New Supra at full throttle refused to change up a gear at high speed.

I picked up my new Supra this weekend and am loving it withonly one or two minor points I want to addresss, but:

Today I took one of my mangers out for a spin at lunch time as he's a bit of a car nut. I floored it and at a 'high speed' the engine was around 7000rpm and refused to change up until i lifted. It did it again a bit later. Back at work I guessed that maybe the Japanese speed limiter was still in place but with the Blitz boost controller etc I'd have thought this would of been removed.

Then on the way home tonight I floored it again it hit around 7000rpm and just wouldn't change up but at a lower speed than before and was like it was bouncing off a limiter.

I cruised the rest of the way home and have noticed that the peak boost recorded by the blitz is 1.24 bar and the defi gauge peak says 1.44

I've spoken to the previous owner and he says that this happened in the past and that is was suggested as a cheap and nasty speed converter. Does this sound right rather than just a case of it over boosting and the blitz boost controller needing adjusting?

I've had a quick scan of the instructions for the for the blitz but am none the wiser at the moment as I didn't have one in my last Supra so it's all new to me.

If it is a poor speed converter what do you guys recommend

I take it you were foot flat to the floor over 100? you'll have the kick down switch engaged and iirc that disables the overdrive, which leaves you with only 3 gears.

I take it you were foot flat to the floor over 100? you'll have the kick down switch engaged and iirc that disables the overdrive, which leaves you with only 3 gears.

how would you get around this

I'm not saying I'm 100% right mate... But I do remember something about that.

Is Overdrive off?

Overdrive wasn't off. I thought that even in kiockdown the car would still change up when it hit the rev limit rather than just sitting on the rev limiter.

I was doing over a 100 two of the times but the third time i was doing about 30mph less and it did it again, so that would be one gear lower.

When it did it at the higher speed I thoguht it was that maybe the Japanese rev limiter was still in place but when it did it later on the journey home at 30mph lower speed I know that's not the case.

I have a blitz SDC i-d boost controller and when i looked at peak boost it had hit 1.24bar which is a bit high I'd have thought.

Also, speaking to the previous owner he said that it had done it before a long time ago and people suggested this was due to a poor quality speed converter, does this sound feasable?

I take it you were foot flat to the floor over 100? you'll have the kick down switch engaged and iirc that disables the overdrive, which leaves you with only 3 gears.

Surely with an auto car you should be able to stomp on throttle off the line and accellerate flat out all the way to the top speed in theory. No point locking out top gear and bouncing off the rev limiter and also the car would post an awful time on a drag strip if this was the case.

1.24 boost is just fine as long as there is no cats,

with over drive off you will not go into 4th it changes into 4th at around 125mph with it on

if you are in manual mode and select a gear you wont change from that gear you will just bonce off the limiter

this is how my car behaves i have read on here that it should change gear in manual mode if damage is going to be caused to the box or engine but unsure how that is specified.

if you car does stay in gear and doent like to change when its in D and over drive enabled(no lights up on the dash) and not in manual mode (again make sure no lights are lit on the dash), then i have heard of this problem with the transmission fulid loosing its fiscosity, easy fix just change the transmission fluid.

Is it a VVTi Tiptronic? They can be a total PITA with gizmos added for top speed delimitation.

It's a 95 RZ-S auto. So not tiptronic. It wasn't in manual mode and overdrive wasn't turned off. The transmission fluid was changed by the previous owner and the garage that did it gave the gearbox a clean bill of health too. Definitely nothing to do with a poor speed converter as previouisly suggested?

On my auto it does change into 4th with overdrive off ( im 90% sure)

Sounds like a strange problem, the limiter on a j-spec is 112mph. And end of second is 90mph and the end of 3rd 135mph so its a strange problem to have

Is the fluid level in the gearbox correct? I have seen even garages fail to check the level the correct way.

Just done a quick check and levels seem fine.

On my auto it does change into 4th with overdrive off ( im 90% sure)

 

Sounds like a strange problem, the limiter on a j-spec is 112mph. And end of second is 90mph and the end of 3rd 135mph so its a strange problem to have

I'm pretty sure it was bouncing off the limiter at both those speeds with my foot planted and it only changed up when I lifted. It's almost like the gearbox didn't know it was at the redline and time to change up.

The engine "load" signal to the ecu is electronic via the ecu, You can get the gearbox service manual from Toyota and it gives the correct voltages at the gearbox connector for various conditions. It could be checked by a GOOD garage or a PROPER auto box specialist. If it has ANY none stock "gizmos" wired up to the ecu or odometer / speedometer remove them and put the car back to factory stock, electrically, and go from there.

It has a Blitz SBD i-d boost controller and power metre (tho power meter not fully wired up and working) and a defi gauge. I'm not really fancying the idea of tracing the cables for this little lot and removing bits.

Just done a quick check and levels seem fine.

Without being insulting you are checking the level with the engine running?

No I checked the level with the engine off, does it need to be running to check transmission fluid level? My knowledge about auto gearboxes is pretty poor.

Without being insulting you are checking the level with the engine running?

Well I never knew that. Need to check mine now.

Does the car need to be warm or just running?

Yup, engine running, go through all the gears and back to N, car on a level surface and check the level. Doesn't matter hot or cold Havard, the dip stick has graduations for both

I see far more auto box problems caused by wrong oil level than mechanical malfunctions, even a lot of garages are clueless as to how they should be checked. There should be a flag on the dipsticks referring to the manual.

You learn something new everyday. Just gotten home from work so will chill for a bit and have look at gearbox fluid level.

I am pretty sure tho that my problem is with the speed converter. Chatting to the manager from work that I had in the car when I noticed the issue and we both agree that we were stuck at 120 on the speedo but not at the redline so taking into account the speedo being out a bit I reckon it was the 112 limiter. Tho I'm not sure if this is related to why the gearbox wouldn't change up at 90 when it was bouncing off the revlimiter. I plan on getting a Thor speed converter later in the week and taking it from there.

probably is a cheap speedo converter,i had this on mine.

does it doing in 1st gear,rather than change up to 2nd?but is ok on part throttle!