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  #41  
Old 11-12-2011, 09:26 PM
FSJ Guy FSJ Guy is offline
 
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I've been going through the $0D code. WOW!! Lots of COOL stuff! I'm really liking the table that will pull timing as engine temp goes up. The 7747 ECM was missing that and I could really use it!

Am I right in thinking that this PCM has a rpm and speed limiting function???
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1987 Grand Wagoneer, slightly longer than stock.

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  #42  
Old 11-13-2011, 08:10 AM
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JeepsAndGuns JeepsAndGuns is offline
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Quote:
Originally Posted by FSJ Guy
Am I right in thinking that this PCM has a rpm and speed limiting function???

Yep, sure does! Its called engine overspeed protection. Cant remember exactly where it is at, but just scroll slowly and you will find it.
It has a rpm and speed limit to it. It will shut off fuel when it reaches those. The bin I am using is set to cut off fuel at 4800 rpm. And speed is set to cut fuel at 96 mph.
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79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
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  #43  
Old 11-13-2011, 12:29 PM
FSJ Guy FSJ Guy is offline
 
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Quote:
Originally Posted by JeepsAndGuns
Yep, sure does! Its called engine overspeed protection. Cant remember exactly where it is at, but just scroll slowly and you will find it.
It has a rpm and speed limit to it. It will shut off fuel when it reaches those. The bin I am using is set to cut off fuel at 4800 rpm. And speed is set to cut fuel at 96 mph.

Found it. I just wasn't sure that was what it really was.

I can use it as a "theft" mode. Set it to 2,000 rpm and 20 mph! LOL!!!

Whoever created the XDF rocks! He or she set it so that you can show just the main parameters, all of them, or anywhere in between. Very nice for noobs like me so I can actually FIND what I need to adjust.

My motes adapter stuff should arrive Monday. I'll have to wait until next weekend to splice in the harness.
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1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #44  
Old 11-13-2011, 06:49 PM
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JeepsAndGuns JeepsAndGuns is offline
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Yea that little feature is pretty nifty. Select all levels for everything, or only level 1 for the most commonly used and changed settings. Weeds out a lot of the stuff you dont need, or should not change.


For noobs that are reading, just because you can change something, doesnt mean you should. Research before you just start changing stuff and punching in numbers. If you dont know what your doing, you can really mess something up.
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79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
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  #45  
Old 11-14-2011, 10:38 PM
FSJ Guy FSJ Guy is offline
 
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Location: Colorado
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My stuff from moates.net came today!!!!! Quick shipping as always!

I sprung for the GP3 switching adapter since I already have the EX remote. A very nice product and it fits perfectly!

I will be spending this weekend switching over the connector plug. There's no turning back after that, I guess, huh?

Here's a question for the collective:

There are several different values for base fueling. (No, that's not the question!) Under Engine Constants, there are Injector Flow rates for TBI, CPI and MPFI in lbs/hr as well as gms/second.

Do I change ONLY the TBI lbs/hr constant or so I need to change all or some of the others, too???

I currently am running 80lb/hr 454 injectors.
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1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #46  
Old 11-15-2011, 06:50 PM
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JeepsAndGuns JeepsAndGuns is offline
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No, change only the one for TBI, because thats what you are running with that pcm. If you are running mpi, or cpi, then you would change those.
All I had to change was the injector flow rate. The other one (grams/sec) was automaticly calculated when I put in the flow rate.
You will need to know what your injectors are flowing for the psi you are running. And if I remmember correctly, its the flow of only 1 of those injectors. I cant remember. But I think its in the comments box.
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79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
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  #47  
Old 11-15-2011, 07:19 PM
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babywag babywag is offline
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Bah, you guys and those 401's with big injectors...
Makes me envious.
I didn't have to change it for my lil' 'ol 360 engine

Anyone planning on using a wideband with their 7427?
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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  #48  
Old 11-15-2011, 07:44 PM
FSJ Guy FSJ Guy is offline
 
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Quote:
Originally Posted by JeepsAndGuns
No, change only the one for TBI, because thats what you are running with that pcm. If you are running mpi, or cpi, then you would change those.
All I had to change was the injector flow rate. The other one (grams/sec) was automaticly calculated when I put in the flow rate.
You will need to know what your injectors are flowing for the psi you are running. And if I remmember correctly, its the flow of only 1 of those injectors. I cant remember. But I think its in the comments box.

Perfect. That's what I needed to know. Thanks!
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1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #49  
Old 11-16-2011, 05:10 PM
FSJ Guy FSJ Guy is offline
 
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SUCCESS!!!!

Well, as in I didn't fry my new PCM or any of my existing sensors.

It wouldn't run when I carried over my existing fuel map and injector flow rate so I plugged in the Chevy 350 fuel map and flow rate and got it to at least idle (poorly) and move out of the garage.

I have no datastream, but I think that's due to Howell switching the data lines in the original harness. I may just bypass the harness completely and go right to the ALDL port.

And I must've turned off the correct flags because the CEL (Check Engine Light) stayed off.
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Ethan Brady
1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #50  
Old 11-16-2011, 07:15 PM
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JeepsAndGuns JeepsAndGuns is offline
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Only thing I carried over from my 7747 bin was my timing table. The 7427 does fuel diffrently, and has two tables. So all I did was smooth them out just a little. Definately keep the correct cylinder volume and injector flow entered into the bin so it can correctly calculate the injector BPW, then keep the stock chevy fuel tables and adjust from there.
I didnt have to swap any wires on the aldl plug?
When I first tried mine, I could not get aldl connection (tried before I even started) and the fuel pump came on and never shut back off. I did a little checking and found out I had put the eeprom in backwards.
Just remember 7747, pin one goes twards the middle of the ecm, on the 7427, pin one points to the outside.
Once I put the chip in right, it fired right up and instantly ran WAY better than the old 7747 did.
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79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
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  #51  
Old 11-16-2011, 07:26 PM
FSJ Guy FSJ Guy is offline
 
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According to diagrams on the internet, I need to move the data feed from Pin E to Pin M (right below Pin A).

Any hints on how to remove the pin connector? I've been fiddling with the paperclip I used on the ECM connectors but so far am having no luck.

I'll check the ads file and see if I can't tell it to look at a different pin location, too.

It idles really nicely with the Chevy 350 fuel map and the injector rating set correctly at 81 lbs/hr.
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Ethan Brady
1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #52  
Old 11-16-2011, 07:35 PM
FSJ Guy FSJ Guy is offline
 
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Well, I got the pin moved to position M, but still no data stream. :-( I tried it with and without the 10K resistor. I will continue poking around.

UPDATE: Poking around was successful!!! I had to go into Preferences and play with the data stream settings. But now I've got datalogging!!!

Compared to the '7747 ECM, it's awesome to see the gauges and flags change INSTANTLY when they actually happen!
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1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.

Last edited by FSJ Guy : 11-16-2011 at 08:09 PM.
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  #53  
Old 11-17-2011, 06:44 AM
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JeepsAndGuns JeepsAndGuns is offline
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The faster datastream is awesome! Its like you finally got all the molasses cleaned out of the wires....hahahahaha.
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79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
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  #54  
Old 11-17-2011, 04:49 PM
FSJ Guy FSJ Guy is offline
 
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Even after one datalog and adjustment to the the fuel tables, the difference is night and day!
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1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #55  
Old 11-17-2011, 07:10 PM
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Revhendo Revhendo is offline
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God I hate you guys. Looks like a trip to the pick a part in my future.....
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1988 Grand Wagoneer. Going for the ultimate fishing rig.
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  #56  
Old 11-17-2011, 08:10 PM
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JeepsAndGuns JeepsAndGuns is offline
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Quote:
Originally Posted by FSJ Guy
Even after one datalog and adjustment to the the fuel tables, the difference is night and day!

I couldnt believe the diffrence myself either. I was like wow, there is a very noticeable diffrence here. Couldnt believe it was from just the pcm.

Told you you wouldnt be disappointed with the swap
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79 Cherokee Chief 401/T18/D20, MPFI fuel injection, hydroboost, otherwise stock.
Future mods: Caddy 500/NV4500/NP205, HP D60 front D60 smooth botom rear, 5.13 gears, 35x12.50's on H1 beadlock wheels. Warn M12000 winch.
93 Wrangler 4.6 stroker/AX15/NP231,SYE,CV, OME 2.5 lift, front hub conversion/big brakes, 31X10.50's Warn M10000 winch.
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  #57  
Old 11-17-2011, 08:41 PM
FSJ Guy FSJ Guy is offline
 
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Tomorrow I'll take it out on the interstate and get it up to 75 mph. In town, I've only got BLM data up to 2,400 rpm or so.

I wish I could drive it to sea level, too, so I can get valid data for the higher map areas. MAP reads 85 with the key on, engine off at my elevation (~5,000ft).
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1987 Grand Wagoneer, slightly longer than stock.

www.bigscaryjeep.com

Don't mess with me. I once killed a living hinge.
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  #58  
Old 11-18-2011, 02:52 PM
Bill USN-1 Bill USN-1 is offline
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I think you guys are blowing it up to be a little more then it really is.
The conversion is nice in that it allows for more future options like electronic trans and such. For an engine with a big cam the idle tables do allow for improved idle. The faster baud rate is a plus when tuning. Elec fan control.

But if the 7747 ECM was tuned properly then the swap to the 7427 PCM with the same good tune is not going to show a performance improvement.


So while it is something new to play with, it really makes no "performance" gains.

So if a guy already has an ECM based TBI system running fine on his basically stock engine and no real plans to go to an electronic overdrive trans in the future, then the only reason to swap is to have something new to play with.

Just don't want every guy reading these, thinking it's something he needs to do.

But learning new things is always a plus.
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  #59  
Old 11-18-2011, 03:02 PM
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babywag babywag is offline
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My eventual goal for doing this swap is to also control the 4l80e I have sitting on the side of my garage.

Staying with my 7747, would have required an addition TCM or a standalone unit.

If I ever get enough $$$ stashed away for the adapter kit I need that is.
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'88 GW (aka Babywag) and '90 GW (aka JUNKbucket) both fuel injected
1994 Caprice wagon
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  #60  
Old 11-18-2011, 05:05 PM
FSJ Guy FSJ Guy is offline
 
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I see your point, Bill. But for me, having essentially "real-time" data is a performance boost all by itself! And I like how the PCM adjusts timing to help control idle speed. That's a nice touch.

So now when something goes wrong, I have loads more data to look at before I scratch my head and wonder "Wow, I still have no ideal what just happened!"

I would still recommend the 7747 computer for someone just starting, however. It's a little "easier" to jump into.
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Don't mess with me. I once killed a living hinge.
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