Gt2860r -7's, -9's & -5's

[discopotato03]

Anyone can read the specs at turbobygarrett but this may make it easier to see the differences . The 2530 specs are not there but thrown in anyway .

Turbo ...... CHRA ............. Turbine size/Trim .... Turbine housing A/R .......... Compressor size/inducer size/trim ......Compressor housing size A/R .

-9 ........ 446179-5065 ..... 53.8mm/62 Trim ...... GT25 0.64 A/R .................. 59.4 mm/44.5mm/56 Trim ................ T3 0.42 A/R .

-7 ........ 446179-5054 ..... 53.8mm/62 Trim ...... GT25 0.64 A/R .................. 60.0 mm/44.5mm/55 Trim ................ T3 0.42 A/R .

-5 ........ 446179-5051 ..... 53.8mm/76 Trim ...... GT25 0.64 A/R .................. 60.0 mm/47.2mm /62Trim ................ T4 0.60 A/R .

2530 ... 446179-5021 ..... 53.8mm/76 Trim ...... GT25 0.64 A/R .................. 60.0 mm/47.5mm/63 Trim ................ T4 0.60 A/R .

If you look at the dimensions the -7 and -9 are very similar as is the -5 and the GT2530 . What you can't see from these specs is the profile and tip hight of the compressor wheels , the major diameter and trim sizes don't tell you the whole story .

Also , ALL these 53.8mm GT turbines are know known as GT28 turbines and its the 53".0" mm ones that are the "GT25" ones .

The GT28 turbines are nine bladed although I'm not certain I think they are both NS111 series ones , definitely the 76T one is .

Also note the compressor housing family and size . The -5 and GT2530 are T4 sized and in 0.60 A/R . The -7 and -9 are down a series from T4 to T3 and the A/R ratio drops from 0.60 to 0.42 . From memory the std GTR GT28's used 0.42 A/R compressor housings didn't they ?

So IMO for the more responsive turbo I would choose -9's over -7's .

The differences are probably less between a -5 and a GT2530 though there's a greater chance of the pricing being very different . That would depend on the cartridge and compressor housing for the 2530 being available through Garrett .

If good all round street car boost response means something to you don't treat the larger 76 trim turbines and T4 compressor housings lightly in the -5 and GT2530 turbos . The larger trims and C hsgs are whats needed to get 600 odd horsepowers worth of air in and exhaust out of your RB26 . Its almost 235 hp/liter so you would not expect to be sunk into the seat a 2500 engine revs .

Now not everyone has a use for 600+ ponies or has the resources/will to fork out for the mods to suport it , this is where the -7 or preferably -9 turbos come in because they look to be a straight swap for the T28's and can probably be made to work on a bog std car if the user is not too greedy boost/rev wise .

I think you have to ask yourself seriously what you want from an RB26/GTR , personally I'd want the boost happening something up to 1000 revs sooner because if you really must have dices with others its that all import leap out of the blocks that gets you ahead .

They may flatten out sooner but that's what 2nd/3rd/4th and 5th gears are for . Less extreme driving and a longer life out of an expensive car .

Your calls , cheers A .

Edited March 2, 2010 by discopotato03

[paulr33]

thanks disco

updated sig accordingly

[bradsm87]

Factory airbox!!!

Why would you put on pod's when there is no need?

The cost saved of not using pods/adapters is the difference to get Nismo AFM's... and the cars performance is all the better due to the factory airbox and cold air vs pods without.

I was under the impression that R32 GTR airboxes aren't that great and the R33 and R34 ones are really good.

[R31Nismoid]

For -9's they are OK. 330rwkw isn't a problem with it.

380rwkw i think is questionable as the R34 airbox is different, has a side intake from the guard that is blocked and can be removed

[KrayzieGTR]

Hey Guys,

Quick update, just got the car back over the weekend after exactly 2years 4months and 24 days out of action. Initially the car was meant to have everything done as previous mentioned in this thread, but after speaking to my mechanic and not really having my list finalised we decided to just do all the things to get it back on the road. Pulley Kit (one of the tensioner bearings was way gone, hence why it was off the road for so long), New Belts, hoses, seals, compression and leak down tests, cleaned injectors, service etc...... and i must say WOW.... i have missed this car!!

I know that the fact i haven't driven it in a few years adds to the overall impression it made on me but how quick are these things standard?? it was such a thrill to just jump back in my stock standard car (or as close to stock as possible) and just have that much fun.

Anyways the good news is upgrades are still going ahead but no longer limited by a budget (kind of), my mission now is to suss out all the parts i will be changing and get them all together so that the next round of mods is quick and painless.

The final listing is as follows:-

- GT 2860 ..... -9's x 2

- Apex'i PFC with Controller

- Dual Stage Boost Controller

- 2 x Z32/Nismo AFM's (i dont think it will matter too much either way)

- Hi-Flowed/Ported Std Exh. Manifolds

- FMIC (my uncle won one and doesn't have a turbo car... long story) & Hard Pipes

- Adj. Cam Gears

- Nismo 550cc Injectors

- Turbo Back Exhaust 3" from cat back (already have)

- Spitfire Coil Packs

Its probably a little more than the minimum requirments for -9's but i want to also try to build some reliability into the engine.

Im hoping that this will give me the little extra power with out sacrificing response or engine safety.

I will be looking at purchasing these thing over the next few weeks/months, so if anyone has anything for sale please let me know. Otherwise thank heaps for all the input, i hope other people find this thread and other related ones on SAU as useful as i did.

Shop around is all i will say to that.

been looking around and still haven't found any.... -9's are harder to find than -7's. you might have to give me a hint???

Also 3" turbo back makes no sense

You have two turbos... and i highly doubt you have 2 x 3" dump's. You sure it's not cat-back?

Sorry my mistake.... it is a full turbo back system but its 3" from Cat back. Dump pipes keep the exh and wastegate air separate for longer.

Nismo 555/550's are direct fit. All Nismo injectors are direct fit, as with most jap injectors. Factory rail is good for over 400rwkw.

Factory injectors are 440cc

Thanks guys i'll deffinately be going down this path.

Hmmm one of those filter relocation kits would certainly be nice. I swear at the Nissan engineers everytime I remove my oil filter and it empties itself down the side of the block. Sorry, bit off topic, but is there any trick to change these filters without making a mess?

Tell me about it, i think all skyline owners have experienced this. The worst for me is when i first got the car and the oil filter was siezed up bigtime, it seriously took like 4 hours, multiple screw drivers and hammers to do an oil change. Do it enough times and you'll slowly develop your own way. I can do it now with great concentration and minimal spillage

For -9's they are OK. 330rwkw isn't a problem with it.

380rwkw i think is questionable as the R34 airbox is different, has a side intake from the guard that is blocked and can be removed

I heard awhile ago that the factory airboxes were pretty good. I remember one of the guys at JusJap offering me a full complete HKS pod kit for a straight swap with my factory box.... NO WAY MAN!! lol

Thanks again everyone. I look forward to keepiong everyone update on my progress and hopefully have a some pics, timeslips and dyno print outs soon enough.

Cheers

Kristian (KrayzieGTR)

[Brandon]

Are you still talking about the 32gtr? If so you might want to consider doing dumps at the same time when you're changing the turbos. I heard the 32gtr dumps arent as good as the brothers.

[KrayzieGTR]

yeah GTR R32.... i will definately be puttin on the dumpies when i do the turbo's. i already have a full turbo back system waiting under my bed!! lol

Cheers

[Brandon]

Very nice. Be sure to post some photos up when you get the time. Ta

[usmair]

any updates/results on how you went?

mine should be getting -9s and a PFC tune this week so post up the results.

not expecting anything super quick right now because everything else is standard