R33 GTR - upgrade advice needed

[MrSquigle]

Hi All.

I have tried searching and found huge amount of information, however looking for advice to narrow down my selection.

Starting out with a completely stock GTR R33, would like a well rounded package targeting 450hp at the wheels on pump 98 fuel. Appreciate any advice on bolt on twin turbo upgrade selection and any other supporting mods needed. Car is a street car, do not want to move to far away from the standard drive ability.

thanks in advance

[sneakey pete]

In before everyone says do single turbo.
Because seriously, do single turbo if you want to get that sort of power and maintain street driveability.

 

If you really, truly must maintain twins:

-9s

HPI dumps
plazmaman cooler

good injectors

good aftermarket ECU

headstuds/gaskets

This might just make your desired power on 98, might also not but they're smaller turbos so shouldn't hurt your driveability much. Would suggest you go for a ride in a car with -5's on 98 and determine if that meets your driveability criteria before considering that size turbo

 

[Dose Pipe Sutututu]

Do the twins, then a few years later upgrade to a single

Then you'll be like "why did I ever do the twins?" 

[MrSquigle]

Thanks for the reply's

not wanting to change the car to much, happy to leave it twin and standard looking. Are the Garrett GT2860r a decent upgrade from standard?

[Griffin]

I'm about to go single efr using stock manifolds with twin gates and a 'y' piece.  Sell the twins. 

[Piggaz]

20 minutes ago, MrSquigle said:

Thanks for the reply's

not wanting to change the car to much, happy to leave it twin and standard looking. Are the Garrett GT2860r a decent upgrade from standard?

 

Flick through this. Your question has been answered 11ty times.

 

[MrSquigle]

Can anyone explain the differences I could expect between Garrett -7 and -9 twins.

[r32-25t]

it’s beleived then -9 will make fractionally more power but they both respond the same 

[djvoodoo]

1 hour ago, r32-25t said:

it’s beleived then -9 will make fractionally more power but they both respond the same 

Speaking from actual experience. Changing from R34 N1's (-7) to GTSS (-9) there was a re-markedly big improvement in response.

The -9's were on sooner, harder and stayed on the boil for alot longer

[r32-25t]

Were the -7s stuffed? Cause I’ve driven both and couldn’t tell the difference 

[djvoodoo]

Were the -7s stuffed? Cause I’ve driven both and couldn’t tell the difference 

-7’s were perfectly fine. I was pleasantly surprised when I got the car back.

There are plenty of dyno read outs in the 26 thread and a lot of the 7’s get 20 psi closer to 4400rpm which is about what I was getting.

9’s were on 20 psi a good 500 rpm sooner .

-7s nosed over to 19psi by 7500 rpm.

9’s stay 21-22 psi all the way to 8000rpm

Same motor, exhaust, ecu etc

[r32-25t]

I’ll take your word on it but I’ve driven a lot of gtrs with both of these turbos and had a very different experience from you

[sneakey pete]

Its still fair to say if you were looking at both brand new you'd just get the 9s

 

[Dose Pipe Sutututu]

Whatever you do, don't try and jam GTX wheels into these turbos either.

A simple search shows how these owners all regret it.

[No Crust Racing]

If you want to do it on the cheap with minimal mods you can buy all second hand bits for a basic -9 upgrade but you will need to run reasonable boost to get to 450rwhp on 98. Other options are mild cams, say basic 260 tomei, but everyone complains about the drive ability afterwards as they have soft ramp rates or E85, which will get you there with less boost and lower EGTs. Fuel economy will suffer though, but you can always run a flex setup if it's a daily and run 98 for commuting and E85 for an extra 20kw for track days or whatever. 

You could also do a basic single conversion, not a kebab spec full twin scroll EFR setup, but just a basic new gen Garrett on a reasonable manifold, single gate.

If you want to stick with twins, I'd recommend -9s. -5s are too laggy for the street without a few accompanying mods, -7s run out of puff too early. My 2 cents

 

 

[Dose Pipe Sutututu]

If I had a GT-R and didn't want to spend stupid amounts of money to make it fast, I would do all the handling, suspension, braking, cooling mods first.

Then go thrash the living daylights out of it on the track.

Once I am ready, would drop in ARP headstuds, higher lift cams, and a big sexy single.