2005 4 speed auto - gears ?
Thread Starter
Instructor
Joined: Feb 2009
Posts: 202
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From: Sofia
2005 4 speed auto - gears ?
What is the ratio on the standard auto 4 speed 2005 corvette gears ? Would it be a good idea to go for a higher ratio to get some decent power increase in a low budget ?
My early-year plan was to go Lingenfelter supercharger, but the economical situation affecting my business says differently, so I'm thinking of doing some cheaper mods instead.
So what do you think. A decent cold air induction and a higher gears ? What ratio for the 4 automatic ? Don't want to change the exhaust as a decent one would again settle at around 1.5k
Thanks for your advice
My early-year plan was to go Lingenfelter supercharger, but the economical situation affecting my business says differently, so I'm thinking of doing some cheaper mods instead.
So what do you think. A decent cold air induction and a higher gears ? What ratio for the 4 automatic ? Don't want to change the exhaust as a decent one would again settle at around 1.5k
Thanks for your advice
Last edited by tutin; Jul 14, 2009 at 05:15 PM.
Thread Starter
Instructor
Joined: Feb 2009
Posts: 202
Likes: 0
From: Sofia
No Z51 package.
2.73 ? Wow ! I didn't expect it to be THAT low tbh
Wouldn't a jump to 3.7 or 3.90 be too harsh ? How will it affect the top speed and what hp gain would you expect from such a change ?
The car is stock, except the previous owner removed the cats.
Could you have a look at this, do you think this is the right part, should I go for the 3.90 ?
http://www.summitracing.com/parts/RMG-4900311/
Thanks again
2.73 ? Wow ! I didn't expect it to be THAT low tbh
Wouldn't a jump to 3.7 or 3.90 be too harsh ? How will it affect the top speed and what hp gain would you expect from such a change ?The car is stock, except the previous owner removed the cats.
Could you have a look at this, do you think this is the right part, should I go for the 3.90 ?
http://www.summitracing.com/parts/RMG-4900311/
Thanks again
Racer
Joined: Jan 2009
Posts: 490
Likes: 0
From: West texas TX
I would go with 3.90. Your top speed would be effected very little if any. Gear changes wont add HP but it will make it seem like you gained a ton. It pretty much makes your RPM higher in all gears thus putting you in your powerband faster.
Burning Brakes
Joined: Aug 2005
Posts: 821
Likes: 0
From: Orlando FL.
Well, you said low budget...
See if you can find a used 3.42 from C5/C6 with factory stall
Thats what I have...no complains!
Plus...add a
Vararam Intake and Headers...or
Vararam with a Cat Back System to wake things up with the 3.42 on a budget.
Good Luck and trust me, it will never end.
See if you can find a used 3.42 from C5/C6 with factory stall
Thats what I have...no complains!
Plus...add a
Vararam Intake and Headers...or
Vararam with a Cat Back System to wake things up with the 3.42 on a budget.
Good Luck and trust me, it will never end.
Thread Starter
Instructor
Joined: Feb 2009
Posts: 202
Likes: 0
From: Sofia
Hmm, it's true I'm a blind folk when it comes to car mechanics, but please exaplain to me, may be I'm misunderstanding. Sure it wont change the HP on the engine, but since the transmission ratio is changed, the actual torque transferred to the wheels will be higher at the cost of top speed. Something like the low gears on the offroad vehicles - tons of power, but you can only go as fast as 20-30 mph.
Thread Starter
Instructor
Joined: Feb 2009
Posts: 202
Likes: 0
From: Sofia
Well, you said low budget...
See if you can find a used 3.42 from C5/C6 with factory stall
Thats what I have...no complains!
Plus...add a
Vararam Intake and Headers...or
Vararam with a Cat Back System to wake things up with the 3.42 on a budget.
Good Luck and trust me, it will never end.
See if you can find a used 3.42 from C5/C6 with factory stall
Thats what I have...no complains!
Plus...add a
Vararam Intake and Headers...or
Vararam with a Cat Back System to wake things up with the 3.42 on a budget.
Good Luck and trust me, it will never end.
Actually that's a good idea, I think I even saw someone selling a 3.43 off of a C6 here in one of the local subforums, it could be a good deal.
But please, tell me about the hp on the wheels and the topspeed effect
Not that I ever drive that fast, in fact I'm still to try and see what the top speed is, but yeah it'd suck just knowing that my car would only do let's say 250 km/h when it did 290-300 km/h before.
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Racer
Joined: Jan 2009
Posts: 490
Likes: 0
From: West texas TX
Well when I had a 06 mustang 5 speed auto I thought it would lower my top speed but when I went from 3.14 or somthing to 4.10 I acully didnt loose any top speed at all I wish some one elese could chime in on this. I also have the A4 and im going to go with 3.90 I mean how often do you top your car off anyways?
Last edited by Bkbulldog; Jul 15, 2009 at 01:04 AM.
Team Owner
Joined: Feb 2001
Posts: 27,254
Likes: 136
From: Short Hills, NJ
Check your build sheet (a white sticker with code numbers on it in the glove box or center box I believe?) and see if it says GU2 (2.73s) or G90 (3.15s).
Le Mans Master
Joined: Jun 2007
Posts: 7,610
Likes: 12
I had the 3.15 performance axle package on my base suspension '05 A4 vert. Wasn't enough. I went with 3.73 and a 3200 stall (flashes to 3600) and got what I wanted.
IMO 3.90 is too much for street driving. My buddy has an '05 w/ 3.90 and all I hear are those gears winding all the time.
BTW - I also swapped out the OEM A4 trany for a built A4.
IMO 3.90 is too much for street driving. My buddy has an '05 w/ 3.90 and all I hear are those gears winding all the time.
BTW - I also swapped out the OEM A4 trany for a built A4.
Advanced
Joined: Jul 2009
Posts: 63
Likes: 0
I would recommend the 3.42's also if you are on a budget. I went from 3.23's to 3.73's in my 97 Trans Am WS6 and the difference was amazing! Then you can send the computer off to like Speedinc or some other company to tune your computer for the gears, t-stat, stall or whatever and it would cost ~$125-$175. Not too bad
Team Owner
Joined: Dec 2002
Posts: 32,074
Likes: 296
From: San Francisco CA
Well, there is one other chance for someone with a non Z51 2005 C6 automatic to still have the 3.15 gears...it was also a freestanding option as well as part of that Z51 package.
Check your build sheet (a white sticker with code numbers on it in the glove box or center box I believe?) and see if it says GU2 (2.73s) or G90 (3.15s).
Check your build sheet (a white sticker with code numbers on it in the glove box or center box I believe?) and see if it says GU2 (2.73s) or G90 (3.15s).
Burning Brakes
Joined: Jan 2008
Posts: 1,021
Likes: 2
From: Lake Havasu City, AZ
St. Jude Donor '08-'09-'11-'12
Give Chuck CoW (vendor here) a call and ask him. He has two seperate gear packages and will likely talk you into a tune as well. For those who have done this, they speak highly of him, his abilities and the results....
That will be the next mod I do for the wife's 05 A4.....
That will be the next mod I do for the wife's 05 A4.....
Pro
Joined: Apr 2005
Posts: 702
Likes: 82
From: Ronkonkoma NY
St. Jude Donor '08-'09
I went from 3.15's to 3.42 in my a-4 and it's worked out very well.. A bit more low end pull and an insignificant milege drop, maybe 1mpg.. I also went for a ride in an a-4 with 3.90 gears and for me that was way over the top for sreet driving.. If you go from the stock 2.73 gear set to 3.42's I'm sure you'll be impressed, it will be a very noticable difference. good luck with your choice