[cheifpontiac]

OK, I now have an 18g and I need to invest in some kind of engine management stuff to control the 660 injectors I have but I have not yet installed. I am also going to upgrade to a VR4 (approx. 180 lph vs. 150 lph stock) fuel pump at the same time.

Can I get a decent tune with just a palm w/ logging setup and an S-AFC?

This post has been edited by cheifpontiac: 07 December 2005 - 01:24 PM

[teknoracer4fun]

Emanage ultimate is my best suggestion. It data logs, has more options for tuning over an SAFC but reguardless I would suggest using a wideband o2 when tuning.

[Ramocheese]

Yes, but unless they changed it (I haven't looked at the palm loggers in a long time for 2G's), the logger won't read knock count, so a wideband may make it a lot easier.

[snailspool]

you could just tune for timing... but yes a wide band whould be easier and maybe a bit safer. 660's are the biggest i have seen work reliably with a safc, because as you compensate for the larger injectors it moves the timing curve way up, one way to get around that is to get a chip burned if you have a e-prom and socketed ecu. To answer your original question though, yes i think you could get a mildly decent tune with just logger and safc.

This post has been edited by snailspool: 07 December 2005 - 01:45 PM

[Lithium]

you could just tune for timing... but yes a wide band whould be easier and maybe a bit safer. 660's are the biggest i have seen work reliably with a safc, because as you compensate for the larger injectors it moves the timing curve way up, one way to get around that is to get a chip burned if you have a e-prom and socketed ecu. To answer your original question though, yes i think you could get a mildly decent tune with just logger and safc.

I think that my 1995 has a e-prom and socketed ecu, 1. how would I know exactly, 2. where would I send it to get it chipped????

[slvrblt]

Pull the ECU out. Remove the metal cover (just a few screws). Look at the IC. If the IC is soldered in, then its not socketed.

Not sure? Post pics.

Have a look at: http://www.tmo.com/h.../checkeprom.htm

[cheifpontiac]

you could just tune for timing... but yes a wide band whould be easier and maybe a bit safer. 660's are the biggest i have seen work reliably with a safc, because as you compensate for the larger injectors it moves the timing curve way up, one way to get around that is to get a chip burned if you have a e-prom and socketed ecu. To answer your original question though, yes i think you could get a mildly decent tune with just logger and safc.

How do you just tune for timing?

Pull the ECU out. Remove the metal cover (just a few screws). Look at the IC. If the IC is soldered in, then its not socketed.

Not sure? Post pics.

Have a look at: http://www.tmo.com/h.../checkeprom.htm

slverblt, I checked out your garage and it shows you are using a safc with 680 injectors.. what else, if anything, are you using to tune?

[slvrblt]

ECU has a chip as well. W/O the SAFC, I could run a stock 14b at stock pressure and it would run fine.

I got the chip from Jeff Oberholtzer (Not sure if he still makes them).

You can still get Jeff's design from http://www.dsmchips.com from the guy who makes them for him.

This post has been edited by slvrblt: 07 December 2005 - 09:51 PM

[teknoracer4fun]

BTW your fuel pump you're looking at getting isnt gonna be able to really let you get the most out of your injectors. Dont skimp on this, spend the extra $$ and get a Walbro 255lph.

[cheifpontiac]

BTW your fuel pump you're looking at getting isnt gonna be able to really let you get the most out of your injectors. Dont skimp on this, spend the extra $$ and get a Walbro 255lph.

I've already got the Vr4 pump... so thats the one I'm gonna run at least for the time being. Is there any way to actually tell that Its not pushing enough fuel once I start logging?

I just didn't want to have to get an AFPR because those cost more than the pump

This post has been edited by cheifpontiac: 07 December 2005 - 11:30 PM

[Lithium]

I'm have to agree with teknotard, he is right on this, spend the extra $100 bucks and get a Walbro 255lph...... With an 18G at more than about 15-17lbs of boost you're gonna run out of fuel on that VR4 pump..... The Walbro should be good up to 22-25lbs. There was a chart somewhere that I read up on, I'll see if I can find this for you. I'm not sure what you should go with on like a 20G or larger at more than 25lbs, so if anyone knows you should let me in on the secret......

[Chicago1]

http://www.roadracee...pumptechtip.htm


a 255 is overkill for an 18G and . I have a 255 but haven't put it on since I still have the stock FPR/14b and my Denso 150 can support up to 400hp. The VR4 pupmp rewired should support a good amount of HP even that 18G.

[Lithium]

I don't know bout that, this is what I saw at the same site, go down to where it talks about injector sizing, notice that for an upgraded turbo pushing more than 20psi you will need to go to a walbro, the fuel pump upgrade on our stock pumsp will net you the same as putting in that new VR4 pump.

http://www.roadracee...com/eclfuel.htm

This post has been edited by Lithium: 08 December 2005 - 11:58 AM

[Chicago1]

Can't be our stock pumps flow at 140 lph @43psi @14v a GVR4 flows
180 lph @43psi @12v that's unwired. So how are you getting they flow the same? Do a rewire for 14Volts and I'm sure we are looking at 200lph+ on that GVR4 pump. That's flowing more than a Walboro 190 which supports around 400hp.

This post has been edited by Chicago1: 08 December 2005 - 12:13 PM

[Lithium]

Our stock pumps flow at 100lph@12V (actually I am told that it only recieves about 10V), when you do the rewire you get 140Lph @14V, The Stock VR4 pump already requires the 14V wiring to run at 180Lph, so you have to do the rewire to have it run at the stock settings. That is where you made the mistake.

This post has been edited by Lithium: 08 December 2005 - 12:21 PM