If you had a 3.9 is a 3.63 worth it?
Reply
0
0
ʎpunq qoq
Joined: Jan 2014
Posts: 604
Total Cats: 202
From: Western Australia
You don't usually use 1st at the track. I found the gearing is best if you can make 3rd to 6th useable so you are only using the right 'H'. It avoids the 2nd to 5th mis-shift which is common with the 6 speeds on the track. I can't imagine how a 3.63 would be quicker than a 3.9.
Reply
0
0
Not sure if I agree in this context, as it does not change the gear ratios, and the issue I think he's having is how close the ratios are on the track. With his power levels, he probably wants wider gears, as he makes the torque to pull wide gears. A 5-speed wide Quaife box is probaby the real solution here, but $$$$.
Reply
0
0
I've looked at the 3.63 and considered it in the past, but it was tough to justify the total price for such a small change in gear ratio.
Add up the cost to buy the gears and have them installed, then you've got a leftover 3.90 ring and pinion with minimal value to it. That gets you a final setup that's no stronger than where you started and slightly taller gears.
Compare that with a V8 roadsters getrag conversion, plus a getrag diff in one of many awesome ratios that's much stronger than stock. Then subtract the money you'd get from selling your full 3.90 torsen setup.
When you do the math those prices start getting awfully close for what seems to be a much stronger setup with way more options.
Add up the cost to buy the gears and have them installed, then you've got a leftover 3.90 ring and pinion with minimal value to it. That gets you a final setup that's no stronger than where you started and slightly taller gears.
Compare that with a V8 roadsters getrag conversion, plus a getrag diff in one of many awesome ratios that's much stronger than stock. Then subtract the money you'd get from selling your full 3.90 torsen setup.
When you do the math those prices start getting awfully close for what seems to be a much stronger setup with way more options.
Reply
0
0
Do you have specific corners at your local track that you are having problems with? Wheelspin in 3rd or running out of gear in a specific place? IMO 3.63s have a really narrow use case for track cars, and at your power level, I would expect 3.9s to be faster unless there's a specific corner or corners which would benefit from a taller gear.
Reply
0
0
I just installed a set of 3.6on my car (6speed) i really like it on the street, it will also keep me form banging on the limiter every lap (47sec) at my local track where i run the most often. We will see how it goes, next track day is on the 30th.
Reply
0
0
Thread Starter
Elite Member
iTrader: (16)
Joined: Oct 2006
Posts: 1,656
Total Cats: 526
From: Las Cruces, NM
Do you have specific corners at your local track that you are having problems with? Wheelspin in 3rd or running out of gear in a specific place? IMO 3.63s have a really narrow use case for track cars, and at your power level, I would expect 3.9s to be faster unless there's a specific corner or corners which would benefit from a taller gear.
Reply
0
0
Elite Member
Joined: Mar 2007
Posts: 5,298
Total Cats: 884
From: Santa Clara, CA
If you're competing on the track, then the question of 3.6 vs 3.9 depends on the track, power level, grip level, a zillion different things. It's hard to generalize
If you're doing track days, 3.6 vs 3.9 makes little difference.
If you're doing autox, 3.6 is a fairly big win over 3.9 because on most SCCA-style courses it will mean a lot fewer shifts into 3rd.
If you're driving around on the street a 3.6 is a lot less annoying than a 3.9.
--Ian
If you're doing track days, 3.6 vs 3.9 makes little difference.
If you're doing autox, 3.6 is a fairly big win over 3.9 because on most SCCA-style courses it will mean a lot fewer shifts into 3rd.
If you're driving around on the street a 3.6 is a lot less annoying than a 3.9.
--Ian
Reply
2
2
All-round "Good Guy"
Joined: Dec 2009
Posts: 1,036
Total Cats: 266
From: Brisbane, AUSTRALIA
If you're competing on the track, then the question of 3.6 vs 3.9 depends on the track, power level, grip level, a zillion different things. It's hard to generalize
If you're doing track days, 3.6 vs 3.9 makes little difference.
If you're doing autox, 3.6 is a fairly big win over 3.9 because on most SCCA-style courses it will mean a lot fewer shifts into 3rd.
If you're driving around on the street a 3.6 is a lot less annoying than a 3.9.
--Ian
If you're doing track days, 3.6 vs 3.9 makes little difference.
If you're doing autox, 3.6 is a fairly big win over 3.9 because on most SCCA-style courses it will mean a lot fewer shifts into 3rd.
If you're driving around on the street a 3.6 is a lot less annoying than a 3.9.
--Ian
(you missed a comma after "the street" in the last sentence, used "autox" instead of "auto-cross". and ", a zillion" should be " and a zillion", if "zillion" can be considered a word)
Reply
-1
-1
