Limited slip diff + boost, which transmission is best?
03-05-2012, 06:36 PM
#1
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Limited slip diff + boost, which transmission is best?
So I've decided their is no sense in making more power if i can't get it effectively to the ground first. That being said I've decided to purchase and install an LSD. My problem however is i don't know for sure what trans is best to use, or which lsd to purchase.
At the moment i am making nut hairs shy of 300whp, and when i build another engine intend on being around 500whp. I currently have a stock GSR transmission. That being said i am hoping to get some insight from people who have already done this, would it be better to stick with the GSR trans, or purchase an LS trans with the slightly longer gearing and final drive. I've read both sides of the story, longer gears for boost are better bla bla bla, and people who say just the opposite. The car will see some track time, but i intend it in NO way to be a track only car. Thoughts on what trans to go for, or points i should consider that maybe I'm not thinking of would be appreciated.
Secondly, which LSD would work well for my application. I've read that obx/phantom grip is not good/bad ju ju, mfactory is pretty darn good, and of course quaife is excellent. If its necessary and/or truly worth it i will go with the quaife unit, otherwise if there is something else out there which has proven functional/reliable at these power levels please do share with me lol.
At the moment i am making nut hairs shy of 300whp, and when i build another engine intend on being around 500whp. I currently have a stock GSR transmission. That being said i am hoping to get some insight from people who have already done this, would it be better to stick with the GSR trans, or purchase an LS trans with the slightly longer gearing and final drive. I've read both sides of the story, longer gears for boost are better bla bla bla, and people who say just the opposite. The car will see some track time, but i intend it in NO way to be a track only car. Thoughts on what trans to go for, or points i should consider that maybe I'm not thinking of would be appreciated.
Secondly, which LSD would work well for my application. I've read that obx/phantom grip is not good/bad ju ju, mfactory is pretty darn good, and of course quaife is excellent. If its necessary and/or truly worth it i will go with the quaife unit, otherwise if there is something else out there which has proven functional/reliable at these power levels please do share with me lol.
03-05-2012, 06:42 PM
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Re: Limited slip diff + boost, which transmission is best?
Spend the money on a Quaife LSD, or you'll be kicking yourself when you have to replace friction discs inside the LSD. The GSR transmission is fine for what you want to do.
03-05-2012, 06:50 PM
#3
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Re: Limited slip diff + boost, which transmission is best?
I guess i'm also curious in order to keep a happier highway cruising rpm would going with an ls trans make much of a difference. I mean on paper they aren't that different really, i had one in my old hatch, but i'm just not sure if the gain in top end speed is worth it/noticeable when compared to a gsr.
03-05-2012, 07:40 PM
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Re: Limited slip diff + boost, which transmission is best?
If you're thinking about the LS tranny purely for highway crusing, you can have the best of both worlds. Keep the GSR, and while you're putting the Quaife in it, also swap in the 5th gear set from an LS. Shorter GSR gears for acceleration, reliable LSD, and a nice tall 5th for crusing.
03-05-2012, 08:30 PM
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Re: Limited slip diff + boost, which transmission is best?
That's your friend. http://shop.synchrotech-transmission...8.qscstrfrnt04
03-05-2012, 08:31 PM
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Re: Limited slip diff + boost, which transmission is best?
03-05-2012, 08:34 PM
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Re: Limited slip diff + boost, which transmission is best?
Something to keep in mind. The GSR and ITR transmissions have a different differential than the LS and B16 transmissions. The case is different also to house this different, stronger differential. So when you buy an LSD, pay attention. I was going to use an LS trans I got in a trade for the housing to swap a GSR gear set in...turns out that's not going to work.
You have various choices for the LSD. There's the viscous fluid diff, helical gear and clutch pack. There has been talk of rebuilding the OBX to better quality than from OBX...but I do not know how good, as there's still other components that could be an issue and they are known for having stripped bolts from the factory.
For gearing, the GSR and LS have different final drive gears and differentials. The GSR is a lower ratio... I think swapping in the LS 5th gear set is an excellent idea. The drone of cruising at 65mph on the interstate gets annoying even with a fairly quiet exhaust. Swapping a whole LS trans in is a bad idea, it's not as strong and less gear reduction will make it slower. A theoretical higher top speed is irrelevant, you can go over 100mph easily on a gsr trans...
You have various choices for the LSD. There's the viscous fluid diff, helical gear and clutch pack. There has been talk of rebuilding the OBX to better quality than from OBX...but I do not know how good, as there's still other components that could be an issue and they are known for having stripped bolts from the factory.
For gearing, the GSR and LS have different final drive gears and differentials. The GSR is a lower ratio... I think swapping in the LS 5th gear set is an excellent idea. The drone of cruising at 65mph on the interstate gets annoying even with a fairly quiet exhaust. Swapping a whole LS trans in is a bad idea, it's not as strong and less gear reduction will make it slower. A theoretical higher top speed is irrelevant, you can go over 100mph easily on a gsr trans...
Last edited by NotAJDMFanBoy; 03-06-2012 at 09:11 AM.
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03-05-2012, 10:20 PM
#8
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03-06-2012, 01:10 AM
#9
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Re: Limited slip diff + boost, which transmission is best?
If it were purely a track car i would say go with the b16 the shorter gears actually help you at the track with your overall powerband....LS tranny for boost solely for the purpose of longer gearing is old school way of thinking. You would be best served to keep your Gsr transmission and do more research on which LSD would be best suited for your build.
Consider warranty, customer service, craftsmanship, and get some opinions from people who have done/are doing and using what you are going to use for your application.
Consider warranty, customer service, craftsmanship, and get some opinions from people who have done/are doing and using what you are going to use for your application.
03-06-2012, 01:41 AM
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Re: Limited slip diff + boost, which transmission is best?
Sorry MFactory guy, I've never used one of your diffs - I only have experience with Quaife 
MFactory is a decent choice in LSD as well from what I've read, just stay away from OBX. I personally consider OBX and Blox barely a step above eBay, and wouldn't trust them for anything that could fail catastrophically.
Seriously though, GSR transmission, LS 5th gearset.
MFactory is a decent choice in LSD as well from what I've read, just stay away from OBX. I personally consider OBX and Blox barely a step above eBay, and wouldn't trust them for anything that could fail catastrophically.
Seriously though, GSR transmission, LS 5th gearset.
03-06-2012, 03:33 AM
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Re: Limited slip diff + boost, which transmission is best?
MFactory is defintely at least as good as Quaife if not far above quality next to the Quaife.
To use OBX in the same sentence as either is insulting to both.
Synchrotech and many other transmission building companies on this website would tell you as they've told me the MFactory unit is superior.
To use OBX in the same sentence as either is insulting to both.
Synchrotech and many other transmission building companies on this website would tell you as they've told me the MFactory unit is superior.
03-06-2012, 06:09 AM
#13
Re: Limited slip diff + boost, which transmission is best?
I would stay with the GSR trans and install an MFactory Helical LSD.
If you want the lower RPM's on the freeway, use an LS 5th.
I have been dealing with MFactory for several years and I can honestly say that their LSD is an excellent part and the best choice.
If you want the lower RPM's on the freeway, use an LS 5th.
I have been dealing with MFactory for several years and I can honestly say that their LSD is an excellent part and the best choice.
03-06-2012, 08:03 AM
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Re: Limited slip diff + boost, which transmission is best?
Something to keep in mind. The GSR and ITR transmissions have a different differential than the LS and B16 transmissions. The case is different also to house this different, stronger differential. So when you buy an LSD, pay attention. I was going to use an LS trans I got in a trade for the housing to swap a GSR gear set in...turns out that's not going to work.
You have various choices for the LSD. There's the OEM ITR viscous fluid diff, helical gear (Quaife I think), and clutch pack. Quaife is definitely known as being the best, at least compared to MFactory and OBX. Though there has been talk of rebuilding the OBX to better quality than from OBX...but I do not know how good, as there's still other components that could be an issue and they are known for having stripped bolts from the factory.
For gearing, the GSR and LS have different final drive gears. The GSR is a lower ratio... I think swapping in the LS 5th gear set is an excellent idea. The drone of cruising at 65mph on the interstate gets annoying even with a fairly quiet exhaust. Swapping a whole LS trans in is a bad idea, it's not as strong and less gear reduction will make it slower. A theoretical higher top speed is irrelevant, you can go over 100mph easily on a gsr trans...
B16 and ITR, I think too short of gears for boost.
GSR, perfect. Short and nice to have fun with in the city out of boost, but not too short to where you just spin tires in boost shifting.
LS, I would think too long. Not a huge difference, but the final drive is longer and less reduction will mean less torque at the wheel.
You have various choices for the LSD. There's the OEM ITR viscous fluid diff, helical gear (Quaife I think), and clutch pack. Quaife is definitely known as being the best, at least compared to MFactory and OBX. Though there has been talk of rebuilding the OBX to better quality than from OBX...but I do not know how good, as there's still other components that could be an issue and they are known for having stripped bolts from the factory.
For gearing, the GSR and LS have different final drive gears. The GSR is a lower ratio... I think swapping in the LS 5th gear set is an excellent idea. The drone of cruising at 65mph on the interstate gets annoying even with a fairly quiet exhaust. Swapping a whole LS trans in is a bad idea, it's not as strong and less gear reduction will make it slower. A theoretical higher top speed is irrelevant, you can go over 100mph easily on a gsr trans...
B16 and ITR, I think too short of gears for boost.
GSR, perfect. Short and nice to have fun with in the city out of boost, but not too short to where you just spin tires in boost shifting.
LS, I would think too long. Not a huge difference, but the final drive is longer and less reduction will mean less torque at the wheel.
03-06-2012, 09:07 AM
#15
03-06-2012, 09:22 AM
#16
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Re: Limited slip diff + boost, which transmission is best?
run the gears that best fit your build. we would need more details on your setup along with a dyno chart that shows power vs rpm if you want us to suggest whether a B16, GSR or LS transmission would have the best gearing for your application.
03-08-2012, 08:28 AM
#18
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Re: Limited slip diff + boost, which transmission is best?
Yea, some of the posts I'm not going to bother trying to reply to... but at least I'm getting some comments to work with. I did some more searching and seems like really either the quaife or mfactory unit would work very well, but seeing as how one is about $150 cheaper that might be my deciding factor. I'm leaning towards a precision 6262, and it's not going to pay for itself -_- lol
03-08-2012, 01:50 PM
#19
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Re: Limited slip diff + boost, which transmission is best?
gsr is the best went to the track this weekend picked up .500 seconds on less boost with a gsr tranny. i had a ls tranny befor
03-08-2012, 03:08 PM
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Re: Limited slip diff + boost, which transmission is best?
He doesn't know that. It would be mere speculation on his part, since he was only speaking from his personal experience on his car/setup. It depends on the power you are running and the slick hieght. GSR 4th gears are slightly longer than B16A, so if you want to keep your engine in it's power band instead of shifting to 5th before going over the trap line, that's the only way I can see them being better than B16a 4th gears.
03-08-2012, 03:14 PM
#22
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Re: Limited slip diff + boost, which transmission is best?
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