EFIDynoTuning Forum

It's not that different from what I'm running. Mine's an Edelbrock gen 1 Pro-Flo intake manifold which has been described to me as 'like' a Victor Jr but with slightly smaller ports.

It's all I've ever run but I've never been aware of a shortcoming that can be attributed to the intake.

Sean

No problem, I'm not trying to rush you along. Hopefully I have time to try out the Continental injector data myself next week. I'll need to dial back my fuel pressure to 43.5 (there isn't any other FP adjusted data I know of) and reset FN036 back to manufacturer's MAF values to see how it performs compared to the Deka IV data I've used earlier.

Sean

Thanks.

I altered some values in FN389-Dasphot CT Spark Multiplier and added a 2 degrees to each of the top 2 FN111 Y axis values.

- Is that enough additional timing to start?

- What's the indicator if the FN111 values are too high?

Sean

Is there a parameter (A9L2) that can help reduce the amount of popping that comes out of my sidepipes on deceleration? Anytime I get off the throttle there is some loud exhaust cackling that sounds kind of like a squadron of Harley-Davidson's. I'm hoping to make better friends of my neighbors down the hill from my house!

Sean

Fired it up yet? :)

I've added the Continental Deka V data to an updated tune and was anxious to try it but was concerned about the (big?) difference in low slope compared to the Siemens (Deka IV) data I've been using. After adjusting both to 43.5 psi FP, it looks like the Continental data is more than 17lb/hr lower than the Siemens low slope (high slope is very close). Seems like low slope will be richer than what I've been running but that's not taking into account the changes to things like breakpoint or offset in the new data.

I was hoping to follow your lead but I guess I might have to work up the nerve to try it myself!? Were you planning on adjusting your base FP to match the 43.5 psi the Continental data is provided at?

Sean

Thank you. I understand how the percentage is derived now.

Sean

I'm sure I still don't understand the GUFX xdf parameter titled "SP** Scaling Percentage (Auto Calc)".

I'm not scaling anything as far as I know it but I can't understand why I always see a value here of 2.6244%.

I know I'm not supposed to change it, I'd just like to understand what it represents. I've read the A9L2 write up but the explanation there and in TunerPro tips just doesn't sink in for me. Anyone care to take a different shot at explaining this?

Sean

I read the write up section regarding cranking PW and saw that it’s common to be +/- 25% of the calculated y axis adjustment and that it’s normal to require further tuning to correct warm/hot start issues.

What other parameters can affect warm/hot start? My tune seems to need considerably more than + 25% over the calculated y axis (Msec) value to start with ECT above 180 degrees.

How much is too much in terms of Msec of cranking PW?

Sean

I guess I'm confused by the Ford injector data including compensation multipliers for FP other than the pressure they offer slope & breakpoint @.

Continental simply has a single voltage/msec offset table, no modifier for different FP's. I can plug it in, but I'm trying to wrap my head around why some data (Ford Racing) is offered with alternative FP modifiers and some (Continental) isn't. I wanted to make sure I wasn't missing another piece of the puzzle.

Sean

I can calculate slope and breakpoint adjustments for FP increase but am not sure if its necessary to add any latency to the offset table to account for the actual FP (55 psi) vs supplied offset values at 43.5 psi. Is there a rule of thumb for adjusting offset based on actual FP or do I simply need to use the supplied offset values and adjust as required?

Sean