I'm going to get more of the water neck spacers built. I sent a CAD file out for quotes so I should have parts on my website in a few weeks. [/quote]

Great Andy I'll take one.

Mike

Yep, I want one too Andy.

Good deal! I'll have to keep an eye on the site and place an order.

Can the base sniper efi be upgraded to the Super Sniper 650 with just a software program update to use it with nitrous or blow through?

Thanks

Car Craft article: https://www.hotrod.com/articles/super-sniper-efi-sees-powerful-improvements-data-logging/

Still creating a list for water neck spacers Andy? I'll take one.

Thanks!

I'm in for a spacer too Andy, keep us posted.

Was just looking at the Holley website, and the description for the Super Sniper 650 indicates "Progressive or Non-Progressive control strategies". Did they already add this feature for progressive throttle plates since the article was written/published, and have you tried a software update?

I think that description on the website refers to nitrous control.

Holley marketing was very specific with me when I wrote the article. They do not want people using a progressive linkage on the Sniper.

Doh! Guess it was too much wishful thinking...

I got the impression that support for a progressive throttle linkage will be coming along in a future release. Holley had progressive linkage on an earlier throttle body so they know how to do it, I guess they just left it off the first version of the Sniper.

Current Terminator throttle body use progressive linkage. I assume that price point, and limited space with the Sniper system are a few reasons for limited abilities.
If the sniper had all of the capabilities of the Terminator, no one would buy the higher end systems.

I have the engine running with the Hyperspark ignition and so far it seems like an excellent upgrade over the MSD distributor that I had in there.

The Hyperspark ignition has full computer control so I can dial in whatever advance curve the engine needs. Idle performance and low speed driving really improved by adding a little more timing. With the MSD distributor I was limited to 16 degrees initial and 18 in the can for a total of 34. By getting rid of the mechanical setup now I can dial in whatever I want. I started off with 20 degrees at idle and kept the 34 at WOT. The few extra degrees at idle and low speed really smoothed the engine out. Manifold vacuum increased from 12 to 14 inches and the engine is using less fuel with the extra advance.

I still have a bunch more tuning to do but so far I'd say it is a major step forward.

I've been out on the freeway driving the car and it is amazing how much less fuel the engine uses with the extra ignition timing. The MSD distributor that I had before did not have vacuum advance so I was limited to 34 degrees total going down the road. Now with 40+ degrees at cruise speed the fuel consumption is reduced by 30%. That is a big savings in gas. It was using around 40 lbs/hr at 75 mph and now it has dropped below 30 lbs/hr at the same speed. It isn't going to be a fuel economy star but now I should be able to take it somewhere without always having to look for a gas station. If I can get 15 mpg on the freeway I'd be happy. I typically don't drive it more than 30 or 40 miles anyway but maybe if the mpg is better I might take it on longer drives.

Andy, since there is no vacuum pod with the Hyperspark distributor I'd guess you manually add the extra timing for cruise? Or, are there a pre-determined curves built in for various situations? How is timing handled in general?

There is a timing table in the software which you can edit. Basically I have 19 at idle, 34 at WOT and 42 for freeway cruising and then smoothed out between those areas.

If you want to get really tricky with it you should be able to set up a lean burn timing/fuel curve scenario for light throttle cruising.

Kevin

I added the digital dash and built a new console panel for analog gauges. Most of this is temporary, I'll figure out what I want long term in the car some other time. But for now I can watch the EFI sensors with the digital dash and I have duplicate analog gauges for the important stuff.

Got some runs on the chassis dyno today. Made 485 rwhp and 525 ft-lbs. Not bad for pump gas, hyd roller cam and cast iron exhaust manifolds.

Everything ran great on the dyno but there is some room for improvement. The AF ratio goes off at the start of the run so I need to work on the enrichment table.

Video of one of the chassis dyno pulls: https://youtu.be/xG3-_YJGdZ8