Gt2860r - 5 Vs Gt2860r- 7

[DVSGOD]

Hey guys.

Just wondering if anyone is running either of these garrett turbos on there gtrs?

How do they perform ?

Does the larger GT2860R- 7s have issues with shuffle down low and how responsive are they? e.g when do they start pulling from and when do they get onto full boost ,say 1.4 - 1.6 bar.

Here is where im at,I have an engine thats built for a solid 700hp with fueling to match,running power fc as my computor.

My goal is high 300kws or even low 400kws at the hubs (hub dyno) would these turbos do this?Iv read that the GT2860R - 5s are good for 360hp apeice with almost factory response in spool rate and the GT2860R- 7s are rated to 400hp each , now thats on paper but what are you guys getting with these tubbies? A single is not an option for me at this stage and I want to keep with bolt on low mounts.

Any help will be greatly apreciated

[steve_gts4]

the -7 is smaller than the -5...

i have -7 in my gtr, but the motor blew when i was getting it tuned, so i dont have any final results yet!

[The Dan]

The 707160-5 in a pair combination is good for 700hp at all fours as proven to me on a dyno. Brisbane tuning and turbo centre.

The -7 will come one boost slightly earlier and sharper. The -5 has a smooth deceptive power curve.

The -7 is basically just the N1 whereas the -5 is an upgrade to that turbo. People who I have sold these -5's to have been wrapped in their performance. Most of whom had come from such turbos as the -7 already.

[DoughBoy]

Getting 700awhp on those turbos is quite an achievement, that's really fantastic. Is that on a street or race car?

[R31Nismoid]

500rwkw

[sky30]

What RPM do each of the 2 types make full boost??

[markk]

I've got -5's in my GTR. They start spooling at around 2500rpm and are at full boost (18psi) at around 5500rpm. These turbo's are excellent !

[tk80]

The 707160-5 in a pair combination is good for 700hp at all fours as proven to me on a dyno. Brisbane tuning and turbo centre.

would love to know what else is done to this car....because that figure sounds a bit too high for those turbos. they're only rated at 350hp so how you can get 700awhp out of them would make for an interesting read.

[djr81]

Garrett publish the compressor & turbine maps for these things (as with most of their product). Have a look at www.turbobygarrett.com under the part numbers. You can quite reasonably relate airflow to engine hp. This is actually what people are dong when the quote a 350hp turbo or whatever. Anyway, have a look.

[Mr. Keets]

"The 707160-5 in a pair combination is good for 700hp at all fours as proven to me on a dyno. Brisbane tuning and turbo centre....People who I have sold these -5's to have been wrapped in their performance."

3li3 32

I'm guessing these -5s are on RB26, 700 @ all 4 WOW; what are the specs??? I thought somewhere around the mid to low 500s at the wheels was about it.

DVSGOD

I have -5s on my 89 R and they are great, they really start pulling hard at around 4K. I'm making 412rwhp on an internally standard combo...an excellent purchase

[DVSGOD]

Cheers for your replys guys

And as Steve _gts4 has rightfully pointed out the -5 is in fact the bigger of the two

I got my info from here http://www.turbos.co.nz/garretttake2.html but it seems they have the write up on each one round the wrong way

Edited August 2, 2006 by DVSGOD