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Tomie Poncams & Vct

al_r33

By al_r33,
in Engines & Forced Induction

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al_r33 Rising Star

al_r33

Posted
Posted

Hey people,

Just after some advice about my rb25 & what should be done to achieve the best response and power!

I have the head off the car getting planed etc & have decided to put in a set of Tomei Poncams Duration: IN, EX 256 Lift: IN,EX 8.5mm,

So I was wondering what would be best as I was only going to put a Cam gear on the exhaust side as I wanted to run the VCT with the cams, but I just wanted to know what people are doing are you using an Inlet & Exhaust cam gear & not running VCT or are you running VCT! As I am tyring to find out some of the setting people are using to achieve good power & results

Sorry if doesn’t make sense but I think there enough there to get someone opinion

Cheers

Alan

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tridentt150v Grand Master

tridentt150v

Posted
Posted

Al, I've got an adj. cam pulley on the exhaust side only, had it before I bought the cams. Now that I have got the cams, my pulley is reset to zero degrees. You don't really need the adj. pulley with the cams, they are dialed in OK from tomei. If money is no problem then get one, you may be able to squeeze out an extra kw or two by setting the pulley up +/- 1 or two degrees, but don't be surprised if all you did was blow your $$$$ and the cams are best at zero degrees.

paulr33 Grand Master

paulr33

Posted
Posted

the standard gear is adjustable its just u have to pull it out to adjust it

ive got a custom bolt on thingy on mine to adjust the exhaust side

bass junky made it up, maybe look into that as u wont need to replace it then

r33_racer Grand Master

r33_racer

Posted
Posted
I run those cams in my Rb25. I too have asjustable gears but the cams are set to 0degrees.

I have a HKS 3037s running 1.5 bar 0 is still the best setting.

Ditto...but different turbo and different boost >_<

  • 1 year later...
dangerman4 Mentor

dangerman4

Posted
Posted
the standard gear is adjustable its just u have to pull it out to adjust it

ive got a custom bolt on thingy on mine to adjust the exhaust side

bass junky made it up, maybe look into that as u wont need to replace it then

you talking shit again Paul.

have another try.

you mean the inlet cam gear is adjustable.

everyone says the poncams are best set at zero, but this is with a unopened engine.

if you have decked either your block or head then the distance between teeth on the timing belt will change and therfor your cam gears will need to change to find zero again.

Abo Bob Grand Master

Abo Bob

Posted
Posted
if you have decked either your block or head then the distance between teeth on the timing belt will change.

??

Umm what does decking the head or block have to do with the timing belt?

Edit: I know what you mean but you didn't explain it very well. It's the distance between the crank gear and the cam gears that different. Do you really think it changes enough to warrant adjusting the the cam gears? I suppose so. You would be adjusting them the same amount as each other though, you would need both gears to be adjustable.

dangerman4 Mentor

dangerman4

Posted
Posted

yea sorry i didnt explain myself very well.

i will try again.

assume we are using a genuine nissan timing belt that has the marks on it to line up with the timing gears.

if you remove the standard head gasket and chuck a 2mm head gasket in there it will lift the head higher then standard.

to line the marks up with the standard timing marks on the nissan belt you will have to advance both gears 2 or 3 degrees. this will still show the gears set at zero, but compared to the crank they are not.

on the other hand if you have a full rebuild and they deck both your block and head and you run a stock thicknes haed gasket, you will then have to retard your gears to set them at the standard marks.

it may only be a degree or two but its still out.

  • 1 month later...

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