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Old 29th May 2015, 12:00 PM   #41 (permalink)
Calibrat is having RB32 build with v-cam
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Ive seen cars runing high numbers on a 9180 on various sites
Im all for torque.. Bhp is for kids
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Old 29th May 2015, 12:03 PM   #42 (permalink)
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Quote:
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I already have a flowed AMT head on an RB28.
Makes around 440-450lb'ft from around 3,300rpm.
My car was built for drivability and a wide powerband.

Was just curious what the benefits would be on a car like mine.

So potentially it would spool up a little bit quicker ?

more than happy for you to drive mine to experience the difference
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Old 29th May 2015, 12:12 PM   #43 (permalink)
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more than happy for you to drive mine to experience the difference

It's a diffrent engine matty? Isn't yours on twin top mounts?
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Old 29th May 2015, 12:14 PM   #44 (permalink)
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2.8 TS HKS Step 3 , with various other modifications

its a v cam pro 1/30
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Old 29th May 2015, 12:16 PM   #45 (permalink)
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2.8 TS HKS Step 3 , with various other modifications

its a v cam pro 1/30
What turbos mate? Ported head?
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Old 29th May 2015, 01:07 PM   #46 (permalink)
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I'll let you guys know how much early vcam pro can work up to - got my mapping Tuesday.
I'll be aiming to wring as much as safely possible out the car.
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Old 29th May 2015, 01:11 PM   #47 (permalink)
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Find a modern engine without VVT. The RB26 is prehistoric in that field.
That's not totally fair comparison though, all modern engines have been forced towards VVT so they pass euro regs/get a low CO2 classification.
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Old 29th May 2015, 01:17 PM   #48 (permalink)
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more than happy for you to drive mine to experience the difference
That's very kind.
Maybe when the R34 is here as that is also an RB28 (so we have 3) for comparison purposes.

The V-Cam is something I have often thought about.
Just not sure the benefits justify the cost as I do like my car with it's current set up.
I could get into the trap of just doing it because there isn't much left I need to do...
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Old 29th May 2015, 01:18 PM   #49 (permalink)
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more than happy for you to drive mine to experience the difference
Well someone might as well eh
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Old 29th May 2015, 01:25 PM   #50 (permalink)
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That's not totally fair comparison though, all modern engines have been forced towards VVT so they pass euro regs/get a low CO2 classification.
Valid point. Ultimately its about efficiency though. More power for same fuel means a optimal cam timing.

But to answer the question. I think you could built your own for less than £1000 of you did the desgin yourself and only had to have a few bits made.
You need a camshaft, a slight head mod, an oil feed, 2 sensors and a solenoid plus a good ECU. And of course a cam pulley.
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Old 29th May 2015, 01:32 PM   #51 (permalink)
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V-Cam is well worth the money - in Japan. Once you take exchange rate, import duty and VAT into account, it is absolutely not worth the money in the UK.

Save money and get good head.
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Old 29th May 2015, 02:44 PM   #52 (permalink)
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Valid point. Ultimately its about efficiency though. More power for same fuel means a optimal cam timing.

But to answer the question. I think you could built your own for less than £1000 of you did the desgin yourself and only had to have a few bits made.
You need a camshaft, a slight head mod, an oil feed, 2 sensors and a solenoid plus a good ECU. And of course a cam pulley.
I spoke to a Kiwi firm a few years back who'd do something for a little more than that. That was using RB25 VVT parts.

From memory they wanted me to send them the head to mod.
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Old 29th May 2015, 02:48 PM   #53 (permalink)
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I spoke to a Kiwi firm a few years back who'd do something for a little more than that. That was using RB25 VVT parts.

From memory they wanted me to send them the head to mod.
It is that kind of thing that must be possible.

I remember playing around with it on old SR20's, and it is a very simple setup, if not that reliable.

My main concern is would it fly apart at high rpm....
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Old 29th May 2015, 02:48 PM   #54 (permalink)
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I'll let you guys know how much early vcam pro can work up to - got my mapping Tuesday.
I'll be aiming to wring as much as safely possible out the car.
Got an engine spec or build thread buddy? Should be VGood.
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Old 29th May 2015, 04:04 PM   #55 (permalink)
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Because I have 10mm lift at the moment and they will be coming out for better cams towards end of year
Interesting comment, as I have seen many flow bench results results (non rb) where increasing lift doesn't show any flow gain as the restriction is no longer the valve head but the valve seat/ throat.

Do you have flow data from AMT showing the head actually flows better increasing lift from 10mm to 12mm?
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Old 29th May 2015, 04:21 PM   #56 (permalink)
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Got an engine spec or build thread buddy? Should be VGood.
Main bits:

Hks 2.8
Naprec built drag head (big valves etc)
Vcam Pro
Jun intake fannymold
100mm cast TB
T88-38GK 22cm housing
Trigger kit
Syvecs being mapped on v power, vpower + meth and then q16
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Old 29th May 2015, 04:25 PM   #57 (permalink)
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Quote:
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Interesting comment, as I have seen many flow bench results results (non rb) where increasing lift doesn't show any flow gain as the restriction is no longer the valve head but the valve seat/ throat.

Do you have flow data from AMT showing the head actually flows better increasing lift from 10mm to 12mm?

As you say David it's were the restriction is and on a good ported head it is valve lift, I've often had the conversation with Andy about valve lift and my cams not being big enough to take full advantage of the porting work. Il have a word with andy see if he is kind enough to post some dater

That's why the end of this year my 10mm lift cams are coming out for some custom ones.
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Old 30th May 2015, 01:08 AM   #58 (permalink)
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.....if the HKS setup wasn't drug money, it would be on my motor

Dude, stop buying drugs then........save up for the V-Cam instead.
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Old 30th May 2015, 10:59 AM   #59 (permalink)
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Forgive my ignorance as I haven't seen an RB25Neo head but it was mentioned earlier in the thread that you would be forced to use the neo manifolds.

Again, not having seen the head, it strikes me that rather than buggering about trying to adapt a 26 head to accept the parts, if the only issue is stud orientation then it would seem simpler to make an adapter plate from neo head to RB26 manifold(s).

They shouldn't have to be particularly thick either so packaging shouldn't be an issue ..


However, I'm assuming that there must be more to it than that or someone would have made one up by now ......


TT
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Old 30th May 2015, 11:05 AM   #60 (permalink)
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VCAM - Affordable Replacement

Posted a kit earlier, it's been done.
Can be done in situ apparently too.

25 head can be made to take 26 gear, but it's a PITA especially the intake side, Blitz did a kit years ago for one of these.
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