Racepace Built R34 Gtr Nur Rb28 V-cam

[AtomicBomberMan]

Thank you guys for feedback!

I sold the Nismo plenum to another fellow member. Beno said that the Nismo plenum is good for mildly tuned RBs; but for RB28 its actually going to reduce output! He measured the inlet and the Nismo one is smaller in diameter compared to the stock item. The chamber of the Nismo carries more volume though and therefore beneficial for standard capacity RBs.

Sorry for the late post, but once again, like the stock harmonic balancer in a previous post, i don't totally agree with beno regarding the Nismo plenum. Here is a "track proven" RB28 we are all familiar with, with a significantly higher output than yours.

Picture of Nismo plenum from the m-speed site

in no way is this engine "standard capacity" or "mildly tuned" I have seen the M-speed car and crew/team in person and I believe i can quite safely say that M-speed (and many other japanese teams) work on an unlimited budget. If the Nismo plenum really did reduce power output, i'm sure one of the many engineers they have working on this engine during R&D and would have picked up on it and not used the Nismo plenum. The group A cars in japan also used this plenum. Not knocking Beno and his wealth of experience and knowledge, but i find it very hard to write off the experience and knowledge gained from years of R&D of the Japanese. Especially with the budgets involved.

That aside, fantastic looking car. Seems as if the budget for your car is unlimited too!

[Roy]

Interesting, some food for thought ...i wonder since the M-Speed car doesnt run V-Cam, perhaps runs dramatically different cams and head porting. I think the strength of each respective approach is they as a package they work, so perhaps there are some/enough differences to actually result in a different outcome

[Beer Baron]

yeah the M-speed car has a few things that fly in the face of lots of aussie experience with track RB26s. it used an N1 NUR balancer (only marginally different to stock, but they now use an ATI one I'm told), it uses a wet sump (and no extension, partly due to ride height), no pedal box etc. on the other hand it has extensive suspension geometry changes, massive change in roll centre, ride height is super low, lots of aero, lots of weight savings, hollinger box etc. the apexi turbos they use are a good thing too. they do have extensive head porting as well, and cams but as you saw no v-cam, but with the diffs they run and the ratios in the hollinger low down power I would say is not such a concern as it would be easy enough to keep the thing on the boil. I doubt it would spend much if any time under about 5,000 at the track.

BUT having said all that it's a very different car to Matts. it's a balls out track car. about as close as you can get to a super GT car without going space frame/carbon tub and starting with a clean sheet.

I do agree with dazmo that the HKS turbos are more than just a badge. they do seem to out perform the generics, but your tuner has had good success with the -5s so it makes sense to take his advice. I also agree with him about the happy dynos in japan and the fact that you can never really accurately compare 2 runs on different dynos on diferent days let alone in different countries etc. 202kw @ 14.5psi on an RB28 with 2530s is certainly reasonable though too.

most tuners in japan tune on the dyno but do the bulk of tuning on the wangan or other freeways and roads, or on the track if it's a track car. they are big believers in tuning cars under their operating conditions which is ideal. sadly it's also illegal and dangerous. lucky for them they don't have such a problem with the legalities or the danger as people are used to seeing a GTR fly past at 240kp/h on the freeway. hell the workshop I use in japan which tunes everything from civics to top D1 cars up to Super GT cars to lots of GTRs has an ancient bosch dyno that uses special sheets of paper that only read to about 300ps and uses an arm and needle to scribble the power line on the special graph paper like a seismograph! they use it for running in and basic tuning, then do final tuning on the road and freeway. many big tuners in japan don't even have a dyno for that reason.

anyway I've gone a bit OT. I'm sure your car is all that it should be. and if you have any doubts I'm happy to come and take it for a spin and let you know how it compares to some of the top Jap 2.8 V-cam set-ups I've been in/driven....

[NickR33]

anyway I've gone a bit OT. I'm sure your car is all that it should be. and if you have any doubts I'm happy to come and take it for a spin and let you know how it compares to some of the top Jap 2.8 V-cam set-ups I've been in/driven....

haha very nicely snuck in there BB...

...shotgun?

[Rapier46]

slick

[JAGR33]

Well done Matt, you definetly have the ultimate street/circuit GT-R, possibly one of the best in the world. Your 'no cutting corners' attitude and Racepace's knowledge, experience and very high build quality standards has truly yielded an impecable result. A car that drives and sounds similar to a standard GT-R with that power curve is the difference between this car and most other GT-R's running similar power.

A TRULY AMAZING CAR!!!!

P.S When can I go for a ride????

[tangomatt]

Hi Jack,

Thanks, I think all credit goes to Racepace.

I asked Chris/Beno whether there is anymore (power) in the engine with further tuning and higher boost. The answer was to the effect of 'the brighter it burns; the shorter it lasts!'

Pm sent.

Cheers

Matt

[AtomicBomberMan]

yeah the M-speed car has a few things that fly in the face of lots of aussie experience with track RB26s. it used an N1 NUR balancer (only marginally different to stock, but they now use an ATI one I'm told), it uses a wet sump (and no extension, partly due to ride height), no pedal box etc. on the other hand it has extensive suspension geometry changes, massive change in roll centre, ride height is super low, lots of aero, lots of weight savings, hollinger box etc. the apexi turbos they use are a good thing too. they do have extensive head porting as well, and cams but as you saw no v-cam, but with the diffs they run and the ratios in the hollinger low down power I would say is not such a concern as it would be easy enough to keep the thing on the boil. I doubt it would spend much if any time under about 5,000 at the track.

BUT having said all that it's a very different car to Matts. it's a balls out track car. about as close as you can get to a super GT car without going space frame/carbon tub and starting with a clean sheet.

Yeah BB, you're exactly right, no argument there, Matts car compared to Mspeed is like chalk and cheese. However, i do believe the philosophy behind the engine build would be very much the same. Make it go as hard, as fast and as responsive as possible. Plug Matts engine into the mspeed car, do you really think it would be light years behind? If Matt really ONLY wanted a car for the street, i doubt he would have gone through all this trouble. I've never met Matt, but judging by his use of fine ingredients combined with all the relevant herbs and spices, I think i can quite safely say that his inspiration did not come from something of the street.

Mspeed do use an ATI balancer

Here is another Balltearer GTR from the Japanese with ATI, V-CAM and Nismo Plenum

[SimonR32]

and a t04Z :-)

[tangomatt]

When we were planning for the build, I was prepared to purchase whatever that was deemed necessary to benefit power and responsiveness on a RB28 platform.

If Racepace had recommended ATI damper, Nismo Plenum (which in fact I purchased and subsequently sold); HKS 2530s; fuel rails/pumps; surge tanks; carbon drive shafts; head upgrade; whatever cam profile etc. etc. I would have sourced them and incorporated in the build.

The real inspiration came from Racepace own demo R33GTR. Basically the brief for my build was to replicate the way that car drove as close as possible and keep it smooth and quiet to avoid unnecessary attention on the roads.

[satanic]

No disrepect, beautiful car but your last post makes it sound like you simply have a big cheque book and not much knowledge about the car at all. Almost like paying someone else to carry out their wildest, wettest dreams.

[tangomatt]

satanic Posted Today, 03:55 PM

No disrepect, beautiful car but your last post makes it sound like you simply have a big cheque book and not much knowledge about the car at all. Almost like paying someone else to carry out their wildest, wettest dreams.

I guess that is true to some extent (except I don't have a BIG cheque book, just a limited one) as I am relying on a third party to take care of the engine side of things. Knowledge about the car I have, albeit not enough to dictate exactly what components; brands; specs for the engine builder to use. It is a bit of blind faith involved when I, myself does not have the mechanical know how. The situation with the engine is mainly I do not want to be in a situation where a component that I specifically stipulated is blamed for an unexpected failure or diminished performance.

As for the rest of the car, the bodykit, brakes, wheels, tyres, interior bits and pieces; clutch (list goes on) choices I have all selected meticulously myself. I think I have personalised my car that way and made it uniquely mine!!! So, 'NO' I have not let someone else create my wildest and wettest dream!

[JAGR33]

No disrepect, beautiful car but your last post makes it sound like you simply have a big cheque book and not much knowledge about the car at all. Almost like paying someone else to carry out their wildest, wettest dreams.

Stan, there is a reason why Matt's gone about his build the way he has. His biggest mistake was taking the Racepace GT-R for a drive. He loved not only the power but the way it drove, so quiet and smooth. Now if you wanted the same performance as the Racepace GT-R would you be telling Ben what to use or not use during the build? Who cares what is used as long as the result is the same. You want to drive the car and experience the same result.

I would have done exactly what Matt did for this build (money permitting), no need to question or dispute Ben's decisions, the results speak for themselves...

[NickR33]

Well put Jack

The reason Matt did his research is to find a workshop that made a product he wanted... then let them make it to the best of their ability... good workshops know what parts work best and I can tell you nothing pisses them off more than customers coming in with parts they have bought and insisting the workshop use them... then getting shitty when the final result is not up to expectations

[LotusGTR]

No disrepect, beautiful car but your last post makes it sound like you simply have a big cheque book and not much knowledge about the car at all. Almost like paying someone else to carry out their wildest, wettest dreams.

Thing is that not all of us have the knowledge to match our passion. I can't get enough of my GTRs but my knowlege is limited, albeit growing, but ultimately I'm too busy doing something else to ever become an expert. If you've got the cash and the passion then why not I reckon. It's risky as you need to pick the right people to put your faith in, but once found, then away you go.

[tangomatt]

satanic Posted Today, 03:55 PM

No disrepect, beautiful car but your last post makes it sound like you simply have a big cheque book and not much knowledge about the car at all. Almost like paying someone else to carry out their wildest, wettest dreams.

I guess that is true to some extent (except I don't have a BIG cheque book, just a limited one) as I am relying on a third party to take care of the engine side of things. Knowledge about the car I have, albeit not enough to dictate exactly what components; brands; specs for the engine builder to use. There is a bit of blind faith involved when I, myself does not have to mechanical know how. The situation with the engine is mainly I do not want to be in a position where a component that I specifically stipulated is blamed for an unexpected failure or diminished performance. Certainly I questioned intensely the Racepace approach to engine building and doubted why things were done in a certain way, and every time each of my concerns were answered unequivocally, with 100% confidence and data to back up from their own research and customers cars!

As for the rest of the car, the bodykit, brakes, wheels, tyres, interior bits and pieces; clutch (list goes on) choices I have all selected meticulously myself. I think I have personalised my car that way and made it uniquely mine!!! So, 'NO' I have not let someone else create my wildest and wettest dream!

[Import Monster]

No disrepect, beautiful car but your last post makes it sound like you simply have a big cheque book and not much knowledge about the car at all. Almost like paying someone else to carry out their wildest, wettest dreams.

I've got a reasonable idea of how the human body works, I use and abuse one every day - but I wouldn't remove my own spleen, even though I knew the end result I was looking for

[Aaron34]

Stan, there is a reason why Matt's gone about his build the way he has. His biggest mistake was taking the Racepace GT-R for a drive. He loved not only the power but the way it drove, so quiet and smooth. Now if you wanted the same performance as the Racepace GT-R would you be telling Ben what to use or not use during the build? Who cares what is used as long as the result is the same. You want to drive the car and experience the same result.

I would have done exactly what Matt did for this build (money permitting), no need to question or dispute Ben's decisions, the results speak for themselves...

The proof is in the driving and what the seat of the pants has to say. The dyno numbers are easy to crank up with some boost, timing and a little less fuel. The stig knows !!

[elrodeo666]

Matt hope you dont mind but seeing there is a bit of eye fruit being put up, heres a mate of mine's 34 with V-cam and T-O4Z setup..

[handbrake]

No disrepect, beautiful car but your last post makes it sound like you simply have a big cheque book and not much knowledge about the car at all. Almost like paying someone else to carry out their wildest, wettest dreams.

LOL

"No disrespect, but Im just going to say something disrespectful"

Nice build, and good thread. Keep it coming.