GTR cam into gtst ???

[West]

GTR cams, i was thinking if we could chuck GTR cam into our rb25det without any major modification and gaining wise??? Anyone done dis b4? Please help !

[dojobi]

I'm thinking of doing this too, as GTR cams are cheap. I don't want to lose my bottom end though, so I'd like to see a before/after dyno comparison so I can see the effects.

[KamikazeR33]

would they match up to the valves? is this correct by anyone who knows what they r talkin bout (not me)

[dojobi]

I don't know what I'm talking about, but I've heard from a few others that they do match up just fine.

[matlowth]

Yep - It can be done - I've got two in my car

matt

[dojobi]

How much of a power gain did you get Matt? Did it affect your bottom end at all?

[matlowth]

It was all done as part of one big package (RB30/T76) so not too sure... Not too sure what sort of benefits it would make by itself, but they are a fair bit bigger than the baby cams that are in there to begin with.

Definitely need to get the cam gears too if you plan on doing this.

matt

[dojobi]

I've got an exhaust cam gear, so I'll pick up an intake gear to go with these cams. I hear that the camshafts are pretty damn cheap as many GTR owners go for the brand name cams. Does anyone know the going rate on them?

[BNCR32]

Hope you guy's know what your do'in,cause to my knowledge the RB26DETT uses solid (shim type) adjusters & the RB25's use hydraulic lash adjusters.If you work it out,I just so happen to have what you're looking for,plus a lot of other GTR bits,so do some research & tell me what they're worth(sensibly) & I might part with them.

[dojobi]

I've looked into this a little and it appears that you can put solid adjusters into a GTS25t, but you can't put the hydraulics into a GTR. I'm not too sure what they're worth yet, but I'll check with the Toy Shop. They've got absolutely every part known to man and if they don't have it they can price it for you and then get it.

[Jay95R33]

How do you think it'd go if you got a GTR cam and adj cam gear for the exhuast side, and keep the factory inlet cam so you can keep the VCT in the inlet side of things?

Would it work OK or would it be too much of a mismatch in inlet/outlet cams???

J

[dojobi]

Hmm, that's not a bad idea Jay. I'll ask my mechanic when I see him next. Have we got any specs on the GTS and GTR cams so we can compare?

[meggala]

I dont think you can keep the vct with the gtr cams from what I have heard the stock gtr cams are similar to the gtst cam BUT they are fully adjustable ie cam gears on both sides and more durable being soild lsfter type

meggala

[ph1]

i sold mine for $250/pair, that seems to be the going rate these days.

also sold my std lifters/springs/retainers for a similar price to that, but can't recall the exact price right now

[dojobi]

Cool, thanks ph1.

Do you know what parts I would need to put them in? ie will I need the GTR springs, lifters and retainers? Or can I use some of my GTS stuff?

[matlowth]

My car has GTR valve springs, and a little bit of a head tidy up, but that's about the only mods that were done to the head. The VCT has been disabled in my motor fyi.

Cheers,

matt

[DAMQIK GTS-T]

I have a set of n/a rb25de cam's would they be worth putting in my rb25det motor as a performance upgrade? I am assuming that the n/a cams are a lumper duration than the turbo cams.

Thanks

Damqik

[Sydneykid]

Hi guys, the standard GTR inlet camshafts don't have the drive for the VVT, so you can't use it. From memory the GTR inlet cam is hardly any different in timing or lift to the RB25DET. You may get a little bit out of the exhaust camshaft with an adjustable pulley. Maybe 5 to 8 rwkw, but most of that will come from the pulley.

I don't really think it is worth the effort.

Series 1 RB25DE cams are quite a bit more agressive in both timing and lift, I reckon they would be a better bet than GTR ones. Plus you can use the hydraulic buckets. But you still have the VVT problem, as the N/A engines don't have VVT.

We used these cams in the RB30ET/RB25DE hybrid for 475 bhp on the engine dyno in our old GTR, so they are certainly OK at that level.

Hope that helps.

I'll be interested in the results.

[dojobi]

Hi SydneyKid,

I had a look at the image that Meggala posted ages ago and got these specs for the cams:

RB25DET

IN EX

240 240

7.8 7.8

120 117

RB26DETT (R32, R33)

IN EX

240 236

8.58 8.58

113 125

Do you know the actual specs of the RB25DE cams? It would be good to use hydraulic ones.

I thought the GTR cams would be good as they are close to the RB25DET cams, but with higher lift. For $250 I thought it was a bargain.

[Jay95R33]

SydneyKid - I was hoping that you'd reply here

Can you see any problems using only the RB25DE exhaust cam (with adj pulley) in the RB25DET and keep the original cam so you can keep the VCT??

Or would you rather use just a adj cam pulley on the stock RB25DET exhaust cam and not bother using the RB25DE cam at all - just talking about mild mods, nothing serious

Cheers

Jayson