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Does anyone know of another solution to change the MAP parameters without having to pay someone with EFI live to read the tune out, change the parameters and put it back? The MAP parameters aren't...

When this happens on mine I noticed that a much lower IPW was delivered on the second crank. I took this as an indication that the cranking fuel needed to be reduced. I'm still working through this...

I disabled the prime mass and it hasn't had any noticeable negative effect. This seems to make tuning the 1st and 2nd pulse parameters possible. On a separate issue my delayed start while hot went...

We might not be talking about the same parameter. I'm referring to the prime pulse mass.

I apologize, I'm not familiar with the GM PCM designations. It is the factory computer for a 2002 Camaro.

The title pretty much explains my question. I recently learned that some other GM application actually don't use the prime pulse.

I understand that the prime pulse is not intended to provide fuel...

Good input but would this apply to the vehicles he has with a return style fuel system?

I was thinking that the second start attempt is working because the VCM is delivering another set of startup...

Milan, Could you post two logs? One at the original min fuel mg you had with the problem and another at the value that helped smooth things out. I would do the same but my car is disabled at the...

Thank you for your feedback. In my case I have a 408 and it runs 2.1 ms at idle (lambda =1). The SPA even isn't coming into effect. I'm still working to get rid of all the surging (not a big cam...

You could access the online help file installation instructions using this link. http://www.hptuners.com/help/

Click Getting Started => Software Installation

I'm considering making the investment in upgrading from the FRPP 80's to a set of Injector Dynamics injectors.

I would like to get some feedback from someone that has made this same upgrade (FRPP...

I have corresponded with Paul using his work email previously. He is very busy but he was still able to find time to help answer my questions with the derivation of GM format data from Ford format...

Would you have any idea why when I did this I experienced more transient and bucking problems? For my injectors the derived min pw (fueling portion with the offset included) is quite small and...

I'm glad I wasn't the only one. This could be confirmed for sure if the transient fuel adjust units were known. Meaning how are they going to be scaled to match after an injector change? I think...

I will try that. My thoughts were that the prime pulse wasn't a factor because of the time delay before it is re-enabled (4 hours). I didn't realize that the trucks only have the first pulse. ...

I tried a hot start with the first and second pulse doubled above 90 degrees. It fired a little right away but then continued to crank for a while before starting. You can't see it in the video but...

Sure. He is one for now just in case I might receive some feedback before working on it this weekend.

I have another log where I tried opening the throttle. I thought it was helping so I...

Thank you for posting your tune. What was the reason you zeroed out the prime pulse? I've wondered if this is only applicable to the original non-return fuel system.

Also was your starting...

Ok, thank you. I start the logging before cranking so I can see what is going on. I was thinking you had to do the same.

Can you post your latest tune?

What cranking pulse width did it like after a heat soak? Also what is your pulse width at idle. I would like to see how this percentage difference compares to mine. My idle is ~1.9 -2.0 and the...

I was thinking the multiplier is used in conjunction with the OLFA table. I saw your latest updated in another thread but it would be nice to know exactly how these tables work.

I'm working...

I wanted to provide an update just in case anyone is waiting for the results of this experiment.

Long story short, the injector data that I derived during this process solved most of the problem...

I'm sorry, I don't understand your question or if it was directed to me??

Anyway, I wasn't successful in my exhaustive attempt to locate comprehensive information on tuning the transients (the...

If you've read this post and have some experience with the actual transient calibration procedure, please share.

Some specific questions I have are regarding adjusting the boiling time table. I...

I was able to accurately derive the data in gm format at 39.15 psid. If anyone needs this just PM me.