Poseur

Is 11 PSI safe with S5 turbo (or ported wastegate S4 turbo) an RB Turbo-back, FCD, SAFC and stock fuel system? Or is a Walbro with stock injectors okay, or will i need new injectors too?

ilike2eatricers

I believe the SAFC is more for tuning down larger injectors instead of tuning up smaller injectors. You should be at least getting a walbro and should still port the s5 turbo wg.

Poseur

Okay, so how does this setup sound?

-RB Turbo-back exhaust
-FCD
-Ported wastegate
-Walbro
-Some sort of boost controller (been looking at Blitz SBC-ID any comments?)

So new injectors and/or fuel controller are not required for 11 psi?

razorback

get bigger injectors. 720 should be fine.

ilike2eatricers

Not required but it does build a good base for future mods.

High Voltage

I know jack about RX-7's as of yet, but comeing from the dsm world which is a very tuner friendly car. Please spare the engine and DO NOT get a FCD... it's just slaping a bandage on it rather than resolveing the cause.

Poseur

From what I understand boost is limited from the factory and an FCD is required to prevent fuel cut to the rear rotor when boost levels excede this limit. I do not see how this is slapping a bandage on a problem, I see no other way around it.

An FCD is even recomended by Racing Beat, who I'm sure know what they're talking about.

Also, a few questions about injectors. Stock, there are four 550cc injectors, correct? When upgrading, do I need to upgrade all of them, just the primaries, or just the secondaries? In case it makes a difference, my goal for this car isn't much more than 250-280 flywheel hp.

ilike2eatricers

Having an FCD is not a bandaid unless you consider the solving the problem going standalone.

If you hp goal is only 280fwhp (flywheel) I would just recommend upgrading your secondaries to 680s or 720s. It also depends on what method you plan on using to control your fuel (SAFC, standalone).

J-Rat

iTrader: (2)

I will have to tell that to my friend that runs a 400+ DSM. With an FCD.

dvls-7

Good list....just add 720s (for the secondarys) and a SAFC to control them.

RotaryWeaponSE7EN

iTrader: (6)

W/ the s5 turbo u dont have to port the wastegate.

Terrh

iTrader: (7)

bigger injectors won't help if your fuel pump can't pump enough fuel to control them.

I'd get 720's AND a fuel pump.

I run 11PSI from about 3500-5000 RPM with stock fuel system and an SAFC, but 11 PSI at redline requires more fuel than the stock injctors can deliver.

Poseur

Will an S5 turbo be able to effectively control 11 psi? How about if I upgrade my intake?

I'm also not exactly a master with the Dremmel, so I like the idea of just bolting on an S5 turbo, will it bolt up with the S4 block if I get a new manifold?

ilike2eatricers

Dead wrong. I have an s5 turbo with ported wg and RB turboback with apexi intake and it still creeps slightly because I didnt port large/deep enough. You will still have to port it. Even if you didnt, porting it larger would give you better boost control.

You will need the s5 turbo and s5 manifold and you will still need to port with the mods you listed.

HAILERS

I'll put it this way. I have a series four with a series five turbo/manifold upgraded by Majestic Turbo and a Turbo/XS manual boost controller set at 10psi, with a Racing Beat 2/12 inch downpipe and a catback. And a fuel pump rewire with a clean fuel filter and a clean fuel strainer. Coupled with a wideband AFR meter from TechEdge and a SAFC with gobs of fuel REMOVED. Sorry, but my car must be the only car on this forum fucked up. It runs afr in the 11/12 range at 10psi. Oh....I have another car similar and it's fucked up also. Lots of fuel REMOVED and afr in the 11/12....low 12's. If I add or Initialize the SAFC the afr go into the toilet...as in the 10's and I've seen high 9's. Did I say Majestic Turbo? http://www.majesticturbo.com/