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-7/9s Or -5s Garretts


Adz2332

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did u keep your -10's on your sperm whale paul or did u switch to -5's?

The sperm whale is still powered by RS's :spank: BUT I have bought a set of 5's to go on. Who can say no to 1000 RPM less to get to fullboost?
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The sperm whale is still powered by RS's :spank: BUT I have bought a set of 5's to go on. Who can say no to 1000 RPM less to get to fullboost?

will you get full boost at the same revs as my rb30? should be similar right?

-5's on rb28

-10's on rb30

...will be interesting!

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It shall be. With nice and small cams (maybe the mines 252's @ 10.05mm) and 'tickled' -5's. Should be alot better than the choo choo choO chOO cH00 CH00 CHOOF CHOOF CHOOF I have now!

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It shall be. With nice and small cams (maybe the mines 252's @ 10.05mm) and 'tickled' -5's. Should be alot better than the choo choo choO chOO cH00 CH00 CHOOF CHOOF CHOOF I have now!

did you ever try running that baffled twin turbo pipe i bought off you? im sure u said no at the time due to the hard pipe kit, you're more than welcome to try it though if u like :)

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Your setup should come on boost sooner than mine paul as I had 280 degree cams with 10.8mm lift. My -5s I had on my rb26 was quite responsive, not like my -10s on rb30, but really not far off at all.

You will be happy if that is what you're chasing

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did you ever try running that baffled twin turbo pipe i bought off you? im sure u said no at the time due to the hard pipe kit, you're more than welcome to try it though if u like :)

It came off my car that night!!!! Lol. It was on my car for years.

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did you ever try running that baffled twin turbo pipe i bought off you? im sure u said no at the time due to the hard pipe kit, you're more than welcome to try it though if u like :)

It came off my car that night!!!! Lol. It was on my car for years.

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It was an improvement yes. Either way the debate of 5's and RS's/10's has been had many times. Gav's result sums it up perfectly.

Anyway, back on topic.... SS's and -9's wasn't it :D

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  • 6 months later...

why are there so many dyno sheets on here with -5 setups and under 350kw? actually most are around 315kw. from my understanding 350 can be reached with -9's and quicker then the other. Unless there is some sort of other advantage im overlooking?

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Would be interesting to see whats supporting mods people have used for a responsive -5 set up. I'm talking 3.5k and on song with 20psi. Even things like short gts4 gear ratios and lightend fly wheel matched with cam timing.

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  • 1 year later...

Sorry to be bumping this back up but it has been a very good read. I'm still confused.. Is there a GT2860-9? Or are they listed as a GT2859R-9?? I have been in contact with GCG and they were telling me that the -7 turbos are bigger and have a bigger inlet and will make me more power then the -9.. But this thread has told me other wise.. Please help lol

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