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RB26DETT Huffer Upgrade

gun-r32

By gun-r32,
in Engines & Forced Induction

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Mik Experienced

Mik

Posted
Posted
in my experience the 2530's come on about the same as stock turbo's(3500rpm), were as cars wich have GT-RS's kick hard at 5000rpm.

What do you mean by "come on"? A stock GTR seems to make 1kg/cm boost by about 3300RPM under load. There is no way 2530s will do that.

All the ones I've seen (I'm not saying it can't get better) make 1 bar at just under 4500RPM.

Beer Baron Grand Master

Beer Baron

Posted
Posted
Here is the dyno graph for Antz car. I took a pic of them yesterday. The dyno reads 10% and reads 360rwhp = 396rwhp taking into consideration10% loss. This works out to just under 300rwkW and Im sure if we were to run the car on a calibrated dyno that it would read 300rwkW.

that is a great result mate. 2530s on a GTR is a nice combo.

I'm not to sure on this "their dyno is low so I ad 10, divide by two, plus my age, times 11 equals the true figure" business though. to me that graph says 360hp. if their dyno is not correctly calibrated then they should get it fixed and you should probably take the car somewhere that has acurate, operating equipment. otherwise you are just speculating so what's the point of having it dyno'd for a power figure in the first place?

180bfj20det Community Regular

180bfj20det

Posted
Posted
to me that graph says 360hp.

LOL, come in your car and race and see if its not 400rwhp. This dyno reads 10% low and has been verified over and over and if anything the dyno reads slightly lower than 10%. We don't really give two shits what it reads in the end because we're not there for the dyno, we're there for Matt Spry which is an expert tuner. If we want to see the power, we'll take it to another dyno that is accurate or hell one that reads higher than normal...then you'll believe the car makes 500rwhp with n1 and standard fuel pump just cause the dyno said so.

otherwise you are just speculating so what's the point of having it dyno'd for a power figure in the first place?

Speculating? Read above, we're not speculating but at the worst, misestimating by 2-3 % either way. Point of having it dyno'd for a power figure? LOL...it wasnt to get a power figure....it was to tune the car with the recent addition of N1 turbos. And anyway, it is a trialled and proven combination: N1 turbos make 300rwkW and thats not 360rwhp.

Gav Mentor

Gav

Posted
Posted
In my experience, no, they don't.  A few facts, we get 1 bar out of the 2530's at under 4,000 rpm on the RB26.  The GTRS moving parts (compressor, shaft and turbine) weigh 25% more than the 2530 moving parts.  So there is simply no way that they can be as responsive, given all else being equal.

This experience is not unique, the 2 fastest GTR's at Tsukuba again this year where both running 2530's.  If the GTRS's where as responsive and made more power, I am sure the unlimited budgets would have funded them.

:)

Before my engined failed, I was getting the same boost almost 1,000 revs higher with GT-RS terbs, so even with "tweaking" the cam timing, it just won't be possible to get the same response out of the larger terbs as SK says.

I'm believe with the head work, cams and internals that I've had done to support high RPMs that I will be able to reap the benefits that these terbs should offer over the 2530s. Will need to wait until I get the motor rebuilt ( again ;) ) to quantify the benefits (if any).

Ants Grand Master

Ants

Posted
Posted
Ant - nice work mate, great that the stock AFM's and pump managed that much!

that is the way a graph should look :wassup:

Sorry mate did not get a print out of the boost curve, all I could tell you is that we managed to get that power @ 17.75pds which sounds about right to me.

Ants Grand Master

Ants

Posted
Posted
Ant...do you have a graph with a boost curve?

Sorry mate did not get print out of the boost curve, all I could tell you is that we made that power at 17.75pds. It was enough to blow the intercooler piping off as well.

Ants Grand Master

Ants

Posted
Posted
that is a great result mate. 2530s on a GTR is a nice combo.

I'm not to sure on this "their dyno is low so I ad 10, divide by two, plus my age, times 11 equals the true figure" business though. to me that graph says 360hp. if their dyno is not correctly calibrated then they should get it fixed and you should probably take the car somewhere that has acurate, operating equipment. otherwise you are just speculating so what's the point of having it dyno'd for a power figure in the first place?

No need to fuss about this, as I will do a power run on Chiptorques dyno which will give another result all together. I know that all dyno's read differently to one another but as far as I'm aware I am adamant that the power figure is closer to 300rwkw than anything else.

Gav Mentor

Gav

Posted
Posted
No need to fuss about this, as I will do a power run on Chiptorques dyno which will give another result all together. I know that all dyno's read differently to one another but as far as I'm aware I am adamant that the power figure is closer to 300rwkw than anything else.

Antz

The power curve seems a bit "peakier" with full power a bit later in the rev range than I would have expected with 2530s.

The link below is what I achieved with what should be laggier GT-RS terbs. Note that there had been minimal setup of cam timing and boost was a moderate 17 psi or so.

http://www.skylinesaustralia.com/photopost...&cat=500&page=1

Ants Grand Master

Ants

Posted
Posted
Antz

The power curve seems a bit "peakier" with full power a bit later in the rev range than I would have expected with 2530s.

The link below is what I achieved with what should be laggier GT-RS terbs.  Note that there had been minimal setup of cam timing and boost was a moderate 17 psi or so.

http://www.skylinesaustralia.com/photopost...&cat=500&page=1

Nice going Gav, 473hp is very nice indeed. GT-RS turbs are laggier though.

Things to note, is that my turbos are not 2530s and in fact they are not even ball-bearing, hence the spool up delivery is certainly not as instant as bb turbochargers.

Even my bros. gets ahead of me in the lower rev range and he has an FJ20 (na block) with a GT30R!

Gav Mentor

Gav

Posted
Posted

Ahh.... sorry Antz, that's what happens when I don't read the thread correctly!

Hope to have some reliable mid 550rwhp after the next rebuild and with a bit of work should be able to bring on the boost a bit sooner and eliminate the terb shuffle (although it does get other driver's attention when it sounds like a train is approaching them!)

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