s4 na transmission power limits?
08-18-12, 10:39 PM
#1
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s4 na transmission power limits?
im making 250-260 rwhp, turbo 6 port. i stripped the a transmission gear(i think its called input gear) . i want to replace it with another s4 na trans, but is it going to last??
Btw trans that broke has 140,000 miles on it, and a damaged bearing.
Btw trans that broke has 140,000 miles on it, and a damaged bearing.
08-18-12, 11:01 PM
#2
will it last? how many licks to the center of a tootsie pop?
if you're worried, upgrade.
no one can answer this question with any integrity, the non turbo transmissions are hot garbage and usually break behind the non turbo engines with half that power. the turbo transmission? it is almost bulletproof to well above 350whp.
a transmission that is iffy to 200whp or a transmission that normally can handle 500whp with relative ease.. decisions decisions. if you look at the n/a transmission funny it falls over sideways, strips a gear or gets locked in reverse.
if you're worried, upgrade.
no one can answer this question with any integrity, the non turbo transmissions are hot garbage and usually break behind the non turbo engines with half that power. the turbo transmission? it is almost bulletproof to well above 350whp.
a transmission that is iffy to 200whp or a transmission that normally can handle 500whp with relative ease.. decisions decisions. if you look at the n/a transmission funny it falls over sideways, strips a gear or gets locked in reverse.
Last edited by RotaryEvolution; 08-18-12 at 11:04 PM.
08-19-12, 07:38 AM
#4
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AaronCake was pushing 400WHP through an N/A trans for a while, he blew two up and finally moved up to a TII trans.
Keeping the N/A trans is a Gamble, upgrading is not. All you have to do is get a TII flywheel, Trans, and a custom driveshaft to reatin the N/A rear end. Put down more power and you'll be risking that rear end too.
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08-19-12, 11:55 AM
#8
not really, even if you can possibly overcome one issue there are others inherent with the transmission itself. if you cryo the gears it is only marginally more durable but the case will always be weak. the reverse detent mechanism has no 100% fix and the box itself is just lightweight, something where weight savings isn't in your best interest.
08-19-12, 12:10 PM
#9
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if you don't do any hard launches, and are nice to it, it should live a while (i'd have no problems), but put some animal in there, and it'll break.
08-19-12, 12:18 PM
#10
yep, anything where you are snapping power through the drivetrain will break the weak link, in this case it is the transmission then the n/a half shafts.
if you roll on power without sidestepping the clutch then it will be much nicer to you in return. ie no hard drag launches, harsh quick shifts or clutch kicks to put you sideways otherwise the transmission will make you walk home.
if you roll on power without sidestepping the clutch then it will be much nicer to you in return. ie no hard drag launches, harsh quick shifts or clutch kicks to put you sideways otherwise the transmission will make you walk home.
10-27-12, 02:59 PM
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I believe the reason for failed front gears is a failed bearing, The front lower bearing was completely destroyed. That caused the shafts to separate under load, and that not a good thing.
For now i repalced the old s4 trans with s5 non turbo trans with mobil1 synthetic fluid(to keep those bearings happy), will keep update on how it holds up.
PS. Not doing 1st gear launches and no drag strip.
For now i repalced the old s4 trans with s5 non turbo trans with mobil1 synthetic fluid(to keep those bearings happy), will keep update on how it holds up.
PS. Not doing 1st gear launches and no drag strip.
10-27-12, 03:02 PM
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10-28-12, 12:36 AM
#18
S4 NA
S4 TII
S5 NA
S5 TII
Auto
Transmission
Yep
10-28-12, 08:17 AM
#19
Horse power does not break drive line components, it's the torque that does that. If you are going to build a 6-port turbo out of an n/a car, then you have to upgrade EVERYTHING from the clutch back to the axles, not to mention needed upgrades to other systems. Depending on the car itself, it maybe easier just to buy a T2 car and swap engines.
10-28-12, 10:44 AM
#20
Old [Sch|F]ool
I did the same thing with good bearings and half the WHP, N/A.
11-02-12, 09:09 PM
#22
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I have a N/A with some work done, have driven standard transmission vehicles for many years and still grenaded a gear in my car once. they don't like to be spun past 10,000 going into second.
05-12-13, 10:31 AM
#24
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FYI for those swapping TII transmissions onto NA cars, you can use the NA mount if it's in good shape. Only difference seems to be the location of the mounting holes to the body. In fact if you look at the mount, Mazda jus welds on a plate over the slot to make the mount either TII or NA. The rest is the same.
02-20-15, 12:19 PM
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I am so glad I found this thread. I am going tII in my vert, I was aming for 300 whp and keeping the s5 na trans and selling my tII trans and cluch, but I think I will dish out extra money for a flywheel and modified drive shaft for reliability.