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Tomei 270 By 10.25 Lift

Daz

By Daz,
in Engines & Forced Induction

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Gerg_R31 Mentor

Gerg_R31

Posted
Posted

You will need to machine the head it above the litter bores

and yes you will need to get springs to suit (i got some if your interested, $180, they suit 10.5 lift not the 10.8 im running)

You will also most likely need to reset the valve clearances

mico Proficient

mico

Posted
Posted

You'll need springs, and an engine that is capable of making power above 9000rpm.

Do you have a need for cams that big?

serious ? are 270 that bad ? im pretty sure ive seen a few gt35 setups with hi lift 270's limited to 8k. ive also been in a t04z powered rb26 with 10.5 270's and was limited to 8.5k. made over 600hp at all 4's.

Rolls Grand Master

Rolls

Posted
Posted

serious ? are 270 that bad ? im pretty sure ive seen a few gt35 setups with hi lift 270's limited to 8k. ive also been in a t04z powered rb26 with 10.5 270's and was limited to 8.5k. made over 600hp at all 4's.

The whole point is why are you getting 270s if you don't want to rev your car to 10k rpm. Are you just buying them because "cams are cool" and you have no idea why you even need them?

Don't buy parts for shits and giggles, figure out your goal and buy the appropriate parts to reach that goal. It is like going to uni and doing a degree then figuring out what kind of job you want, you have it all backwards!

The Mafia Grand Master

The Mafia

Posted
Posted

serious ? are 270 that bad ? im pretty sure ive seen a few gt35 setups with hi lift 270's limited to 8k. ive also been in a t04z powered rb26 with 10.5 270's and was limited to 8.5k. made over 600hp at all 4's.

Sure am. What power they make has nothing to do with it. They could have been lag monsters with no torque mid and low.

You need to pick the cams that give you the fattest torque curve between where the turbo starts to come on hard, and your rev limiter. Well chosen Smaller cams will make it spool earlier too.

Bigger isn't always better.

The Mafia Grand Master

The Mafia

Posted
Posted

Haha mate, we probably saved you a couple of thousand too.

At least someone on this forum listens to the advice given.

I've seen things as dumb as a gt3076 with a 0.63 rear housing, and then 270 cams fitted, and the owner telling me that I'm stupid and biggest cams are best...

In that situation, standards would have been better than 270s...

Anyway, glad to help.

Rolls Grand Master

Rolls

Posted
Posted

Sure am. What power they make has nothing to do with it. They could have been lag monsters with no torque mid and low.

You need to pick the cams that give you the fattest torque curve between where the turbo starts to come on hard, and your rev limiter. Well chosen Smaller cams will make it spool earlier too.

Bigger isn't always better.

That is the worst combination I've ever heard, a turbo that doesn't flow well up top already coupled with cams that have extra overlap and need even more flow....

WHY

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Haha mate, we probably saved you a couple of thousand too.

At least someone on this forum listens to the advice given.

I've seen things as dumb as a gt3076 with a 0.63 rear housing, and then 270 cams fitted, and the owner telling me that I'm stupid and biggest cams are best...

In that situation, standards would have been better than 270s...

Anyway, glad to help.

Put 280s in - they will give you 500rpm more response according to some people!

The Mafia Grand Master

The Mafia

Posted
Posted

That is the worst combination I've ever heard, a turbo that doesn't flow well up top already coupled with cams that have extra overlap and need even more flow....

WHY

I feel your pain.. They seriously think its so much better.

Someone else I know put a set of 270s in a stock sr20 for a "tough idle"...

No tuner has been able to get it running right... Now he wants to sell the car...

Yeap, bigger is always better according to some of these uneducated fools..

Gerg_R31 Mentor

Gerg_R31

Posted
Posted

You won't need new buckets, if its not broke don't fix it (I've used plenty of camtech/kelford tomei hks etc and ive never had any issue, i never replaced mine and i got the 10.8 lift)

yeah base circles position/thickness does change but the shape doesn't, due to the position changing you will need to at least check clearances, (in the older days the shape would vary and the lifters were machined to suit each lobes shape)

as mafia said, pick the cams based on their rev range i.e 2000rpm-6500rpm, this example means it will be a pig below 2000rpm

plus best to chose parts to suit the cars purpose and rev range it will mostly use, i.e 11.5mm 290° rated 4500rpm plus is probably only best for drag racing not daily driving as it won't make power until 4500

(my n/a 26/30 run 10.8mm 252°/262° @ 0.050" and that is a pig to drive but then the cams start to work between 2200 and 8200rpm :D they were rated 3000+ on a rb26 bottom end)

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