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View Poll Results: Estimate WHP after GPI mods/tune. Sitting at 390 w/ LTH, HiFlo cats, vararam cai.
<450 0 0%
450-475 11 57.89%
475-500 6 31.58%
500+ 2 10.53%
Voters: 19. You may not vote on this poll

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Old 07-29-2021, 08:12 PM   #29
Armyavi8r
 
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Quote:
Originally Posted by General Tsouís Chicken View Post
Why did you pick 3.91 gears for the L99?
Most people I conferred with recommended it. Your thoughts?
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2010 2SS/RS A6. "SINISTER"
GPI SS3 VVT Cam, 228/246 / Circle D 4C 36-3800 Stall / Stainless Works LTs / High Flow Cats / X-pipe / Vararam CAI with Power Wedge / Soler 95mm PTB / AAM 3.91 gear / GPI Ported Heads / GPI Ported Rod Mod / CHE Trunnions / GPI 5/16" hardened push rods, 7.425"/ Chevrolet Racing Lifters / Derale Xmsn cooler / Powerbond 25% UDP / Mishimoto catch can. GPI HP Performance Tune.

2011 2LT RS A6 "PARA BELLUM" Totalled- hit by red-light runner. RIP.
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Old 07-29-2021, 08:42 PM   #30
LCPLPunk
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Because you are smart... 3.91s kick ass with an L99...but with those, a converter, and cam, traction will be in short supply.
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R2C CAI / Apex Scoop / VMAX Ported TB / Speed Engineering LTHs / X-pipe / GPI port/rod-mod intake manifold / Circle D 3200 278mm Converter / 3.91 gears / DynoSteve tuned / 1LE Shocks/Struts/Toe Links / ZL1 Rear Sway Bar / Z/28 Trailing arms / Prothane Radius Arm & Subframe Bushings / BMR UCA Bracket, Steering rack bushing / B&M Tranny Cooler / RX Catch Can / Jannetty Tranny Dipstick / 2012+ Heater Hose / 2013+ Rearview Mirror / Fuel rail flip / Drake shifter / Oil Cooler Delete
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Old 08-03-2021, 10:53 AM   #31
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Quote:
Originally Posted by Armyavi8r View Post
Most people I conferred with recommended it. Your thoughts?
Iíve heard that high of a gear makes it extremely difficult to hook with an automatic. Thatís all. Iím doing GPI stage 2 and decided to go with 3.45. My understanding is better hooking and less shifts in the quarter mile.
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Old 08-03-2021, 11:18 AM   #32
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Quote:
Originally Posted by General Tsouís Chicken View Post
Iíve heard that high of a gear makes it extremely difficult to hook with an automatic. Thatís all. Iím doing GPI stage 2 and decided to go with 3.45. My understanding is better hooking and less shifts in the quarter mile.
I have 3.91 gears. With drag radials I can dead hook at the track. At a certain point, driving skill determines wheel spin because power is so high they can break loose at any speed. I can be doing 60mph and nail it, giving me smoke city lol. I had 3.42 I think but there was no jump when I launched.
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GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.
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Old 08-03-2021, 02:25 PM   #33
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Who has thoughts on the daily drivability of this build? I know a lot of that will depend on the tune, but just curious about any issues you may see with the components. I appreciate the info on the 3.91 gear. Thanks all! It goes under the wrench in a week.
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2010 2SS/RS A6. "SINISTER"
GPI SS3 VVT Cam, 228/246 / Circle D 4C 36-3800 Stall / Stainless Works LTs / High Flow Cats / X-pipe / Vararam CAI with Power Wedge / Soler 95mm PTB / AAM 3.91 gear / GPI Ported Heads / GPI Ported Rod Mod / CHE Trunnions / GPI 5/16" hardened push rods, 7.425"/ Chevrolet Racing Lifters / Derale Xmsn cooler / Powerbond 25% UDP / Mishimoto catch can. GPI HP Performance Tune.

2011 2LT RS A6 "PARA BELLUM" Totalled- hit by red-light runner. RIP.
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Old 08-03-2021, 02:46 PM   #34
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You shouldn't have any trouble with drivability. GPI is rock solid. And that converter will help a lot. Mines as smooth as can be. It only bucks at red lights lol.
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GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.
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Old 08-03-2021, 02:49 PM   #35
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Also I wouldn't go anymore than 10% underdrive.
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GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.
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Old 08-03-2021, 03:33 PM   #36
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I have 3.91s on my M6 LS3 and I don’t even notice it during normal driving. There are no drivability issues. It’s just designed to pull you harder on acceleration if you so choose.

Don’t get the 3.45 get the 3.91
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Old 08-03-2021, 03:34 PM   #37
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Oh and I still get about 22-24 mpg on the interstate at 70 mph on cruise control.
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Old 08-03-2021, 06:14 PM   #38
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Quote:
Originally Posted by TheFlyingBananaSS View Post
Also I wouldn't go anymore than 10% underdrive.
I'm interested to learn why. Is it just too much to take away from the accessories? Batter charging issue?
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2010 2SS/RS A6. "SINISTER"
GPI SS3 VVT Cam, 228/246 / Circle D 4C 36-3800 Stall / Stainless Works LTs / High Flow Cats / X-pipe / Vararam CAI with Power Wedge / Soler 95mm PTB / AAM 3.91 gear / GPI Ported Heads / GPI Ported Rod Mod / CHE Trunnions / GPI 5/16" hardened push rods, 7.425"/ Chevrolet Racing Lifters / Derale Xmsn cooler / Powerbond 25% UDP / Mishimoto catch can. GPI HP Performance Tune.

2011 2LT RS A6 "PARA BELLUM" Totalled- hit by red-light runner. RIP.
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Old 08-03-2021, 06:18 PM   #39
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Quote:
Originally Posted by Car Nation Videos View Post
Oh and I still get about 22-24 mpg on the interstate at 70 mph on cruise control.
Are you running a bigger cam at all? That mpg is what I'm running now. CAI, LTH and tune actually increased it slightly. Wondering what the SS3 cam will do to it, LoL.
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2010 2SS/RS A6. "SINISTER"
GPI SS3 VVT Cam, 228/246 / Circle D 4C 36-3800 Stall / Stainless Works LTs / High Flow Cats / X-pipe / Vararam CAI with Power Wedge / Soler 95mm PTB / AAM 3.91 gear / GPI Ported Heads / GPI Ported Rod Mod / CHE Trunnions / GPI 5/16" hardened push rods, 7.425"/ Chevrolet Racing Lifters / Derale Xmsn cooler / Powerbond 25% UDP / Mishimoto catch can. GPI HP Performance Tune.

2011 2LT RS A6 "PARA BELLUM" Totalled- hit by red-light runner. RIP.
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Old 08-03-2021, 06:19 PM   #40
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Quote:
Originally Posted by Armyavi8r View Post
I'm interested to learn why. Is it just too much to take away from the accessories? Batter charging issue?
Bingo. The very small gain isn't worth the risks for a daily car. Cooling issues, charging issues, power steering issues for certain years, and other issues. I noticed a increase in temp with 10% but the 160 offsets it pretty good. I would only go more with a dedicated all out performance build. But that's just me. Other people just sent it lol.
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GPI SS2 VVT cam, ECS Novi 1500 supercharger, Corsa Extreme, Detroit Speed and BMR suspension, Circle D triple disc, Melling oil pump, LS2 chain tensioner, ATI 10% UD, DSX E85 kit, High Energy coils, BTR springs, LS2 Lifter trays, Titanium retainers, hardened push rods, FIC 1000 injectors, ZL1 pump, Mighty Mouse catch can, AEM gauges, Tial BOV, Richmond 3.91 gears, Custom gauge bezels, Speed Engineering headers, Stainless Works HF cats, DSX Aux pump, 710rwhp on E85.
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Old 08-03-2021, 06:31 PM   #41
Armyavi8r
 
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Quote:
Originally Posted by TheFlyingBananaSS View Post
Bingo. The very small gain isn't worth the risks for a daily car. Cooling issues, charging issues, power steering issues for certain years, and other issues. I noticed a increase in temp with 10% but the 160 offsets it pretty good. I would only go more with a dedicated all out performance build. But that's just me. Other people just sent it lol.
Makes a lot of sense. I'm going to swing by GPI tomorrow and will discuss. I appreciate the input. I like the idea of reducing the hp tax, but 10% might be better for a daily driver as you say. Thanks!
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2010 2SS/RS A6. "SINISTER"
GPI SS3 VVT Cam, 228/246 / Circle D 4C 36-3800 Stall / Stainless Works LTs / High Flow Cats / X-pipe / Vararam CAI with Power Wedge / Soler 95mm PTB / AAM 3.91 gear / GPI Ported Heads / GPI Ported Rod Mod / CHE Trunnions / GPI 5/16" hardened push rods, 7.425"/ Chevrolet Racing Lifters / Derale Xmsn cooler / Powerbond 25% UDP / Mishimoto catch can. GPI HP Performance Tune.

2011 2LT RS A6 "PARA BELLUM" Totalled- hit by red-light runner. RIP.
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Old 08-03-2021, 08:52 PM   #42
LCPLPunk
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2013s have hydraulic steering, 2010/11s don't. Please let us know what GPI thinks about them, I have one I'm waiting to install.


As far as gears...man, they just make the car want to pull on the highway. I just did a 5 hour drive today and wasn't even hitting it and the car just wanted to go, it was just smooth.
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"A Camaro in the garage is safe, but that's not what Camaros are built for..."

R2C CAI / Apex Scoop / VMAX Ported TB / Speed Engineering LTHs / X-pipe / GPI port/rod-mod intake manifold / Circle D 3200 278mm Converter / 3.91 gears / DynoSteve tuned / 1LE Shocks/Struts/Toe Links / ZL1 Rear Sway Bar / Z/28 Trailing arms / Prothane Radius Arm & Subframe Bushings / BMR UCA Bracket, Steering rack bushing / B&M Tranny Cooler / RX Catch Can / Jannetty Tranny Dipstick / 2012+ Heater Hose / 2013+ Rearview Mirror / Fuel rail flip / Drake shifter / Oil Cooler Delete
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