Rb28 Build

[khezz]

Good morning everyone.

I am about to embark on a build to make 450awkw. The car is a 1990 gtr.

The mod List so far:

Power fc D-Jetro

800cc Sard Injectors

Trust Drag intercooler

Custom intake piping

Custom Exhaust

A/M Turbos (Searching by the serial number they came up as a "Le-Mans" turbo 330-350hp each)

twin plate clutch

Hicas Gone

350awhp

The car developed a leak in the headgascket. it was still drivable but due to various family reasons, it has been garaged for about 4 years. I am now in the position to give it a lease on life and if after the build it sparks a fire under my ass, I will keep building it. if it doesn't then it should be very easy to sell once finished.

the plan:

2.8L stroker (want to keep the 86.5mm bore for strength reasons and leaning towards the Spool kit.)

270ish by 10.5ish cams on both sides

low mount roller bearinbg turbos

cure for the oil issues via a bigger sump

and if the gear box goes, an os 5 speed rebuild.

The question:

With so many strokers out there, is it really worth while spending the money on a top of the range kit or will a $5-$6k kit be ok for my power needs?

will my 800cc injectors be up to the task?

will low mount turbos (want to stay low mount for police reasons) able to deliver the flow needed for 450awkw?

I tried to search some reviews or comparisons on stroker kits and it seems that in general there really isnt a bad one. As with any build, I dont really want to spend the money on a kit that is rated for 1500hp if I dont need to.

Thank you in advance for all and any advice

[Dose Pipe Sutututu]

Why such long duration cams? no real benefit.

A GTX3582 in twin scroll, twin gates will be a good choice with fantastic response on a stroker.

[GTSBoy]

800cc injectors have no headroom at that level.

[khezz]

Why such long duration cams? no real benefit.

A GTX3582 in twin scroll, twin gates will be a good choice with fantastic response on a stroker.

It seems that around that duration I will get even better mid range torque and response. As for the torbos, I was really hoping to have something that bolts on to std manifolds Edited April 6, 2016 by khezz

[Dose Pipe Sutututu]

It seems that around that duration I will get even better mid range torque and response.

You mean you'll get more lag and shift the mid range higher up the RPM..

Longer duration cams are not the answer to getting better response or making better mid range.. Yes you will make more torque yes you'll make more power but not where you want it.. and that's nice and early.

[XKLABA]

You mean you'll get more lag and shift the mid range higher up the RPM..

Longer duration cams are not the answer to getting better response or making better mid range.. Yes you will make more torque yes you'll make more power but not where you want it.. and that's nice and early.

Something we can agree on, Unigroup Engineering do a 260x10.85mm custom cams, I have just fitted a pair of these and they are a good peice of gear

GTX2863Rs cores can be fitted to your Nismo turbos, are a good match for a 2.8 and will easy make north of 450rwkw with the right supporting mods providing they are the .60 front covers

800cc injector may cover you on 98 but not on E85 and with the SS injectors available I would and did go that way, ID1300s

[Dose Pipe Sutututu]

I would just go straight up to 2200cc Bosch injectors.. why not if there's such a small price difference.

[khezz]

I am happy to stay with 98ron fuel. E85 is still not that readily available in Perth. So for cams stay 10.5 lift or more but keep duration under 270. Got it.

Is there an I tank pump that will give me enough flow? Has a Bosch in tank now but I know it won't cut it.

Wow. Thanks for all the info.

What about my choice of stroker kit? Spool ok?

[XKLABA]

2000s are cheaper, but not SS, they do do a 1700 or they abouts now that is SS

[Dose Pipe Sutututu]

Walbro 450L F9000267 by TI Automotive will do it.. just need to wire it up to at least a 30amp relay and at 25amp fuse on some decent wiring.

get 260 degree cams (there abouts) like the other boys....

yes big duration cams go brap brap brap brap at the lights.. but when you get flogged by a Golf GTI it's embarrassing .

[bigmikespec]

It seems that around that duration I will get even better mid range torque and response. As for the torbos, I was really hoping to have something that bolts on to std manifolds

You will get reversion through the exhaust with the overlap too...

[khezz]

Tomei have 260/10.8. One problem solved.

[Dose Pipe Sutututu]

now, time to get that twin scroll setup going with a GTX3582

[khezz]

GTX2863Rs cores can be fitted to your Nismo turbos, are a good match for a 2.8 and will easy make north of 450rwkw with the right supporting mods providing they are the .60 front covers

I would rather go for a pair of new turbos. In my limited experience old turbos are just that, old turbos. What ever happened to the t517z and t618z turbos?

[Piggaz]

Died a lazy death.

[KiwiRS4T]

I would rather go for a pair of new turbos. In my limited experience old turbos are just that, old turbos. What ever happened to the t517z and t618z turbos?

New turbos (from Full-Race Geoff):

- when a tall RB30 block is used, I suggest twin EFR6758 (or twin EFR7163 depending on fuel and boost target). The twin EFR setups are not for everyone - there is more piping/lines/two turbos ... twin EFRs fit better than a large single in these cars - and for a responsive 750hp there is nothing that can touch this. We make the downpipes and charge pipe so this is a bolton affair to replace the existing -5s

[GTSBoy]

I would rather go for a pair of new turbos. In my limited experience old turbos are just that, old turbos. What ever happened to the t517z and t618z turbos?

The cores would be new.

[Dose Pipe Sutututu]

I would rather go for a pair of new turbos. In my limited experience old turbos are just that, old turbos. What ever happened to the t517z and t618z turbos?

they're junk, pieces of shit.. even a single one on a SR20 (which I mainly play with) are horse shit.. make crap all power and lag.

[Dose Pipe Sutututu]

the best, read all you twin fan boys:

https://www.turbobygarrett.com/turbobygarrett/differences_between_turbos

Quote (also the best): "In most cases, for top performance, a single turbo is preferable because larger turbos are generally more efficient than smaller turbos. However, often there is not room for one large single, or the tuner wants the visual impact of twin turbos."

[XKLABA]

I suggested fitting GTX cores to your housing for factory appearance, the turbos would be "new" just have old housings machined to fit