has anyone adapted a 6speed auto to a 98 ls?
08-27-07, 12:40 AM
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has anyone adapted a 6speed auto to a 98 ls?
Just wondering...
Has anyone made such an adaptation??? its really tempting...
Can it be done??? does it bolt right on???
Same goes for the 95.. Can you adapt a a650 to a ls400 95?
Thanks
Has anyone made such an adaptation??? its really tempting...
Can it be done??? does it bolt right on???
Same goes for the 95.. Can you adapt a a650 to a ls400 95?
Thanks
08-27-07, 07:52 AM
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The purpose would be to do both... in reality... from the 4 speed to the 5 speed there is a HUGE diference in performance... you hit 135mph on 3rd vs 100mph on 3rd and 147 on 4th
It would give.. MORE performance and MORe economy to use the 6 speed over the 5 speed for the same reasons as 5th over 4th... The purpose is to convert both 4speed into 5speed or 6speed and 5speed into 6speed.
DIfference between the 6 speed would be
1-2 45
2-3 65
3-4 96
4-5 126
5-6 don't know as per specification vehicle is LIMITED.
So there is a difference.. and i am quite sure that it will drop overall cruising revs making the car use less fuel on the highway.
It would give.. MORE performance and MORe economy to use the 6 speed over the 5 speed for the same reasons as 5th over 4th... The purpose is to convert both 4speed into 5speed or 6speed and 5speed into 6speed.
DIfference between the 6 speed would be
1-2 45
2-3 65
3-4 96
4-5 126
5-6 don't know as per specification vehicle is LIMITED.
So there is a difference.. and i am quite sure that it will drop overall cruising revs making the car use less fuel on the highway.
Last edited by cartechpr; 08-27-07 at 07:55 AM.
08-27-07, 01:47 PM
#4
The purpose would be to do both... in reality... from the 4 speed to the 5 speed there is a HUGE diference in performance... you hit 135mph on 3rd vs 100mph on 3rd and 147 on 4th
It would give.. MORE performance and MORe economy to use the 6 speed over the 5 speed for the same reasons as 5th over 4th... The purpose is to convert both 4speed into 5speed or 6speed and 5speed into 6speed.
DIfference between the 6 speed would be
1-2 45
2-3 65
3-4 96
4-5 126
5-6 don't know as per specification vehicle is LIMITED.
So there is a difference.. and i am quite sure that it will drop overall cruising revs making the car use less fuel on the highway.
It would give.. MORE performance and MORe economy to use the 6 speed over the 5 speed for the same reasons as 5th over 4th... The purpose is to convert both 4speed into 5speed or 6speed and 5speed into 6speed.
DIfference between the 6 speed would be
1-2 45
2-3 65
3-4 96
4-5 126
5-6 don't know as per specification vehicle is LIMITED.
So there is a difference.. and i am quite sure that it will drop overall cruising revs making the car use less fuel on the highway.
also, youd have the added complexity of HAVING to use the LS430 engine ECU to control the transmission, and somehow using ur OEM LS400 ecu to control your engine.
and the reason the 4speed to 5speed has such a biyg difference is not due solely to the transmission, but mainly to the VVTi system toyota instaleld beginning in 98 which offered up a MASSIVE jump in both power and economy.
08-27-07, 01:54 PM
#5
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IMO You will never ever recoup the cost of the transmission swap during the lifetime of the car in potential gas savings.
Pure drifter is right on with the (HUGE) performance jump being primarily due to a big increase in HP / TQ with the VVT-I introduction in 1998... along with the 5 speed.
If you wanted to get an idea of what the potential performance increase due to tranny extra gears, you might look at a 2003 LS430 (with 5 speed) compared to a 2004 LS430 (with 6 speed) both with the same engine.
Keep in mind the electronics alone would likely make this a nightmare.
Having said that... go for it we'd all love to see it
Just make sure to have a backup daily driver for an extended period of time!
Pure drifter is right on with the (HUGE) performance jump being primarily due to a big increase in HP / TQ with the VVT-I introduction in 1998... along with the 5 speed.
If you wanted to get an idea of what the potential performance increase due to tranny extra gears, you might look at a 2003 LS430 (with 5 speed) compared to a 2004 LS430 (with 6 speed) both with the same engine.
Keep in mind the electronics alone would likely make this a nightmare.
Having said that... go for it we'd all love to see it
Just make sure to have a backup daily driver for an extended period of time!
08-27-07, 04:22 PM
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man.. why does everyone like the spider piggy?? ir eally love it.. i have it as a ringtone..
YOu know
I found my 95ls400 faster from 100-130 than the 98. I installed the headers on the 98 and i didn't find that much of a difference.. my car without headers on a 90F night did 15.19@93mph (or 96 not sure). With the headers is still untested. I never got the 95 to the track.. but it would have been interesting to see what it could do.
its a nice comparo for the ls430 which i will check out.. but i think they also had different rear ends...
How do you cope with the rev limiter when you change the gears??? that is one question i have been asking myself.. is there a way to bypass it... so it can rev say 7k?
my goal is to get my car to 14.8 @ 98 or so... as smoothly as possible.
More in favor of my point???
LS430 2004
according to lexus.com
curb weight 3,990 lb
Horsepower at rpm 290 hp @ 5,600
0-60 mph acceleration 5.9 seconds [17]
1/4-mile acceleration 14.5 seconds [17]
ls430 2001
according to lexus.com
Curb weight 3,955 lb
Horsepower at rpm 290 hp @ 5,600
0-60 mph acceleration 6.3 seconds[7]
1/4-mile acceleration 14.7 seconds[7]
.4 and .2 overall...
Considering the cost performance it may not be worth it.. but... accelerating from 100-130 must be a blast on that 6speed.
and didn't know the 2004 where ECU and TCU on the same unit.. Thought it was separate.
Time to check alldata.
After looking for a while... the 98+ do not have a TCM perse. its all inside the ECM.
the 95 backwards had a TCM for the trans only as the name implies...
interesting...
I guess you would have to retrofit the whole engine and trans with harness....
YOu know
I found my 95ls400 faster from 100-130 than the 98. I installed the headers on the 98 and i didn't find that much of a difference.. my car without headers on a 90F night did 15.19@93mph (or 96 not sure). With the headers is still untested. I never got the 95 to the track.. but it would have been interesting to see what it could do.
its a nice comparo for the ls430 which i will check out.. but i think they also had different rear ends...
How do you cope with the rev limiter when you change the gears??? that is one question i have been asking myself.. is there a way to bypass it... so it can rev say 7k?
my goal is to get my car to 14.8 @ 98 or so... as smoothly as possible.
More in favor of my point???
LS430 2004
according to lexus.com
curb weight 3,990 lb
Horsepower at rpm 290 hp @ 5,600
0-60 mph acceleration 5.9 seconds [17]
1/4-mile acceleration 14.5 seconds [17]
ls430 2001
according to lexus.com
Curb weight 3,955 lb
Horsepower at rpm 290 hp @ 5,600
0-60 mph acceleration 6.3 seconds[7]
1/4-mile acceleration 14.7 seconds[7]
.4 and .2 overall...
Considering the cost performance it may not be worth it.. but... accelerating from 100-130 must be a blast on that 6speed.
and didn't know the 2004 where ECU and TCU on the same unit.. Thought it was separate.
Time to check alldata.
After looking for a while... the 98+ do not have a TCM perse. its all inside the ECM.
the 95 backwards had a TCM for the trans only as the name implies...
interesting...
I guess you would have to retrofit the whole engine and trans with harness....
Last edited by cartechpr; 08-27-07 at 04:47 PM.
08-27-07, 05:20 PM
#7
man.. why does everyone like the spider piggy?? ir eally love it.. i have it as a ringtone..
YOu know
I found my 95ls400 faster from 100-130 than the 98. I installed the headers on the 98 and i didn't find that much of a difference.. my car without headers on a 90F night did 15.19@93mph (or 96 not sure). With the headers is still untested. I never got the 95 to the track.. but it would have been interesting to see what it could do.
its a nice comparo for the ls430 which i will check out.. but i think they also had different rear ends...
How do you cope with the rev limiter when you change the gears??? that is one question i have been asking myself.. is there a way to bypass it... so it can rev say 7k?
my goal is to get my car to 14.8 @ 98 or so... as smoothly as possible.
More in favor of my point???
LS430 2004
according to lexus.com
curb weight 3,990 lb
Horsepower at rpm 290 hp @ 5,600
0-60 mph acceleration 5.9 seconds [17]
1/4-mile acceleration 14.5 seconds [17]
ls430 2001
according to lexus.com
Curb weight 3,955 lb
Horsepower at rpm 290 hp @ 5,600
0-60 mph acceleration 6.3 seconds[7]
1/4-mile acceleration 14.7 seconds[7]
.4 and .2 overall...
Considering the cost performance it may not be worth it.. but... accelerating from 100-130 must be a blast on that 6speed.
and didn't know the 2004 where ECU and TCU on the same unit.. Thought it was separate.
Time to check alldata.
After looking for a while... the 98+ do not have a TCM perse. its all inside the ECM.
the 95 backwards had a TCM for the trans only as the name implies...
interesting...
I guess you would have to retrofit the whole engine and trans with harness....
YOu know
I found my 95ls400 faster from 100-130 than the 98. I installed the headers on the 98 and i didn't find that much of a difference.. my car without headers on a 90F night did 15.19@93mph (or 96 not sure). With the headers is still untested. I never got the 95 to the track.. but it would have been interesting to see what it could do.
its a nice comparo for the ls430 which i will check out.. but i think they also had different rear ends...
How do you cope with the rev limiter when you change the gears??? that is one question i have been asking myself.. is there a way to bypass it... so it can rev say 7k?
my goal is to get my car to 14.8 @ 98 or so... as smoothly as possible.
More in favor of my point???
LS430 2004
according to lexus.com
curb weight 3,990 lb
Horsepower at rpm 290 hp @ 5,600
0-60 mph acceleration 5.9 seconds [17]
1/4-mile acceleration 14.5 seconds [17]
ls430 2001
according to lexus.com
Curb weight 3,955 lb
Horsepower at rpm 290 hp @ 5,600
0-60 mph acceleration 6.3 seconds[7]
1/4-mile acceleration 14.7 seconds[7]
.4 and .2 overall...
Considering the cost performance it may not be worth it.. but... accelerating from 100-130 must be a blast on that 6speed.
and didn't know the 2004 where ECU and TCU on the same unit.. Thought it was separate.
Time to check alldata.
After looking for a while... the 98+ do not have a TCM perse. its all inside the ECM.
the 95 backwards had a TCM for the trans only as the name implies...
interesting...
I guess you would have to retrofit the whole engine and trans with harness....
u wanna run a 14.8, get a Lextreme or Dragon industries high stall Torque converter, a full Cat-back exhaust to go with those headers, and maybe do the lexkost intake mod.
and some good rubber on the rears.
oh, and u sure about pre 95s having a separate trans controller, im pretty sure it was al integrated into the ECU. ive never seen a transmission control unit for sale anywhere or in any lexus parts list.
and yea, 01+ is also complete ECU trans control integration, i remember the when millen did the IS430 show car they were having a hellish time running the V160 Getrag 6spd because the ECU was *****ing at not getting any trans info.
Last edited by PureDrifter; 08-27-07 at 05:24 PM.
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