While I find that very interesting, I'm not certain the OP will find it overwhelmingly useful. As you can see many similarities. you can also see its not the same system. And yes you have larger injectors. A huge prime shot, but then zero crank fuel. As you say, this works for you. But you can also see a number of adjustments that don't exist on the less expensive summit system, and some that are basically the same with different names.

 

I've got an FI Tech system on the '32 Ford I bought a few months ago. 383/Comp 270 cam, Twisted Wedge heads and Edelbrock RPM intake.

I haven't played with it yet as it runs really well overall. I've got a Holley Dominator EFI on my twin turbo Vette...so used to working with it. I appreciate the info as I haven't studied the FI Tech at all.

Interestingly, the guy I got it from pointed out right off the bat that it started easily if you "hit the pedal twice" when cold after turning on the key....sort of like a carb. Seemed weird....but it does start immediately that way...yet requires a lot of extra cranking if you don't when it's sat for a week or so. Reading this maybe it's giving it time for that primer squirt.....I'll try it and study up.

Again, thanks for all the info!

JIM

 

Yes Jim. the ECU needs to get a reading that the engine is turning before it hits the primer fuel. then if you noticed on the gen FiTech settings supplied by BluThunder you will see a built in delay. Hitting the pedal is perhaps giving it some air however if the IAC Park is set low.
I also don't see a setting for IAC Park during cranking.
Like I said, the Summit system is made by Fi Tech. but they are not the same.

 

@4-vettes You're right, I didn't mean to post my settings as a "here's how you fix it" kind of thing, just for comparison. I wonder if the Summit brand TBI has some of the same settings in the ECU, but the handheld doesn't.

 

Phe-no-me-nal !!!!

These are pure slices of fried gold.

Many thanks for taking the time to write all this feedback.

I’m looking forward to experimenting this weekend !

 

‘will keep y’all posted, of course.

 

Please do keep us posted. I'm no great typer. so this is the short version. PM me if you have any MAX 500 questions.

 

This is what makes the Corvette Forum the place to be when you have questions or issues with a Corvette!

Thanks for the education on FITech systems and cold startups! It helps some of us more than you might know!

Happy New Year!

 

I would suggest trying as Jim posted and pump the pedal, that might signal the computer to inject a shot of fuel that is missing otherwise.


That's just cold start programming logic, not a dry manifold from sitting thing. As I posted before, I ran a GM TBI on top of a Performer intake on an old 350 for a while and it could sit all winter and still start within a few seconds of cranking without touching the pedal, just like starting it any other time. GM systems never inject fuel before cranking starts either. So, either Fitech didn't get cold starts right or FiTech purposely programmed their system to require a pedal pump to give it a shot of fuel like a carb or something is missing in the setup.

 

I can assure you that pumping the pedal has nothing to do with the primer shot. Not clear on how or why you believed that. It hits the primer shot when the ECU knows that the engine is turning. It gets this signal from the tach signal on the distributor.
Your correct, the genuine Delphi stuff is way smarter on a lot of things. I work on Harley's everyday. They also run Delphi fuel injection. We NEVER have to mess with cold start programming unless it's a really wild build.
And mine in all fairness takes 10 - 12 seconds of cranking if it's sat for a week. But then fires right up and settles down to a smooth idle in seconds.
I have tryed a bigger shot and more warm up fuel. it does fire quicker but then idles rich. And it causes trouble with starts that are cold but not sitting. my settings are the best compromise I could come up with with this system.
Your correct. It's just not as refined as the Gen. GM (Delphi) system. But it's still heaps better than a carb.

 

The problem is solved, Gents. And I thank you all for helping me resolve an issue that has been nagging since the summer of 2019 when I first slapped the EFI install on there.

The Summit/Fitech one does and that is how I have been starting it up since 2019.

The Summit does two things on key:
1. When you move the key from off to run, without cranking, the fuel pressurizes and, after what feels like three seconds, the injectors fire a single shot of fuel. The fuel pump then shuts off. I have confirmed this visually multiple times.
2. Whether you do the above or not, once you move the key to crank, the injectors will send shots of fuel while cranking with the fuel pump on.

Number 2 is where my issue was. I was getting zero cranking fuel. Why ?

I plugged the handheld device into the ECU and noticed that while cranking, no RPM was detected .

I then busted out the DMM and checked the voltage of the line leading to the EFI and indeed, I would get 12 volts on run, but 0 volts when cranking.

That explains everything: the need to prime first without cranking; the stumble right after it catches; and the nearly impossible start if you keep cranking and skip priming.

I traced the power source back to the fuse panel and found it was plugged onto the ACC spade. I simply swapped it with the IGN spade which was taken by the fog light (mandatory over here and) an accessory if there ever was one.

Aaaand... that solved it. It starts on crank all the time, with or without the priming shot. I must have started and shutdown the car a dozen time to enjoy the experience the EFI goodness of key-and-go. It transforms the feel of the car giving it a much more robust feel.



Many thanks again,

DC3

 

Now that's a great outcome!! Thanks to all...as I know I've learned a few things!

JIM

 

Glad to hear that you got it figured out. WOW, a bad job of wiring in the first place, go figure.

 

 

[QUOTE=4-vettes;1604532922]I'm happy to walk you through all of this. There are a LOT of settings that you may not be aware of. But this system is tunable. I've been running it for over 2 years. And although I have tuned with numerous systems. This one is different in many ways from all the others I have used. So step one is to ignore advice from anyone using a different system/tuner.

Hello and many thanks for the info you have supplied on this thread.
In fact I just posted a request for help on this topic. ALthough I searched quite a bit before starting a new thread, and somehow I missed this one, but found it whilst searching again
Question: The settings you have shown us, they are all set by you manually.
For example on one of the shots you posted, "WARM UP 65F FUEL at 19.5" was highlighted in yellow and the rest showed in white. These other non highlighted settings were inputted by you as well?
Meaning if I set up my system with those figures you have shown, I should be on the right track?
I have a C3 454 74 Manual car.

Thank you for your comments pls.
Cheers

 

Yes, these all need to be put in by you. The system only learns fuel curves. Nothing else.