If you add a tork converter to the stock 273 will that bring it up to about what a 315 would do. I'm trying to get around spending 2000 dollars changing the gears in the rear end. Any one help?

 

I think it will outperform the 3:15. But, I would go to at least a 3:42 and it wouldn't cost you $2000. Maybe $1000 and if you have an A4 you need to have the PCM recalibrated. You should consider changing your profile so we can see what you have. You must have an A4 to have the 2:73 but more info would be nice.

Bob

 

A converter will CRUSH 3.15s and even 3.73's.

I went 12.72 at a best mph of 111.03mph on runflats. (2.0 sixty!!) I had to give it half throttle in first gear.

good converter will drop .6 tenths and pickup 2mph. Gears wont do that for you.

I am looking for low 12's with a drag radial on a glued track.



ps- My converter is a TCI 3000 (245 mm converter with 298mm lockup clutch)

 

you seem to hint that gears won't do anything for a car

glind46677; how often do you visit the 1/4 track per month ?

would you list all the mods on this car during that great 1/4 time ?

 

I went 12.76 last night with my 3:42 and stock TC. So there!

Bob

 

you're one fast ****...

 

If you want to go fast its going to cost you money. There is no cheap way to do it.

That said, I wouldn't even consider putting a high stall converter into a 2.73 geared car. The resultant looseness would make it a PITA to drive in stop and go traffic.

If I couldn't afford to dump my 2.73 gears and were "stuck" with them. And I were looking to get a real performance boost with a car cursed with 2.73s, I'd go with nitrous before I would go with a torque converter.

The nitrous would be a non factor during everyday driving, no looseness, and would not effect gas mileage or drivability .

At the track though, with say, a 100 shot, a 2.73 geared Vette on nitrous would give you better than 12.72.

 

I agree but I have not used a high stall tc as yet. I have read posts from other guys that have run a high stall with 2:73's. Suggest you use the search function. If I remember correctly they were happy with their results. You really need to talk to guys that have done this. I wouldn't!

Like EB20003 said, it cost money to go fast. Either go first class, or don't go.

Bob

 

When I originally replied to the first post, I had Sprayed C5s car in mind. He actually runs a 150 wet shot:

http://forums.corvetteforum.com/member.php?u=41964

2.73 gears and he runs 11.51@119MPH.

I recall him making a tongue in cheek post, a while back, stating that his "stock" C5 had run 11.51. When you went to look he pointed out "stock" except for 150 wet shot of nitrous.

He can still get 28 or so MPG on the highway with the 2.73s, and does not have to give the car half throttle, in city driving, just to get it moving like he would if he had a high stall coupled with those 2.73s.

My point however was that were it me, and I had to keep my 2.73s and could choose between the two performance upgrades, I would combine nitrous with 2.73s before I would combine a high stall torque converter with 2.73s. If I were going to keep my 2.73s this is the route I would go. However, perhaps not as big a shot as 150 . But thats just my opinion.

 

Other than the better launch, what are the advantages of an aftermarket TC in a street car? I'm more into road racing than drag racing.

 

Keeps your RPM's up so you're in the power band. It eliminates the 'dead spots'. I wouldn't do it if I didn't drag race.

Bob

 

A good converter will make a huge difference in performance on even a car with 2.73 gears. The down side is the looseness you will get with the 2.73 gears & a decent stall. However if you can still get the Yank TT2800 with 3.0 STR. You will get a very nice increase in performance and good driveability with 2.73 gears.

 

Half throttle? Have you ever driven a car with a high stall? The loosest combo I've ever driven was a Yank SY3500 with a 3.15 rear. With the stock idle rpm, the car would barely creep at all. But to get moving, it wouldn't even need a 1/4 throttle. Half throttle would get the car really moving! When I changed to a 3.73 rear, it felt almost as tight as stock again. Now with a Yank PT4400 and 4.10 rear, the car creeps fine in D with a raised idle rpm, and doesn't need NEARLY half throttle to get it moving.

 

My gosh.

Uh, with the term "half throttle" I was exaggerating, being faceatous, wry

I guess you didn't pick it up. Had I thought anyone would take the term "half throttle" literally, in the context I used it, I would have used an emoticon. I quess I should have.

I remember when I hand hand painted my hood liner. That thing soaked up a ton of paint.

Of course he wouldn't "literally" have to give the car half throttle to get it moving. And yes I have driven a friend's car with a 3600 stall converter. My point was that it would take more throttle to get the car moving from a standstill.

I wonder how much throttle it would have needed to get moving if it had that converter and 2.73s in it. Barely crept at stock idle with the 3.15s? I wonder how much it would have crept with 2.73s in it. On flat land and then on an incline.

"Wouldn't even need a 1/4 throttle", does not sound too bad. But how much throttle does he need to get his stock 2.73 geared car moving now? Much, much less than 1/4 throttle. It will creep and he barely needs to touch the accelerator to get it moving in traffic. That will change, perhaps significantly, if he changes to a high stall converter and that was my point



So you had the idle raised and now it creeps just fine?

Once again, I was speaking figuratively when I used the term "half throttle".

Oh well, looks like I won't be going to the track today......its raining cats and dogs

BTW Face, I'm looking at your signature and your car runs like a raped ape.

..

 

I've been there and done that my friend.There is just no shortcuts for what you ant to achieve.The 2.73's are no more than a paperweight! You can find a good used set of 3.42's for $500-$600 and a YANK SS3600 or a PT2800 is about $695 ...install maybe $350 and your on the way to better E.T's and a much more responsive driveline!!

P.S. Don't forget the Transgo shift kit
More info here www.transgoperformance.com It's the best bang for the buck out there for a C5 A4...PERIOD!!

 

on the costs. That will run him about $1295.00 for the parts and $350 for the labor. Then there is the programming for the gear change.

 

That's True.. You can invest in a Diablo Predator or then again get a experienced tuner to program with a LS1 Edit..

 

Yes, it was raised only because of the cam I had installed. Otherwise I'd stall at every light.

Thanks!

 

And I also wonder why people still try to convionce people they aren't

That ratio (2.73) is there to appease AlGore... period. And it's a waste of time & money IMO to try and get anything good out of it.

 

Went 12.52 with 2.73 and TCI 3000 stall So There!