Ok,
I'm looking for some opinions on the RC 550s... Are these usable with our engines? Are they controllable by the S-AFC or are they too big? And what's all this talk about discs with FMU's and whatnot? I know the last 2 questions were probably searchable and I apologize for not doing so, but I figured I'd kill all my birds with a coupel stones. Also, what injectors (brands + sizes), are people running with Stage III and Stage IV, and what are some personal experiences with different brands? I've just recently purchased an S-AFC, when my tax-return check comes in about 1.5 months I'll have the $$ for the bottom end kit.. so now I'm looking for injectors and other various stuff I'll need..

Gary

I have RC 625's but I don't have them on yet. (still doing major work on the car) For stage 4 you are going to want 625cc or higher controlled by a DFI or something along those lines.

As far as RC goes they make a quality product.

The s-afc can control 440cc but I have read that over that and your going to be hella rich.

If your going to run stage 3 I would just go w/ the s-afc and some 440cc.

>I have RC 625's but I don't have them on yet. (still doing
>major work on the car) For stage 4 you are going to want
>625cc or higher controlled by a DFI or something along those
>lines.
>
>As far as RC goes they make a quality product.
>
>The s-afc can control 440cc but I have read that over that
>and your going to be hella rich.
>
>If your going to run stage 3 I would just go w/ the s-afc
>and some 440cc.


IS a DFI the same as an FMU?? All these abbreviations have my head spinning =) How big is the difference between stages 3 & 4 at 15 psi. on just 93 octane? Does Stage IV make more power only when boosting on race gas, or does it always, due to the injector size?

Gary

Basically,
I'm trying to figure out a good fuel system for a stage IV setup.. Would 625/650cc injectors and a Vortec super FMU, suffice (along with the in-line pump)? Or are there other parts missing besides these??

Gary

>IS a DFI the same as an FMU??

no

>How big is the difference between stages 3 & 4 at 15 psi.

none. 15 psi of boost is 15psi of boost. Stage 3 runs 15psi and not much more. Stage 4 is 15+ I am going to run around 18psi on pump gas and 25psi at the track on race gas. (when and if I ever get done w/ this build-up)

The differences between stage 3 and 4 are the fuel systems.

The DFI is a piggyback computer that overrides your stock ECU and allows you to run bigger injectors. (put shortly)
as Dino said once in a post "the DFI is and S-AFC on steroids"

You still need a FMU w/ the DFI. I would go w/ the vortech unit.


HRC still doesn't have a stage 3 available but you can basically build your own (just upgrade you fuel system and turn up the boost):-)

>>IS a DFI the same as an FMU??
>
>no
>
>>How big is the difference between stages 3 & 4 at 15 psi.
>
>none. 15 psi of boost is 15psi of boost. Stage 3 runs 15psi
>and not much more. Stage 4 is 15+ I am going to run around
>18psi on pump gas and 25psi at the track on race gas. (when
>and if I ever get done w/ this build-up)
>
>The differences between stage 3 and 4 are the fuel systems.
>
>The DFI is a piggyback computer that overrides your stock
>ECU and allows you to run bigger injectors. (put shortly)
>as Dino said once in a post "the DFI is and S-AFC on
>steroids"
>
>You still need a FMU w/ the DFI. I would go w/ the vortech
>unit.
>
>
>HRC still doesn't have a stage 3 available but you can
>basically build your own (just upgrade you fuel system and
>turn up the boost):-)

So for stage IV, i'm going to need the FMU & DFI, & injectors? Anything else? So the S-AFC is useless past stage III then.. Hmm
What's the price for a DFI?

Gary

Accel DFI gen 6 1100.00

you will also need something for you ignition. i.e. crane or msd

and you wont need a S-AFC for stage 4

You're currently Stage III then right? What are your thoughts on it.. Do you have any track times? I'm just trying to see if I should go in order from III to IV or just skip III and go straight to IV.. I know III is definately reachable for me by July, but I'm not sure if I'll be craving more power by the end of summer and wished I had gone to IV.. What are some of the kills you've had in stage III? Maybe that'll be enough to keep me happy with stage III =) Also, is 15psi the max boost on 93 octane with stage III or is 17-18 attainable safely?

Gary

Stage 3 never happened. I was sitting and staring at my car and the millions of parts that are off of it and I just said, fuck it I am just going all the way. I dont know if I will ever be able to play around w/ a car like this in the future. (kids, mortgage, retirement, all that crap that comes with old age)

I am twenty-four now and I want to be able to say I built at least one monster in my lifetime. I am also getting tired of the 4g63 guys I hang around telling me my car will never get into the 12's. So I am just out to prove to myself and others that this platform can be fast.

I was going to just build a stage 3 setup but I just want more