Ok! I decided to move up to fuel injection from my well sorted out 4 bbl Holley setup! I am keeping the Racing Beat intake manifold and will be using a Auto-Nomics 4bbl throttle body capable of 750cfm, with 4 - 55 lb injectors. My plan is to eventually turbo the car, but for now it will remain NA. The car is strictly a SCCA Solo II Car and will not see any road use.
E6X
Engine is a very early 13b with mild street porting
TB Plates all open at the same time, not progressive or staged
I will be running a stock CAS and stock RX7 Coils.
Exhaust 2 2 ¼” pipes merged at rear of car to a 3” collector, Borla SS muffler and Moroso Spiral tuned muffler (still way to load)

My questions are as follows:
I plan on using a 1 bar MAP sensor for load sensing, should I consider TPS load sensing?
I have been considering staged injection hopefully to help low speed driveability, should I consider batch injection?
I have found a lot of maps for turbo cars and nothing for NA cars, does anyone have a NA map that works and is willing to share?
Does anyone have insight on the ignition maps for NA vs boosted?
Thanks,
Paul

Pics
http://www.pbase.com/pshaver/midget_rebuild&page=5

 

I have a test map for E6X for NA applications, but its for ITBs not a Holley 4bb. Timing i would say is on the conservative side even for NA. I guess you can later bump it to try and find more power after you get the car running. Let me know.

 

I setup something similar last summer. Used a TWM TB on the RB manifold. Stock ports. I was worried having to use Alpha N load sensing but the MAP sensor worked great. No issues at all. I'd say if your port configuration is not extremely radical you'll have no problem getting the MAP sensor to work.

If you do run into a fluctuating vacuum pulse at idle you can try to use the zero throttle map with the MAP sensor. This basically disregards the MAP sensor for idle (0% throttle) and fuels as through you were using Alpha N. Once you crack the throttle you're back to MAP sensing.

The car I set up ran four 440cc injectors and I ran them in batch fire. Idle is your only concern and it idled great. I saw no reason to fool with staging when the idle and throttle response was so good.

As always, I recommend you not even fool with someone else's map. All engines need to be individually mapped anyway no matter how similar the setup. Getting the tune close enough to start isn't hard. Once you get it running you'll begin tuning so there's not much point in using something that may or may not be "close".

 

You are 100% right, its so much better to set up something specific for what you have. Its just a rough starting point that we provide as is with all maps. Whether or not someone can make the best of a base map is entirely up to them.

But i agree with your all the way with your comment.

 

Thanks for this replies, it makes me fell better about the using the 4 - 55lb injectors and the map sensor. My previous engine was a half bridge port, it would not idle smooth at all. This engine idles great as the porting is pretty mild.

What is the max ignition you would run on a NA engine with 91 - 93 oct pump gas?
I have pieced together a map from alot of different source, all these maps were for turbos. I am thinking I could probably run a more agressive ignition map with the NA setup.

Claudio, If you wouldn't mind I would like to take a look at that map you mentioned, if nothing more than a sanity check.

Thanks again,
Paul

 

With stock ports you'll find best power around 25-27* total advance at WOT. We've run them up over 30* on the dyno on 87 octane without knock. If you're porting is indeed fairly mild I'd use 87 octane, start around 23* total advance and then move to the dyno to find the sweet spot.

 

Thanks!
I have the the haltech, cas, throttle body/inj, sensor and setup and functioning on the bench. I start tonight with the rip up and install
Paul

 

Sure, PM me with your email or email me and ill send it to you.