Gt2860r -7 Or -5 Response

[32vspecII]

hi ive read the rb26 turbo upgrade section and ive settled on 1 of these turbos

i really want a quickish street car with the occasional motorsport/drag event . say 300awkw . more is good if its not at the expensive of lots of lag . im looking for something drivable .

obviously the -7 with .42 comp should be best but a few people have mentioned it comes on boost very severely with the -5 having a much smoother progressive power delivery which might be better for a daily driver

if anyone could shed any light on exactly when and how these turbos would come on boost it would be appreciated.

[ferni]

I always get mixed up between the 3 trims, -10, -7 and -5.

One of them is like the HKS GTSS, and will be the one you are after, will get you around 300kw at the wheels, very responsive. the next one up is a bit smaller than the 2530's, and will get you around 340kw at the wheels, still very drivable, probbaly a touch more lag if you can call it that. the next one up i don't know much about.

A smaller turbo normally comes on boost more progressively and smoother, doesn't feel as fast because it doesn't give you as much of a kick in the back.

[Ronin 09]

Correct me if I'm wrong, but the -5 is the 2530 size and -7 is the GT-SS size

[32vspecII]

GT2860R Turbo spec's (please choose -5 or -7)

GT2860 Turbine (-5) (Similar to the HKS GT2530) :

-Wheel: 53.85mm w/ 76 trim

-Housing: .64 or 0.86 ar (with wastegate divider)

GT28 Compressor:

-Wheel: 47.2mm inducer, 60mm exducer w/ 62 trim

-Housing: .60 ar

______________________________________________________

GT2860 Turbine (-7 similar to the R34 Nismo N1 Spec or HKS GTSS):

-Wheel: 53.85mm w/ 62 trim

-Housing: .64 (with wastegate divider)

GT28 Compressor:

-Wheel: 44.5mm inducer, 60mm w/ 55 trim

-Housing: .42 ar (not much smaller then 0.60 AR on the -5)

also i belive things like exhaust manifolds and cam gears will help make boost earlier ?

when would these turbos actually make full boost ?

[700HP-GTR33]

hello,

-5's with Poncams,Dumps and Computer will get you your figures you are after.

Full boost on mine, without poncams come in at 4500RPM.

You wont get those figures with the ss(-9 )or n1(-7) unless you do some engine work.

The gt-rs(-10)_ for Rb26 will have to much lag for day to day driving.

Hope I have been of some help.

Cheers

Tekin

[32vspecII]

will cams make it come on boost later but have more top end ? or will the low end be the same ?

[700HP-GTR33]

will cams make it come on boost later but have more top end ? or will the low end be the same ?

With the Poncams 260Degree with 9.15mm Lift responce is better through the low,mid and high ranges.

Boost comes in earlier around 4300RPM with the set up I have mentioned.

Other cams give you high end power figures only..Some mods to spring,retainers and even higher head gasket are needed with higher lift cams.This is not cheap, check out some pricing and you will see.

These cams are only good for top end power delivery,mid range is slightly higher than factory units

Poncams also work with standard computer,,,so in Melbourne if you get busted with a Powerfc,

there is no problem installing your old computer back.Poncams are a bolt on and off you go unit.

But getting back to the original topic.............if you are just after some useable power gains.

Buy the -7 or -9 Turbo's get some dumps, throw in the Poncams and you can be expecting to get

280AW kw's with a good tune(even a standard computer)at 1.3Bar.

If after all this you want a little more power, then the N1's or ss Turbo's will not take you there.

(Unless you spend a bucket-load on the engine.)

So the choice for me was obvious, I bought the -5's.

These will see me to 310AWkw's

[700HP-GTR33]

Correct me if I'm wrong, but the -5 is the 2530 size and -7 is the GT-SS size

Yeah your wrong.

This is why I have a Warn,10% under my name.

Tuneagent listed them as you have stated Ronin 09.

How do you get that warning off?

When do I get my 12 points back

[png godzilla]

Arkon,

i have the -10's fitted to my R32 GTR & got the HKS actuators as the -10's don't come with actuators.

i have plenty of bolt on mods but no cams or anything as yet. i got these turbo's because i have another engine & can put up with the Lag untill i put stage 2 in.

basically the -10 won't hit more than 0.5bar untill 5000 RPM, but when they come on, boy do they come on, 1.2, 1.3, whatever the're set to in an instant!!

I like em, big plans ahead!!

here's the mods at present with the -10's (laggy as hell)

Tommei S/S Extractors

Twin Garrett GT2860R (707160-10)0.6/0.64A/R (450hp models)

HKS Actuators

HKS Dump Pipes

HKS Front Pipe

Cat removed & 3” full back

Splitfire coils

NGK HITOP Iridium Plugs

APEXI FC & Hand Controller

600x300x125 FMIC (cut the front out to match the IC/8” Ducted air tubes to POD filters)

APEXI POD intake

NISMO FUEL PUMP

Nismo Adjustable Fuel Pressure Regulator

SARD 720cc injectors (not yet installed)

Water/Methanol Injection

Wide band A/F meter

HKS Twin Plate Clutch

PAR Racing Products Gear Set, straight cut 1st, 2nd & 3rd Helical 4th & 5th, Beefed up Synchro shift.

Greaddy Prfec B Spec II Boost controller

Apexi RSM Speed Limiter cut & G Sensor

[bnr#@]

Arkon,

i have the -10's fitted to my R32 GTR & got the HKS actuators as the -10's don't come with actuators.

i have plenty of bolt on mods but no cams or anything as yet. i got these turbo's because i have another engine & can put up with the Lag untill i put stage 2 in.

basically the -10 won't hit more than 0.5bar untill 5000 RPM, but when they come on, boy do they come on, 1.2, 1.3, whatever the're set to in an instant!!

I like em, big plans ahead!!

here's the mods at present with the -10's (laggy as hell)

Tommei S/S Extractors

Twin Garrett GT2860R (707160-10)0.6/0.64A/R (450hp models)

HKS Actuators

HKS Dump Pipes

HKS Front Pipe

Cat removed & 3” full back

Splitfire coils

NGK HITOP Iridium Plugs

APEXI FC & Hand Controller

600x300x125 FMIC (cut the front out to match the IC/8” Ducted air tubes to POD filters)

APEXI POD intake

NISMO FUEL PUMP

Nismo Adjustable Fuel Pressure Regulator

SARD 720cc injectors (not yet installed)

Water/Methanol Injection

Wide band A/F meter

HKS Twin Plate Clutch

PAR Racing Products Gear Set, straight cut 1st, 2nd & 3rd Helical 4th & 5th, Beefed up Synchro shift.

Greaddy Prfec B Spec II Boost controller

Apexi RSM Speed Limiter cut & G Sensor

edited

Edited October 4, 2006 by bnr#@

[joeleo87]

Im sorry to pull up an old thread but....

im in the process of buying a set of either -5 or -7s (for some reason they are the same price??? so it warrants some research)

basically im buying the new turbos because Ive just joined the "ZOMG there goes my rear turbo" club.

so im running stk everything but a cat back exhaust.

eventually ill get another ECU, dumps, front pipe and search for about 300kws.

my question is, what turbos will be more responsive with minimum mods? -5 -7? also what will suit my 300kw application better?

cheers

[TiTAN]

GT2860 -7 Turbine (similar to the R34 Nismo N1 Spec or HKS GTSS) will get you 300kw and be responsive. the -5's are a bigger turbo and will as such be more laggy.

[R31Nismoid]

-7's... the same answer for everyone after 300-330rwkw

[rev210]

-9's are also now an option. They are the closest match to the GT-SS. The compressor map is very nice indeed. Has the very close efficiency island at the 30+ airflow to the -5's , where the -7's are going to be pumping that sort of air with alot more heat. They appear to be a newer style? With the best of both worlds for those wanting to make the airflow over 250rwkw + with less effort than the -7's.

[some_cs_student]

So, just commenting on the above post, the -9's are more responsive than a -7 but less overall power?

Any idea how much power is normal for a -9?

[GTR1993]

-9's are also now an option. They are the closest match to the GT-SS. The compressor map is very nice indeed. Has the very close efficiency island at the 30+ airflow to the -5's , where the -7's are going to be pumping that sort of air with alot more heat. They appear to be a newer style? With the best of both worlds for those wanting to make the airflow over 250rwkw + with less effort than the -7's.

With these -9s ( i have searched and have seen disco talking about them alot) and the HKS GT SS turbos will they reach 350 rwkw? I'm trying to build an awesome responsive std stroke 26, paying particular attention to getting the exhaust and inlet flow in the head right up (mostly exhaust as they are quite poor standard). My aim is 350 rwkw and i want to be able to make this on pump all day. I have all the parts just not the turbos and oversized valves at the moment.

Cheers

[rev210]

The -9's will get the 350rwkw is my bet.

[Tomek]

-7's are the most responsive out of them models. Garrett equivalent of the HKS GT-SS turbine, good for up to 350rwkw.

Speaking of which I got a set for sale, in spanking condition

[GTR1993]

-7's are the most responsive out of them models. Garrett equivalent of the HKS GT-SS turbine, good for up to 350rwkw.

Speaking of which I got a set for sale, in spanking condition

the garrett -9 is actually the HKS GT SS equivalent, its the actual same turbo as the gt ss, the garrett and hks cartridge numbers are actually the same.

[Bakes]

You can buy the HKS GTSS kit that comes with everything you need.

If you buy the Garrett Turbos, how much would it cost to buy all the other stuff seperately like gaskets, hoses, etc, etc that comes included with the HKS kit??? Anyone know??

ie: How much cheaper is it to buy Garretts and the other stuff needed vs buying the complete HKS kit?

Ive seen the HKS GTSS complete kit for ~3K - 3.4K.

Ive seen -7's for ~ 2.5K for two.