So I decided to upgrade my stock injectors to RC 440cc. Some people have told me that it will be hard to control these without Hondata/Neptune,etc....., but other people have told me that I shouldn't have any problems at all controlling them with my VAFC II. With these bigger injectors I will be running 8psi, on a stock motor with a Drag Gen 3 turbo kit. Sorry if this is really basic I just want to get a straight answer from people who aren't trying to get my money. Anyways thanks in advance.

 

you can control them with an afc. however...

the way that the afc works with larger injectors is to scale back map voltage. this places the ignition table into very dangerous areas. you basically advance your timing when you scale back your map signal.

some people have luck, some people don't. it's at your own risk. look into uberdata if you're short on cash.

 

a friend of was running a similar setup, he was using a Vafc and a FMU on 11psi. the only thing is u can't mash the gas right off the line or it will flood and bog , but once u get to a certain rpm u will be fine

 

I've had 440's with vafc . it will controll them , but i wouldn't recommend to much boost . i blew my stock block b20 on 12lbs . all i can say is becarefull with it

 

Do you feel that 8psi will be fairly safe?

 

sounds pretty safe to me ,but i know how the the urge to turn it up is!!

 

Yeah, for sure. I'm anxious to get these bigger injectors cause right now I'm only running 4psi and can't use VTEC, b/c things are so lean. Can't wait for 8psi and vtec. lol

 

Any more opinions/ideas?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by milanoturbosi &raquo;</TD></TR><TR><TD CLASS="quote">Do you feel that 8psi will be fairly safe?</TD></TR></TABLE>

U should have no prob with 8 .. how many pounds u run is not the thing u should be worried about ,, the tune is the important thing.. if that guy blew him on 12psi iit wasn't because he was runing to much boost . i either wasnt runed right or he did have everything nessisary for his setup.....such as a fmu , fuel pump , FPR

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by milanoturbosi &raquo;</TD></TR><TR><TD CLASS="quote">Any more opinions/ideas?</TD></TR></TABLE>
if you are running the afc hack then i would suggest backing your timing down a little. It really is a shitty way of controlling your fuel. It jacks the timing way up.

 

no it was tuned a/f was good had an fmu 255 lph pump . just beat the hell out of it.
vafc isnt a real precision way to control fuel as compared to other ems ie. hondata

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ReDHaTcHy97 &raquo;</TD></TR><TR><TD CLASS="quote"> i either wasnt runed right or he did have everything nessisary for his setup.....such as a fmu , fuel pump , FPR</TD></TR></TABLE>


Did you just tell this guy to run an fmu with an afc?

 

Thanks for all the help. I know that Hondata is the best way to go but since I'm only a 17 year old high school kid that just spent 4500 on a turbo I can't afford it right now. lol. I'm really happy with the original tune so I feel that 8psi with the vafc should work out until I can afford Hondata. And also since I have a dual stage boost controller I won't be running 8psi around town for daily driving, which will save a lot of wear and tear on my motor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stealthmode62 &raquo;</TD></TR><TR><TD CLASS="quote"> Did you just tell this guy to run an fmu with an afc? </TD></TR></TABLE>
yeah i did .. thats what setup my friend was running Vafc 2 with a vortec fmu . he had no problems with his setup and he did beat the hell out of it.. he had it dyno tuned at dynamic motorsports in dillsburg pa.....and he made 289 on 11psi on a stock Ls motor, and ran it for almost a year like that with no problems.. car ran 12's on this setup


Modified by ReDHaTcHy97 at 3:50 PM 2/24/2005


Modified by ReDHaTcHy97 at 3:50 PM 2/24/2005

 

Still running RC 440's, V-AFC, and FMU.....check the sig

 

with the issues of advanced timing, it's actually suggested to run as much boost as your map sensor can handle. odd, but it's true. just ask J. Davis.

 

For the same price as a afc or vafc you can someone chip and program an ecu to handle your setup 10x better than any hack.

 

Here is my setup:
2000 ITR stock bottom end with wiseco forged pistons stock compression ratio.
2.5 Magnaflow exhaust including cat.
T3T4-8PSI
VAFC
450 injectors.
Timing retarded about 6 degrees.
Jacobs ice-pack ignition, MSD cap and wires.

The car runs fine once warmed up. It has cold start problems and throws a misfire code until it gets into closed loop.

Normal driving is ok but I get preignition in vacuum before boost.

Boost is ok because it retards timing on its own once I get over about 1 psi. I monitor it with an OBD2 program I have and it looks at all the sensors, timing, fuel correction...

The normal timing retard is to about 18 degrees. I do not know if the knock sensor or baro sensor or IAT sensor is doing it or a combo of all three.

I had a VAFC installed on my car for years and thought it would be an ok way to get the turbo going however, I will go with uberdata in the next few weeks because I want to have full control of all the fuel and ignition tables before I start running the car hard.

The VAFC works, but not as good as I would like it to as there is no real control over timing.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by milanoturbosi &raquo;</TD></TR><TR><TD CLASS="quote">So I decided to upgrade my stock injectors to RC 440cc. Some people have told me that it will be hard to control these without Hondata/Neptune,etc....., but other people have told me that I shouldn't have any problems at all controlling them with my VAFC II. With these bigger injectors I will be running 8psi, on a stock motor with a Drag Gen 3 turbo kit. </TD></TR></TABLE>

Running 450cc injectors on a D16Y8 w/VAFC II and it works. Idle is good.

The only bad thing is the fuel enrichment at startup. It seems to throw too much fuel in , but once it starts it idles fine. Sill throws a CEL at 11+psi but it hasn't ever been tuned with a wideband and it runs very rich. Could pry turn down the fuel / correction alot and get rid of the CEL completely but getting AEM soon.

Uberdata has drawback too. Like going from an OBDII ECU to OBD I.

 

Which motor? Si?

with high compression:

AFC Hack + Boost = cracked ring lands

 

8.5:1 forged