3RDGENFRANK

I have had the Haltech DFI on my car for a couple of years now. So far I love it. It's pretty intuative and easy to tune. Couple of questions.

1. My stock tach reads around 1000 rpm slow at the top end. Is my trigger angle off?

2. At idle my car gets pretty hot even with an Edelbrock water pump and Griffin radiator. The car runs slighlty rich at idle at around 900 rpm and 10 degrees timing. Any ideas?

3. In fuel setup, do you use batch fire or multi-port?

If you have a similar engine (GM V8) email me your summary page of all settings and maybe even a copy of your calibration. Thanks.

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1992 Camaro Z28; Engine:383 w/Edelbrock RPM ported heads. Lunati Solid Roller Cam 224/232 .502/.502, Fluidampner, 1.5 Roller rockers, 30 lb injectors. Haltech E6GM DFI, SLP 1 3/4" headers, 4" Mufflex, T56, 4.10. Super Ram.

Mo steel for Mo stremph!

FastBroker

I can't give you my DFI settings but I will tell you need about 20 degrees of idle timing in an engine like that. It's inborn in most people that 10 degrees is ideal from HEI work but its set at 10 degrees just to get the rest of the curve in the ballpark. Try 15 at first and see how the engine behaves. You'll see a HUGE improvement in changing it higher and your engine should cool down a little... If you are not using idle control, your idle speed will have to be lowered because it will rise with the spark change. Use a ROBERSTHAW high-flow thermostat, too, if you are not already. That will help A LOT, too.

If you post your timing table here, I will help you with it...

Batch vs Sequential depends on your combo. I've had some work better with either setting. Just depends.

That thing must haul butt!!!

[This message has been edited by FastBroker (edited February 17, 2001).]

3RDGENFRANK

Thanks for the info. I'll have to try your suggestions. I can't use sequential mode because that can only be used for up to four cylinders. I know the stock ecm used batch-fire, but I'm not sure whether to use batch-fire or multiport mode in fuel setup. If I use batch-fire, how many injector pulses per revolution? For my ignition timing, I used the automatic ignition map with idle at 10 degrees and 34 degrees total timing coming in at 2500 rpm. I'll play with different maps and base timing tonight. Any ideas on the tach discrepancies?

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1992 Camaro Z28; Engine:383 w/Edelbrock RPM ported heads. Lunati Solid Roller Cam 224/232 .502/.502, Fluidampner, 1.5 Roller rockers, 30 lb injectors. Haltech E6GM DFI, SLP 1 3/4" headers, 4" Mufflex, T56, 4.10. Super Ram.

Mo steel for Mo stremph!

87Z-ya

iTrader: (1)

Are you using a ignition amp like a msd?
If so and the comp is not getting the signal from the msd tach output could cause problems but usually at low rpm not high. Just shootin in the wind here.

[This message has been edited by 87Z-ya (edited February 19, 2001).]

FastBroker

you CANNOT use the generic timing curve. It is puruposely mellow (to avoid destruction and lawsuits) and HAS TO BE CHANGED. Post the curve here and I will help. if you do not post it, I cannot/will not help.

10 degrees at idle will not work on your engine, trust me. I use HEI's with full vacuum advance at idle to cure this problem, as do many others.

3RDGENFRANK

Fastbroker,

Thanks for all of your help. I'm not proficient in html, so I am going to save my calibration and e-mail it to you. You should be able to open it and modify anything needed. I'll send it later tonight. Again, thanks. Out of curiosity, what makes the ignition maps bad. If I set the idle advance and full advance and the rpm to go to full advance, what makes it mellow? Wouldn't that work just like a vacuum advance distributor?

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1992 Camaro Z28; Engine:383 w/Edelbrock RPM ported heads. Lunati Solid Roller Cam 224/232 .502/.502, Fluidampner, 1.5 Roller rockers, 30 lb injectors. Haltech E6GM DFI, SLP 1 3/4" headers, 4" Mufflex, T56, 4.10. Super Ram.

Mo steel for Mo stremph!

FastBroker

Not gonna happen that way. Make an EXCEL spreadsheet or something and post the spark info here. you cannot email me, sorry...

87Z-ya

iTrader: (1)

The whole benefit to comp controled timing is to be able to throw timing in or out here and there wherever the engine wants it.

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87z 383,afr 190's, comp hyd roller(242/248-.540/.562,114 sep),Ported and polished mini ram, 30lb inj, 3.42 gears, tremec 5spd, , 1,3/4" slp headers, speed pro bank to bank-wb02.
"Just remember children, no man can beat you once youv'e found the cliterous." 'chef'

3RDGENFRANK

Last night I bumped up the timing at idle to 18 degrees. I tried everything between 5 and 30 degrees base timing. It only seemed to have an effect at if I brought it below 10-15 degrees which can be expected. I also brought the O2 voltages to around 650 mV at idle. I was hoping this would make my car run a little cooler. I didn't help much in that department, but drivability improved. It also doesn't like to idle below 950 rpm. with these new settings. Occasionally it will die after pushing in the clutch upon decelerating. I think I can fix that with the pulse divider, though. Thanks for the help so far. Keep it coming. Right now my timing is base:18*,full advance:34*(a little high I think, but no pinging), and full advance by 2000 rpm, plus an additional 6* for light load cruising. So basically my timing curve starts at 18* at 900 rpm, ramps up uniformly from there to 34* at 2000 rpm and stays there to 6000. Any other suggestions?

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1992 Camaro Z28; Engine:383 w/Edelbrock RPM ported heads. Lunati Solid Roller Cam 224/232 .502/.502, Fluidampr, 1.5 Roller rockers, 30 lb injectors. Haltech E6GM DFI, SLP 1 3/4" headers, 4" Mufflex, T56, 4.10. Super Ram.

Mo steel for Mo stremph!

FastBroker

I'd move the curve so that all the timing was in by 2500 or so, not 2000, and MAYBE bump it to 36 tot by 2500 instead of 36, too. You just gotta try a lot of combos, that's all. Also, I'd have a total of 8-10 additional degrees of light-vacuum "vacuum" advance for light input cruising, instead of your 6 (I think you said 6?)

I still think you need 20+ degrees (Honestly, 23-25deg) of advance at your idle.

Keep trying.

[This message has been edited by FastBroker (edited February 22, 2001).]

3RDGENFRANK

Thanks FASTBROKER. I'll bump it some more since it doesn't seem to hurt anything. Quick question, if I do bump it up as you say, is that still considered a mellow map if I use the quickmap option to produce the ignition curve?

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1992 Camaro Z28; Engine:383 w/Edelbrock RPM ported heads. Lunati Solid Roller Cam 224/232 .502/.502, Fluidampr, 1.5 Roller rockers, 30 lb injectors. Haltech E6GM DFI, SLP 1 3/4" headers, 4" Mufflex, T56, 4.10. Super Ram.

Mo steel for Mo stremph!

FastBroker

I wouldn't say MELLOW but it's just not a good overall spark curve. It will get you by, though, but is FAR from optimum in most rpm/MAP ranges. You really oughta program a full spark curve in the engine instead of the QUICK version, which basically mimics an HEI distributor's curve. Using the numbers I gave you in the above post will probably not work properly with the QUICK curve function in the DFI, anyway, so you gotta learn.

Let us know how you make out. Well, how you do, anyway...

[This message has been edited by FastBroker (edited February 23, 2001).]