veee8

iTrader: (40)

Where is the horse, because it has been beaten to death!
I run a 3.0 gear
Best so far for me leaving on 7 psi....
1.33 60ft
5.63 1/8th
8.84 1/4
28" tire and TH400, not bad at all to drive around on, slight delay in spool in 3rd gear, drop it into 2nd, and it is instant spool.

Mighty Mouse runs a 3.0 gear
4L80E
1.3X 60ft.
8.80 1/4

I am not going to say that all turbo cars need to run tall gears, but was a choice I made, and don't regret at all.

Tiago

iTrader: (27)

mine is a 6 speed, I think with an auto it wouldn't have the downsides that I am experiencing. The stall would hit the rpm I want anyways and GO!

I don't feel much difference driving around out of boost, feels about the same.

I run Mickey thompsons DRs now and they are the best tire I have had. Not willing to go to a more drag oriented tire, it just not a street setup.

At lower power levels you can get away with alot, but my MINIMUM boost still makes 1k to the ground...so I have to manage that power.

If I used the boost controller to cause "lag" so that I don't spin in the lower gear, if I ever rolled into it from a upper gear it would just suck. Its a balancing act and with t 3.08s I ahve found that its best to just have it hit as hard as possible on the 3.08s lol.

Its easier to make the car hook if you were pure drag racing, but when you mix the street with it, you have to make compromises and that is where you get the challange.

Vipers can fit a 345 rear tire which will allow ~200 more rwhp hook

I guess I will have to minitub my ****

MY99TAWS6

iTrader: (3)

I found the boosted lists..last ones were 2007.
Here is one entry not quite as good as your 60fts or times but very close with mid 3s gearing

"1998 Chevrolet Camaro Z28

Induction-
Type: Single PT88 T4
Manufacture: self-built truck manifold kit
Boost: 20psi
Intercooler: Ebay 24X12X4 Core

Performance-
Horsepower: 802rwhp @ 17psi
Torque: 738lbft @ 17psi
ET: 9.13
60': 1.391
330: 3.803
1/8: 5.849
mph: 119.627
1/4: 9.131
mph: 148.037

Engine-
Block: 370" Ironblock
Compression: 8.2:1
Oiling: Stock, Melling Pump
Crankshaft: Stock 3.622
Connecting Rods: Eagle H-beams w/arp2000 bolts
Pistons: Wiseco turbo duty, Ceramic coated
Cylinder Heads: L-92 Hand Ported by Franz Performance
Camshaft: Comp 228/228 .595/.595 115
Rocker Arms: Stock
Intake Manifold: L-92 Carb Style
Ignition/Computer: 02 Computer, Speartech Harness,Tuned by BLUECAT
Headers: 6.0 truck manifolds
Exhaust: 4" DP
Cooling System: Meziere Race pump, Griffin Radiator, 2600cfm fan

Fuel-
Pump: Dual Intank Walbro 255's
Injectors:95lb acceleronics
Rails:Speed Inc

Drive train/Transmission-
Transmission: th475, t-brake
Clutch/Converter:Yank PY3400
Driveshaft: Denny's Nitrous Ready
Rear Axle: Moser 9", 35 spline, locker, 3.55 gear

Chassis-
Front Suspension: PA Racing tubular k-member, uppers and lowers
Rear Suspension:Madman T/A, LCA's and Panhard rod, BMR Drag Swaybar
Brakes:Stock

Wheels & Tires-
Front Wheels:15x3.5 Prostars
Back Wheels:15x10 Prostars
Tires Front:26x7.5x15 MT Sportsmans
Tires Back:325/50/15 MT Drag Radials

Appearance-
Body:Stock
Interior:Wolfe 6pt converted into 10pt
Race Weight: 3500"

There are lots more cars running fast with 3.50s and some even with 3.7..Course you also want to geat for the mph and at the higher mph you do need lower gears or higher tires or both so you don't have to shift to overdrive in the 1/4.

So again to me it don't seem to be that critical to run low gears on a turbo unless a guy is super worried about the best possible et and 60ft. There is more to driviing a car for most people than 1/4 mile so it becomes how do they like the way the car feels around town and off boost.

If you guys like those low gears off boost then once again thats great. I don't and won't change out just to maybe get a bit better 1/4 or 60ft.

MaxxMitchell

iTrader: (15)

I'm running a 275/50/15 MT DR on both the street/track.

So you are just trying to hold against the brakes not flashing the converter?

I am holding against the brakes to try and get the turbo up, flashing the converter slows the car down about .2 in the 60ft.

You have no transbrake?
Yes but still on a 10bolt. Tested it once in a parking lot and that is what killed the 3.23s, lost over 1/3 of the teeth on the pinion.

MY99TAWS6

iTrader: (3)

Here is another fast car off the boosted lists with 3.7 gearing.don't seem to hurt him any on his 60fts..
Engine-

Type: Stenod Performance Built 347 ci, 8:5.1
Block: Aluminum LS1
Oiling: Melling High Volume
Crankshaft: Callies
Connecting Rods: Howards Steel
Pistons: Mahle Custom Turbo
Cylinder Heads: 6.0 Truck Ported
Camshaft: Stenod Performance Custom Turbo Grind
Rocker Arms: T&D 1.7
Intake Manifold: GM High Performance Carb Intake
Induction: Stenod Performance Custom Twin GT-40 Turbo Kit, 22 psi
Ignition/Computer: Stock
Headers: 5.3 Truck manifolds
Exhaust: 4” w/ 4” Bullet dumped before axle
Cooling System: Stock water pump, Griffin Radiator



Drive train/Transmission-

Transmission: Rossler TH-400
Clutch/Converter: Neil Chance Bolt together
Driveshaft: Dynotech Chromoly
Rear Axle: Billingsley Fab 9”, Aluminum Center, 40-spline gun drilled axles, spool, 3.70 gear



Chassis-

Front Suspension: AJE lower A-arms, Afco Shocks
Rear Suspension: Adj. Lower Control arms
Brakes: Aerospace up front, stock in rear



Wheels & Tires-

Wheels: 15x10 Weld Magnum 2.0 in rear, Weld Alumistars in front
Tires: 28x10.5-15 W in rear, ET Fronts



Body & Paint-

Paint: Artic White
Body: Stock
Interior: Stenod Performance Chromoly10 pt., Kirkey Seats
Race Weight 3500#"

1998 Pontiac Formula WS6



Performance-

Horsepower: n/a

Torque: n/a

ET: 8.998 @ 153.79
60': 1.384
330: 3.812
1/8: 5.810
mph: 123.52
1000: 7.535
1/4: 8.998
mph: 153.79

"

veee8

iTrader: (40)

I guess I don't understand, my car is faster then both of those cars with the deeper gears. So what is the argument?

Zombie

iTrader: (2)

So guys go really fast in the 1/4 with 3.0-4.10 gears. Seems like gearing doesn't affect turbo cars that much when it comes to track times.

I started a lot of gearing debates years ago by testing out 2.75's since I wanted to be streetable and drive the highway. Gearing a turbo car has a lot of variables.

The reason I went to 2.75s and saw improved track times was due to how slow my setup spooled. With 3.50's I could only leave on 1-2 psi due to wheel spin and it took forever to get to full boost, that equaled slow ET's. With the 2.75's I would build 7-10psi to leave the same, but it hooked and then the power came on faster because I was leaving on more boost. The result for me was higher average HP put to the ground.

Because my setup works much better now (and will improve even more after some changes) I could probably go back to my old 3.50 gears and run a better ET, but I'd never drive the car because I'd hate it.

Grr

iTrader: (2)

lol vee8, they need to update that list
On my GN, I found that if you drive alot on the street with an A4, the 3.08 is the optimal gear. I had 3.42s in there for the first year and it trapped very high, but i couldnt 60' since i had the stock 4l80 converter. It wouldnt hook on the street without DRs though and i put 300 miles a week on that car so that was a problem. I then switched to a 9" with 3.07s, and a fuddle 3400. This setup was perfect on the street, as i drove around on regular tires (Firestone Indy 500s) and this would basically dead hook if i left off idle. The car picked up a good 1.5 sec 1/4 mile on the street, which is all that matters. With my M6 car now i wouldnt go lower than the 3.70s i have in it though. Im picking up another GTO next week again and I found with my 04 that the 3.46 was actually optimal with the A4

MY99TAWS6

iTrader: (3)

Faster is not really the criteria. Faster can be a function of more power of course not just gearing.
60ft is better think to look at but then again that is highly dependent on suspension ,tires, track conditions.etc.

I was simply pointing out that those cars ran close to your or might mouses times and did so with 3.5 to 3.7 gearing so again can't really see the proof that low gearing like 3.08 or lower are that much more superior.With a different combo of trans brake,two step and stall etc might be even closer results.

I guess again it comes down to what you want from the car and what you use it for. If its track car where every tenth and best 60ft is main goal then that different from guy just wanted to drive on street who really don't care if he hooks up. I can throw on et street radials for when want to hook up better on the street,rest of time normal firestone wide ovals are good enough for me. Wheelspin has its fun component as well although wheelspin at like 100 plus mph can pucker up the old a hole pretty quickly!

This arguememt like the turbo cam arguments is not that black and white.
And like cams personal taste comes in. Zombie you didn't like the higher gears for whatever reason maybe you mostly do highway . I mostly do city and not into boost that much so to me lower gears suck and like to have some snap off the line to get my heavy *** car moving. Now its till m6 at the moment so really 3.73 gears would be even better. But since going auto figure the 3.54 will be just fine and not that many options with the dana 60 and I like my dana 60.

I think the vipers do run with 3.08 final gears though stock?? Course v10s have mega torque anyway down low.

1320

iTrader: (6)

Maybe to be clear, if everyone is gonna put their opinion out there they should be aware that lower gears are the HIGHER numerically. A low gear would be 3.73's and and EVEN lower gear is 4.10's. High gears are lower numerically. 3.08's are a high gear and 2.73's are a HIGHER gear.

Sorry, its just that half the people are misusing the terminology (backwards) which hurts the understanding even more, esspecially for those just reading.

Zombie

iTrader: (2)

HIway gear are a HIGH gear, that's how i remember.

Just like with a stick shift, 6th gear is a high gear and low numerically.

veee8

iTrader: (40)

Tall=High
Deep=Low

Fireball

iTrader: (21)

I run 3.70s BUT I also have 30" tires

on a 28" tire, the same ratio would be a ~3.42

HUNTER02SS

iTrader: (24)

I will be running a 2.75 rear gear in my new setup. I have run 3.50 gears and they worked out great, but to much rpm for me on the interstate.

Zombie

iTrader: (2)

Don't even start that game, we'll really get everyone confused!

V-seriesTech

iTrader: (5)

curveball


I'm a victim of circumstance. If I break something, and have another replacement something layingaround,...I use it.

I was running around on the street making not so crazy numbers on boost, running a 3.42 gear on 346cubes and two pt67's. Once I'd hit boost,..it'd blow the tires of the car,...at speeds of over 140mph. I can't have that cause I always don't run a sticky tire(soon to change). Anyways,...it was unuseable racing a bike cause i'd have to pedal the **** out of it to keep it straight. I broke that 3.42. I had a 2.73 diff laying around. Whatever.....lets do it. Through in my hardenedshafts and had at it.

I noticed no difference in how the car drove around town at all. It felt,..to me,...exactly the same,....minus the factor that the gears were way longer. I liked it. I put the car in 6th gear at 1000rpms,.....and was doin roughly 50-55mph.

More importantly,...my power is completely useable with Z rated 335's at high speeds finnally,....not to mention,......from a 35mph roll with drag radials,...the car will ******* straight up rape face. Doesn't spin but just a little in 1st. I run a non turbo friendly cam...and a set of gears that everyone told me not to run. On a car with a couple of big *** turbos that "would never spool".

The cam, the gears,....best choices I ever made for my car. Now, with more power coming down the road,...the gears are looking better and better by the moment.

52172

iTrader: (2)

Most popular gear for turbo six speed is 3:55 or 3:42 depending on rearend by far. With an auto you can go even lower numerically.

trans2000am

iTrader: (49)

ill be running a 390 lol not sure how its gonna do,when i get the money ill switch it unless some miracle it works

Sluggish

iTrader: (10)

I had 3.90s, if you only run a 26" tire it will only run about 134ish in 4th depending on your rpm limiter. Your car will go over 140 easy with that 80mm.

98Camarod

iTrader: (43)

I switched from the 4.10's in the 10 bolt to the 3.25's in the 9" and the spool up is about 700rpm faster than it was before. I probably won't be able to get to the track any time soon due to having a baby soon.