rear gears for turbo set up...
10-16-2008 | 07:43 PM
#1
rear gears for turbo set up...
Im getting everything set up for my upcoming t56 swap and i need to chose a gear ratio for my truck...i originally planned on something like 4.88's but now that ive gone a different route and am going to turbo charge my truck, i had read that the turbo setups like to be lugged a little bit...but seeing my truck is and ECSB with 20s with roughly a 30" tire on it, i didnt know what gears to use...
the motor is gonna be a foraged 408 and hope to get the KBracing front mount kit...so what do you guys think...4.56, 4.88, 5.13? oh and BTW, wheres a good vendor to get them from...I want to get a tru-trac as well while Im doing the swap...
thanks
the motor is gonna be a foraged 408 and hope to get the KBracing front mount kit...so what do you guys think...4.56, 4.88, 5.13? oh and BTW, wheres a good vendor to get them from...I want to get a tru-trac as well while Im doing the swap...
thanks
10-16-2008 | 07:57 PM
#3
...hmm maybe im confused...i thought the higher the numerical number, the lower the ratio, hence 3.73's would be A LOT of lag where as 4.88's or 5.13's wouldnt have any lag at all? but thats why im askin you guys...
10-16-2008 | 08:02 PM
#4
https://www.performancetrucks.net/fo...d.php?t=423653
I can't find the thread that talks about lag difference. but Spoolin went from 4.10s down to 3.42's.
I'll keep looking
I can't find the thread that talks about lag difference. but Spoolin went from 4.10s down to 3.42's.
I'll keep looking
10-16-2008 | 08:08 PM
#6
https://www.performancetrucks.net/fo...d.php?t=423653
I can't find the thread that talks about lag difference. but Spoolin went from 4.10s down to 3.42's.
I'll keep looking
I can't find the thread that talks about lag difference. but Spoolin went from 4.10s down to 3.42's.
I'll keep looking
Spoolin went from 3.23s to 4.10s to 3.42s with the 80E.
He is running quite a bit of boost so it might be a different game.
If I were you, I would leave it like it is to see where your over all gear ratio is. then decide which way to go.
10-16-2008 | 08:08 PM
#7
found it
I'm 2wd with 4.10's, but with this combo I'm not loading up the engine/turbo enough in 1st and 2nd gear to see full boost, and blow through the gears way too fast.I figure if I make my gearing a little shorter I can get better gas mileage, load up the turbo better in lower gears, and consequently stay in my power band a lot longer as well.I think I'm gonna get 3.42's. Power isn't my problem, it's the other things in my set-up.
After driving around for the last few days with it I can definitely say that yes it was! My truck feels stronger in every gear in AND out of boost which I wasn't expecting. I'm seeing a good load on the engine in every gear now and am able to make full boost in every gear but first which I'm still seeing 16lbs. Even around town driving it's much more enjoyable. Feels similar to dropping from a 3600 TC to a 2600 TC. I would recommend if for anyone pushing alot of boost or who have alot of Torque.And now I won't be shifting into 4th 120 feet before the beams at the track! Should be at the top of 3rd at around 120mph...hopefully! 
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10-16-2008 | 08:15 PM
#9
But remember he is goin with a T56..
Spoolin went from 3.23s to 4.10s to 3.42s with the 80E.
He is running quite a bit of boost so it might be a different game.
If I were you, I would leave it like it is to see where your over all gear ratio is. then decide which way to go.
Spoolin went from 3.23s to 4.10s to 3.42s with the 80E.
He is running quite a bit of boost so it might be a different game.
If I were you, I would leave it like it is to see where your over all gear ratio is. then decide which way to go.