I know they are no good for a turbo setup because they don't give it time to spool but I can't find any info on gears for a supercharger. I don't see why they wouldn't work other than traction problems and maybe running out of gear in the 1/4 but that could be fixed with a larger tire. Any info on this would be helpful. TIA.

 

Rufretic, I pretty much heard the same thing you did so that is why I went with 373's.

 

Your m6 so it will be different than my setup with a SS4000 stall but how do you like them? Have you tried your setup at the track?

 

I have my car at EPP right now so I'll have to get back to you on that, but from what I have heard 373's are the way to go...

 

I have 4.11's but really think i'd like to go back to 3.73's. In the 1/8th, my car tops out at 90mph in 3rd, just before the traps. This is with serious traction problems, so I think 3.73's would be just enough to pick up 10mph in 3rd once I get it hooked up with DR's and LCA relocation mounts.

The previous owner told me he ran 11.3 @123 in the 1/4, and he also hit the limiter before the traps, with traction issues off the line. I have never taken the car to the 1/4, but i'm sure if I get it that fast it will be the same.

If you check out the "sticky" on changing gear ratios, it will make sense to you. Everything i've experienced with my car is right on within 2mph.
https://ls1tech.com/forums/attachmen...chmentid=41066

The biggest thing I've noticed is once you get into boost, around 3000rpm or so, it will hit 6500 before you know it. I don't think dropping to 3.73's will have a huge effect on this, but I think it may make 1st gear a little more useful. Just my opinion from my summer DD.

 

when your putting that much power to the ground i would go with a bigger gear especially if you plan on running it on the street at all. i have 3.73's and when i break my rearend i am going with a 3.42 altho i am soon to be turbo.

 

ss1, good info.

I'm guessing those graphs are with stock size tires. It looks like I might be able to get away with the 4.10s if I up my shift points to around 6900rpm and put on a 28" tire. The only issue would be traction in 1st but I have full heavy duty susspension so it might hook ok. I guess I could always try it and change them out if need be.

markp03, I plan to put down around 550-600rwhp so its not that much compared to the turbo guys. The plan is to stay in the power range in each gear, the stall should help with that. It's not the same as the turbo setups that need the extra time in each gear to spool up the turbo. I actually like the lower gears better for the street because my stall doesn't feel so loose. Although 3.73s might still be the better bet so I don't have to shift so high and it should be easier to hook.

 

On Wahuskers blower car 4.10s were to much gear and he had to shift into 4th about 100-200ft from the trap's. I want to say he was pushing 126-128 in the traps in 4th gear. He is just over 550RWHP

 

What size tire? Shift rpm? I obviously want to stay away from shifting into 4th.

 

4.10's and a blower = FUN !!!

 

Yeah, lower gears and a supercharger are fine... like you said, it just doesn't "load the turbo" to spool a turbo, that's all... If you're looking at 450rwhp or so, 4.10's would be fine, especially with a 6 speed, you'd get an amazing 60' time if you could hook it up and you can shift, and end up in 5th gear going through the traps, it's up to you. I would run a little taller, and run through the traps in 4th gear, if it were me.

 

I'm an A4 with a 4000 stall.

 

335/30 Hoosier Drag Radials. You I am not sure where he is shifting now

I will hav ehim check in here

 

the most gear you need is a 3.42.

 

Agreed, with the blower you shouldn't need much more than the 3.42, or a 3.50 gear with a 9"

 

Thanks everyone, but some of you are missing the point of this post. I know 4.10s are not the best choice but they are what I have now and I'm just wondering how they will be. I don't want to have to switch gears unless I have to.

 

i ran a 6sp w/ 12-bolt & 4.10s on my old Vortech YSI setup and it was fine on a 28x10in ET Street then went to 3.42s for the turbo. Not really sure bout an auto but if you plan on 550-600rwhp then go down to at least a 3.73 gear. all IMHO

 

they will be absolutely worthless that is what we are saying. you will tag the rev limiter so fast and not even be able to build boost. that with a 4000 stall is just too much.

you can find out the hard way when a regular bolt on car beats you pretty bad out of the hole when you're just spinnning..

 

Do the 3.73 gears. Best of both worlds IMO (between 3.42 and 4.10).

 

Get ahold of Wahusker. He has ran all three offered in a 9in. with 4.10s and the power level you are looking at they are to much for drag racing but alot of fun over all