Building An Rb26 For Response....

[Nismo 3.2ish]

What gearbox?

Factory standard R34GTR

[Duncan]

Hi Duncan

The head work does not have to be done if I do not want it, I asked him to quote to see what else could be done as it will be the time to do it if I want it .

I will ask him about what you have all said

BUT if it was done as is, HOW would it be, would it drive well on the street ?

No idea mate, I've never driven a car with a ported head. But what I expect is it will flow better at high revs at the cost of low rev torque. Same effect with larger valves; they are both about making top end power.

[The real NISMO1]

Hi Duncan

That is basically what he said, it will be torquey, but the head work will also give me some extra top end power.

I was not really wanting to know about the head work, I was asking about the total build in general.

It is going to have a lot of response and with the head work it should keep going at higher revs.

I was told by a bloke I respect that I should change the cams to 260 x 10.8 and I am thinking of doing that but I would like to know how it will be with the list I posted????????

Thanks

Pete

[hypergear]

Just run a SS Alpha Variable geometry turbo. That will gives you both down low and up top. Use it on stock engine, factory cams and factory cam gears. Saves heaps of marking around also.

[The real NISMO1]

Just run a SS Alpha Variable geometry turbo. That will gives you both down low and up top. Use it on stock engine, factory cams and factory cam gears. Saves heaps of marking around also.

Never heard of them and I will check out your web site, why isn't everyone using them , cost too much, not reliable, hard to get, load of crap or not in the main stream yet?

Must be a great Turbo to be able to do that but how do the standard motors like it and without all of the other things that combine to make a tough fast car reliable?

[The real NISMO1]

No idea mate, I've never driven a car with a ported head. But what I expect is it will flow better at high revs at the cost of low rev torque. Same effect with larger valves; they are both about making top end power.

From what I could find out, once you get something like 3.2 stroker you will need the air to flow free at the top end or it could choke.

But interfere with your response? maybe help it?

[wolverine]

It could choke if you have a ridiculously large turbo for a DD.

[Ben C34]

A proper port job by someone who knows what they are doing won't sacrifice anything.

Which means not needlessly enlarging the ports which hurts gas speed.

It will gain everywhere.

It's way more complicated and time consuming to do it well than most people can imagine.

If I had the cash I would definitely get a gun head porter to work their magic.

Edited June 29, 2014 by Ben C34

[hypergear]

Never heard of them and I will check out your web site, why isn't everyone using them , cost too much, not reliable, hard to get, load of crap or not in the main stream yet?

Must be a great Turbo to be able to do that but how do the standard motors like it and without all of the other things that combine to make a tough fast car reliable?

VNT systems are not yet the main stream performance turbochargers because the years in practice of the ideology by OEM manufactures is not in high performance field. So it comes down to who made it for what purposes. The most important engineering element of ours is reliability, In which you find all sorts of reported turbo failures except ours.

The development of VNT turbine system has been welly documented, Starting from:

http://www.skylinesaustralia.com/forums/topic/261613-hypergear-hiflow-service-continued/page-390

Check thread index for final outputs. This covered three types with peek power rating from 380rwkws to 490rwkws. Most of evaluations was carried out based on a Rb25det motor, I'll be more then happy to offer free trails if you are in Melbourne.

[Nismo 3.2ish]

It could choke if you have a ridiculously large turbo for a DD.

PT6262

[Nismo 3.2ish]

A proper port job by someone who knows what they are doing won't sacrifice anything.

Hi Ben, That's what I thought from what I have found out so far, if anything help at both ends?

[Ben C34]

Hi Ben, That's what I thought from what I have found out so far, if anything help at both ends?

Hi

I edited my previous post and added more info.

Typically the area they work on the most in the bowl, behind the valves. It's not unusual for the ports themselves to be barely touched.

Most people want to just hack open the ports, which is not the way to go.

A "race port" is extremely vague, as most performance talk, but I'm sure as the engine builder knows your desired outcome they will be porting the head as required.

Certainly people make big power with untouched heads, but there is no doubt that a well ported head will make more power everywhere.

[Nismo 3.2ish]

Hi

I edited my previous post and added more info.

Typically the area they work on the most in the bowl, behind the valves. It's not unusual for the ports themselves to be barely touched.

Most people want to just hack open the ports, which is not the way to go.

A "race port" is extremely vague, as most performance talk, but I'm sure as the engine builder knows your desired outcome they will be porting the head as required.

Certainly people make big power with untouched heads, but there is no doubt that a well ported head will make more power everywhere.

It is CRD full race port head RB26

[GTRPSI]

It is CRD full race port head RB26

So its designed to flow at high RPM at the expense of bottom end torque.

Full Race ported heads genrally have poor low speed velocity flow.

Saying race head can be very vauge as mentioned, a mild clean up without opening runner size would be far better suited to a street application.

One mans race head and anothers are totally diffrent.

Are they deshouding the valves by removing some of the quench pads?

[XGTRX]

Factory standard R34GTR

Hmmm have you budgeted for a stronger one, I think it would be wise. Maybe something you should discuss with CRD if you haven't already done so.

[Nismo 3.2ish]

Hmmm have you budgeted for a stronger one, I think it would be wise. Maybe something you should discuss with CRD if you haven't already done so.

I was under the impression the GTR gearbox was pretty tough and most blokes are running with them?

What do you use??

[Hadouken]

box will be fine if treated well at 400kw. But miss a gear *cough* 3rd *cough*, bye bye 3rd

[Nismo 3.2ish]

box will be fine if treated well at 400kw. But miss a gear *cough* 3rd *cough*, bye bye 3rd

HAHA , that is also a worry of mine but I guess then I will have to change it

[XGTRX]

I was under the impression the GTR gearbox was pretty tough and most blokes are running with them?

What do you use??

Just a standard 33 box in a 26, but I haven't got the torque that you will have, no where near. The torque is what should be considered rather than the power. Just something to investigate anyway. You don't want to be smashing the box first up and have to wait to get one built if it's your dd.

[Nismo 3.2ish]

Just a standard 33 box in a 26, but I haven't got the torque that you will have, no where near. The torque is what should be considered rather than the power. Just something to investigate anyway. You don't want to be smashing the box first up and have to wait to get one built if it's your dd.

I had better do some homework, thanks