TOP END is only 200 kph / 124 mph
 

All I can get out of my '89' 3L Turbo is

124 mph or 200 kmh (sorry the title states 142, I mean 124)

there is no tuning - just plain OEM.

Surely this is not right. Could it be something to do with UK Spec cars having a restrictor.

EDIT: My car is UK Spec and so shouldn't have restrictor maybe some UK members can enlighten me on this matter. I found the following info on http://www.btinternet.com/~netsurf/mr2t/mr2tfaq.html

Speed Restrictor:
In Japan there is a legal requirement for all cars to have a speed limiter at 180 km/h, which is equivalent to 112mph. Most Turbo owners report a top speed restricted to approximately 5,250 rpm in 5th gear (about 125mph), and is said to be based around cutting the spark to the engine.
The speed limiter can be removed, and amongst other companies Intech (see above) will do it for approximately ?180 + VAT, or this can be done as part of a Unichip ECU chip upgrade, which typically costs around ?380 + Fitting.
Note: Many owners report that a side effect of having a speed delimiter fitted is that the Power Assisted Steering can become over-light, as the car thinks it is traveling at a lower speed than it actually is. (This is because the speed signal is also sent to the PAS ECU, and is used to judge the amount of steering assistance to be given)
Any removal of the speed restrictor may require a subsequent change of speedometer, as it is reported that the needle will hit the bottom of the dial at about 120mph, and some owners have had problems with needles sticking there !


It sounds like it might be fitted with a restrictor. Its a Turbo and speedometer stays around the 125mph mark. It definately is only doing 124/5mph and is not that the speedometer hasn't been changed after the restrictor was taken off as described above.


Sure the top end of Golf GTI is 145mph. I know it is much lighter car though.

restrictors, in my experience, usually trigger a reasonable amount over max speed limit.. not nearly double. I've had restrictors/governors trigger about 90-95 mph... I think the highest I had was 100.. You said you're stock, and these cars are 20+ years old... 124 mph in 5th gear doesn't sound too far off for a stock ride..

Very disappointed in that. 124mph.

She is in getting a few things sorted as you will see from my other thread. There is a serious miss on her - like she takes a while to catch up on herself.

We'll see if its any different when I get her back.

There is no known model of MKIII Supra with a limiter governing the maximum speed... that article was about the MR2 and that does have a known limiter (at least the JDM and USDM do).

me knows its about MR2.

it was just information on restrictors that fitted the situation.

thanks for info cre, me now knows its got feck all to do with a restictor now. so cre does 124 sound right to you?

Thant's fine. I didn't know if you were just assuming at was an across the board thing for Toyotas or something.

Top speed depends on many factors... I've been up to an over 140MPH (all GPS verified, the stock speedo isn't reliable) in a few different MKIIIs with plenty left in each one. I haven't tried it in a stock turbo MKIII myself, but I know many people have claimed higher top speeds than that.

What happens when you reach 124MPH? Just nothing more to give? Fuel cut? What RPM are you reading then? RPM is a wee bit more accurate than RPM if you know your tire size, transmission gearing and differential ratio.

What market was your MKIII originally sold in? You have a 7M-GTE in there, correct? Do you by chance have Traction Control in the vehicle?

theres nothing more to give at 124mph.

7M-GTE engine.

UK spec.

16x7" tyres - 245/50/16.

no traction control.


just that people are surprised when I tell them the top end of my car, just needed to see what everyone else is getting.

Other than it simply being tired from age and needing a lot of TLC I can't think of anything other than environmental limitations. Like I said though, I haven't tried any speed tests in any stock MKIIIs (I highly doubt I'd feel safe enough), so I don't know what's a realistic cap... I'd think a bit more than that, but it's going to depend on a number of factors.

I really do hope you're exercising due caution when during these attempts and have made sure that your tires and brakes are more than up to the task.

ive personally had my mk2 to 140mph
and my mk3 all the way to 153mph
if most vehicles have a electronic restricter than it will probly slow you around 140-160 km/h
EDIT*
oh and my tires and brakes are prime, not to mention my gauges are fuckin perfect never failed...

So your gauges are good, any need for effing n blinding about it???

Rant aside, the op mentioned he's having problems with a misfire ATM so I'm not surprised it's only hitting 120 or so, in fact I'm more surprised he's pushing it flat out knowing full well that something's not right engine-wise...

I think the quoted top speed (how accurate I don't know) for a 7M-GTE Supra when new was 146mph or thereabouts... I wouldn't be putting this to the test though until I was sure the tyres & crappy single pot calipers were in A1 condition, or replaced with something a little more suitable for hauling up a ton and a half of car from that sort of speed!

uh... yea, were men get used to it...

uh, yea but not everyone who reads this forum is. Supra's gotta be pretty popular with kids... Maybe save the foul language for the bar is all I'm saying, you have more words in your vocabulary & you may as well use them.

I'm sorry, but the N/A's mechanical top speed is 142MPH... it doesn't have the gearing to take it past that prior to redline... 89+ have a lower limit as their redline is 250RPM lower still. Your gauge was way off. I have yet to see proof of anyone in a stock N/A breaking 125MPH... that's about the top I could ever get mine too and seems to be the norm for an upgraded N/A with a factory block.

Car and Driver (back when the car was new) tested a unit from Toyota (you may bet your rear that it was thoroughly prepped and extremely healthy) they got the vehicle to 131MPH on a pristine track... fewer bumps and road irregularities to slow them down.

My gauges have been recalibrated, they are not even perfect. Due to the design of the speedometer ambient heat skews the speedometer's readings quickly. The higher the speed the greater the inaccuracy.... there also remains the fact that the tires influence the speedo's readings. A reading of 50MPH while they are cold is not the same as a reading of 50MPH when they are warm... size and tread wear skew things even further.




I found some info indicating that the JDM MKIII did have a speed limiter, the USDM did not and I've sent an email to a friend to see if any other markets did and what the limit was.


EDIT: I'll even admit that the speed I hit in the lower 120's is something I don't even trust... AND it took several miles to get that high AND some of it was downhill.

Ive hit about 148 in an "almost" complete stock 7MGTE, only mods it had was K&N air filter and fitting bracket with a HKS metal head gasket. It was also an A/T US 3.0L version. Was done and checked with a garmin nuvi and some other random GPS. Too bad I was following a 2005 porsche GT2... felt like I was standing still when he took off from me at 140....
OH yeah 1992 MKIII

Ok, I heard back... JDM ECUs appear to be the only ones with a limiter. They are limited to 180km/h (approx 110MPH).

well i just had a HG replaced 3 months ago about, i got exhaust headers, K&N air filter, replaced my ECU main relay, and lots more electrical, and removed my A/C belt im sure im slightly above stock...
and i wouldnt say my gauges were fine if i hadnt tested them..
also i live in a farming comunity with nothing but highway for miles...
but just to reassure myself ill bring a friend and a couple gps's with me on my next test

and 125??
my 2.8 liter 85 went to 140mph easy...

I suppose you missed out on the fact that the N/A MKIII's physical limit, due to gearing, is 142MPH.

But whatever, I'm not going to get into another one of "those" threads... it's been proven time and time again and I've got better things to do.

an 85 2.8L is not a MKIII... apples and oranges here maybe...:weak:

NOW MY CAR IS IN GOOD WORKING ORDER I TESTED HER AGAIN.

126mph @ 4750rph on the motorway. with more to give.

I slowed down becuz it was dark and bad conditions, wait for it..............

An unmarked Garda car pulled me.