Megasquirt ems

Uhcoog1,

Your research is correct, the logic output of the MS 3X will not directly drive the coils on the Hemi you need some ignition ignitors to do the job. Using Bosch 211 modules is probably the most elegant unfortunately it has a big downside though, as using two 211 ignition modules is expensive. They range in price from 49.99 for some new off brand 211s I found on ebay, or 49.99 for some used 211s that are genuine Bosch. Prices for new genuine Bosch units run about a $150.00 EACH! Yikes. The more economical option is to use 8 Bosch BIP373 DIY Autotune sells them for $8.50 Each. As of right now, I plan to use 8 BIP373. Obviously it takes a bit more fabrication and work.

Glen's Garage used to sell a nifty little board that facilitated using multiple BIP373. Unfortunately Glen's Garage is no longer in business, his website is still up, DO NOT SEND HIM ANY MONEY. I ordered a couple of his ignition boards, (total cost 21.00 so not a real big deal, but still irritates me), order is still pending several months later. GRRRR.

As far as throttle body sizing, I would be hesitant to go to big, as it can negatively affect throttle response. I took a caliper and measured the opening on the aluminum 6.1 manifold on my motor and it is between 84mm and 85mm. I don't see any point going 90mm, I chose 85 because I got it dirt cheap on ebay. If you look around you'll find that most ported throttle bodies for the Hemi are 85mm. The Hemi's cantered valve is so much more efficient than a wedge head that I don't think you need as big a throttle body. Hot Rod did a cam test in which they installed all three different Comp Cams hemi camshafts. Basically with the biggest comp Hemi Cam right at .550 lift, and set of headers, and the stock composite intake, the motor made 475 HP. The following month they added ported heads and were over 500. So I think you're well on your way to 500 HP.

Now if you are looking to save some money and are going to go with a small cam, under .550 lift you could go with a Hughes cam. They have a reground cam for only $199.00. You can see the cam here: http://www.hughesengines.com/Index/...3LzYuMSBNb2Rlcm4gSGVtaQ==&level1=Q2Ftc2hhZnRz
I've read a lot of nice things on the web, about the quality of Hughes products, FWIW.

As you can see in the above paragraph, even with a stock bottom end you should be right at the 500 HP level. Which from what I've read is about the limit of the stock pistons, anyway. The rods are allegedly good to 600, and the cast crank about 650. The top ring land on the pistons are so thin, but at the 500 HP level and no detonation you should be good. If you plan any NOS, I certainly wouldn't put more than a 100 shot of NOS, and would make sure that the mixture is rich. Now, if you are using the stock composite manifold, it will cost you a bit of HP, but I wouldn't despair, that plastic manifold is so efficient and good at making torque that your area under the curve is going to be higher with the plastic manifold than it would be with the aluminum single plane mopar performance manifold. You could also look for a 6.1 Manifold and port match it, to your 5.7 heads, although I've never seen them on ebay, they typically want around $600.00 for them.

As far as fuel pumps go, I really want to use an intank pump. HotRodCity makes custom aluminum gas tanks for Darts. They will modify the tank for an in tank pump. If I can afford it that's the way I'll go. As far as regulator, I will probably buy one from DIY, their prices seem to be very compettitve.

Regards,

Joe Dokes