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joe89

GTX3076R GEN II VS GTX3576R GEN II on RB26

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Hi there.

Which will be better for street forged RB26? Botch turbo's are for 750[crank]hp - my power goal is 650-700hp on 93octane. GTX3076R will have 0.83 T3 twinscroll  and GTX3576R probably 0.61 T3 twinscroll. I hear GTX3576R spool better than -5. I need the fastest possible spool for that power level. Even i prefer 650hp over much lagged 700.

It's true GTX gen 2 spool faster than gen 1?

BTW how realistic is G25-660 with 650hp @ RB26?

 

 

Edited by joe89

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9 hours ago, joe89 said:

Which will be better for street forged RB26? Botch turbo's are for 750[crank]hp - 

3076 Maybe in Americaland but not in Australia

9 hours ago, joe89 said:

GTX3076R will have 0.83 T3 twinscroll

No, too small. 1.01 required. Also they don't do a T3 twinscroll as far as i am aware.

 

9 hours ago, joe89 said:

 GTX3576R probably 0.61 T3 twinscroll

See above

9 hours ago, joe89 said:

I hear GTX3576R spool better than -5. I need the fastest possible spool for that power level. 

Yes a 3576 should be much much better than -5

9 hours ago, joe89 said:

It's true GTX gen 2 spool faster than gen 1?

In my experience is much of a muchness

9 hours ago, joe89 said:

BTW how realistic is G25-660 with 650hp @ RB26?

Less likely than the 3576 doing it

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46 minutes ago, iruvyouskyrine said:

No, too small. 1.01 required. Also they don't do a T3 twinscroll as far as i am aware.

Not as a full complete kit, you need to buy the supercore and order the rear housing separately :)

I'm still waiting on my divided 1.01 T3 rear housing from Sparesbox, however I have a nice GTX3576R Gen 2 supercore at home.

20190214_075228.thumb.jpg.7cef5a333251d96e82a5ef869e69118b.jpg

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Oh wow, I've clearly missed some developments with the Dose Pipe beast - nice, be interesting to see how that goes!  Big hot side, any reason for going the 1.01 instead of the .83 housing?

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Wanted the car to be linear and not snap necks, although my mates have been telling me to go with the 0.83 TS housing.

Let's see, if I'm not overly impressed might have to drop it down a housing. But my gut feel (based loosely on pure broscience) tells me it will work out pretty well.

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5 minutes ago, Dose Pipe Sutututu said:

Wanted the car to be linear and not snap necks, although my mates have been telling me to go with the 0.83 TS housing.

Let's see, if I'm not overly impressed might have to drop it down a housing. But my gut feel (based loosely on pure broscience) tells me it will work out pretty well.

Should have got a 42r and left the 35 for the response losers lol

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1 minute ago, Dose Pipe Sutututu said:

Wanted the car to be linear and not snap necks, although my mates have been telling me to go with the 0.83 TS housing.

Let's see, if I'm not overly impressed might have to drop it down a housing. But my gut feel (based loosely on pure broscience) tells me it will work out pretty well.

Keen to hear how you find it.  I'd have gone with the .83 as well, but it will be a very interesting setup to see how works as it's going to be something a bit different :)

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19 minutes ago, WantGTR said:

Should have got a 42r and left the 35 for the response losers lol

Salem Habib, wallah don't be worried, I'm not gonna run a speed sensor on my turbo and send it :)

Race you soon bruh.

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20 minutes ago, Lithium said:

Keen to hear how you find it.  I'd have gone with the .83 as well, but it will be a very interesting setup to see how works as it's going to be something a bit different :)

I've been stalking the Evolution M forums, as well as some random Russian YouTube videos with the same turbo on Chasers albeit Gen 1.

Back to back from 0.83 to 1.01 there was a bee's dick difference in response however a bit more top end. 

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28 minutes ago, Dose Pipe Sutututu said:

I've been stalking the Evolution M forums, as well as some random Russian YouTube videos with the same turbo on Chasers albeit Gen 1.

Back to back from 0.83 to 1.01 there was a bee's dick difference in response however a bit more top end. 

Oh wow, I've missed that one - been following 240Z's experiments which have been pretty cool but I've not seen him try the .83.  In his testing the 1.01 GTX3576R was real laggy from memory, he went to a GTX3582R with the ATP T4 1.06 housing (which actually have a much smaller cross section than the Garrett T3 divided housings, so actually downsized despite the a/r)  and picked up spool.

Who did the .83 to 1.01 comparison?

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Noone did the comparison, but from amalgamating different results from various results it appears going to a larger housing (of course keeping it TS) people have lost not much boost respons vs. RPM however however tends not to nose over.

I saw those results from 240Z going from a 0.82 OS to a 1.06 TS and actually getting better response.

I got the whole GTX3576 idea from the Evolution and WRX guys, so hopefully once it's all running we can get some data.

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2 hours ago, Dose Pipe Sutututu said:

I saw those results from 240Z going from a 0.82 OS to a 1.06 TS and actually getting better response.

I got the whole GTX3576 idea from the Evolution and WRX guys, so hopefully once it's all running we can get some data.

Ahh yeah, that's one of those big cases where "a/r" is a bit of a flawed measurement as you kinda need the "area" value as well to get a real gauge of the scale being dealt with.  A 1.06a/r T4 twin scroll housing from ATP was pretty equivalent in effective size/flow to the .82a/r T3 Garrett open housing, but more efficient due to being a divided housing so despite being a bigger number - it wasn't much "bigger" in effect, if at all... but more efficient being divided so still flowed a bit more but also at no real cost to response.  Arguably better transient response, a mate did the same conversion (.82 T3 open GT35R to a 1.06 T4 divided one) and the thing felt much better on the road.

Garrett's T3 divided housings actually are much more "equivalent" to the open housings, so if you want the divided equivalent of a .82a/r T3 open housing then you get a .83a/r T3 divided housing - as opposed to going up an a/r like you would with some options. 

Basically the .83a/r Garrett T3 twin scroll housing is much more comparable to the ATP 1.06a/r T4 housings used in those comparisons than the 1.01 is - though realistically its a bit hard to compare.   One thing is for sure, you're not likely to choke your compressor :D

Anyway, I've been looking forward to seeing a GTX3576R on an RB25 and know you'll have done it well so very much look forward to seeing how it goes, kudos for trying some cool shit out :)    Hopefully the result ends up driving the way you want it to anyway, and it's worth knowing that if on the off chance the spool isn't as good as you were hoping - you can try going down a size in exhaust housing and are unlikely to lose too much up high.

 

 

Edited by Lithium

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25 minutes ago, Lithium said:

Anyway, I've been looking forward to seeing a GTX3576R on an RB25 and know you'll have done it well so very much look forward to seeing how it goes, kudos for trying some cool shit out :)    Hopefully the result ends up driving the way you want it to anyway, and it's worth knowing that if on the off chance the spool isn't as good as you were hoping - you can try going down a size in exhaust housing and are unlikely to lose too much up high.

That's the best part, just swap housing no fab work and off I go again :)

 

26 minutes ago, Lithium said:

A 1.06a/r T4 twin scroll housing from ATP was pretty equivalent in effective size/flow to the .82a/r T3 Garrett open housing, but more efficient due to being a divided housing so despite being a bigger number - it wasn't much "bigger" in effect, if at all

Interesting to know that, I never really looked deeper into the overall surface area and volume of the housings.

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26 minutes ago, Dose Pipe Sutututu said:

Interesting to know that, I never really looked deeper into the overall surface area and volume of the housings.

I kinda wish I made more measurements when I had one of the ATP ones in my hands, they're pretty unusual to come by these days.  

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