Tire height for sublte gearing change...

[getblown5.9]

With 3.54's and 33's i can turn over 4k in 4th-low range, and a little under that with 2nd high on a good clay track.

I want a little more mph, but the cost of regearing is not an option right now. Thinking that if I go from 33" STS to a 35" BFG AT it wont bite as hard causing me to bog down, as well as the taller tire giving me more ground speed at the same RPM as I normally run.

Anyone try this and have good or bad results?

 

[97' CTD]

With 3.54's and 33's i can turn over 4k in 4th-low range, and a little under that with 2nd high on a good clay track.

I want a little more mph, but the cost of regearing is not an option right now. Thinking that if I go from 33" STS to a 35" BFG AT it wont bite as hard causing me to bog down, as well as the taller tire giving me more ground speed at the same RPM as I normally run.

Anyone try this and have good or bad results?

:hehe:.
Brandon

 

[getblown5.9]

sorry i didnt specify oh master of all sled pulling...

the tires arent new, half tread on them

 

[97' CTD]

sorry i didnt specify oh master of all sled pulling...
the tires arent new, half tread on them

:hehe: I wish.

Sounds to me like you are on the right path, I would say run the 35's see the results.
Brandon

 

[getblown5.9]

:hehe: I wish.

Sounds to me like you are on the right path, I would say run the 35's see the results.
Brandon

LOL

yea this track is very tacky, with a heavy sled it will snuff stock turbo trucks. the STS's seem to use alot of power on that track

BTW-you cant text a brotha back?

 

[Ragged Edge]

LOL

yea this track is very tacky, with a heavy sled it will snuff stock turbo trucks. the STS's seem to use alot of power on that track

BTW-you cant text a brotha back?

you have a 6 gear trany

 

[zstroken]

you have a 6 gear trany

I think 7 if you count reverse!:hehe:

 

[getblown5.9]

yes, my normal go to gear for most tracks is 4th-low, if its loose ill run 2nd-high...and i suppose if it was extremely loose I could pull off direct gear which is 5th-low.

 

[Kman9090]

I would think you have plenty of power to go 5th low with the sts's!

 

[getblown5.9]

I would think you have plenty of power to go 5th low with the sts's!

not with 3.54's and this sized charger

 

[HIGH TECH RAM]

You'll gain MPH at the same rpm but, Your 3.54 ratio will drop down a bit.

 

[Kman9090]

What size charger? Bigger then an S476?

 

[Ragged Edge]

I would think you have plenty of power to go 5th low with the sts's!

SH!T I'm way under powered then

 

[NOfullpullEL]

Changing tire size is for fine tuning. If you need more rpms or less i would go with a gear change then mess with the tire size. U need to figure out final drives and go for the rpms u want or need to carry down the track. Hope this helps ive only hooked once or twice in the past.:hehe:

 

[mech2161]

4000 rpm
4th low 29.32 mph
2nd high 32.82 mph

3500 rpm
5th low 35.68 mph

I'm trying to figure out the same thing. I going to ditch the ProComps and go STS's. Trying to decide on size. My wheel speeds are close to what I posted for TJ but I have 3.73's. It just blows to tires away now.

 

[Kman9090]

How many times have you tried 5th low?

 

[01smoker]

How much more are you increasing your chances of breaking driveline parts by goin to 35's?

 

[getblown5.9]

How many times have you tried 5th low?

none, i snuff the charger in 2nd high which is 11.9:1 final drive, 5th low is a 9.6:1, i could only pull it off on a super loose track, like dust or mud

How much more are you increasing your chances of breaking driveline parts by goin to 35's?

with half worn bfg's on aluminum wheels i dont see it being a ton more stress than some good biting STS on heavy steel wheels. the rear driveline can take it- one piece DS with 1480 joints, mini spool, and larger 37 spline axles

 

[getblown5.9]

Changing tire size is for fine tuning. If you need more rpms or less i would go with a gear change then mess with the tire size. U need to figure out final drives and go for the rpms u want or need to carry down the track. Hope this helps ive only hooked once or twice in the past.:hehe:

changing to 4.10's would net me nothing that 3.54's cant do at this point, it just moves my 4th low ratio to 2nd hi, and my current 2nd-high ratio to 5th low.

next jump is 4.88's, leave me with only one gear ration to run and thats 5th-low


my rpms run right where i want them to, 3700-4200 depending on track conditions, what i am hoping to do is gain some MPH at those rpms by going to a tire that is 2" bigger. best of all the tires are free, but if its not going to gain me anything then i wont waste my time switching them out.

 

[mech2161]

What you'll gain in tire size will be negated if they don't bite. I'd have to look at the charts I have at home but the difference in size is equal to half the difference between 4th low and second high. When you go to 5th low it's a bigger jump in final ratio.