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Tomei Cams... Degreed To What?

Draconis

By Draconis,
in Forced Induction Performance

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Draconis Enthusiast

Draconis

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Okay, I have a set of Tomei Poncams... 256, 8.5mm for my rb20det. Here's the thing... a big part of the reason it is running crappy is because they were not degreed right. I am getting a set of adjustable cam gears since what I was told is incorrect. I have already read through some threads discussing this. They say basically, when using the poncams, just use stock settings or adjust it to the turbo? Is this correct?

I am having issues in trying to figure out where to start adjusting.... what are some degrees that many of you guys found to help?

Here are some specs from my setup... like usual:

Plazmaman intake plenum, FMIC, HKS SSQV, Z32 maf, T3 turbo, top mount exhaust mani, Tomei cams (above), Splitfire coilpacks, Greddy Type S boost controller, Apexi Neo until my Greddy Emanage Ult. with Map sensor.

So anyway... any averages or ideas of what I should advance/retard my timing at?

Thanks.

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Draconis Enthusiast

Draconis

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Okay... I pulled up the Tomei catalog like someone had mentioned in a previous thread and here is what I read from it:

Type: Lash (I assume this is the stock hydraulic lifter type?)

Duration: 256

Lift: 8.5mm

Valve lift: 8.5mm

Valve clearence when cold: n/a or -

Adjust pulley initial value: 115

Lobe center angle: 32... with a symbol in front

So, I assume what I'm looking for is the adjust pulley intial value and the lobe center angle?

No one up here plays with rb20s and they think it cannot achieve the power you guys have proven... so finding a tech who knows what to do is slim to none. But if I can find the information that he can use as a base and extrapolate from, then we are in business... otherwise it's just a waste of time testing lots of crap and I really dont have that much money for just about endless tuning.

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GTR1993 Mentor

GTR1993

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115 will mean lobe centre, i have degreed my RB26 cams in before my self and made massive gains

My understanding:

If your lobe centres want to be at 115 deg then: A lobe center of 115 on the inlet cam means that maximum valve opening will be at 115º ATDC and 115 on the exhaust will mean that maximum valve lift will be at 115º BTDC

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