Rb26 or rb30???

[Stixbnr32]

10 hours ago, Piggaz said:

-5’s are too BIG for a 2.6. My god they’re a heap of shit to drive on a 2.6. Again, have you driven that setup? You’d be pumped to the moon and back by a euro hatchback.

I wouldn’t piss on those new journal bearing shitheaps from HKS. Waste of time.

You may be only looking at where they “fall off”... but how they drive and how the come on is chalk and cheese.

The GTR is a big, heavy heap of shit with tall gearing with the 5 speed and can’t be helped by any “smarts” in the engine bay (like VCT). It’s a small stroke, low comp donk with a dumb head. It needs all the help it can get to push around that pork!

It’s ok, I own one, have had for 15 years. But to own one with a 2.6 is a no go for the above reasons.

hahaha i really need to drive a single turbo 2.6 to see what its like.   I have a 400kw R32 with -5's and although i know they are laggy i dont find it a pig.  I suppose you dont know what you dont know right  

 

[r32-25t]

I went from -5s to the precision 6466 and the difference was huge and it was all I changed between setup 

[Stixbnr32]

19 minutes ago, r32-25t said:

I went from -5s to the precision 6466 and the difference was huge and it was all I changed between setup 

rear housing size?

[r32-25t]

1 hour ago, Stixbnr32 said:

rear housing size?

.84 twin scroll

[joshuaho96]

11 hours ago, Piggaz said:

-5’s are too BIG for a 2.6. My god they’re a heap of shit to drive on a 2.6. Again, have you driven that setup? You’d be pumped to the moon and back by a euro hatchback.

I wouldn’t piss on those new journal bearing shitheaps from HKS. Waste of time.

You may be only looking at where they “fall off”... but how they drive and how the come on is chalk and cheese.

The GTR is a big, heavy heap of shit with tall gearing with the 5 speed and can’t be helped by any “smarts” in the engine bay (like VCT). It’s a small stroke, low comp donk with a dumb head. It needs all the help it can get to push around that pork!

It’s ok, I own one, have had for 15 years. But to own one with a 2.6 is a no go for the above reasons.

I flipped it backwards, -5s are too big, correct. But GT3-SS turbos are tiny, 0.54 a/r exhaust turbine which is tighter than any other turbo out there. They nose over hard on 2.6, so the concern is that a 2.8 will just shift everything down a few hundred RPM and make the engine feel like a Mazda 2.5T where the power falls off a cliff well before redline.

The HKS turbos may be a waste of time/money but it's already too late, the turbos are bought for and installed so I'm just going to see how they go. The engine isn't at the point where the bottom end is going to be taken apart yet so it's going to just be a 2.6 for now. I have a VCAM step 1 sitting in the garage so that can be a first attempt to try and get the VE up earlier to spool the turbos. If that doesn't get the desired powerband then I'll think about a stroker or RB26/30.

I'll post dyno charts and data logs as I work through this, if it sucks you guys can have some fun pointing and laughing.

[r32-25t]

2 hours ago, Stixbnr32 said:

hahaha i really need to drive a single turbo 2.6 to see what its like.   I have a 400kw R32 with -5's and although i know they are laggy i dont find it a pig.  I suppose you dont know what you dont know right  

 

You going to gtr fest on the weekend?

[Shoota_77]

I must say my car back when it ran was a laggy bucket of shit on the -5's but at the same time goddam it was fun once the boost kicks in!!

This is a weird statement to a degree but the better a turbo setup is, the worse it feels!!  What I mean by that is a smooth power curve from low down in the rev range doesn't have anywhere near the wow factor of a laggy turbo when it hits it's happy zone.  The better sorted car will be a waaaaaay better and quicker car (until high in the rev range anyway) to drive but it just doesn't have that raw "Holy f#$k hang on boys she's off" kind of feeling!  I drive a lot of the modern turbo cars that would be way faster than my car but they're boring AF compared to a laggy turbo coming on song!

[GTSBoy]

54 minutes ago, Shoota_77 said:

This is a weird statement to a degree but the better a turbo setup is, the worse it feels!! 

Traction is the other thing though. When you have a knife edge boost response at higher rpm, the sudden transition to torque and power is more prone to make the tyres break. It is so much better to be applying torque to the road at lower rpm and gaining speed, Makes them tend to stay stuck to the road for longer. Not to mention it is more modulatable.

[Old man 32 GTR]

My thoughts are this, and I’m still torn here. But 

you wouldn’t get a Hakosuka GTR and pull the engine out (it has been described as the laggiest NA motor ever produced) and drop an SR20 into it, then say, it drives much better. 
this would probably be true, but you’d be missing the point. 
Now, I’m not saying our cars are at that same level, but I believe they are going in that direction. So I’d like to try to get my car when I want it, while it is still somewhat affordable (should have done it a couple of years ago) lol 

At this point, I’m even considering putting a getrag in it, over a sequential. 
but we’ll see where things go. 
As Piggaz said, they are a big heavy bucket of shit! 
but isn’t that why we love them, Clarkson said, it’s the flaws and imperfections in a car that we bond to. If it was perfect, it would be boring. 

[Predator1]

16 hours ago, burn4005 said:

Alcons?

Yep. Do you have those?

[Stixbnr32]

2 hours ago, r32-25t said:

You going to gtr fest on the weekend?

Im in Auckland,NZ so no  .  

[Darmanin10]

Performance wise, bigger is always better. More torque, easier power.

But I was told by my engine builders that the 30 blocks are not as good for circuit work. Something to do with the harmonics I think? Anyone heard similar?

Therefore I built a 2.6 and didn't go stroker mostly due to cost, as I wanted to keep it simple and reliable as possible on the track. Probably should have gone a 2.8, but I wouldn't have been able to help myself, and I would have gone bigger turbo, sequential etc etc

[GTSBoy]

13 minutes ago, Darmanin10 said:

30 blocks are not as good for circuit work. Something to do with the harmonics I think? Anyone heard similar?

It's not really the block, at least wrt the harmonic issue. The 30 block is certainly not as good as the 26 (typically, on average, there are always examples at each end of the bell curve) simply because it is taller. The squatter shape of the 26 block makes it stronger in a few places where it counts.

The harminic issue is in the crank. This can be minimised with a billet crank and upgraded balancer, as well as careful tolerancing etc etc. Every last detail helps kinda thing.

[r32-25t]

3 hours ago, Stixbnr32 said:

Im in Auckland,NZ so no  .  

Dam was going to offer you a ride 

[Piggaz]

18 hours ago, r32-25t said:

Dam was going to offer you a ride 

Isnt your car pushing water with a busted head gasket?

[Dose Pipe Sutututu]

25 minutes ago, Piggaz said:

Isnt your car pushing water with a busted head gasket?

Just top it up and off you go again, has a VW or Audi feel to it. Every time you fill up your fuel, top up your oil & water 🤣

[r32-25t]

3 hours ago, Piggaz said:

Isnt your car pushing water with a busted head gasket?

Yep

 

3 hours ago, Dose Pipe Sutututu said:

Just top it up and off you go again, has a VW or Audi feel to it. Every time you fill up your fuel, top up your oil & water 🤣

Just been doing this, taking it to gtr fest on the weekend and then parts I’m replacing start coming off 

[SiR_RB]

6 hours ago, r32-25t said:

Yep

 

Just been doing this, taking it to gtr fest on the weekend and then parts I’m replacing start coming off 

See ya there mate 

 

also recently tossing up going 3L

we went 2.8 high comp shit load of head work and couldn’t be happier 

 

[burn4005]

On 12/9/2020 at 9:41 AM, Predator1 said:

Yep. Do you have those?

CR6380s and 380mm on the front from brakes direct.

using 350mm 370 rotors and stock calipers on rear but am considering upgrading to CRB356 and 355 rotor.

[Predator1]

Nice! How are those brakes? Are they really that good as they claim? My car isnt running yet. Final stages.