I've been planning and accumulating parts for the new powertrain for my tow rig. I had planned on a Ford 5.0L stroked to 347 CI with a truck spec EFI setup and an MSII. My plans changed a little this weekend. I bought a supercharger kit designed for the intake system I planned to use at a swap meet. It's a Kenne Bell twin screw blower. I got a great deal on it and I'm thrilled. I think it will fit really well into my plans and needs for the truck.
All the important stuff and the original installation manual is there and in great shape, but a few of the misc. pieces are either missing or in rough condition. In reading through the manual, all the stuff that is missing or junk is designed to fool the stock speed density ECU into running the engine correctly and raising fuel pressure under boost to meet fuel demand. My thinking is that with the MSII, I can simply eliminate the FMU and all that other stuff, run a fuel pump and injectors that are large enough to meet fuel demand under all conditions, and tune it from there.
My concern is what the larger injectors will do to driveability. I'm NOT building a race motor here. It's a driver and a trailer puller. I need it to have excellent manners at idle and part throttle as well as lots of torque and power at wide open throttle. It will be limited to about 4500-5000 RPM max and I'm figuring on about 425-450 HP. I've calculated the needed injector size to be about 36 lb. The stockers are 19 lb. Will I have issues with the injectors being to large for a smooth idle and low speed operation or am I worried about nothing?
Fuel System Design for a Supercharger
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
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Re: Fuel System Design for a Supercharger
We've got a car idling fine on MS1 with larger injectors. 36 lb/hr injectors shouldn't be an issue.
Re: Fuel System Design for a Supercharger
Thanks, Matt. I figured it would be OK, but I try to plan for everything. I've also read that the resolution of the MSII processor helps alot when it comes to tuning with larger injectors.