L99 guys that switched from the 3.27 to 3.45 gear - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

94guy · 03-22-2011, 05:27 PM

anyone? if so did it help? did it hurt mpg?

ipimpthisc · 03-22-2011, 05:37 PM

it will hurt mpg if the gear is lower as in such...(higher numerical value) so yes... but that change will seem marginal..now if u go for like a 4.11 u will get lots of torque but lose gas mileage for sure..at least 2-3 mpg easy

Padre · 03-22-2011, 05:46 PM

I'm doing it within the next two weeks, if I ever get my torque converter from Jannetty.

I think it's a mod best suited with a torque converter. By itself on a stock L99, I expect it to just give you a nice "feel" but minimal measureable results. I expect it will enable me to be in the middle of my power band when I go through the traps, rather than at the bottom.

I'll post up install pics and results when I get it done. I have the pumpkin waiting, just waiting on my TC.

Padre

Padre · 03-22-2011, 05:52 PM

Would this be better in the

V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6)

forum?

Padre

94guy · 03-22-2011, 06:32 PM

well i was looking to see what the FI guys thought

hypurone · 03-22-2011, 07:23 PM

Not sure it will be "enough" of a change to write home about...
Now some 3.60's or 3.73 would be an eye opener!

Of course mileage would suffer a tad....

Supercharged SS · 03-22-2011, 07:33 PM

I've gone from the 3.27's to the 4.10's and now to the 3.45's. With enough power it should be enough. With only 550 rwhp the 4.10's should be good to go.

94guy · 03-22-2011, 07:51 PM

jamie have you driven your car with the 3.45's? does it shift right?

Supercharged SS · 03-22-2011, 08:09 PM

Quote:

Originally Posted by 94guy

jamie have you driven your car with the 3.45's? does it shift right?

Jas,
I drove it about 100 miles this weekend. First time with this enigine and rear. But yes, it shifted the same as stock. I would say the r's were about 2k for 75mph. I never was able to just mat it from a stop but as with all of Ted's stuff its shifted great. But so did the 4.10's

94guy · 03-22-2011, 08:24 PM

i bet it felt good riding in that beast

hot ss · 03-22-2011, 08:32 PM

in the pcm, you enter the new diff ratio, and you can have the trans tables auto multiply...so your shift points adjust, etc. kinda like a tire change.

Supercharged SS · 03-22-2011, 08:34 PM

Quote:

Originally Posted by hot ss

in the pcm, you enter the new diff ratio, and you can have the trans tables auto multiply...so your shift points adjust, etc. kinda like a tire change.

Ted was explaining to me that the tables didn't auto-multiply and that he had to change each value individually that he wanted to. I have no idea what needs to be done but thats what I got out of it. Nevertheless my car shifts good!

Supercharged SS · 03-22-2011, 08:36 PM

Quote:

Originally Posted by 94guy

i bet it felt good riding in that beast

It was nice. Still needs some tweaking. He sent me a new tune but for some reason its a cpe or cpf file that I can't open so I'll deal with it tomorrow and it still needs a tensioner. But it felt good!

hot ss · 03-22-2011, 08:44 PM

i saw the auto correct trans tabes switch, but have never used it, so i cant say with certainty. but if the man says it isnt so, then i guess it isn't so.

03-22-2011, 05:27 PM	#1
94guy Drives: 99 Camaro; 2010 Camaro 2SS/RS Join Date: Nov 2009 Location: louisiana Posts: 1,966	L99 guys that switched from the 3.27 to 3.45 gear anyone? if so did it help? did it hurt mpg?

03-22-2011, 05:46 PM	#3
Padre Only drives on Sundays Drives: '16 2SS A8 NPP MRC NGray Join Date: Feb 2011 Location: Dalton, GA Posts: 2,500 View My Garage	I'm doing it within the next two weeks, if I ever get my torque converter from Jannetty. I think it's a mod best suited with a torque converter. By itself on a stock L99, I expect it to just give you a nice "feel" but minimal measureable results. I expect it will enable me to be in the middle of my power band when I go through the traps, rather than at the bottom. I'll post up install pics and results when I get it done. I have the pumpkin waiting, just waiting on my TC. Padre __________________ OLD HOTNESS: The "Heretic": '11 2SS/RS L99 A6 Black/Inferno. Build Journal, Videos D1SC GT9 JBA-LT = 720/680 \| 10.330 @ 133.61, 1.546 sixty... Camaro King at ECS V, Darlington. NEW HOTNESS: '16 2SS A8 NPP MRC. Bone Stock, 1/8th: 8.051 @ 89.44, 1.919

03-22-2011, 05:52 PM	#4
Padre Only drives on Sundays Drives: '16 2SS A8 NPP MRC NGray Join Date: Feb 2011 Location: Dalton, GA Posts: 2,500 View My Garage	Would this be better in the V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) forum? Padre __________________ OLD HOTNESS: The "Heretic": '11 2SS/RS L99 A6 Black/Inferno. Build Journal, Videos D1SC GT9 JBA-LT = 720/680 \| 10.330 @ 133.61, 1.546 sixty... Camaro King at ECS V, Darlington. NEW HOTNESS: '16 2SS A8 NPP MRC. Bone Stock, 1/8th: 8.051 @ 89.44, 1.919

03-22-2011, 07:23 PM	#6
hypurone I'm not totally useless.. Drives: ... Join Date: Sep 2009 Location: ... Posts: 2,008 View My Garage	Not sure it will be "enough" of a change to write home about... Now some 3.60's or 3.73 would be an eye opener! Of course mileage would suffer a tad.... __________________ "You were really flyin' when I passed you back there!" - Born on 10/05/09 MyCamaroBuildInfo

03-22-2011, 08:32 PM	#11
hot ss Drives: aqua 2ss l99 Join Date: Jun 2009 Location: Edmonton Posts: 1,215	in the pcm, you enter the new diff ratio, and you can have the trans tables auto multiply...so your shift points adjust, etc. kinda like a tire change. __________________ May your exhaust note, sing in harmony with your blower.

03-22-2011, 05:37 PM	#2
ipimpthisc Banned Drives: @twinturbo, cammed, intrcooled@ Join Date: Apr 2009 Location: nyc, EAST COAST HEAVY HITTERS Posts: 739	it will hurt mpg if the gear is lower as in such...(higher numerical value) so yes... but that change will seem marginal..now if u go for like a 4.11 u will get lots of torque but lose gas mileage for sure..at least 2-3 mpg easy

03-22-2011, 06:32 PM	#5
94guy Drives: 99 Camaro; 2010 Camaro 2SS/RS Join Date: Nov 2009 Location: louisiana Posts: 1,966	well i was looking to see what the FI guys thought

03-22-2011, 07:33 PM	#7
Supercharged SS Account Suspended Drives: 2010 Camaro Join Date: Feb 2010 Location: Sandy Hook, CT Posts: 11,927	I've gone from the 3.27's to the 4.10's and now to the 3.45's. With enough power it should be enough. With only 550 rwhp the 4.10's should be good to go.

03-22-2011, 07:51 PM	#8
94guy Drives: 99 Camaro; 2010 Camaro 2SS/RS Join Date: Nov 2009 Location: louisiana Posts: 1,966	jamie have you driven your car with the 3.45's? does it shift right?

03-22-2011, 08:24 PM	#10
94guy Drives: 99 Camaro; 2010 Camaro 2SS/RS Join Date: Nov 2009 Location: louisiana Posts: 1,966	i bet it felt good riding in that beast

03-22-2011, 08:44 PM	#14
hot ss Drives: aqua 2ss l99 Join Date: Jun 2009 Location: Edmonton Posts: 1,215	i saw the auto correct trans tabes switch, but have never used it, so i cant say with certainty. but if the man says it isnt so, then i guess it isn't so. __________________ May your exhaust note, sing in harmony with your blower.

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