Please help...

8.5 to 1 compression LS/VTEC
RC 370's
Vortec 12 to 1 FMU

I know 12 to 1 and 370 might be too much already, but I don't have a choice right now. I'm trying to boost about 14psi or so. Anyone know what my VAFC settings should be for wide throttle?

 

You have to ditch that 12:1 disk. You need like a 6:1. It will just fall on it's face when it hits boost.

 

6:1 disk with maybe 35 psi base pressure. U might want to lean it out about 15 percent just to make those bad boys idle. Try playin with leaning it out around 10% partial throttle. Full throttle the computer can compensate, but u need to get a smaller pill in that fmu.
EVIL

 

Where can I get a smaller pill (I guess 6 to 1) for this FMU? It's the anodized blue Vortec one that everybody has. I am in NJ, and I'm trying to hit the track tomorrow night.

If I don't get the disc in time, do you think that I'll lean out if I ran stock '95 GSR injectors with the 12 to 1 FMU, and richen up the VAFC wide throttle 2 to 3%, running 11 to 12psi?

Thanks in advance....

 

http://www.vortechsuperchargers.com/...ries/fuel.html

 

No, you can not run 11-12 psi on stock injectors. Think about that... base fuel pressure is like 50 psi... add 12 psi for every lb of boost... so you're doing 50+144 = 194 psi of fuel pressure. On a pump that can swing maybe 100 on a GOOD day. How do you think it will work?

 

Just got back from the track. Today I went to get the 6 to 1 disc for the Vortech, and the guy gave me the wrong one. I checked the part number and it's the 8 to 1. Is that too much for 370cc injectors, or can I get the VAFC to lean it out enough?

I ran a best tonight of 11.86 at 116MPH. The car felt OK, but up top, at the higher RPMs, it felt like it was fading away. Not sure if it's too rich or lean. On Wide Throttle, I have the VAFC leaning the injectors out 7%, up to 5500rpms, then progressively more and more fuel, to 4% at redline. Feels good, but not perfect.

My question... should I keep the 8 to 1 disc, or get the 6 to 1 disc and play with the VAFC settings?

 

14psi of boost + 8:1 FMU = 112psi of additional fuel, + 40 base = 152psi of total fuel pressure. What kind of pump are you running that supplies that much fuel!? That might explain why you car feels like it's fading out up top, you're pump is probably WAY overworked and just can't supply you enough fuel.

 

I was too afraid to run 14psi tonight, because I had just put the 8:1 disc and the 370cc injectors in. I ran 9.5psi tonight. Was gonna boost more, but didn't want to deal with problems on the dragstrip.

So what can/should I do with the fuel?

(I am running a Walbro intake pump, 255gph I think)

 

Terry,

Maybe it's not fuel related, but you might need to run colder plugs. You should try the BKR7E-11, and gap it to .35-.38. See how that does. Im trying to find a set for this weekend...let me know if you find some.

You Suck.....so I dont have the fastest street civic in ALPHA any more....oh well. There is always someone faster. It's all good.

Congrats on your time.

 

That's the high pressure Walbro I take it? Cause it looks to me like your pushing 115+psi through the rail and to my knowldege, the Walbro runs dry at over 90psi. I still don't think you need such high pressure with 370's even at 12psi. Was it running rich at WOT? Try bringing it down to a 6:1 FMU, should help drop the pressure a bit and with 370's you shouldn't be worried about supplying fuel even for 12psi as long as you have moderate pressure in the rail (say 80ish psi), plus it'd be a helluvalot easier on that Walbro.

 

Thanks Paul. You still have the better MPH for the 11 second run. Your car feels much better up top than mine.

Fuel problems... my car sometimes boost great. At 9.5psi, it would break tires loose in 3rd gear. Other times it feels really weak, like something isn't right. It'll barely break tires loose on boost in 1st when that happens. Maybe my pump IS takin a ****. The only reason why I have a 8:1 disc is because the dude that sold it gave me the wrong one. I think I'm gonna try to grab a 6:1 tomorrow... or, should I keep the 8:1 and run an inline pump as well as the Walbro?

Oh yeah, I'm running the BKR6E-11's (1 heat range colder than stock), gapped at .28, stock wires, stock ignition. I think I need to advance my timing a bit, cuz I just threw the distributor on with it less than 1/2 (probably around 10 to 12 degress BTDC now).


[Modified by Incognito, 12:27 AM 10/12/2001]

 

Matawan eh? Heh I used to live in Old Bridge before I moved to Miami, graduated from OBHS in '97

 

Small world. I actually live in Old Bridge. Mailing address is Matawan. My sister went to OBHS. Graduated in 1998. I know a few people from the '97 class.

I'm having other problems now. I ran again at the track (Englishtown) tonight and only made 1 clean pass, and it wasn't even that clean. I hit 11.91 at 115MPH. On all of my other runs, the car would either not go into VTEC at all, or go into then fall out of VTEC pretty much right away. The check engine light isn't on, but I jumped the wires for the codes anyway, and it spit out code 3, 21 and 23. It's for MAP, VTEC oil pressure and VTEC switch. I checked the oil level and it's good. All my connections are good too. The only thing that I can think of is my MAP sensor seeing boost, making the car run on limp mode or something (but not drastic enough to trip the check engine light) and also disabling the VTEC system (could be the reason why codes 21 and 23 are on). I am running 5 check valves. Think the Missing Link thing is a worthwhile investment? (not sure how I feel about paying $50+ for a little block of aluminum)

 

5 check valves, ay ay ay.. yea that missing link is worth the investment. 11 sec car not running right, you gotta like that. Are you all stripped out?

 

I ran at Englishtown today and the car was running all kinds of f*cked up. Car kept falling out of VTEC. Checked a few things and I haven't found the problem yet. There was some dirt inside the VTEC solenoid screen, which could have blocked oil which made VTEC not work. Cleaned it out, and it would work and not work. Checked the wire connection at the ECU (to the VAFC) and the wire on the VTEC solenoid, and made sure all was well. On my last run of the day, the car seemed to boost OK. On the way home, it was falling out of VTEC again.

Anyone know much about the VAFC? The instructions says to cut the VTM wire, and hook up a wire from the VAFC to the ECU side of the harness. A friend of mine had the same falling out of VTEC problem, and he said by putting the stock VTM wire back together, and just leaving the VAFC's VTM wire hanging, VTEc will work. Is this true? I think the VTM is the oil pressure sensor (one that goes to the back of the block).

By the way, my runs today were 13.1 at 104, 12.6 at 105, 12.5 at 104, and 12.3 at 115MPH (VTEC was working somewhat on this run, but I missed 3rd gear hardcore)