Ping King

iTrader: (20)

good load for an M6 car? too much?

im looking to be able to load this turbo up at the drag strip. I currently have 4.11's and 325/50/15s i came from a nitrous/cam setup. I may be able to get a 3 series carrier with a 3.31 gear in it for my 12 bolt.

Any m6 guys have some input?

Josh@KY-Turbo

iTrader: (120)

I am not a M6. I have a TH400 and went with a 3.25 gear to help load the turbo. I have been told many times that a 3.50 gear is the best all around gear for a turbo car.

Old Geezer

iTrader: (3)

the turbo BUICK guys is the stock 3.42....
MANY have tried higher numerically, and switched back to the 42.....
I used it in my GN, with 28" tires. Worked well, and didn't rev the engine to the moon in the traps. [142mph]

Big Geek

iTrader: (2)

A couple of things to consider here. First, what gear do you want to cross the traps in. Once you figure that out do a little bit of calculating with your tire size, tranny gear ratios and ideal rpm (Where you are making your peak power.) and the gearing will stand out for you. I see allot of turbo guys that will run 3.73's with a 28-in tall tire only to realize down the road that they decreased their ET and increased their MPH by going to a numerically lower (3.23 and the like.) gear. I had 3.55 gears in my Mustang and ran a c-4 with a Cartech Outlaw kit (76-mm) on it. I dropped the gearing to a 3.08 and the car responded with a 9.28 vs. a 9.5xx and trapped a few mph higher. It also helped settle the car down when I left the line. Hope this makes sense. Take care.

Jim C.

engineermike

Again, not an M6 here, but I'm running a 3.00 with a 26" tire. I trap 146 mph at 6400 rpm and my hp peaks at 5700, so it's geared about perfect. Forget about "loading the turbo" and gear it to hit redline as you go through the traps.

Mike

Ping King

iTrader: (20)

so you think i should just gear it the same as a NA car in respect to hitting redline as i cross the traps?

my turbo is pretty large, its a large frame with a 76mm wheel. in first gear i get full boost by 4k rpm and it pulls for the rest of the run. Thats mainly why i was asking if i could benefit by going down in gearing.

I appreciate the input everyone, seems like everyone is running an A3 at this point lol.

6techniques

iTrader: (7)

i have a M6 right now (soon changing to A2/A3) and I agree with Mike on gearing it for the traps rather than the turbo...It just makes sense to do it that way because the gearing/tire size really dictate trap RPM, not the turbo.

Pro Stock John

iTrader: (34)

If you can get it cheap sure why not. A 3.31 and a 3.42 are not hugely different. Do they still make 3.31 gearsets, I had that gear in my 1970 Chevelle SS.

NA$TY-TA

iTrader: (21)

Is this a full spool 3 series carrier for a 12 bolt????

MIGHTYMOUSE

iTrader: (59)

yes, thanks.

there are quick and easy online calculators for this i just google any time i need to use.

3.31 on a 28" tire is waay too much, i bet 4.10 would even be fine for you depending on the cam

Ping King

iTrader: (20)

im running a 218/218 on a 114. Im limited to about 128mph on my rev limit. I have a 4 series carrier so i may just put a thin 3.73 in.




and no its not a full spool.

Pro Stock John

iTrader: (34)

I'd err on the side of running less gear, like 3.31 or 3.42, but that's just me.

cablebandit

iTrader: (37)

I got 3.55 but want to switch to a 3.08-3.27 for highway mileage

NA$TY-TA

iTrader: (21)

I though 3.73's were as low as you could go with a 4 series


i know it is when you are running a full spool with a strange 12 Bolt.

Thats why i asked....

Kyle

Pro Stock John

iTrader: (34)

If you are running a 4 series carrier the tallest gear you can run is 3.73 I think.

Zombie

iTrader: (2)

2.75's in the 9" checking in. Definately a cheap ger, got them for $25 off ebay lol. Highway driving is just a pleasurable cruise, 75mph is 2800 rpms on 25.6" tall tires = 2700 rpms. I still manage 1.5x 60's at the track on a 26x11.50x16 ET et street.

I changed from 4.10's to 3.42's to 3.50's to 2.75's and the car has 60 footed and been the fastest with the 2.75s. I have a friend with some 3.0's and they work reall well with a 26" tall tire, car went 10.20 @ 133 with a 1.50 60'

4.10's was as a 6spd
3.42's was as a 6spd
3.50's was as a 6spd and a3
2.75's is as a a3

NA$TY-TA

iTrader: (21)

I wonder how they would work with a 28" slick... and what u would cruise at with a 28" tire @ 75mph...

Zombie

iTrader: (2)

28's would cruise 75mph @ 2500 rpms, but I think 28" tall tires would be too much. I haven't tried though, I don't plan on going bigger than a 26" tall tire on 15x8" wheel.

fitz98ta

iTrader: (29)

i am running a 28" et drag and just changed from 4.10's to 3.73's.

At the track with 4.10's it wasn't the nicest. When the boost would come in and the car really start pulling it would be time to shift again.

Now i have yet to make it to the track yet with the 3.73's but i can say this, with the 3.73's on the highway with street wheels the car pulls WAY harder and longer. I am curious to see what the 28" slicks do with the gear change but i think it is going to be a lot nicer.

i had also thrown around the idea of the 3.42's but i figured with the price of a new carrier and new gear set i would start with the 3.73's and go from there. I don't think (with a M6 car) i would go any higher than a 3.42 though.

Josh@KY-Turbo

iTrader: (120)

That right there is the reason I went with 3.25's in the 9 inch. I can run my 315 BFG DR's on the street and the 28x10.5's at the track. Hopefully it will turn out to be the best of both worlds for my car.