Please Help Me With My Very Lazy Gt2860-9's!

[tommis85]

with all the new turbos ( i.e: bilelt technology) arent the -9 outdated in the way that you can get the same response but with better power?

What you're referring to there is just a type of material production process. I think you may be referring to newer materials / machining processes in todays turbos?

I was under the impression that the -9's weren't too bad in that area.

Mine may be laggy at the mo....but there are some graphs on here that are pure porn!

[tommis85]

But unfortunately I have a rear and front diff to fix before I can resume with the turbos...although I was thinking of maybe getting the rear fixed first and then getting it tuned in RWD.

[MrStabby]

Did it go to the cat or get sucked back in?

Nope :-)

What you're referring to there is just a type of material production process.

Agreed. My guess is machining wheels from billet is just a low volume production method, so would be good for prototyping. discopotato would know....

[tommis85]

I should start a "get tom's GTR up and running" charity fund on here

[sydking]

Show an example

Have you installed your turbos yet sydking?

Been a little delay, They should be on by now just waiting on a fair bit of fabrication to be done, couple weeks then its tune time

[Moodles2]

To answer the question about -9's being outdated. Garret -5, -7, -9, -10 all use exhaust wheels cast from Inconel (mix of nickel steel etc). To get better response from these same turbos, titanium aluminide could be used to save about 30% weight vs inconel. The Garrett GTX range use steel billet wheels, they should be stronger (vs the casting process) and have better flow (updated wheel design) but billet steel doesn't do much for weight, they may even weigh more than the old Inconel wheels.

[scotty nm35]

The billet wheel is the compressor on the GTX range, it is made from an alloy billet. They use the same cast Inconel turbine as the rest of the range.

[cobrAA]

To answer the question about -9's being outdated. Garret -5, -7, -9, -10 all use exhaust wheels cast from Inconel (mix of nickel steel etc). To get better response from these same turbos, titanium aluminide could be used to save about 30% weight vs inconel. The Garrett GTX range use steel billet wheels, they should be stronger (vs the casting process) and have better flow (updated wheel design) but billet steel doesn't do much for weight, they may even weigh more than the old Inconel wheels.

exactly what I was refering too, if it they flow better by 10-15% ( garret's figure), this should result in better perofrmance no?

BTW, I own myself a pair of -9 just wondering if 3 years later, theres not better turbos out there ( lots of talk about precision turbo beeing as responsive as twin but with power of single)

[tommis85]

exactly what I was refering too, if it they flow better by 10-15% ( garret's figure), this should result in better perofrmance no?

BTW, I own myself a pair of -9 just wondering if 3 years later, theres not better turbos out there ( lots of talk about precision turbo beeing as responsive as twin but with power of single)

Hey Cobra, would you mind sharing how you went with your -9's? Mine are looking much more promising now, lighting the rears up in 2nd and 3rd so am very keen on getting my front diff back up and running and a retune!

At what RPMs would you be making say, 1 bar and fullboost?

[R.3.2.G.T.R]

Hey Cobra, would you mind sharing how you went with your -9's? Mine are looking much more promising now, lighting the rears up in 2nd and 3rd so am very keen on getting my front diff back up and running and a retune!

At what RPMs would you be making say, 1 bar and fullboost?

curious what tyres u running? I can't get my rears to light up unless I rev and launch, but not 2nd n 3rd

[tommis85]

Well it is just RWD now with front drive shaft disconnected because of buggered diff. The tyres are near new Federals, 255 45's with just 30psi in them to give it a bit of a better contact patch while it's just RWD and can't shift power anywhere.

Yeh this is just around 4000-4500 when the turbos really ramp up hard. Realy want my front diff going again so that I can feel all of the power not just up to where it breaks traction. It was quite a mess when I had 35psi in the tires - it hardly put any down.

[tommis85]

Also, mine will only do it in 2nd and 3rd....the tune is not good enough to make it do it in 1st with just a normal non stalled up / spiked launch. My R33 N1's were the same....1st was only there for one reason and that's to get the car into 2nd

[tommis85]

....unless you bought the turbos up to speed with a rolling start at about 3000rpm and then launched it, then it went stupid in all gears except 4th and 5th....although 4th was a bit on edge especially on bumps or crests..

[XKLABA]

Hey Cobra, would you mind sharing how you went with your -9's? Mine are looking much more promising now, lighting the rears up in 2nd and 3rd so am very keen on getting my front diff back up and running and a retune!

At what RPMs would you be making say, 1 bar and fullboost?

does this mean you have figured out fixing the rear diff or just going to get the front done and do back later

if you still have no love from the -9s you could try getting the rear housings off your stock turbos machined to fit the -9s, that would improve response just kill top end a bit

Also, mine will only do it in 2nd and 3rd....the tune is not good enough to make it do it in 1st with just a normal non stalled up / spiked launch. My R33 N1's were the same....1st was only there for one reason and that's to get the car into 2nd

LOL, so true

[tommis85]

Um nah the rear one is still worn but I let the tyres down and made sure both sides are very even. Keeps it straight for longer lol.

Yeh I'll be fixing the front diff first and then sorting out what to do with the rear.

Yeh you do make a good point there...I reckon once you've been through a heap of turbos you'll know exactly what you want and could make up a hybrid setup. But I would like to give these -9's one last chance with re-tune at Godzilla. If I still don't like the feel after that I'll probably strip the gear off and focus on more important matters in life ;-) 8 years worth of blowing money on Skylines is starting to get to me

[tommis85]

But one thing is already very apparant and that is, sure enough they may be quite laggy in the city (at this stage) but when you're out on the open roads they can really hawl some ass. Quite impressive how they'll pull in 3rd and 4th....a LOT better than what my ceramics were capable off.

...hopefully with a re-tune I'll get a good average between the past ceramics performance and the current mid-to-topend performance of the 9's.

[XKLABA]

get them to dial in cam gears for response, I sent you some settings awhile back, that would be a good starting point for alround use with stock cams

I've been spending money on these things for over 10 years now, but would much prefer spending money on these then drugs, smokes or alcohol, and when attending events like texi, its something I can do with my son when he is old enough

[tommis85]

get them to dial in cam gears for response, I sent you some settings awhile back, that would be a good starting point for alround use with stock cams

I've been spending money on these things for over 10 years now, but would much prefer spending money on these then drugs, smokes or alcohol, and when attending events like texi, its something I can do with my son when he is old enough

You and your words of wisdom Yeh I'll be running those degree settings past him and see what he can do.

Well from what I've seen you've had some pretty impressive results too...especially those with your ceramics that's not a bad effort. I think the most that I ever made with my ceramics was like 354hp and then 375hp with the 33 N1's.

[tommis85]

I remember how 4 years ago I was looking at -7's lol....and then I strayed off the beaten track and tried out all these other setups

[cobrAA]

I managed to make 520whp with poncam and gt-ss at 18psi. anyone who say that gtss are not worth it, change your tuner or re-do your setup lol.