My first EFI on a new stock 440 build with a mild cam. Holley Sniper, Hyperspark, ignition, coil the works. We have put about 75 miles on it. I was hoping someone here has plowed the base timing table ground. Settings are for start; idle; cruise; and WOT. Any successful experience would help. Thanks Phish

Just use a normal timing curve. Maybe 15 at idle, 35 at WOT, 42 at cruise. Fill those blocks in and smooth the table. Are you using the handheld to enter numbers or have you hooked up a laptop? If you use the handheld you end up with a really blocky table. Best way is to hook up a laptop or pull the SD card and program it on your desktop computer.

I watched a Youtube of that. We used the handheld to get it going. May bring it to a chassis dyno as well as smoothing the table. Thanks

Not to hijack but does the Holley sniper work well with a dual plane intake? I'm running a Eddy RPM on a 470. I've heard both ways. Let us know what you think of the system. Thanks

No problems with a dual plane intake. I think every one of the aftermarket EFI systems I have installed have been on Dual plane intakes, Never had any issues.

Here is a video of the Sniper setup in my Coronet. This is a low deck pump gas 512 engine with an Edelbrock RPM intake. It seems to work just fine. https://www.youtube.com/watch?v=xG3-_YJGdZ8

Page 50 of the Sniper xflow manual says the idle, cruise and W.F.O. timing will "be blended together automatically". If you hook it up to a laptop, and have someone available with the know how, you may be able to improve upon it for your application. It also says that changing one of the values will raise or lower the curve in that area. I figured they took engine vacuum and r.p.m. into consideration when making the "curve"

The Holley software does a very poor job of building a timing table. I highly recommend using a computer to smooth the timing table. A laptop is a nice way to do it since you can sit in the car and make changes as the engine runs, but it isn't required. The SD card can be popped out of the handheld and inserted into a desktop computer which has the Holley software. After the program is changed the SD card is put back in the handheld and the new program is uploaded to the Sniper.

Imo, one of the best features of that system is being able to make your own timing and fuel maps on the computer, and how easy it is to do.

Thanks guys!

On my sons car we did just as Andy said. Put the base idle and cruise along with WOT timing and then pull the card and put it in the labtop and fill the blocks to make a great timing curve. When we first had it running before we filled in the full timing curve and drove it you could feel the timing jump from idle to cruise but we pulled the card and put it in the labtop and figured out how to make a good smooth curve filling in all the blocks. And then you can always modify more as my son is always tweaking his to get it perfect. Course we will be changing his a lot since its getting supercharged this year. Ron

Is 42 at cruise correct? Or a typo. Thanks

I am not Andy, but yes 42

This is the small table on my 512 Mine uses the 56 & up KPA

42 at cruise seems like a good place to start for your engine. Just think of it as the vacuum advance.

My dash reads everything, this is cruising down the Freeway

How many inches of vacuum or pounds of manifold pressure is 64.1 KPA?

Depends on the elevation but at sea level it would be around 12 inches of vacuum. At sea level kPa is a 0 to 100 scale while vacuum is 0 to 30 in hg or 0 to 15 psi.

Not sure what your real question was. Do you think 42 is too high or too low? It is fairly common to run more than 42 at cruise but I suggested 42 as a starting point. With a Sniper you can drive down the freeway and adjust the timing to find out what it really wants. Your combination might want 45 or 47 or 50 degrees of total timing while cruising down the freeway. All depends on the engine and the car.

I will be back with the car Monday. A local shop has a chassis dyno with associated Sniper software etc that I MAY use. I will try your base numbers and drive around some and may smooth the chart myself if I can figure out how to get a copy. (I HAD peeps). Or bring it to the dyno shop ( which has mixed reviews). Not trying to rotate the earth, just a daily driver. FYI I had cruise set at 20 degrees so don't throw me under the bus. LOL Told you it was my first one. So far I love it for cold start etc. Stephen AKA Jake

PS Ignore camera date, need to get Granddaughter to fix that
UPDATE, I have the software downloaded!!!!!!!

Just shy of 19.

http://www.kylesconverter.com/pressure/kilopascals-to-inches-of-mercury

Kevin