS OF 1/31/15 @ 633 RWHP=10.16@135 AS OF 1/29/16 @ 633 RWHP=10.10@136 TOPED 700 PASSES AFTER F.I. AND STILL ON THE ORIGIANAL STOCK AXLE & DIFF

01-05-2016, 03:25 PM	#2
Apex Motorsports Drives: 2000 Camaro SS Join Date: Feb 2010 Location: Louisville, Ky. Posts: 25,179	You are only looking at something like a 5% torque advantage going from 3.27s-3.45s. You will get a lot more out of a torque converter. Or better yet, do both!

01-05-2016, 05:47 PM	#7
hammdo 'It's an experiment' Drives: [COTW 2/09/15] '11 GPI LSA SC Z/LE Join Date: May 2014 Location: Dallas TX Posts: 8,694 View My Garage	4l80, that works! -Don __________________ 747 RWHP 794 RWTQ "Horsepower sells cars, torque wins races." - Enzo Ferrari See My Build: http://www.camaro5.com/forums/showthread.php?t=385577

01-05-2016, 06:15 PM	#8
HAMBO Drives: Supercharged 2013 AGM 2SS/RS Join Date: Oct 2013 Location: Los Angeles, CA Posts: 786	Thanks for the tips everyone! Sounds like going to 3.45 isn't worth that much, but then again, wouldn't a 5% boost in torque be noticeable? With over 400 lb ft, that would be equivalent of adding +20 lb ft. Not a noticeable bump? Also sounds like 3.91 on stock L99 transmission would be too much. hammdo - would you mind elaborating on the posi mod? Sorry, still new to a lot of this. Thanks! __________________ 2013 AGM 2SS/RS SLP TVS2300, Edge CAI, 3" Magnaflow catback, BC Racing BR series coilovers, HRE FF15's (20x10 square) with Michelin Pilot Sport 4S's, GM STB, BMR front and rear sway bars and toe links, Prothane subframe bushings and front control arm inserts, JDP rear upper control arm bushings, Elite Engineering catch can. Tuned by Cunningham Motorsports. 1967 Bolero Red 396 SS/RS Convertible

01-05-2016, 07:50 PM	#9
Scuzz Drives: 2012 Camaro SS Join Date: Aug 2013 Location: Mckinney, TX Posts: 347 View My Garage	I run 3:45 auto at 825 rwhp __________________ 2012 Camaro SS Automatic AGP Twin Turbo LSX427 / ADM Magic / 4L80 “1360 Rwhp 1225 Rwtq 25 lbs of boost”

01-06-2016, 09:54 AM	#11
SRTKILLER Drives: 2009 Cadillac CTS-V Join Date: Oct 2015 Location: Newcastle Posts: 79	A converter will make a big difference out of the hole for you. That's what I would do over the gears or do both.

01-06-2016, 11:21 AM	#12
Moreair1 Drives: 2011 ss convertible Join Date: Jul 2015 Location: Colorado Posts: 1,329 View My Garage	Agree on the converter, but do your research on stall speed ect. On my 02 a4 z28 with a converter I dropped .5 seconds off my quarter mile time and it just made the car more fun

01-06-2016, 12:36 PM	#13
Rdunn Really, Really Fast Drives: 2010 Camaro SS Join Date: Feb 2013 Location: St.Louis,Mo Posts: 686	I'm still running my 3.27s __________________ Procharger F1X, TH400, E85, CBI Street Cars, DSX Tuning, 1300whp