Speed limited? if so how to remove ... ??

[5150]

Hi guys,

This is my first post. I am about to pruchase a 1992/93 SC400 V8 for the express purpose of racing ....

I asume the factory ECU has some sort of electronic speed limiter in it. How do I go about eliminating this, and once done, should I still have the correct fuel, air and spark left to run the engine fast ... Also, does the rev limiter work in a similar fashion?


Cheers,
5150

 

[Moe]

i think by Unichip you can remove the speed limit

 

[sloshua]

Theres not a speed limiter on mine. I just had it to 176mph on the dyno this weekend. Its a US model 92 SC400. Dynoed 189hp 208tq bone stock with 200,000 miles. (226/260 if you count the spikes on gear change)

 

[Damien]

5150, will you be keeping the auto gearbox or converting to a manual? The Unichip can't remove the speedcut on the auto V8 Soarer but it might work with a manual transmission (I'm trying find out for mine). I know some guys who have used the Apexi RSM series 1 to do this on their autos... you can search the ALSC forum to find more info - www.lexus.australia.as

 

[sideshow]

the ecu has a speed signal input to it

maybe u can reduce the number of pulses that go to it

i havnt had a reason to do it on my 1uz

but i do have afew devices that will do the job

 

[COFFEE]

5150,
I was looking to resolve the same issue.
After hearing that some of the guys have tried some aftermarket speedcut eliminators and that they have worked but effected the gear changes i hesitated ?
Then after reading many of comments by Americans claiming there cars have been way over the 180km speedcut limit, i started wondring ?
What if the American ECU was placed in my car, would the speedcut be removed ?
If it did, i would expect that the gear shifts would be perfect as it's the factory ECU !

My only ? is what eles is different between the two models that may cuase issues ?
Would our cars using digital dash, emv and air suspension have any effects or the differences between pollution gear on the different models cause issues ?

Regards

Stephen

 

[morris]

This is supposed to work for toyota it might work for us.

speed unlimiter
http://www.urdusa.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=0007&Category_Code=

 

[COFFEE]

Morris,
Aparently the American model SC400's aren't speed limited ?
This unit is designed for US spec models would it work on *** variants ?

Regards

Stephen

 

[morris]

You got me I really havent researched it myself I just stumbled across it. I can get my GS400 up to 159 and really have no desire to go faster so I havent really looked at the issue to hard.

In Georgia they want to lock you up if you do over 100 on the HWY, so I am very leary.

 

[6spdSC4]

Here in Florida they will arrest you if you're doing 30+ over the posted limit!!!!! That's why I've only gotten my SC400 up to 125mph...what does that equate to in Kph? Something like 200 right?

 

[COFFEE]

6SPDSC4,
Well the max speed on our freeways is 110km/h.
100km/h= 58-60miles.
I have had mine sitting on the limiter ( 178km/h ) 3rd gear @ 5500-6000rpm.
Pretty smooth too, other than the annoying sound of the engine bouncing off the limiter !
Still want to see what it will get to !

Regards

Stephen