Dyno Results

[SimonR32]

It'll be interesting to see how it goes with more ignition pumping in there. Hopefully improve that midrange.

The .78 is an interesting housing, it should have the best of both worlds (good respective points of the .68 and 82)

Twins would be on nearly 1000rpm sooner (5k rpm/200rwkw is fairly laggy in my book for a GT35/700hp setup) so it gives room for lots more tuning and playing once you get stuck into it

ps. my t04z rated at 800hp is making 200rwkw at 4250rpm and has the potential to make at least a extra 100-150rwhp more than the twins your talking about...

250rpm for over 100hp, ill take that thank you

[pepe lopez]

I'm with Nismoid here. With cops and EPA ruining it for all of us, I figured that you would forsake low mounts for a single high mount once you wanted more than 380rwkw. Whats wrong with running -5's for 350-380rwkw, are you telling me they are not responsive.

For the record I've had HKS 2530's and a T88H-38GK in the same car and I prefer the single over the twins, but I only swapped cause I wanted more power.

In the current enviroment, I really dont think I will ever go a single again, which is a shame. I have a 34 now which will more than likely see -5's, fingers crossed with Ben's 2.9 kit

Kemp, if these arent issues where you live, then ignore my post, its not relevant to your situation, enjoy your GTR, 300rwkw is fast no matter what you use.

[R31Nismoid]

Sorry, what do you base that on? It's making 16psi at 4k, what twins make 16psi at 3k and are able to support 700ps? (~550+rwhp). Forget what "power" it's making, thats obviously just a product of the tune.

I'm running HKS 2835 48T's which are rated at 760ps (not much more than a .86 GT35) and they don't see full boost (1.7bar) until 5800 in 4th...

read on

dont worry brockas he loves comparing apples to ballbearings to support his twins fantasy

Nothing to offer again ey? Getting a bit repetative these posts with no info other than nothing you can substaciate

I had a 600hp GT30 in the .82, and given it was 100hp less, it certainly wasnt 5000rpm before 200rwkw.

Nearly 600-800rpm earlier, and thats on a stock head RB25 on what most would call an inferiour setup being i didnt have the wonderful

cams/cam gears

split pulse housing/manifold (and remember its a smaller housing also)

RB26 plenum/throttle bodies

So moving along...

Here is Snowmans graph using -5's Click ME!!!

Now, obviously that providing the conversion is right ...

Snowies numbers appear to be:

3500 rpm: 125kW (100km/h)

4000rpm: 180kW (114km/h)

4500rpm: 255kW (128km/h)

On the assumption that 114km/h in 4th equals 4000rpm.

Im no gearing/rpm expert so perhaps someone else might be able to confirm more closely.

Either way, the -5s and GT35 are similar in what they should be delivering, i even think a set of -5's is bigger?

You can see from the graph on the first page there is not the midrange ramp one would expect, boost control you can see is a bit wavy could be due to the igniton issues etc.

Not saying its a bad result at all. There is just room for some improvement, (based on the graph linked above, without a doubt once the setups initial issues are sorted and then follow up results posted that should be indeed better

Cheers.

[R31Nismoid]

ps. my t04z rated at 800hp is making 200rwkw at 4250rpm and has the potential to make at least a extra 100-150rwhp more than the twins your talking about...

250rpm for over 100hp, ill take that thank you

So basically you backed up what i put in my post on the first page anyhow about it being not as responsive as you'd think

Top work there, its all very compareable and you know it

[djr81]

....

Edited May 22, 2008 by djr81

[esky_mad]

hmm why does it seem that SAU is turning into the likes of NS.com these days....

dont worry im not hear to barrage your thread lol.

considering igniton problems 316kw is far from ordinary, interested to see what it comes out with once any/all the bugs are ironed out.

GL.

[RPMGTR]

hmm why does it seem that SAU is turning into the likes of NS.com these days....

GL.

So true!

No need to bash the guy for doing something a little different now...

And I'm a big fan of twins on GTR's with the way current EPA/regs are.

But, the 3540 should go really well when its sorted.

These turbos seem to have really good response for the power they make.

Good luck with it.

Edited May 22, 2008 by RPMGTR

[STATUS]

yeah its a perfect daily cant believe how responsive it is

feels alot more responsive then when it was all standard

ill post up the new dyno results once i have upgraded the ignition system, im just abit broke to do it right now

nice im sure he ignition system mods will help with the troublesome top end. Ive tested a few of the superspark RB26 coils and had no issues (nice budget price) if your looking for something differrent.

i actually just finished dynoing the K5.... im suprised how much more mid range it has compared to the smaller GT35R.. kinda defy's logic. Results were made on our new dynapck which reads within a poofteenth of all the dyno dynamics round here and and about 10-15 less than the dts ones..

for refferrence as i cbf posting the rpm vs kw and NM 120kmh is equivalent to 4700rpm

[Brockas]

So basically you backed up what i put in my post on the first page anyhow about it being not as responsive as you'd think

Sorry obviously I didn't ask the question clearly enough in my previous post.

Which twins make 16psi at 3000rpm and support 700ps?

I had a 600hp GT30 in the .82, and given it was 100hp less, it certainly wasnt 5000rpm before 200rwkw.

I bet if your ignition was breaking down and it was a basic tune it would be a different story.

Why on earth are you looking at the power level, and trying to compare turbos?

I've seen the same turbo act completely differently on 2 seperate cars simply due to the tune, and I'm sure I'm not the only one. Telling him a pair of twins would instantly make this car more responsive is delusional at best...

[R31Nismoid]

No idea Brockaz - maybe you should go and read the posts?

I never made mention about any 700ps/hp/whatever turbos making 16psi @ 3000rpm. Maybe you could go and find the post that clearly states that, because i've read the whole thread 4 times now and still cant find any reference

Im looking at delivery/response and power all together actually. Again, please go back and follow this order.

Read, comprehend, post

I think its a good result, owner is happy too... owner knows there is more work, and im sure like everyone else, im awaiting the end results of it all.

Hell i'd prefer a single on my car for a number of reasons if the local constabulary would let me get away with it.

Cheers.

[SimonR32]

to be honest. i dont think that anyone has a well setup gt30 gt35 framed rb26 on here...

but considering the bigger garrett singles are only a bees dick away in terms of response then i can only see it being a matter of time before someone gets it right and you see how responsive they can be

ps. we are lucky over here in wa, dont have epa... saying all this i love low mounts, i just think a well set up high mount, or twins can always be better

[Public Enemy]

Why does / would the EPA frown on a high mount turbo setup. It's doing the exact same thing at twin low mounts only better and more efficiently. Surely emissions don't change based only on 1 or 2 turbos and where they are located.

[R31Nismoid]

Long story, but lowmounts you cant see, and are the same size. Therefore you dont know they are differnt.

EPA ruling (here in vic) states you cant change any part that alters emissions for the most part... so ecu, injectors, turbos, cams, AFM etc etc

More to it but dont wanna hijack the thread

[DCIEVE]

to be honest. i dont think that anyone has a well setup gt30 gt35 framed rb26 on here...

but considering the bigger garrett singles are only a bees dick away in terms of response then i can only see it being a matter of time before someone gets it right and you see how responsive they can be

ps. we are lucky over here in wa, dont have epa... saying all this i love low mounts, i just think a well set up high mount, or twins can always be better

not looking very hard then

gt35 with 0.82 and everything you can think off to make it work

edit: sorry should add thats running 1.6bar, and massive wheel spin on the dyno to the point the tyres starting delaminating (http://i209.photobucket.com/albums/bb146/h...coupe/dyno3.jpg) so we had to stop (injectors at 100% duty cycle also). Tyres and lack of fuel meant we only moved the cams once before calling it quits.

Edited May 23, 2008 by DCIEVE

[GeeTR]

Nice one Dcieve. Is that a stock GT3582??

[DCIEVE]

Yep using a 3582 as it came out of the box.

Should add the curve is a little misleading as the car would rev quickly to 6500 then hold there for a few seconds while the rollers caught up (with chunks of rubber spraying the wall), before revving out the last 1500rpm.

Edited May 23, 2008 by DCIEVE

[Brockas]

No idea Brockaz - maybe you should go and read the posts?

I never made mention about any 700ps/hp/whatever turbos making 16psi @ 3000rpm.

Twins would be on nearly 1000rpm sooner (5k rpm/200rwkw is fairly laggy in my book for a GT35/700hp setup)

Apologies, must be a misunderstanding.

He obviously wants a 700hp rated turbo setup for future mods/tune, so why bother mentioning that 550-600hp rated turbos would be on sooner? Captain obvious in fine form...

I'll keep my opinion that equivalently sized twins/singe will produce the same boost at the same RPM, and you can keep measuring response by how much power it makes at a certain RPM

Edited May 23, 2008 by Brockaz

[SLIPPERY]

too much arguil around here

[STR8E180]

i personally dont care if twins would be more responsive

the car is my daily so i wasnt to fuss with trying to get max responsive i went with the single turbo conversion because it was alot more eazy and it also makes it more eazy to work on

im happy with the response it makes as it is so i wont be changing it

if i was building a full track car i would of went with twin GT2560 with custom steam pipe manifolds with twin TiAL 38mm gates i also would of spent more money on the cylinder head with a bigger lift cam and port work but like i said the car is my daily so i didnt see any point spending bucket loads of cash

[SimonR32]

not looking very hard then

gt35 with 0.82 and everything you can think off to make it work

edit: sorry should add thats running 1.6bar, and massive wheel spin on the dyno to the point the tyres starting delaminating (http://i209.photobucket.com/albums/bb146/h...coupe/dyno3.jpg) so we had to stop (injectors at 100% duty cycle also). Tyres and lack of fuel meant we only moved the cams once before calling it quits.

haha sorry nick, i was going to mention yours but i dont know the diff ratios compared to road speed of r31 so its hard to compare with r32 gtr's

give me some rpm to road speed ratios