MSD box with Fast XFI or not ?

[waynieZ]

I just bought a Fast XFI for my motor. 454 SBC stroker 600hp. My shift point is 6600 rpm. Will I gain anything with an MSD 6A box and this system? I was thinking the 6A because I don't need the rev limiter , the XFI will take care of that. I plan on using a Fast dual sync distributor. The car will be 99.9% street driven but I'm in over my head already so I might as well do it right the first time.

Another question is . I have 42 lb injectors (Their used but I will have them cleaned and checked) they should work for my engine ,but I was told be a tuner around my area. He would rather see 48 or 50 lb injectors on my motor. I was wondering what the opinions on this board were about it? Can I boost my pressure up or just get the bigger Fuel injectors? My pump is capable of 95 psi.

I started getting my fuel system together. I have a Weldon 1100A pump 135gph/0-95 lbs with aeromotive 100 and 10 micron filters and an Aeromotive 13109 fuel regulator . I'm going to run 10AN hard lines from an aeromotive sumped stock tank to a Y and bring the hose down to 8AN to the rails then 8AN to the regulator and 6AN hose to 6AN hard line back to the tank. Opinions welcome
Thanks Wayne

[GregWeld]

My 427 SBC (Dart block) with Imagine Injection 8 stack intake -- uses 42 lb injectors... and runs like a rapped ape...

I'm running -6 lines to the rails and regulator... and for the return.

I'm running 40 #'s of pressure.

[GregWeld]

Forgot about the MSD box question --

I just helped a buddy with his FAST XFI -- Imagine Injection 8 stack 454 BIG block - using a MSD 6 box -- works FANTASTIC....

We used the FAST to control max rpms... so the MSD has to have a chip that is a higher rated rpm.

My Accel Gen 7 EFI will control FUEL shut off and on... not sure if the Fast works that way or not -- I don't do the tuning part!

[waynieZ]

Thanks Greg

[wedged]

I've always used and recommended MSD stuff. Just recently I started using some Mallory boxes. I also have a FAST XFI system. I was pricing parts when setting up my 440 Dakota and discovered that I could get a Mallory box with more features dollar for dollar when compared to MSD. I was originally going to use a 6AL box, but opted for a Mallory Mallory Hyfire IV digital box. I believe i set the rev limiter in the box a bit higher than the XFI limiter, just as a back up. I went with this box instead of one with no rev limiter because I can use it as a spare for other cars if needed. I went with a Mallory distributor and coil too.

[waynieZ]

I just picked up an MSD 6a ignition box to use with my Fast XFI. Got a good deal on it $130. I can't wait to get my car back to get started on it.

[GregWeld]

People tend to forget what MSD stands for... MULTIPLE SPARK DISCHARGE...
This multiple strike below 3000 rpm (I think that's the number) works... Now make sure to use a GREAT coil!

None of this stuff is worth a damn without a GREAT COIL! That's where the juice gets juiced. LOL