DR wheels and Tires.

[Leshik]

confused now

wow so much info, got me confused. So ok i figured that ill leave my 3.73 in for now and if i go boost i should switch to 3.55? or no?

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[higdominator]

Just have to test it and see if there is room for improvement. Look at the trap RPMS, peak power RPM and try to get a combo to get them to match up

 

[Burnin4]

3.55. Bone stock, 3.31 NA and 3.15 power adder any lower a gear ratio with stock auto even with stall slows you down

bingo. 3.55's are the fastest on stock cars, 3.31's will allow an n/a car to hold 4th through the traps, and 3.15's for FI setups although 3.55's will ET a little better through the 8th, mostly gained from a better 60ft from the higher gearing on the launch. 3.15's are top dawg for roll racing.

 

[2015 Silver GT]

bingo. 3.55's are the fastest on stock cars, 3.31's will allow an n/a car to hold 4th through the traps, and 3.15's for FI setups although 3.55's will ET a little better through the 8th, mostly gained from a better 60ft from the higher gearing on the launch. 3.15's are top dawg for roll racing.

3.31's will allow you to hold 3rd through the traps, not 4th. The extra shift into 4th is what you don't want with the 6R80 auto.

 

[Five Oh Brian]

The extra shift into 4th is what you don't want with the 6R80 auto.

What's wrong with 4th gear? The 3-4 shift (with a good tune) is instantaneous, so there's no time involved (unlike a manual transmission), and with a stall converter (which many of us who drag race regularly have) you're rpm's are right in the thick of the powerband. So, what's the harm in crossing the traps in 4th gear?

 

[Five Oh Brian]

My friend have a GT 2011 A6 with tune, Steeda CAI, Circle D 4000, X pipe with no cats, Dynomax muffler and 3.15 gear. He ran 10.98@122 on DR with 1.48 60' on good DA and between 11.2 to 11.3 on 2000 DA. The 3.15 his the best gear for drag racing with the 6R80.

I believe you left out some mods and/or your friend's car weighs many hundreds of pounds less than stock.

For a stock weight car & driver (figure about 3850 lbs), it would require 493 rwhp to go 122 through the traps. The mods you've noted are likely good for about 435 rwhp at the most, suggesting that the race weight of the car in question is really about 3,400 lbs (or, there are about 60 rwhp in mods you've neglected to list).

 

[Silver50Pony]

What's wrong with 4th gear? The 3-4 shift (with a good tune) is instantaneous, so there's no time involved (unlike a manual transmission), and with a stall converter (which many of us who drag race regularly have) you're rpm's are right in the thick of the powerband. So, what's the harm in crossing the traps in 4th gear?

Over drive Will lose races and reduce quarter mile times, reason why too low a gear ratio Will slow you down, seen it many times

 

[2015 Silver GT]

What's wrong with 4th gear? The 3-4 shift (with a good tune) is instantaneous, so there's no time involved (unlike a manual transmission), and with a stall converter (which many of us who drag race regularly have) you're rpm's are right in the thick of the powerband. So, what's the harm in crossing the traps in 4th gear?

There's nothing wrong with 4th gear as long as your crossing at the top of your power band. With your combination you're crossing the traps after your rpm's have dropped out of peak power. Thus the reason your times are not as good as everyone else's. If you like your gears that's fine, but you could be faster with less gear.

 

[pat5.0]

I believe you left out some mods and/or your friend's car weighs many hundreds of pounds less than stock.

For a stock weight car & driver (figure about 3850 lbs), it would require 493 rwhp to go 122 through the traps. The mods you've noted are likely good for about 435 rwhp at the most, suggesting that the race weight of the car in question really weighs about 3,400 lbs (or, there are about 60 rwhp in mods you've neglected to list.

The only weight reduction is the remove of the front sway bar. He still had 19'' front tire (and I was wrong, is best mph is 126.26 (but normally 122-123) [ame="[MEDIA=youtube]hCJPP5bTKB4[/MEDIA]"]

 

[bluebeastsrt]

126 miles an hour with minor bolt ons.

 

[pat5.0]

126 miles an hour with minor bolt ons.

Yes I know... On that run he as strong wind in the back. Normally in the 122-123 range.

 

[bluebeastsrt]

More info about the tune? C12-c16? Or start looking for the nitrous solenoids?

 

[pat5.0]

More info about the tune? Or start looking for the nitrous solenoids?

Lol...Custom tune, 94 gaz and no nitrous.
I have many exemple of what a good tune can do :

2011 A6, 3.15, only mod is same custom tune and DR : [email protected] (1100 DA)

One day this year, there hare a guy with a 2015 GT A6 at my track. He as the same DR than me, skinny in front, Airaid CAI, Magnaflow exhaust and a email tune (don't want to name it, but it's the most popular on this site...). I have only DR, Roush AB and tune. He run 0.2 and more than 1 mph slower than me...

 

[bluebeastsrt]

Oh I'm sure people can tune the bejesus Out of them. I'm more interested in the fuel used. I personally don't have the balls to run the tune to the edge and would hate to damage my wife's car. But the technology is out there.

 

[pat5.0]

Oh I'm sure people can tune can tune the bejesus Out of them. I'm more interested in the fuel used. I personally don't have the balls to run the tune to the edge and would hate to damage my wife's car. But the technology is out there.

In Canada, we don't have E85. The tune is for the best pump gaz we have, 94

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