Vibration in 4th gear under heavy acceleration after tune

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Vibration in 4th gear under heavy acceleration after tune

Postby Bluesr5 on Mon, 03 May 2021 6:19 +0000

Hello

I recently had an ecu remap on a dyno which has been great. I have a 2013 Hilux and have noticed if I am in 4th gear and put the foot down with more pressure I get a vibration through the driveline. I did take it back to the tuner and they said it is due to the extra torque and diesels need to be revved out more. I have adjusted my driving style but I am wondering if anyone has experienced similar? It doesnt happen in the first 3 gears.
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Re: Vibration in 4th gear under heavy acceleration after tun

Postby davo94 on Mon, 03 May 2021 6:59 +0000

Is it more noticeable at low RPM? Does it get better or worse as the Rpm increase?
Another 2013 sr5 owner..
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Re: Vibration in 4th gear under heavy acceleration after tun

Postby Bluesr5 on Mon, 03 May 2021 7:23 +0000

Yes more noticeable at low rpm. When I change into 4th and slowly accelerate it is fine but if more pressure is placed on the pedal, that is when it happens. It is a similar feeling if you arent doing enough speed in the right gear i.e 55kph in 4th then trying to accelerate and you need to drop down a gear to get the right rpm to move forward. Not sure if that makes sense
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Re: Vibration in 4th gear under heavy acceleration after tun

Postby davo94 on Mon, 03 May 2021 8:37 +0000

I think you will find that's quite normal behavior or a tuned 1kd. I assume the problem is below 2200RPM and goes away after that.
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Re: Vibration in 4th gear under heavy acceleration after tun

Postby Bluesr5 on Tue, 04 May 2021 6:43 +0000

Yes it seems to be more profound in lower revs. Appreciate your responses davo94
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Re: Vibration in 4th gear under heavy acceleration after tun

Postby Gipsy on Wed, 05 May 2021 5:12 +0000

Diesels don't like heavy throttle at low revs, tuned or not. Although diesels normally have torque at lower revs, they don't like to lug under throttle. Excessive throttle at low revs just overfuels the engine and bogs it down. At low revs the turbo doesn't spin enough to give enough boost to match the fuel going in.
Cheers Gipsy :D
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's
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Re: Vibration in 4th gear under heavy acceleration after tun

Postby Bluesr5 on Fri, 07 May 2021 3:27 +0000

Thanks for the detailed explanation. All of that makes sense
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