Anyone -7 Or -9 An Rb28?

[mr skidz]

Out of pure curiosity has anyone used the smaller -7 or -9 (GT-SS) on a RB28?

If so I would love to see any dyno sheet to see how the first half of the rev range looks.

I've been through the Dyno Thread and can't recall anyone ever using that combo.

[Hadouken]

Yay I want to know this!

[Anfanee]

I'm currently rebuilding, throw 3k my way and ill throw the stroker kit in.....

[mr skidz]

similar to a Z-TUNE setup

[Hadouken]

Looking at Petes direct comparo. (That was with -5's)

In theory -9's would drop off around 6.5-7k and probably churn 350/360kw on e85 @25psi....

Or am I way off?

[mr skidz]

I reckon -9's would punch nice and early pulling right out to 8500 rpm with no dramas and longevity would be good considering power would obviously be governed by the 9's

[Hadouken]

If they can hold out to 8k on a 2.8 then that would be awesome.

Hope someone has done this.

[mr skidz]

I noticed ages ago when the Garrett mobile app WAS working as latest update f**ked up my phone.

I'd switch scenarios like different Power limits and rpm's and I noticed the - 9's were occasionally recommended to me over everything else. when I asked for about 650bhp max (from memory) at the fly with a limit of 8500rpm as it seems there's a narrow window in the 9's compressor map that allows for higher pressures in the later rpm's that fit the 2.8 nicely.

anyone else spot this out

Edited August 25, 2015 by mr skidz

[mr skidz]

Looking at Petes direct comparo. (That was with -5's)

In theory -9's would drop off around 6.5-7k and probably churn 350/360kw on e85 @25psi....

Or am I way off?

and considering people with RB28 -5 combos are shifting early anyway so in most cases not utilising the last few RPM in most road use.

now imagine a - 9 set up in the 1500 to

4000 RPMs and would look fatter than -5s

in that lower rpm range.

throttle response would be sick on E85

[GH05T]

it would definatly be very street friendly.

Edited August 25, 2015 by GH05T

[mr skidz]

I imagine the power limit would be similar to a - 5 setup on a 2.6 but very different cars to drive in the real world

[Hadouken]

Hmmmm. I'm very much intrigued. If only I had a stroker sitting around.

[Piggaz]

PM Blitz.

He did it.

[mr skidz]

Wonder if he posted his dyno up

[Piggaz]

Pm me your number. I found it on my laptop but can't upload it for whatever reason. I'll SMS it

[mr skidz]

Pm Sent, thanks mate very interested in seeing

[Hadouken]

Upload it

[gtr jet]

The limit would still be around the 350kw mark wouldn't it? It's not like the extra cubes will give you that much extra power.

Mid range would be insane though.

[Hadouken]

I'm curious about midrange!

[Anfanee]

I can post a dyno graph of my E85 -7's for comparison soon also if wanted.