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-5's Vs Rs's On A Larger Then Stock Motor

Piggaz

By Piggaz,
in Engines & Forced Induction

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HYPED6
HYPED6

Here is my little story. I have been wondering the same thing the last 6 months or so. This is what I have found. I bought my gtr with plain bearing -5's. Now with Cams, 10.25 @ 292 Good after mar

JAGR33
JAGR33

Did you put your car on a 4wd dyno? That usually shows a lower figure than in 2wd mode. I can understand your frustration but let me tell you this, don't take dyno figures as gospel, they are a tunin

R31Nismoid
R31Nismoid

Nothing I haven't told him on 3 occasions now since Aug 2010, even earlier it think. So basically what you are telling us is that 6 months down the track. You haven't taken it to the track yet? O

Posted Images

GTRNUR Grand Master

GTRNUR

Posted
Posted

6af5e5eb.jpg

Is that a raised deck OS30 or hi-deck rb28, or an RB30 ? The cam covers look suspisious close to the strut tower brace.

The comment made about RB29's Vcam setup in that thead seemed to indicate a custom v-cam system, not a hks kit? Having never seen it though I can only go on what other misinformation is out there...

Like the rumor that Paul of Red-R racing is developing a vcam style arrangement...

JAGR33 Grand Master

JAGR33

Posted
Posted

The comment made about RB29's Vcam setup in that thead seemed to indicate a custom v-cam system, not a hks kit? Having never seen it though I can only go on what other misinformation is out there...

Correct, it was not the HKS version.

Piggaz Grand Master

Piggaz

Posted
  • Author
Posted

Dont HKS have 3 different cam profiles? Which one would be the ideal one for a -5 setup?

Matt has the smallest version.... But then HKS recommend for a RS/TO4Z setup the biggest duration and lift setup in the V-Cam they half....

elrodeo666 Mentor

elrodeo666

Posted
Posted

Is that a raised deck OS30 or hi-deck rb28, or an RB30 ? The cam covers look suspisious close to the strut tower brace.

The comment made about RB29's Vcam setup in that thead seemed to indicate a custom v-cam system, not a hks kit? Having never seen it though I can only go on what other misinformation is out there...

Like the rumor that Paul of Red-R racing is developing a vcam style arrangement...

Nope its a HKS 2.8.

Probably just the angle of the photo I took.

I know the owner of the car in Japan and he has mint 32,33,this 34 and another and a 35.

Too much coin !!

rockabilly Rising Star

rockabilly

Posted
Posted

well....i am at the moment removing my rear housing from my gt4094r and sending it to the states to have a different type of quick spool valve machined into it. check the quick spool valve thread on here for pics..ifi dont like that then will sell and deffo fit twin 2860,s ....

Marko R1 Grand Master

Marko R1

Posted
Posted

Ill go from the start

Nismo AFM's

ARC Duel entry 105 mm cooler

Nismo plenum

Ported factory manifolds

GT RS's

HKS split dumps

HKS Front pipes (twin 70 mm into 85 mm)

3.5 'cat'

Kakimoto Full mega N1 catback.

hey paul - i finally read your thread & there is a lot information & opinions in here...

my setup is similar although i have:

stock intake plenum

-10 turbos (apparently dont makes as much as power as hks items lol)

xforce dumps

hks super drager exhaust (steps from 3.25", 3.5" then 3.75" at the rear diff)

z32 afms

100mm hks exhaust

ported exhaust manifolds

3ltr bottom end (wont necessarily give you more peak power, torque yes)

...the only thing i could pick which ive raised with you in the past & DOES make a massive difference: is your head ported? this will give you up to 50awkw gain when you are playing in the 400kw range (as confirmed by worksops i use)

i personally wouldn't go changing dumps & exhaust as mine is similar & makes 405awkw (450rwkw) @ 23psi. you want more midrange so yes go with -5s BUT before u do that, pick the brain of that other dyno tuner that i suggested (name disclosed as im not here to sledge workshops).

going to smaller cams - no way! ive had this discussion with crd, red r racing & rips racing many times - unless these workshops dont know what they're talking about & smoke bongs, leave your cams in there (im running 280's @ 10.5mm lift)

work with what you have otherwise your gtr will is going to send you broke (like the most of us lol)

go forth :)

Piggaz Grand Master

Piggaz

Posted
  • Author
Posted

hey paul - i finally read your thread & there is a lot information & opinions in here...

my setup is similar although i have:

stock intake plenum

-10 turbos (apparently dont makes as much as power as hks items lol)

xforce dumps

hks super drager exhaust (steps from 3.25", 3.5" then 3.75" at the rear diff)

z32 afms

100mm hks exhaust

ported exhaust manifolds

3ltr bottom end (wont necessarily give you more peak power, torque yes)

...the only thing i could pick which ive raised with you in the past & DOES make a massive difference: is your head ported? this will give you up to 50awkw gain when you are playing in the 400kw range (as confirmed by worksops i use)

i personally wouldn't go changing dumps & exhaust as mine is similar & makes 405awkw (450rwkw) @ 23psi. you want more midrange so yes go with -5s BUT before u do that, pick the brain of that other dyno tuner that i suggested (name disclosed as im not here to sledge workshops).

going to smaller cams - no way! ive had this discussion with crd, red r racing & rips racing many times - unless these workshops dont know what they're talking about & smoke bongs, leave your cams in there (im running 280's @ 10.5mm lift)

work with what you have otherwise your gtr will is going to send you broke (like the most of us lol)

go forth :)

Marko,

Head is ported.... how good of a job is anyones guess. Does it match the turbo's and cams? I have NFI

Cams as Ash has said a very touchy subject.

Tangomatt used baby cams (Ok he had vcam but meh)

Marcus used 264's @ 9.7 and got a mega result

I am using 270's @ 10.25 and it comes on later and makes less grunt.

Gav is using 272's (i think)

Ah we could go back and forth about this.

BoostdR Mentor

BoostdR

Posted
Posted (edited)

I also use 264 9.7

15psi @4000rpm made 489rwkw on E85 @ 1.8bar GTRS's

side pipes 3" x2

8.55:1

89mm bore

Another motor we built

more head porting than mine

BP98 with 10% methanol

264 9.7 15psi@3600rpm

614kw at the engine 22psi

-10's

side pipes 3" x2

8.7:1

89mm bore

Edited by BoostdR
BoostdR Mentor

BoostdR

Posted
Posted

I actually feel -10s will flow more. The anti-surge comp cover reduces efficiency to bring boost on slower to reduce surge. For a 3ltr I would go the garretts.

As for cams we went with what works. Used to use JUN 272's and ordered 264 by mistake. The results were more power everywhere. For under 400kw I would go mines shorepro. 252 10mm or whatever they are.....

I had the Gibson cams dialed. I can't remember exactley what they were. Something like 278 292 10.5 staggered but I think that wasn't at advertised duration. Will have to dig up the sheet for you guys. Base circle was 1mm under aswell.

Piggaz Grand Master

Piggaz

Posted
  • Author
Posted

I actually feel -10s will flow more. The anti-surge comp cover reduces efficiency to bring boost on slower to reduce surge. For a 3ltr I would go the garretts.

As for cams we went with what works. Used to use JUN 272's and ordered 264 by mistake. The results were more power everywhere. For under 400kw I would go mines shorepro. 252 10mm or whatever they are.....

I had the Gibson cams dialed. I can't remember exactley what they were. Something like 278 292 10.5 staggered but I think that wasn't at advertised duration. Will have to dig up the sheet for you guys. Base circle was 1mm under aswell.

I was looking at the 260's @ 10.8mm. Thoughts?

The Gibson cams are HUUGE. I wonder why they went for such huge duration?

Marko R1 Grand Master

Marko R1

Posted
Posted

I was looking at the 260's @ 10.8mm. Thoughts?

The Gibson cams are HUUGE. I wonder why they went for such huge duration?

gibson used big cams because they work - unless gibson was smoking the same stuff as jim souvas & rob ward :)

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