LC 200 fitting torque converter lock up?

Submitted: Thursday, Sep 25, 2014 at 16:28
ThreadID: 109611 Views:9614 Replies:4 FollowUps:7
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Hi All Wondering if any one has fitted a torque convertor lock up kit to the LC200 and if it is worth the money.
Towing a 3 T van
Does it improve fuel economy?
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Reply By: Member - Boobook - Thursday, Sep 25, 2014 at 16:57

Thursday, Sep 25, 2014 at 16:57
bobt123

There is a long discussion on this subject on LCOOL. you should join and take a look.

There is no doubt that it saves 2 - 4 l/100km much of the time. There are a couple of options and there are about 2000 other 200 related topics on the forum.

AnswerID: 539515

Follow Up By: bobt123 - Thursday, Sep 25, 2014 at 17:44

Thursday, Sep 25, 2014 at 17:44
Thanks i do some more research
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Reply By: DaveO*ST-R - Thursday, Sep 25, 2014 at 20:21

Thursday, Sep 25, 2014 at 20:21
I have just had the Wholesale Automatics "manual" kit fitted to my LC200. I have not had the opportunity yet to properly test it on a trip or towing. However, just around town trying it out indicates it is fantastic, with the TC locked & keeping the revs under control - no hunting up and down of revs with the TC continually locking and unlocking at the slightest hint of an incline. Fuel consumption - instantaneous readings on my Scangauge indicates a noticeable decrease in fuel use. I can see it a true bonus on the open road as to driveability and expected fuel savings. Worth the money? You bet !!!

There is also a automatic version (pardon the pun) available from a place in SA. Have a look at the following website where this fellow is building up his LC200. He also posts on the LCOOL forum. He has just fitted the automatic TC lockup himself and his review & video is very positive on the benefits of the lockup kit.

http://www.australianimages.com.au/project200/

I feel sure I will be just as impressed with the kit - when I eventually get the chance to get out on the highway and/or hook my camper trailer or caravan up.

Dave
AnswerID: 539524

Follow Up By: DaveO*ST-R - Thursday, Sep 25, 2014 at 20:26

Thursday, Sep 25, 2014 at 20:26
Forgot to mention as well - Transmission temps (as shown on my Scangauge) with the TC locked drop considerably - a true benefit when towing.

Dave
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Reply By: fisho64 - Thursday, Sep 25, 2014 at 22:23

Thursday, Sep 25, 2014 at 22:23
you need to be very careful with this.
The clutch on the torque converter on a 200 is not alot bigger that a CD.
It is not designed to take anywhere near the full torque of the engine, as is neither the transmission itself and why the ECU limits the torque when you stomp your foot down.
Its not a mod I would undertake lightly on my 200, given the expense of repairing the lockup clutch if damaged.
It certainly does keep the tranny cooler, as can be easily seen with a scangauge fitted.
AnswerID: 539528

Follow Up By: DaveO*ST-R - Thursday, Sep 25, 2014 at 23:53

Thursday, Sep 25, 2014 at 23:53
Could well be correct fisho64 which would be why Wholesale Automatics provide an instruction sheet with a number of do's and don'ts, one of which is the lockup is not to be used with more than 50% throttle application.
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Follow Up By: fisho64 - Friday, Sep 26, 2014 at 00:02

Friday, Sep 26, 2014 at 00:02
Which is what the ecu does-one twitch with the foot.
How do you quantify 50% throttle while driving?
Or when the son/daughter/valet/service guy etc drives it?
Dont worry, i dont have 100% faith that Toyota gets it correct.
Best bet would have been for Mr Toyota to get the gearing right-its way too tall, even another 100rpm at 100kph would be much better.
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Follow Up By: pop2jocem - Friday, Sep 26, 2014 at 10:11

Friday, Sep 26, 2014 at 10:11
It might be interesting to read the fine print supplied with the fitting and operating instructions for these kits.
Will the suppliers warrant to meet the costs of any repairs to failures that Mr Toyota won't if the kit fitment is found to be the cause.

Yeah, it may be an automatic but if it was me I would be doing what Alan H has suggested and "operating" the transmission when towing.
Keep in mind that when the aforementioned Mr Toyota designed the vehicle he had a heap of other criteria in mind other than you and me towing our home on wheels up hill and down dale.

Cheers
Pop
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Follow Up By: Elvin D1 - Saturday, Sep 27, 2014 at 19:15

Saturday, Sep 27, 2014 at 19:15
fisho64 replied:
you need to be very careful with this.
The clutch on the torque converter on a 200 is not alot bigger that a CD.
It is not designed to take anywhere near the full torque of the engine, as is neither the transmission itself and why the ECU limits the torque when you stomp your foot down.
Its not a mod I would undertake lightly on my 200, given the expense of repairing the lockup clutch if damaged.
It certainly does keep the tranny cooler, as can be easily seen with a scangauge fitted.

I have to agree with the fisho64 on this.

The L200 gearbox is the 6sp AB60f or Aisin TB68ls and is only rated to 650nms.The same box as used on the USA L200 with the 5.7 lt v8 petrol which developes considerably less torque.

I think it is no coincidence that the v8 4.5lt ttd motor has been tuned to develope only 650 nms as well to match the maxinum output of the gearbox.
The ECU has many features programmed in to help the gearbox shortfall as well.I think you tamper with this at your own peril.

Chipping this motor which is capable of enormous power increase would be equally foolish as the gearbox is already at it's maximun.

Elvin
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Reply By: Member - Alan H (QLD) - Friday, Sep 26, 2014 at 07:01

Friday, Sep 26, 2014 at 07:01
I tow using 4th - maybe go to 5th if out west on flat road. Never use 6th when towing.

If set on 6th the transmission will hunt up and down through the gears and rarely lockup. (it probably won't get into 6th)

This keeps the transmission at its coolest and seems to help consumption. It still heats up etc if dragging the van up the Toowoomba range but cools off quickly once over the range.

Alan
AnswerID: 539531

Follow Up By: bobt123 - Friday, Sep 26, 2014 at 07:24

Friday, Sep 26, 2014 at 07:24
Thanks for the quality responces i am towing this week to Deni am fitting scan gauge today and will record info before deciding on installing kit
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FollowupID: 824182

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