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The mkiv Supra Owners Club

Hitting rev limit @ 5k?


bodilx6
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Mine does this as well.

Normally in 1st if you really give it beans.

 

I think it might be hitting the top limiter, but the needle just can't keep up.

I reckon you could find out if you managed to make it hit the limiter and then kept your foot planted to give the needle a chance to catch up... but I think I'll let you try that one first. :D

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No apparent overfuelling. I havent checked my wideband in 1st @ WOT though, but its normal and even maybe a tad on the lean side in higher gears.

 

*Could* be wheel spin, but then shouldn't rev counter still follow? (unless it really is slow)

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Have you got a boost gauge? What boost are you running?

 

Could it be that you massivly over boosting? Is there some kind of second cut. Or could it be the fact that your actually running out of fuel????

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Or could it be the fact that your actually running out of fuel????

 

I initially thought this, it cant be overfuelling thats for sure, faulty fcd or running out of fuel is what I'd say

 

Does the stock ecu compensate for lean conditions by introducing fuel cut - I dont think so, but it may do if your injector duty cycles are ludicrously high - which will be the result of overboosting

 

As wez mentioned you dont sound as if you have a UK car and no mention of a restrictor ring so this may be the case

 

Do you have a boost gauge?

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Guest DrifterWanaB

iam still a bit wet behind the ears with the supra,

 

but are you running coil packs, if there breaking down it feels like a rev limiter, but usually it will pull through the misfire

 

Just a idea

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iam still a bit wet behind the ears with the supra,

 

but are you running coil packs, if there breaking down it feels like a rev limiter, but usually it will pull through the misfire

 

Just a idea

 

Sounds a likely cause, or plugs breaking down under load. When did it have new plugs? What are they?

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Sounds a likely cause, or plugs breaking down under load. When did it have new plugs? What are they?

 

I was just about to ask that - what are you actually feeling - fuel cut is head through the windscreen material

Rev limit is pretty much a noise and a slight loss in power, spirralling the more you hit it

 

Is it consistant this rev limit and have you got more than a quarter of fuel in the car?

 

Do you have the stock ecu and only the stock ecu?

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Maybe mine's not like this...

For starters mine only happens in first and is joined by a big braaaaapp and it only happens if the wheels are spinning.

I'm sure it's the limiter, but it's very difficult to look at the rev counter and the road at the same time.

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Maybe mine's not like this...

For starters mine only happens in first and is joined by a big braaaaapp and it only happens if the wheels are spinning.

I'm sure it's the limiter, but it's very difficult to look at the rev counter and the road at the same time.

 

Don't floor it when your doing it, let the engine rev up slowly to the limit, not slowly so that you have it at 5k revs for 10 seconds or anything, just so that you can keep an eye on it and the road.

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Have you got a boost gauge? What boost are you running?

 

Could it be that you massivly over boosting? Is there some kind of second cut. Or could it be the fact that your actually running out of fuel????

 

Running around normal BPU boost. 0,8 or so in 1st as max i think.

No massive overboost at least

 

Wideband is also around normal, as mentioned. Only a bit lean in high gears. 13 or so in 1st i would say

 

iam still a bit wet behind the ears with the supra,

 

but are you running coil packs, if there breaking down it feels like a rev limiter, but usually it will pull through the misfire

 

Sounds a likely cause, or plugs breaking down under load. When did it have new plugs? What are they?

 

Everything about the coils are stock. Actually just puchased new coils plugs since the old ones are getting a bit brittle.

 

I have the platinum toyota plugs, gapped to 0,7mm. should be ok. When I first got these plugs it definately misfired since they were gapped like standard plugs. It didn't misfire untill 2nd or 3rd gear anyway. And its definately not the same here. If it should be the plugs, wouldnt it also happen in 2nd and higher?

It only happens in 1st and not the same "cut" if you can say so. Misfire is more of a, yeah, fireing sound repeated much faster than this

 

My car was 100% stock J-Spec before i got teh 3" exhaust, 2nd decat and kept the 1st cat with a hole punched through to add the resistance of a restrictor ring.

Edited by bodilx6 (see edit history)
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I was just about to ask that - what are you actually feeling - fuel cut is head through the windscreen material

Rev limit is pretty much a noise and a slight loss in power, spirralling the more you hit it

 

Is it consistant this rev limit and have you got more than a quarter of fuel in the car?

 

Do you have the stock ecu and only the stock ecu?

 

Not like fuel cut. Had that one before I got the FCD. More like you describe the rev limit. Should be with more that a quater of fuel, but I'll check as soon as I refill.

 

Stock ecu and only that one.

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