Startup Problems - Page 2

Dale McPeters · 11-09-2005, 07:17 AM

My statements are made based on '88-'93 EEC-IV cars.

Since I do not know what your complete combination is just some suggestions stated below.

I would also recheck your maf curve and injector settings as the 31 & 33 do not seem right to me. It looks like you used the injector slopes to compensate for something else like the maf curve, load etc. being off....
Normally I have seen injector H/L slopes set the same 30 & 30 or 30ish & 36ish. Well except in some cases on some blower/power adder cars.
When I ran 30's I had them set to 30 & 30 using the X3Z based cobra setup. Of course I am always the odd ball.

If you used EA to calculate the injector settings before the MAF curve was dialed in correctly this maybe why they look so different to me.

One other thing that I would like to add is the MAF curve is the most important part of the equation....

Note this is just MHO, YMMV.

88GtHatchback · 11-09-2005, 08:31 AM

So would you suggest that I go back to 30 and 36 then work on the MAF curve some more? Ill give it a try. I did play with the startup fuel table and I think I got it a little better. I will see today when I drive it.

Thanks,
Clay

93Cobra#2771 · 11-09-2005, 08:32 AM

Nope, I'd leave the EA suggest MAF and slopes, and focus on your startup fuel table...

Dale McPeters · 11-09-2005, 08:48 AM

Agreed.

The post that I made above was really more of an observation than suggesting that you start over...
I do however suggest that in the future if you ever do start on another tune that you dial in the MAF curve "before" running the injector stuff through EA.
The closer you can get the MAF the better off you will be, because if it is off you may run into problems down the road with your tune changing over time etc. etc. etc.

88GtHatchback · 11-09-2005, 10:43 AM

I will keep messing with the startup tables. I can see myself starting a new tune in the near future. Im going to the track this weekend so I dont have time to do it before then.

Clay

86GT · 11-09-2005, 01:39 PM

It might be better to set the slopes as Dale mentioned. This is only if you have the fuel pressure set to the factory setting of 39psi. The slopes are the one thing that you can get close by guessing.

The MAF on the other hand is the most important thing. If you artificially lowered it or raised it while compensating with the slopes then the LOAD calculations can be way out. This will ein affect mess with spark and fuel.

I would make sure the MAF is correct. Where did you get the original MAF curve? If it is unknown, then I would definatley set the slopes to what ever the injector size is plus or minus some 'x' amount for fuel pressure differences. Then soley concentrate on the MAF.

86GT · 11-09-2005, 01:41 PM

Another way to do this would be to place a stock MAF and MAF curve in and tune the injector slopes, breakpoint and offsets. Once all that is dialed in then swap in the new MAF and never touch the injector stuff again.

Dale McPeters · 11-09-2005, 01:48 PM

11-09-2005, 07:17 AM	#11
Dale McPeters 5.0 Block/Walnut Cracker Join Date: May 2005 Location: Working.... Posts: 2,409	Re: Startup Problems My statements are made based on '88-'93 EEC-IV cars. Since I do not know what your complete combination is just some suggestions stated below. I would also recheck your maf curve and injector settings as the 31 & 33 do not seem right to me. It looks like you used the injector slopes to compensate for something else like the maf curve, load etc. being off.... Normally I have seen injector H/L slopes set the same 30 & 30 or 30ish & 36ish. Well except in some cases on some blower/power adder cars. When I ran 30's I had them set to 30 & 30 using the X3Z based cobra setup. Of course I am always the odd ball. If you used EA to calculate the injector settings before the MAF curve was dialed in correctly this maybe why they look so different to me. One other thing that I would like to add is the MAF curve is the most important part of the equation.... Note this is just MHO, YMMV. __________________ '14 Dodge Challenger SRT8 392 6-speed

11-09-2005, 08:31 AM	#12
88GtHatchback Junior Member Join Date: Sep 2005 Posts: 7	Re: Startup Problems So would you suggest that I go back to 30 and 36 then work on the MAF curve some more? Ill give it a try. I did play with the startup fuel table and I think I got it a little better. I will see today when I drive it. Thanks, Clay

11-09-2005, 08:32 AM	#13
93Cobra#2771 The Kocky One Join Date: Dec 2004 Location: Yeah, but those cutters won't bust any walnuts.â„¢ Posts: 1,948	Re: Startup Problems Nope, I'd leave the EA suggest MAF and slopes, and focus on your startup fuel table... __________________ *For Sale: Reproduction Window Stickers, 87+ Mustangs, Cobras, Lightnings, and HD F150!* Richard White 93 Cobra Kocky will be back!

11-09-2005, 08:48 AM	#14
Dale McPeters 5.0 Block/Walnut Cracker Join Date: May 2005 Location: Working.... Posts: 2,409	Re: Startup Problems Agreed. The post that I made above was really more of an observation than suggesting that you start over... I do however suggest that in the future if you ever do start on another tune that you dial in the MAF curve "before" running the injector stuff through EA. The closer you can get the MAF the better off you will be, because if it is off you may run into problems down the road with your tune changing over time etc. etc. etc. __________________ '14 Dodge Challenger SRT8 392 6-speed

11-09-2005, 10:43 AM	#15
88GtHatchback Junior Member Join Date: Sep 2005 Posts: 7	Re: Startup Problems I will keep messing with the startup tables. I can see myself starting a new tune in the near future. Im going to the track this weekend so I dont have time to do it before then. Clay

11-09-2005, 01:39 PM	#16
86GT Member Join Date: Mar 2005 Location: Sacramento California Posts: 449	Re: Startup Problems It might be better to set the slopes as Dale mentioned. This is only if you have the fuel pressure set to the factory setting of 39psi. The slopes are the one thing that you can get close by guessing. The MAF on the other hand is the most important thing. If you artificially lowered it or raised it while compensating with the slopes then the LOAD calculations can be way out. This will ein affect mess with spark and fuel. I would make sure the MAF is correct. Where did you get the original MAF curve? If it is unknown, then I would definatley set the slopes to what ever the injector size is plus or minus some 'x' amount for fuel pressure differences. Then soley concentrate on the MAF. __________________ EEC Analyzer A9M, TwEECer, 306ci, 73mm C&L w Tuner Tube, Cobra Intake, 42# inj, Edelbrock 6037, E303 cam, 155 fuel pump, FPR, 70mm TB, E-Fan, 3.55 gears, Powerdyne 9psi actual 5psi...way more.

11-09-2005, 01:41 PM	#17
86GT Member Join Date: Mar 2005 Location: Sacramento California Posts: 449	Re: Startup Problems Another way to do this would be to place a stock MAF and MAF curve in and tune the injector slopes, breakpoint and offsets. Once all that is dialed in then swap in the new MAF and never touch the injector stuff again. __________________ EEC Analyzer A9M, TwEECer, 306ci, 73mm C&L w Tuner Tube, Cobra Intake, 42# inj, Edelbrock 6037, E303 cam, 155 fuel pump, FPR, 70mm TB, E-Fan, 3.55 gears, Powerdyne 9psi actual 5psi...way more.

11-09-2005, 01:48 PM	#18
Dale McPeters 5.0 Block/Walnut Cracker Join Date: May 2005 Location: Working.... Posts: 2,409	Re: Startup Problems __________________ '14 Dodge Challenger SRT8 392 6-speed