7427 MPFI+MAF Setup

For everything related to using Fuel Injection in an FSJ.
WT91
Posts: 208
Joined: Thu Jul 02, 2015 12:00 am

7427 MPFI+MAF Setup

Postby WT91 » Wed Jun 14, 2017 7:52 pm

The details are in the title, has anyone here made the successful jump from a 7427 TBI setup to either/or a 7427 MPFI/TBI+MAF system? I am starting to get the TBI dialed pretty good and wanted to go MPFI, edelbrock makes a MPFI intake manifold for my motor so when I did the motor build I used the stock cast iron to save $ while we tuned out the bugs. I know the basics of converting the PCM to run 8 injectors vs 2, I'm just wondering if anyone had any real-life advice to add? I'm also looking to convert from speed density to a MAF based system either before or after the MPFI switch, so any advice in that area would be great as well.
:-bd
His:
1990 Grand Wagoneer (Toy)
440 9.5:1, XE250H Cam, Hedman Shorty Headers, '7427 TBI
727/208/D44 4.10 Locked F&R, SOA/SF, 33's, 12k Winch, Custom Bumpers F&R, OBA


1994 Ford F350 Crew Cab Dually
7.3 Powerstroke/ZF5 5 Speed/2WD 4.10 LS. Daily driver/toy hauler.

Hers:
2009 Dodge Charger 3.5L v6

FSJ Guy
Posts: 1676
Joined: Fri Mar 15, 2013 3:03 pm

Re: 7427 MPFI+MAF Setup

Postby FSJ Guy » Thu Jun 15, 2017 10:55 am

There is a write up on gearhead-efi.com IIRC.
Ethan Brady

http://www.bigscaryjeep.com

1987 Grand Wagoneer. Slightly longer than stock.

WT91
Posts: 208
Joined: Thu Jul 02, 2015 12:00 am

Re: 7427 MPFI+MAF Setup

Postby WT91 » Thu Jun 15, 2017 11:25 am

I will have to dig around more, I saw plenty of theory discussion but no legitimate writeup. I have read and re-read the MPFI discussions on binderplanet, but none of them talked about incorporating the MAF.
His:
1990 Grand Wagoneer (Toy)
440 9.5:1, XE250H Cam, Hedman Shorty Headers, '7427 TBI
727/208/D44 4.10 Locked F&R, SOA/SF, 33's, 12k Winch, Custom Bumpers F&R, OBA


1994 Ford F350 Crew Cab Dually
7.3 Powerstroke/ZF5 5 Speed/2WD 4.10 LS. Daily driver/toy hauler.

Hers:
2009 Dodge Charger 3.5L v6

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babywag
Posts: 812
Joined: Fri Jun 08, 2012 7:29 pm
Location: Land of Fruit Loops & Coconuts

Re: 7427 MPFI+MAF Setup

Postby babywag » Fri Jun 16, 2017 6:55 am

To my knowledge on an AMC, I don't believe so.
I haven't seen that setup. I've done just TBI+MAF.
There is a info about MPFI+MAF on several other engines though.

If you search for OD MAF MPFI it should bring up some threads for you.
-Tony
'88 GW (aka Babywag) '90 GW (aka JunkBucket) both fuel injected.

WT91
Posts: 208
Joined: Thu Jul 02, 2015 12:00 am

Re: 7427 MPFI+MAF Setup

Postby WT91 » Fri Jun 16, 2017 3:16 pm

I'm gonna be doing it on the 440 in the Wagoneer.
His:
1990 Grand Wagoneer (Toy)
440 9.5:1, XE250H Cam, Hedman Shorty Headers, '7427 TBI
727/208/D44 4.10 Locked F&R, SOA/SF, 33's, 12k Winch, Custom Bumpers F&R, OBA


1994 Ford F350 Crew Cab Dually
7.3 Powerstroke/ZF5 5 Speed/2WD 4.10 LS. Daily driver/toy hauler.

Hers:
2009 Dodge Charger 3.5L v6

User avatar
JeepsAndGuns
Posts: 129
Joined: Sun Jun 10, 2012 4:12 pm
Location: cullman, AL

Re: 7427 MPFI+MAF Setup

Postby JeepsAndGuns » Sun Jun 18, 2017 6:02 am

79 Cherokee Cheif. MPFI 401, T18/D20, hydroboost, otherwise stock.
93 YJ. 4.0, 5 Speed, SYE, hydroboost, WJ knuckles/brakes, 8.8 rear, OME 2.5in lift, warn M10000 winch. 31x10.50's
99 WJ limited. 4.0, auto, 2wd, stock.

WT91
Posts: 208
Joined: Thu Jul 02, 2015 12:00 am

Re: 7427 MPFI+MAF Setup

Postby WT91 » Mon Jun 19, 2017 7:48 am

I was hoping you'd reply JeepsandGuns, I read a lot of your posts. Since 2012, have you learned anything new that you would change in your setup? I saw you wired all injectors as left/right banks, didn't use a vacuum FPR, and ran with the neon injectors. I am planning on wiring it the same way, left/right banks, using the LS corvette style fuel filter with built in 58 psi regulator (non vac), and running ford 24 lb/hr injectors out of a DOHC 4.6 V8. My plan is to really understand the system with MAF first, then make the jump to MPFI as that is a less drastic change to the way the system operates.
His:
1990 Grand Wagoneer (Toy)
440 9.5:1, XE250H Cam, Hedman Shorty Headers, '7427 TBI
727/208/D44 4.10 Locked F&R, SOA/SF, 33's, 12k Winch, Custom Bumpers F&R, OBA


1994 Ford F350 Crew Cab Dually
7.3 Powerstroke/ZF5 5 Speed/2WD 4.10 LS. Daily driver/toy hauler.

Hers:
2009 Dodge Charger 3.5L v6

User avatar
JeepsAndGuns
Posts: 129
Joined: Sun Jun 10, 2012 4:12 pm
Location: cullman, AL

Re: 7427 MPFI+MAF Setup

Postby JeepsAndGuns » Sun Jun 25, 2017 5:45 am

The neon injectors ended up being too small for my 401. I swapped to corvette LS6 injectors (bosch 0280155931), I am also running a adjustable vacuum referenced fuel pressure regulator set at 45 psi. But this is for my 401. If using a setup similar to this, fuel injectors and fuel pressure will need to be chosen to match your engine size.
The injectors need to be wired as left and right banks, as this is a batch fire system, not sequential.
79 Cherokee Cheif. MPFI 401, T18/D20, hydroboost, otherwise stock.
93 YJ. 4.0, 5 Speed, SYE, hydroboost, WJ knuckles/brakes, 8.8 rear, OME 2.5in lift, warn M10000 winch. 31x10.50's
99 WJ limited. 4.0, auto, 2wd, stock.


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