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Rb20 Torque Monster :)

SimonR32

By SimonR32,
in Engines & Forced Induction

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hypergear Grand Master

hypergear

Posted
Posted
Sigh... Thats not really a useful comparison. You can clearly see the GT3076 setup has notable issues.

Is there any surge on it Simon? Looks like its building and then just tapers a tad early on the climb up.

Something my 600hp GT30 did, it wasn't really audible eithe which didnt help to workout

I found Simons power curve was alittle odd, I've seen few other members running it on RB20dets it seems to make more mid range but not as much top end. But none of them actually run that much boost either.

Also the comparison dynosheet shown against GT3076s, Those 2x cars got lot more modifications then what my test car has. I believe I have no issues beating them in response, power and torque if I decide to modify mine in the same manner. Except I don't expect any one who uses my turbos to have all those mods.

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SimonR32
SimonR32

Finished tuning the little old RB20 last night using 50% CSR E85 and 50% BP98 mix (to make a E42.5) and was very surprised by the torque... Power was just under what I was hoping for but still very pl

SimonR32
SimonR32

Good to hear you are back on board the power boat roy

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Stao, they are clearly not sorted setups regardless of the level of modification (compared to one that is, again regardless of mods).

To put such a 'comparison' up serves little purpose and would otherwise mislead people that might not be as aware (i think i've had to say that, what, 3 times now? :thumbsup: ).

Are you talking about between 5000-5250?!?

Earlier! Around 3000-3300rpm-ish where it starts coming up and then sorta kicks another bit and goes up harder.

Could just be the way it is :P

JonnoHR31 Grand Master

JonnoHR31

Posted
Posted
I found Simons power curve was alittle odd, I've seen few other members running it on RB20dets it seems to make more mid range but not as much top end. But none of them actually run that much boost either.

Also the comparison dynosheet shown against GT3076s, Those 2x cars got lot more modifications then what my test car has. I believe I have no issues beating them in response, power and torque if I decide to modify mine in the same manner. Except I don't expect any one who uses my turbos to have all those mods.

if you have nothing to hide then post boost graphs for all 3, should reveal whats really going on....

good result simon, where did you get it tuned?

Lithium Grand Master

Lithium

Posted
Posted
Sigh... Thats not really a useful comparison. You can clearly see the GT3076 setup has notable issues.

Thats overlayed with my dyno plot by the looks of it, my coils completely failed not long afterwards and I have a set of Splitfires in there now - but thats probably more to do with the wavy line than the huge difference in torque once full boost is reached. My car was running a reasonably stable 16-17psi boost curve on the GT3076R, that other car is blatently running more boost.

I can't provide a boost plot for my dyno "curve" he used there, so he won't be able to - but as much as there were "issues" with mine they wouldn't be anywhere near enough to cause that torque difference once his reaches full boost. To me that overlay looks like a GT30R running a normal boost curve overlayed with a laggier turbo running more boost but for some reason (running out of flow?) boost drops in the high end so its making barely any more power than the GT30R.

A copy of the dyno plot and a boost curve on the same page for that setup to prove its staying under 17psi all the way would prove otherwise, but until then it doesn't look too good.

Also the comparison dynosheet shown against GT3076s, Those 2x cars got lot more modifications then what my test car has. I believe I have no issues beating them in response, power and torque if I decide to modify mine in the same manner. Except I don't expect any one who uses my turbos to have all those mods.

What a load of crap. My car is running a Chinese intercooler, a bone stock (high km) RB25, an internally gated GT3076R and all stock manifolds. The only thing I can see any hint of being better on my car is the turbo...

You are right, you'd beat mine in power/torque going by that plot but you are clearly running measureably more boost through it through the midrange - and I am very doubtful of keeping up in terms of response given it can't even spool as well against a dyno. If mine was running the boost it looks like you're pushing through that thing (and didn't have dying coils), the plot you provided quite possibly wouldn't be in the game.

I seriously dislike seeing dealers try to pull the wool over people's eyes to make their product look better than others by using compromised or not-really-comparable setups as legit comparisons.

Lithium Grand Master

Lithium

Posted
Posted

PS, the other GT3076R dyno plot which is lower than my "red" line and the ATR43G3 turbo looks like it'd actually deal to both of us if it was run on a Dynapack - again, very misleading graph to show

juggernaut1 Proficient

juggernaut1

Posted
Posted (edited)
good result simon, where did you get it tuned?

Judging by the dyno....looks like Sean at Allstar Garage.

FWIW my car is booked in to be tuned on this same dyno next week (SR with twin scroll 3076 - 52 trim) BP98 tune.

Edited by juggernaut1
SimonR32 Grand Master

SimonR32

Posted
  • Author
Posted
Judging by the dyno....looks like Sean at Allstar Garage.

FWIW my car is booked in to be tuned on this same dyno next week (SR with twin scroll 3076 - 52 trim) BP98 tune.

Yeah Sean from Allstar :D

Took it for a drive last night, starts peeling out when it comes on boost in 3rd gear!

SimonR32 Grand Master

SimonR32

Posted
  • Author
Posted
Do you know what sort of injector duty the 750's are getting up to with the fuel blend simon?

Unfortunately not, we unhooked the car from the dyno and put wheels back on and then all thought the same question but had forgotten to look...

Will hook up a laptop when I get a chance and run some data logging to have a look :D

hypergear Grand Master

hypergear

Posted
Posted

Lithum:

First of all the comparison graph was made by a customer not my self, might not be very accountable as its on a different dyno and different car perhaps I shouldn't put it in here. How ever yours is still the most responsive GT3076R in .82 with pump fuel in the Dynosheet section.

The stronger mid rang might been more boost by I haven't seen your boost curve yet.

I believe even at same boost curve this specific version of ATR43G3 is very likely to beat you in power and torque because its not using a standard size Garrett wheel. which I believe yours is a 76mm 56T 12 blade.

I've built and rebuilt plenty of GT3076s and I know how they behaves on RB25dets. on road this one delivers a noticeable stronger punch but not as smooth. I can modify GT307x to do the same or modify the ATR43G3 to match what you've got.

Plus you should mention that you are running a special valve for response increasement. Without it yours is just ordinary.

http://www.skylinesaustralia.com/forums/po...181-loadimg.JPG

Please post all your reply in my development thread. I didn’t meant or expect to hijack this thread. Thanks

Rolls Grand Master

Rolls

Posted
Posted

Looks horribly laggy, even on a dyno it isn't hitting full boost until 5000rpm, what is it like on the road in 1st and 2nd, nothing nothing then it just smashes the limiter getting no traction?

Still it is a fair effort for the 20, would be good for burnouts and drags, don't reckon it'd go too well on the track though.

SimonR32 Grand Master

SimonR32

Posted
  • Author
Posted
Looks horribly laggy, even on a dyno it isn't hitting full boost until 5000rpm, what is it like on the road in 1st and 2nd, nothing nothing then it just smashes the limiter getting no traction?

Still it is a fair effort for the 20, would be good for burnouts and drags, don't reckon it'd go too well on the track though.

Full boost is about 4700rpm in 4th...

Starts to move at 4000 and giddys up by 4500!

Been on to a motorkana already, it's fine apart from really tight stuff (helps with good suspension, dont have to slow down as much :cool: )

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