swap 4 speed AT for 6 speed AT?
#1
I'll snap his neck.
Thread Starter
swap 4 speed AT for 6 speed AT?
Since it seems that a big part of the slowness of the 4AT is the tall gearing, would it be feasable to put the 6 speed AT into the 4 port autos? If so, how much does a 6 speed tranny costs?
Has anyone actually driven both the 4AT and 6AT? Is the 6AT noticeably faster?
Just throwing out some ideas...
Has anyone actually driven both the 4AT and 6AT? Is the 6AT noticeably faster?
Just throwing out some ideas...
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moko (05-19-2024)
#2
'03 Dodge Viper
Well the 6MT is a 6 port motor too, so that's also a difference between the 4AT and 6MT. If you want a fast auto, boosting is your only option. Otherwise, get a manual.
I'm not really sure about swapping the gears, but I can't see it being too cheap. Who knows? I'm sticking with the 4AT gears so I have traction when I get more power.
I'm not really sure about swapping the gears, but I can't see it being too cheap. Who knows? I'm sticking with the 4AT gears so I have traction when I get more power.
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moko (02-15-2024)
#3
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Originally Posted by SlayerRX8
Well the 6MT is a 6 port motor too, so that's also a difference between the 4AT and 6MT. If you want a fast auto, boosting is your only option. Otherwise, get a manual.
I'm not really sure about swapping the gears, but I can't see it being too cheap. Who knows? I'm sticking with the 4AT gears so I have traction when I get more power.
I'm not really sure about swapping the gears, but I can't see it being too cheap. Who knows? I'm sticking with the 4AT gears so I have traction when I get more power.
as for is it do able? it probably is, but the money wouldn't be worth it for the gains (if any really)
i say keep patience and hope, there might be a supercharger for the auto in the future.
#4
I have an 06 AT. Never drove an 05 auto but after hearing all the problems the 04 and 05 autos had and the increase in HP of the 06, I thought it was a logical choice.
When I drive mine in Manual mode it moves quite well.
When I drive mine in Manual mode it moves quite well.
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moko (02-15-2024)
#5
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Best bet would be try to find a junkyard 6speed a/t rip the tranny and ECU out. Also having really good knowledgable friends would be a bonus. Paying someone outa your own pocket wouldnt be worth it really. I'd guess you'd be looking at 5k+ for the swap if you did it through buying from Mazda. I could definatly be wrong bout the ECU being needed but I'd imagine it would have the info for electornicly switching gears from the paddle shifters and such. In the future if my tranny ever dies I'd definatly look into this
#6
'03 Dodge Viper
Originally Posted by dillsrotary
reread the post, he wants to swap a 4 speed auto for a 6 speed auto.
as for is it do able? it probably is, but the money wouldn't be worth it for the gains (if any really)
i say keep patience and hope, there might be a supercharger for the auto in the future.
as for is it do able? it probably is, but the money wouldn't be worth it for the gains (if any really)
i say keep patience and hope, there might be a supercharger for the auto in the future.
Then you rephrased everything else I said.
#8
I'll snap his neck.
Thread Starter
OK, guys. Thanks. That's pretty much what I thought. But figure it didn't hurt to ask.
I'm thinking the petitt SC will probably be the best way to go, but I'm not sure yet.
I'm thinking the petitt SC will probably be the best way to go, but I'm not sure yet.
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moko (02-15-2024)
#9
'03 Dodge Viper
Personally I think Hymee's kit will be of higher quality, but it seems Pettit will finish first. Still, we can't know how the final product will behave in the field on everyone's car. I'll give each kit a fair chance.
#10
Originally Posted by Clavius
Best bet would be try to find a junkyard 6speed a/t rip the tranny and ECU out. Also having really good knowledgable friends would be a bonus. Paying someone outa your own pocket wouldnt be worth it really. I'd guess you'd be looking at 5k+ for the swap if you did it through buying from Mazda. I could definatly be wrong bout the ECU being needed but I'd imagine it would have the info for electornicly switching gears from the paddle shifters and such. In the future if my tranny ever dies I'd definatly look into this
Paul.
#13
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Originally Posted by rotarygod
I personally don't think a swap to a 6 speed auto transmission would be worth the effort. Not even if you could get the parts for cheap.
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Hmm, now I'm curious. May go drive the new 8. I have an 05 and was trying to wait for the 06 but it took so long to come out! The lease on my last car was up in June 05 I actually borrowed a car for a few months waiting for the 06 model to come out. Finally in Sept I bought the 05. Wasn't it well into 2006 before the 2006 model finally came out?
#17
Originally Posted by mdw1000
Since it seems that a big part of the slowness of the 4AT is the tall gearing, would it be feasable to put the 6 speed AT into the 4 port autos? If so, how much does a 6 speed tranny costs?
Has anyone actually driven both the 4AT and 6AT? Is the 6AT noticeably faster?
Just throwing out some ideas...
Has anyone actually driven both the 4AT and 6AT? Is the 6AT noticeably faster?
Just throwing out some ideas...
...within a few momets of doing that I look down and we were already pushing past 80mph. In a completely unscientific memory based guestimation, I would say the 4 speed auto may have been able to hit 65 in that same distance, plus it would of redline beeped doing it.
#18
Bummed, but bring on OU!
Mathematically, the 6spd's will be marginally faster. The gearing is a little better and it makes a bit more peak power, but low end power is lower and the final drive is taller. You might see 2 to 3 tenths of a second. Nothing to swoon over. I didn't like the 6spd transmission when I test drove the Mx-5. It was slow to downshift, and getting to a proper passing gear took too many shifts. Instead of dumping money into swapping transmissions it'd be better speent on forced induction, where tall gearing doesn't matter as much.
(and (to the above poster) at no point whatsoever will the 4spd redline at 65mph. 47, 81-82, 122-23 for 1st-3rd (fuel cutoff))
(and (to the above poster) at no point whatsoever will the 4spd redline at 65mph. 47, 81-82, 122-23 for 1st-3rd (fuel cutoff))
Last edited by therm8; 12-18-2006 at 04:19 PM.
#19
Originally Posted by therm8
47, 81-82, 122-23 for 1st-3rd (fuel cutoff))
Fuel Cutoff for 1st is 47mph
Fuel Cutoff for 2nd is 81-82mph
Fuel Cutoff for 3rd is 122-123mph
#20
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Originally Posted by Agent of Chaos
therm8: Am I interpreting this statement right?
Fuel Cutoff for 1st is 47mph
Fuel Cutoff for 2nd is 81-82mph
Fuel Cutoff for 3rd is 122-123mph
Fuel Cutoff for 1st is 47mph
Fuel Cutoff for 2nd is 81-82mph
Fuel Cutoff for 3rd is 122-123mph
#21
I found out that the 4 speed is a stronger tranny. I test drove the 6 speed and the down shift was what changed my mind on buying one. Its been a while since but I rember it didnt downshift as early and that caused the car to not pull as hard out of the turns as when mine did when stock. You can drop it into 1st at 30 2nd at 70 and I never looked at the speedometer to see when it drops from 4th to 3rd. I just now that its governed at 126, damit and only tacks at 5500 in 4th. Hmm, remove govener by a flash. and I wouldnt be surprised if its capable of 160 mph.
#22
Not worth it, even if you could do it. Buy a used 4AT to save money or buy a new 6AT for possible upgrade value. But, I don't think its worth trying to swap.
1. 4AT would be cheaper to get your hands on.
2. If you go turbo or supercharger, there is nothing a 6AT would have on you. There are also arguments that the 4AT might be faster.
3. If you get the ECU flashed on the 4AT and remove rev and speed limit, again I don't see the 6AT having anything on you.
4. In Japan, the 6AT has only 5 HP more than the 4AT.
5. RAM duct (like one from RB) can be used to help get more air in at higher speed and its a cheap mod.
Its all about the tranny.
I don't think Mazda pushed the limits enough with the 6AT to make it such a big advantage. The limit still seems to be the tranny. The 6AT tranny is 7,500 rpm and the 4AT is 7,200 rpm.
If Mazda pushed the tranny on the 6AT to 8,000 to 8,500 rpm than you would see something. I would be interested in somebody with a 6AT that gets the ECU flashed (cut rev limit) and install a ATF cooler. I wonder if their performance numbers would be closer to the manual.
Well is there any 6AT guys that have tried it (ECU flash (rev cut) and ATF cooler)???
The 6AT makes sense from a Mazda production point of view. Basically, the automatic and manual are the same engine and have close configurations. You get the 2nd oil cooler, different gears, etc... If Mazda ever pushed the limit on the AT tranny, I think people would have a whole new view of the RX-8 Auto.
1. 4AT would be cheaper to get your hands on.
2. If you go turbo or supercharger, there is nothing a 6AT would have on you. There are also arguments that the 4AT might be faster.
3. If you get the ECU flashed on the 4AT and remove rev and speed limit, again I don't see the 6AT having anything on you.
4. In Japan, the 6AT has only 5 HP more than the 4AT.
5. RAM duct (like one from RB) can be used to help get more air in at higher speed and its a cheap mod.
Its all about the tranny.
I don't think Mazda pushed the limits enough with the 6AT to make it such a big advantage. The limit still seems to be the tranny. The 6AT tranny is 7,500 rpm and the 4AT is 7,200 rpm.
If Mazda pushed the tranny on the 6AT to 8,000 to 8,500 rpm than you would see something. I would be interested in somebody with a 6AT that gets the ECU flashed (cut rev limit) and install a ATF cooler. I wonder if their performance numbers would be closer to the manual.
Well is there any 6AT guys that have tried it (ECU flash (rev cut) and ATF cooler)???
The 6AT makes sense from a Mazda production point of view. Basically, the automatic and manual are the same engine and have close configurations. You get the 2nd oil cooler, different gears, etc... If Mazda ever pushed the limit on the AT tranny, I think people would have a whole new view of the RX-8 Auto.
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I found out that the 4 speed is a stronger tranny. I test drove the 6 speed and the down shift was what changed my mind on buying one. Its been a while since but I rember it didnt downshift as early and that caused the car to not pull as hard out of the turns as when mine did when stock. You can drop it into 1st at 30 2nd at 70 and I never looked at the speedometer to see when it drops from 4th to 3rd. I just now that its governed at 126, damit and only tacks at 5500 in 4th. Hmm, remove govener by a flash. and I wouldnt be surprised if its capable of 160 mph.
#25
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