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View Full Version : 2.8 tranny guys



aaronamerica
02-22-2009, 08:08 AM
well you guys know my tranny went out while back so now I'm ready to go ahead and get the car running again but I'm kinda in a bind, I can get a 1.8 tranny at a pretty good price and I found a 2.8 tranny here local to me but its a lil more money, so I guess my question is, is it really that much of a difference in the power gain or is the 2.8 tranny much stronger...I mean whats really the main thing that guys go with this tranny for, I'm not trying to save gas at all


I do have the gt2871 kit with Tapp tune if that helps??

blmlozz
02-22-2009, 08:16 AM
if you get the 2.8, you'll need a V6 subframe as well.

People get the 2.8 01A because the taller gearing is better for Big turbo power bands.

I've never heard of gaining power with a 2.8 01a replacement.. all you're doing is changing the ratios. the transmission is the same so it's no more reliable than the 1.8 01a.

mike-2ptzero
02-22-2009, 09:34 AM
if you get the 2.8, you'll need a V6 subframe as well.

People get the 2.8 01A because the taller gearing is better for Big turbo power bands.

I've never heard of gaining power with a 2.8 01a replacement.. all you're doing is changing the ratios. the transmission is the same so it's no more reliable than the 1.8 01a.

He will not need a V6 subframe, all he has to do is swap out the driverside bracket/mount from his 1.8 transmission. Both use the same 01A transmission housing so they have the mounting location in the same spot.

People get the 2.8 01A transmission just for the taller gearing so that they have a slightly lower rpm while driving at fwy speeds which will give them a slightly better gas mileage. It is not actually better for a big turbo power band because taller gears means it takes longer to get thru each gear and spending more time in the power band where you make less power.


So if the car is used as a daily driver and mainly on the fwy the 2.8 is a nice improvement. But just expect the car to feel slightly slower when running it hard. I have used both 01A transmissions on my car. With the 2.8 transmission my car ran 11.3 at high 120 mph traps, when I switched back to the 1.8t trans my ET dropped to 10.7-10.8 and 135mph traps.

AudiA4_20T
02-22-2009, 10:01 AM
if you get the 2.8, you'll need a V6 subframe as well.

People get the 2.8 01A because the taller gearing is better for Big turbo power bands.

I've never heard of gaining power with a 2.8 01a replacement.. all you're doing is changing the ratios. the transmission is the same so it's no more reliable than the 1.8 01a.

WRONG... an 01A is an 01A, no subframe difference. You just use your mounts from the 1.8 tranny

Anyway, you dont gain power you just get more out of each gear and a higher top speed. I like it because I cruise on the highway a lot

aaronamerica
02-22-2009, 02:10 PM
So if the car is used as a daily driver and mainly on the fwy the 2.8 is a nice improvement. But just expect the car to feel slightly slower when running it hard. I have used both 01A transmissions on my car. With the 2.8 transmission my car ran 11.3 at high 120 mph traps, when I switched back to the 1.8t trans my ET dropped to 10.7-10.8 and 135mph traps.


wow thats a huge difference in timing at the track, so I guess the 1.8t tranny is the best way to go because I dont use my car for daily use at all, the only time I drive it is when I want to go out and play

mike-2ptzero
02-22-2009, 02:24 PM
Correct. here are links showing rpm/mph for both.

1.8 trans (http://www.car-videos.net/tools/speedrpm.asp?Car=Select&Num1=225&Num2=45&Num3=17&AxleRatio=3.889&Ratio1=3.778&Ratio2=2.176&Ratio3=1.429&Ratio4=1.029&Ratio5=.838&Ratio6=&Ratio7=&Redline=7200&Increment=500&B1=Recalculate)

2.8 trans (http://www.car-videos.net/tools/speedrpm.asp?Car=Select&Num1=225&Num2=45&Num3=17&AxleRatio=3.889&Ratio1=3.500&Ratio2=1.944&Ratio3=1.300&Ratio4=.943&Ratio5=.789&Ratio6=&Ratio7=&Redline=7200&Increment=500&B1=Recalculate)

Really isn't much difference between the 1st gears, a whole 2.8 mph at 7200 rpm.

aaronamerica
02-22-2009, 02:50 PM
nice info