n/t or turbo tranny faster??

1498 Views 20 Replies 6 Participants Last post by dsms4ever, Nov 30, 2005

dstnbmx

Discussion Starter · Nov 20, 2005

i have a 90 gs-t , i had the n/t tranny in my car before, but i put the turbo tranny back in..but the pressure plate slung apart at 7 grand and went through the bellhousing so im back to the n/t.....i know of the different geat ratios, but wouldnt the lower gear ratios make it faster, i remember before it felt slower.......anybody know for sure its been a while

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DRW

· #2 · Nov 20, 2005

The NT trans has lower gear ratios. It's also weaker, so don't beat on it.

dstnbmx

Discussion Starter · #3 · Nov 21, 2005

but there supposedly isnt any proof of this, all the turbo swap guys from n/t use the same tranny and just stage up the clutch........im lost i ruined my turbo tranny and have a n/t tranny clutch flywheel etc...ready to go in....

DRW

· #4 · Nov 21, 2005

If you saw the insides of the two trannies and compared them, you'd see which was stronger. The most obvious difference is the input shaft bearings; turbo trans uses tapered roller bearings while the NT trans uses ball bearings.

It's the ammount of power you're putting out, and how badly you get wheelhop that will determine if the nt trans will hold up or not.

DRW

· #5 · Nov 21, 2005

Oh and since you already have the nt trans, go for it. It's not like you can't use it, just be aware that it can't take as much abuse as a turbo trans.

BTW, what failed on the turbo trans?

dstnbmx

Discussion Starter · #6 · Nov 21, 2005

i dont know exactly why or how but the springs on the pressure plate went out or something and started grinding against the bellhousing ...well it blew a pretty good hole in it and blew my slave cylinder into oblivion.....i looked under the car and saw my flywheel ...through the enormous hole in the bellhousing

gvr4dsmer

· #7 · Nov 21, 2005

I ran a non-turbo trans for about 3 weeks in my 90' talon and it was quicker, I could spin to the top of 3rd while I can only spin just into 3rd with my turbo trans, but that's with an insert type lsd installed. The non-turbo IS weaker as mentioned above, but it works just fine. Throw it in already..

mavisky

· #8 · Nov 21, 2005

dstnbmx said:
but there supposedly isnt any proof of this, all the turbo swap guys from n/t use the same tranny and just stage up the clutch........im lost i ruined my turbo tranny and have a n/t tranny clutch flywheel etc...ready to go in....

There's proof now in the fact that I've killed 3 tranny's all from 3rd gear failures.

Here's unplanned video proof even. 3rd gear 2000rpm, wot and tranny strips teeth off at about 4500rpm, 20psi on a 14b.

Click here to see Video

Although the nt trans had higher ratios they almost made it harder to drive at the track. After switching from a 14b, smic, and the nt trans to an 18g , fmic, and the turbo trans I droped almost a full second from my e.t and added 8mph to my trapspeeds. I attribute some of that to the turbo transmission as both turbo's were at 20psi on cool afternoons.

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dstnbmx

Discussion Starter · #9 · Nov 24, 2005

how do you get 20 psi out of a 14 b? all i can get is 15-16

dstnbmx

Discussion Starter · #10 · Nov 24, 2005

yeah that sucks about your tranny. but i am not running the hp you are yet but when i get there i will just invest for a shep

mavisky

· #11 · Nov 25, 2005

dstnbmx said:
how do you get 20 psi out of a 14 b? all i can get is 15-16

Sounds like you have other issues besides the transmission then. Check for boost leaks or a severely leaking wastegate. Also check your boost controller to make sure its running right. I'd pulled as much as 22psi out of it on race gas.

mavisky

· #12 · Nov 25, 2005

dstnbmx said:
yeah that sucks about your tranny. but i am not running the hp you are yet but when i get there i will just invest for a shep

I killed the other trannys at closer to 15psi

. Investing in a shep transmission is a great idea, but that means you have to have the fwd turbo flywheel, clutch, starter backing plate (optional I guess if you like dirt and shit in your bellhousing), different engine mounts, and possibly different axles if you get a 93-94 tranny. May as well do it now and get it out of the way if you intend to make any power ever with this thing as the nt clutch won't hold boost anyways.

dstnbmx

Discussion Starter · #13 · Nov 25, 2005

well a shep is on the list , but it isnt top priority i cant afford it right now, i think the cheaper alternative for me is to get a stage 2 n/t clutch or stage 3 and run with that in for a while..........i am going to start building a motor here soon and when i put that one in ill put a shep in it then.

mavisky

· #14 · Nov 25, 2005

Do you realize that you don't just order up a new transmission from Shepherd racing? Although I'm sure you could, you usually send them one. You probably won't need one unless you hose up one you have.

The problem is that you're going to spend money to put a high strength clutch into a transmission that will fail. Then you have a clutch that won't work with the turbo transmission. Hell I still have an act 2600 clutch for an nt laying around somewhere that worked perfectly. Only problem was that the clutch was much stronger than the transmission. Then you'll have to buy a turbo transmission, fwd flywheel, and a brand new performance clutch. Why spend $300 on a performance clutch for a transmission that will just explode so you can sell the used clutch for pennies. I had my nt clutch for sale forever for $100 + shipping and got no buyers.

kissesonly4him

· #15 · Nov 29, 2005

i love you

mavisky

· #16 · Nov 29, 2005

Ummmm... Thanks I guess

Edit: wait you're from Georgia, please tell me that you're not this guy's gf, and that you didn't sign up on a dsm board with the name kissesonly4him, and then post in the two threads where he's being torn apart for his lack of dsm knowledge just to tell him that you love him.

bwwwahahaaahahhahaaa

dstnbmx

Discussion Starter · #17 · Nov 30, 2005

yes i realize you dont just order up a tranny from shepherd racing, you send yours in
yes i know the n/t tranny is weaker, although i did read that the n/t to turbo guys had no problems with it even with higher power levels. thats just what i read, i was only trying to figure out what was right because no i havent seen the insides of the two..

dstnbmx

Discussion Starter · #18 · Nov 30, 2005

all i am trying to do is use something that might not last forever until i can afford the better things...i see no problems with that and i dont appreciate your smart ass little comment...your an ass...this post isnt ripping me apart for my lack of dsm knowledge...i merely asked a question about things i had read before, checking other's opinions on it. and if my girlfriend wants to post a comment on here ladi fuckin da

mavisky

· #19 · Nov 30, 2005

dstnbmx said:
yes i realize you dont just order up a tranny from shepherd racing, you send yours in
yes i know the n/t tranny is weaker, although i did read that the n/t to turbo guys had no problems with it even with higher power levels. thats just what i read, i was only trying to figure out what was right because no i havent seen the insides of the two..

Show me one post or one thread from someone who's done the swap or is running on an n/t reliably at any moderate power level and has had no problems. Sure you might find an old post or two of mine where I was blaming bad tranny's, or my driving, but in the end it was the weak tranny at fault every time.

I have seen the inside of the two, so take my word for it. The nt tranny has completely different part numbers and for all intents and purposes is the weaker of the two transmissions.

mavisky

· #20 · Nov 30, 2005

dstnbmx said:
all i am trying to do is use something that might not last forever until i can afford the better things...i see no problems with that and i dont appreciate your smart ass little comment...your an ass...this post isnt ripping me apart for my lack of dsm knowledge...i merely asked a question about things i had read before, checking other's opinions on it. and if my girlfriend wants to post a comment on here ladi fuckin da

If you're going to use the nt transmission you may as well keep the boost extremely low and limp around on the nt clutch. It will hold very minimal boost. I'm trying to save you some money here. In the end you'll either be buying a new clutch and turbo tranny or end up constantly replacing the nt tranny's. If you don't have the money for the turbo setup now (btw, a local kid I'm helping just ordered the last fwd turbo engine backing plate in the country - sorry guys) then at least take it easy on the transmission and clutch so that you're not blowing your upgrade money trying to keep the weak things working to get you to your job and back. I tried to buy the fwd setup multiple times, but I went through the stock nt clutch, 3 nt tranny's, 2 cheap aftermarket clutches, and then onto the act before it became reliable enough (got a good tranny that held for a couple of months) and got a daily driver after it did break so that I could get the money around for the turbo setup. I'm trying to keep you from having the same headaches I did.

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