Aftermarket Cams

[Kdawgboostin33]

Hey guys,

I was looking at placing some aftermarket cams onto my RB25 and was just wondering the advantages and disadvantges of doing such a mod. And would HKS Cams be the way to go?

Fanx

[5 litre eater]

I'd be interested to know aswell. I've got an rb20det, and i've heard that putting rb20de cams in will be a good upgrade. I'm not sure why tho...

But getting back to the topic, from what i just asked, would rb25de cams be an upgrade for a turbo'd 33, and if so, why?

Matt.

[lukevl]

Non turbo cams have more duration and overlap, which gives more performance than the standard turbo cams.

We do ALL TYPES of camshafts, from 1930s staem engine cams to 2 meter long Diesels to even RB25.

I have a set of RB25 cams waiting to be bolted to my cylinder head.

We have the best quality camshafts in Australia.

Luke

Ivan Tighe Engineering

[Kdawgboostin33]

Yeah, K? But what sort of advantages are there to gain from this Mod. Not who does em

[lukevl]

Listen, if you tell us what power you want from your engine and at what RPM you want to do it, we can make cams to do it. MAX HP GTR, Street GTR, drag GTS, ANYTHING. (As long as your power claims don't exceed your bolt ons)

As for DE cams in DET, havent' done it. Bit of a baind-aid approach.

[Steve]

As Lukevl pointed out, cams will be different depending on what you want - mid range, top end, a bit of both.... If you can imagine, by going for top end, you will loose some bottom end, etc etc. Also, it may have a negative effect on emissions.

Cams can be tuned to allow the cylinders to fill and empty easier, therefore increase power, but duration and overlap will vary depending on where you want to make the power.

So if you get the wrong cams, your car will run like a dog.

Out of interest what other mods do you have? Doing cams CAN be a good idea, but definately shouldnt be the first mod on the list:)

[Steve]

lukevl,

what lift and duration do you recommend for a street/track gtst aiming for mid and top end increase without too much loss of bottom end driveability. Inlet and exhaust. Do you recommend adj cam gears inlet and exhaust or exhuast only? I am looking at keeping red line probably under 7500rpm.

Cheers

[Kdawgboostin33]

Thanx Steve,

Mods I have is FMIC - Custom Plenum - 3 inch Exhaust from Turbo - E6K Haltech Aftermarket Computer - Blitz BOV

[Steve]

I would be looking at perhaps an adj exhaust cam wheel, then save for a turbo:)

Probbably better bang for your buck that way. Cams would be an improvement, but not nearly as dramatic as with a bigger/better turbo.

[Kdawgboostin33]

Cool Thanks, What sort of gains are we lookin at with the Adj Exhaust Cam Wheel?

[Busky2k]

If your gonna consider putting a larger set of cams in, you might aswell get some headwork done to also compliment them. Btw I thought increase overlap wasnt beneficial in forced induction engines?

[lukevl]

Head work? HEll yeah! I had to relieve my cylinder head cause the cams fouled the casting with the new lift.

Normally increase the duration by about 15-20 degrees or so at 6 thou, and wack on a bit of extra lift in the order of some 100 thou plus.

Work great for the application you described.

[Steve]

Kdawgboostin33

I havent done it myself yet (coming shortly) but I am hoping for in the range of 10-15rwkw +.

Perhaps someone like sydneykid or rev210 would be better qualified to answer this one?

[lowlux]

hey luke i dont spose yourve got any rb20 billets up there? cause i dont have any at my work

[Kdawgboostin33]

Thanks Steve will look into it a little further, Probably will be happy for a while when I get my car back boosted up to 13-14 Psi today.

[Guest INASNT]

Originally posted by lukevl

Non turbo cams have more duration and overlap, which gives more performance than the standard turbo cams.

We do ALL TYPES of camshafts, from 1930s staem engine cams to 2 meter long Diesels to even RB25.  

I have a set of RB25 cams waiting to be bolted to my cylinder head.

We have the best quality camshafts in Australia.

Luke

Ivan Tighe Engineering

thats a bolt statement!!!! Wonder what crow and crane have to say about that

Anyway how much could u bang together some 260 durations cams for a rb25 for??

[rev210]

Originally posted by lukevl

Listen, if you tell us what power you want from your engine and at what RPM you want to do it, we can make cams to do it. MAX HP GTR, Street GTR, drag GTS, ANYTHING. (As long as your power claims don't exceed your bolt ons)

As for DE cams in DET, havent' done it. Bit of a baind-aid approach.

What sort of dollars are you looking at per cam? Are they made from new blank billets or regrinds?

I think the only DE cam worth a quick swap into a DET is the exhaust cam, that one alone would do and since there is more hassle with the VVT intake cam I'd consider it.

BTW can you do anything about a cam to suit the existing VVT?

[lukevl]

INASNT - We can do any camshaft. We are the only camshaft manufacturers in Australia. Our facilities are the most impressive in Australia (Cause they're new and neat). And from a true engineering point of view - Yes ours are the best quality. TRUE ground finish, with an ultra-light series of cams on the market too. I have a bachelor of Mechanical Engineering and the boss (Dean Tighe) has an A.D. in Mechanical Engineering. Ivan Tighe makes valves now and co-designed the Repco/Brabham F1 V8, AND he still races his BDA powered open wheeled Kadicha Hill Climb race car. The thing is nuts - and he's 73!!

Crane Cams is American. Sorry about the blurb.

OK READY? In a bucket actuation such as the RB series motors, the camshafts need to be made from Iron. Problem is, you can't make Iron billet camshafts in the RBs length and diameter (Too slender- hard to machine) The way around this is we can make billets from our steel, then the buckets would need to be chrome plated and journals and lobes would need oil holes drilled. JEEBUS they look good but. Doing some 7MGTEs for Toyota in Canada, same style of cam and they look sweeeet.

Cost - Not sure call Dean

Or we can do what we do to almost every other set of RB cams (including mine) and build them up then grind them down, which does not require lash caps or spacing as the base circle is kept intact. Cost for this is $1200. Now don't go nuts cause there is HEAPS involved. If you saw how long it takes to set up, then grind, then build up, then grind and repeat and crack test and straighten, you'd shit yourself.

Call anyway and ask. (07) 3271 6001

[lukevl]

REV210 - I make Adj. Cam gears to delete the VVT if you're interested.

Otherwise, yes we do cams for RBs with VVT. Just a different profile and lobe centres to suit.

[lowlux]

hey luke how ya goin, i actually work for crow