Rb20 Which Path

[Tonks]

Hey people,

I currently have an rb20det with;

-Z32 AFM

-GTR 444cc injectors

-Walbro 250lph pump

-VG30 turbo (rb20 wastegate) running 15psi off a boost t

-Intercooler

-Cat back

-Nistune

Currently running around 190rwkw.

Now I have in my head two paths to go down.

1st, I was thinking leaving the vg30 turbs on there (has nil shaft play and blades look fantastic still) and upgrading to an E85 450lph Walbro pump, larger injectors and getting it tuned on E85. With that in mind what size injectors would I be looking at 750's or 1000cc's. 1000's seem massive to me on an rb20 with small to mild mods?

2nd path I was thinking was to go a hypergear hiflow and retune.

With either option i'm going to upgrade dump pipe and electronic boost controller.

Just after some opinions on which option would be a better bang for my back upgrade for the lack of a better term.

Cheers Steve.

[Guilt-Toy]

id just go for a hg turbo and re-tune. should go great. no point going through all the hassle for e85 if you are going to keep the same turbo.

[GTSBoy]

The VG turbo will explode if you push it any harder anyway. Best not to risk that.

[Tonks]

Thanks guys, makes the decision a bit easier.

My only thought running E85 on the vg30 at around the same boost level would help prolong its life?

[Tonks]

Forgot also, would it be worth while upgrading the exhaust manifold or retaining the stock one. I'm leaning towards leaving it seeing as it only a rb20?

[GTScotT]

Keep the stock manifold.

As the ceramic turbos are untested on E85 I wouldn't risk it. The theory is sound.. It should be cooler, but theres no guarantee the added power won't push the heat back up anyway.

I also agree a highflow to an appropriate size will yield better and more reliable results.

[Blackkers]

no real point of running e85 unless you want to boost the shit out of it. You won't get as much out of it at 15psi. the VG30 turbo won't hold up to that for long so I'd suggest a HG highflow and a retune on 98 for now, save the injectors for later then switch to e85

[Super Drager]

i'd go a hypergear ss1 on an rb20 tbh, they almost seem like a perfect match.

[GTSBoy]

With respect to whether e85 will make life easier on a ceramic turbo....it might, but I wouldn't count on it. The real killer is not heat, it's shaft speed. The mechanical forces acting on the bond between the ceramic and the shaft and internally in the blades rises at some high power of the rpm. Spin it too fast, and it go poof. Fast is either more air or more boost (just look at a compressor map and see why) and for more power (on e85 even) you need more air. With a fixed restriction downstream (the engine) the only way to get more air is more boost. So you're stuffed anyway.

Decision made above is a good one.

[Tonks]

Done deal then.

Thanks for the honest and excellent input guys!

[#skyginer]

E85 doesnt necessarily mean more boost.

The main benefit is actually the resistance to detonation

I think you should go the e85 path, big pump injectors and tune. Your tuner will be able to add a forkload more timing across the board and make your car drive more fun.

If you go the larger turbo route you'll definately get more lag, less time near boost in a street car and not enjoy it as much.

Or since you didnt mention dump pipe go kando td05 and wind up the boost :-)

My 2c worth

[Tonks]

Just ordered a ss1 from stao.

Now just Gunna double check everything's sweet so there's no surprises when it comes to tune time.

[scotty nm35]

E85 doesnt necessarily mean more boost.

The main benefit is actually the resistance to detonation

Exactly right, you can either add timing, boost or both. I chose boost and it works very well also.

I figured pushing the turbo hard was better than relying on the rods to take extra load, seeing they are stock.

[Tonks]

Exactly right, you can either add timing, boost or both. I chose boost and it works very well also.

I figured pushing the turbo hard was better than relying on the rods to take extra load, seeing they are stock.

I thought about it for a bit and came up with if I push the vg on e85 and it lets go I'm up for a turbo anyway.

So I'll get the ss1 in tuned and running and then look at e85 once I'm happy with how the cars going at that point in time.

[s213b]

I thought about it for a bit and came up with if I push the vg on e85 and it lets go I'm up for a turbo anyway.

So I'll get the ss1 in tuned and running and then look at e85 once I'm happy with how the cars going at that point in time.

I'd just get bigger injectors / pump and get it all tuned at once with the ss1. The money you'll spend on the re-tune you could have almost done the fuel system.

I just sold brand new unopened id1000's for $500 and bought a walbro 400lph new for $190.

A tune will usually set you back $500-$600

[Tonks]

For the sake of starting a new thread,

Just sussing out some more options, one of my current injectors is leaking (replaced o-rings and no difference, i assume its cracked maybe?). Im going to upgrade pump and injectors now as well as the SS1.

Basically question is should I just keep the resistor pack and stay with low imp GTR injectors, or revert back to the standard RB20 setup and look for some high imp injectors?

I've noticed there's a sale on RHD at the moment on SARD 800cc's too.

Edit: Also going to pick up a new Walbro pump, if I get the E85 compatible pump will it be safe to use 98 for a while and then when im ready switch to E85 later on? Or is it designed solely for E85?

Edited February 24, 2014 by Tonks

[GTSBoy]

Just buy ID1000s and be done with it.

[Missileman]

For the sake of starting a new thread,

Just sussing out some more options, one of my current injectors is leaking (replaced o-rings and no difference, i assume its cracked maybe?). Im going to upgrade pump and injectors now as well as the SS1.

Basically question is should I just keep the resistor pack and stay with low imp GTR injectors, or revert back to the standard RB20 setup and look for some high imp injectors?

I've noticed there's a sale on RHD at the moment on SARD 800cc's too.

Edit: Also going to pick up a new Walbro pump, if I get the E85 compatible pump will it be safe to use 98 for a while and then when im ready switch to E85 later on? Or is it designed solely for E85?

Go with deastchwerks, they're bosch ev14s, high impedance and drop in fit for the RB20

http://www.deatschwerks.com/products/fuel-injectors/sport-compact/nissan/skyline/rb20det/1989-94-rb20det

Edited February 24, 2014 by Missileman

[iruvyouskyrine]

Just buy ID1000s and be done with it.

This