2000^C5

There seems to be some confusion from past posts.

A 2.73 car with a nice converter (3000 stall or so) will be faster than a 3.42 A4 with the stock converter.

Just something to think about if you have the 2.73s and you are only planning one mod, make it the converter and not the gears. I have both but if I had to choose one, it would be the converter. And the converter does help from rolls as well. :smash:

Special K

What kind of et times do you have to back up that statement?

Bob
:flag

2000^C5

A good converter can knock off .5 seconds or more from a 1/4 mile time. The gear switch won't be doing that.

TLewis4095

He is correct...the gears will give you maybe 5-7 100ths (not quite a 10th)improvment depending on the ratio, where a 3500 stall convertor and nothing else will give you 4-5 10ths! Just my observations running a race team & the Ecklers Florida Corvette Challenge Series. :cheers:

Special K

So you are just going by 'seat of the pants' feel? I always felt like a clean car ran better! I'm not saying your wrong, but without testing before and after, I think it would be considered a guess.

Bob
:flag

2000^C5

No, it is a fact based on years of watching times and talking to people with both mods.

gmf

Interesting statement. I went with PT2800 and left my 3.15 gears
in as a compromise since I do quite a bit of highway driving.

I hope your statement is right, but I'd love to hear other guru's agree with ya.

Face

:iagree:
My SY3500 knocked .5 off my timeslips. Then I went from 3.15's to 3.73's, and knocked maybe another .1 off.

Mike Mercury

the confusion may be because of claims made without track slips posted.

here is mine:



this is a 2002 A4 with 3.42, stock TC, and no pcm reprog... and the only other mod is the '02 Z06 air-box lid. When I ran this I had yet to buy the Predator nor had I gutted the pre-cats yet either.

notice my crappy reaction time. AND this was the cars first time to the track as well as my first time at the track. Just think of the ET I can get with a little practice... maybe a 12.9 ???? :)

Oyea

I guess I'm confused about what a Converter actually does.

I was under the impression that your engine would have to be at a higher RPM before engaging the gears. For Example, if you had a 3000 Converter, it wouldn't engage your rear end gears until you hit 3000 RPM's. If this is in fact the case, couldn't you keep your foot on the break, apply pressure to the gas pedal until 3k RPM and floor it / let off the break on a green light to do the same type of thing?

Sorry if I'm way off target, I'm a complete mechanical idiot. :crazy:

Mitch C

You don't have rev up to 3000 RPM for your car to move with a 3000 stall converter. It will only takes a couple of hundred more RPM to get moving. A 3000 stall converter will allow your engine to spin up to 3000 RPM instantly if you floor your throttle, instead of just 1600 RPM like a stock converter. Your engine makes a lot more power at 3000 RPM than it does at 1600 RPM, the more power you have on tap the faster your car will accelerate.




[Modified by Mitch C, 12:47 PM 6/25/2003]

TLewis4095

Years of logging every run including weather conditions from a weather computer. We run a race team and one of the cars is a 98 A4. We also work with many other racers on guiding them with mod choices and bracket racing instruction. :cheers:

lowprofiling

You don't have rev up to 3000 RPM for your car to move with a 3000 stall converter. It will only take one or two hundred more RPM to get moving. A 3000 stall converter will allow your engine to spin up to 3000 RPM instantly to 3000 RPM if you floor your throttle, instaed of just 1600 RPM like a stock converter. Your engine makes a lot more power at 3000 RPM than it does at 1600 RPM, the more power you have on tap the faster your car will accelerate.

[/QUOTE]

how is this set up driving around town, traffic, etc?

gmf

So going from a 3.15 to 3.42's how much time would you pick up in an A4?

Face

As long as you stay with a 3000 stall for a 3.15 rear, or 3500 for a 3.42 rear, it's just as streetable as stock. Once you get up to the 4000+ stall range, then you lose some streetability.

MaxPower

I agree 100% and don't forget you can always get a hard hitting verter (higher STR) to help out with a 2.73 or 3.15

Scissors

Listening to all of this, perhaps my next mod should be a new torque converter.

Okay...every mod has a drawback (other than price and install)...so what's the drawback to a higher stall/higher STR converter?


[Modified by Scissors, 2:29 PM 6/25/2003]

Oyea

Ok, so since I'm swapping out 3.15's with 3.73's, I'm not going to notice a difference without a converter?

If swapping out the gears means I'll do 13.25 1/4's instead of 13.27 1/4's. I'd prefer not to waste the couple 100's for the install and having to rent a car for 2 days. :confused: :confused:

Scissors

Well this is interesting...

In the Corvetteforum mall: Pro Torque Converter costs $695
From the original manufacturer's website: Same unit costs $367.67

:skep:

gmf

:confused: :confused:
I don't think the $367.67 quote is right. 695 is about right.