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Disconnect this sensor and gain POWER!

turbomad

By turbomad,
in Engines & Forced Induction

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turbomad Community Regular

turbomad

Posted
Posted

A mate took his R33 to Dyson Rotary to have a power run done on the Dyno, everything is stock except the exhaust and an EBC(11psi), as you can imagine the power curve was up and down all over the place, for the next run they disconnected a sensor and did another run and suddenly the power curve was alot better and a good 10kw above the previous one everywhere! When he asked what that sensor was all he said was "it's a trade secret". The sensor he unplugged was the one above and to the right of the temp sensor, that goes into the head. Does anyone know what this sensor does and is it safe to drive around with it unplugged?

BHDave Grand Master

BHDave

Posted
Posted

No idea what the sensor is but it'd be intersting to see if it'll start and drive when cold, also whether the car pings like a bitch when the temperature gets high. On the dyno you atleast have the confidence that they are monitoring for ping.

Jay95R33 Grand Master

Jay95R33

Posted
Posted

I just had a quick look under the hood.

On the radiator hose mount there are two plugs (sensors), is it one of these? Or is it the plug that is righ next to the radiator hose housing that connects to a big (3 inches long) hexaginal nut thing that bolts into the head ?

J

BHDave Grand Master

BHDave

Posted
Posted
sounds like the wire from the variable valve timing

Now that makes sense. I have a mate who has done an s14 sr conversion into an s13 running s13 computer.

He installed a switch to control the vvt and it makes a massive difference. When he was tuning the car on the dyno there was an easy 20kw difference in the midrange but it tapered off at the top end. There was a definate difference at the top end when it was on/off though i cant remember the figure.

turbomad Community Regular

turbomad

Posted
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JAY95R33 that's it, the 3 inch long hex shape thing that goes into the head. I'm not sure if it controls the VVT as I thought that was the one on the end of the camshaft but maybe it's all related as BHDave said by switching it on and off it made a difference on the dyno, ask your mate whether he attached the switch to this or not? It's definately not the knock sensor because I believe that is on the block not the head.

Cecam Enthusiast

Cecam

Posted
Posted

I have a friend who unplugged his VCT while on the dyno, I think the results were less lower end torque and higher top end. I can't find the scan of the printout, but they're quite a different power/torque curves.... As the VCT turns off at 5500rpm not sure why it would make more top end power thou. Perhaps revs more freely not sure. I've unplugged mine before and it was smoother the lower torque at low revs was fairly noticable.

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