-7/9s Or -5s Garretts

[Piggaz]

GCG are wrong. -9's are bigger.

[wedge_r34gtr]

GCG are wrong. -9's are bigger.

Yep, Paul is correct

[hazjaz]

Wow, this got confusing. So I searched garrett official website to get the measurements of a GT2860-9 and it turns out the GT2860-7 that GCG apparently have are the same measurements as listed GT2860-9 on the garrett website.. I don't know how that works but numbers shouldn't lie.. Right?

Edit:

The gcg -7 are the following:

Inductor- 47.2

Exductor- 60.1

That sounds like a -9 ?

Edited April 11, 2013 by hazjaz

[hazjaz]

delete me!

[hazjaz]

Sorry guys, it wont let me edit the above post.

After a few more hours of reading through threads on this forum I have come to the realisation that the -7s are GT2860-7 (707160-7) and the -9s are GT2859R-9 (707160-9). Going off the stats on the Garrett website, the -7 is a bigger turbo? In that case why is the -9 the one with the better performance and able to push more power easier?

GT2860-7 (707160-7)

COMPRESSOR

Ind Whl Dia(mm) - 44.60

Exd Whl Dia(mm) - 60.10

Trim - 55

A/R - 0.42

TURBO

Whl Dia(mm) - 53.90

Trim - 62

A/R - 0.64

GT2859R-9 (707160-9)

COMPRESSOR

Ind Whl Dia(mm) - 44.50

Exd Whl Dia(mm) - 59.40

Trim - 56

A/R - 0.42

TURBO

Whl Dia(mm) -53.90

Trim - 62

A/R - 0.64

If anyone can clear this up for me that would be great, based on the read I have done -9 is the ones I want, but turns out they are actually smaller.. In which case -7 would have more potential?

Edited April 12, 2013 by hazjaz

[wolverine]

http://www.skylinesaustralia.com/forums/topic/423175-r34-gtr-turbo-upgrade-needing-advice/#entry6811557

I know this will seem like you are going around in circles but the information has been given to you in a user friendly way.

The flow potential of the -9 is higher than the -7.

[Marko R1]

This is pretty much gospel:

-7s 300kw

-9s 330kw

-5s 360kw+

I am very surprised with the info GCG gave u...

[Piggaz]

It really is this simple;

After 'response' on a 2.6 = -9 (330 rwkw or so or squeeze 350 + on E85 on a 'normal' setup) *350 plus on 98

If you can put up with a lethargic result for more top end (360-380) on a 2.6 = -5's.

Stroker = -5's

3.0 with a bulldog curve = -5's

-10's/RS's = in the bin.

*Well setup cars are the exception.

[Marko R1]

Haha bulldog curve, is this your new quote paul

-10s in the bin looool

[hazjaz]

Thanks for the reply guys. I will be going for the -9s. I'm sure if I quote the model number and ask for the HKS GTSS equivalent I will be getting the right ones.

-7s seem a bit out of a waste of time unless you're chasing a replacement

Edited April 12, 2013 by hazjaz

[hazjaz]

Sorry guys, no edit button again for the above post. But after reading about the different sizes listed by garrett I went into the technical drawings and they look identical apart from the turbo outlet. Is the design of this the advantage of the -9s? Picking up the turbos tomorrow so just want to make sure 100% that I am buying the right ones.

-7

http://www.turbobygarrett.com/turbobygarrett/sites/default/files/default_images/turbogroup/drawing/Garrett_GT2860R_707160_7_new.pdf

-9

http://www.turbobygarrett.com/turbobygarrett/sites/default/files/default_images/turbogroup/drawing/Garrett_GT2859R_707160_9_780371_1_new.pdf

[Piggaz]

-9's. Done.

[hazjaz]

Is there only one -9 from garrett that is an RB direct bolt on?

[Piggaz]

Is there only one -9 from garrett that is an RB direct bolt on?

Yes.

[MrStabby]

This is pretty much gospel:

-7s 300kw

-9s 330kw

-5s 360kw+

More like:

-7s 320kw

-9s 330kw

-5s 360kw+

[Marko R1]

^ really? I had no idea -7s are that close to -9s

[levinboy]

More like:

-7s 320kw

-9s 350kw

-5s 360kw+

Now fixed

[(OO)SKYLINE(OO)]

http://www.skylinesaustralia.com/forums/topic/423175-r34-gtr-turbo-upgrade-needing-advice/#entry6811557

I know this will seem like you are going around in circles but the information has been given to you in a user friendly way.

The flow potential of the -9 is higher than the -7.

That's right!

-7's and -9's have the same size in specs.

From memory when speaking to Racepace, the reason why the -9's have better top end is due to the configuration of the turbine blades.

Ones longer and the other shorter (the shorter blade allowing more air to flow through).

Also to do with the pitch angle of the turbine blades.

It's at a certain degree to allow more air.

[vspecIInur]

Hmm maybe if I go -9's from N1's I can get my 400kw

[Piggaz]

^^ isn't worth the effort IMO.