Ugg. Why are the guys on corvette forum SOOOOO ******* stupid.. You can't even make a suggestion to these clowns without getting flamed and told "PCMFORLESS = GOD"..

retards..

-- Joe

 

maybe they are using for most part MAF that is more forgiving?

what year was the transition back to SD from MAF?

I thought I read some were converting MAF to SD but cant remember the particulars or advantages.

 

People have been tuning the 411 LS1 PCM MAF-less for some time now. I don't agree with it though. The MAF sensor is not a restriction, so why does it have to go? The MAF adapts to varying weather conditions more readily than a MAP system does.

 

MAP is cheaper, easier to tune. MAF is a little better with big cams.
MAP isn't so good with big cams, MAF isn't so good with airflow due to coding problems. The LS1 is not a thirdgen or a C4. apples and oranges..

If I could Repin my harness to use an LT1 computer & hei dizzy, I would.

-- Joe

 

I believe the MAF element is costly to replace? just a guess. If one increases the throttle body size one would need to buy a larger element? is that big bucks?
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why is MAF harder to tune?

 

The Thirdgen MAF TPI setup = JUNK

My 85mm GM MAF was $50 shipped on Ebay.

BTW, you CAN run the 411 PCM(LS1 PCM) on a 2002 Vortec 350 Van tune with the Vortec 350 distributer and crank sensor. I have run a TPI 305/4L60E combination with the 411 PCM from a Vortec van.

 

Cool, but doesn't help me much..... How do you run a 411 PCM with hei

-- Joe
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A bunch of MAF tables vs one flat VE table, for one.

-- Joe

 

That part is easy. I've already compared my 7730 schematic against and LT1 and the circuitry/color coding is extremely similar.


That's the part that takes a little creativity. Though I believe there are people working on such a conversion- sticking Opti guts into an HEI distributor. I forget who it was though...

 

My point is WHY?

The Vortec distributer will drop right into a conventional small block chevy.

Attached are some pictures of S10Wildsides TPI Vortec setup. I ran mine using a 2004 Astro Van harness and PCM with a few added wires for the V8 injectors and the PCM reflashed with a 2002 Express 305 tune (1994 G10 305 TPI/1997 4L60E).

 

And it's compatible with an Camaro/Corvette LT1 PCM? Shoot, my 96 Tahoe had a distributor.

 

NO, but it IS compatible with a LS1 PCM, which is even better. Ever heard of a little program called LS1 edit?

The 411 PCM (Repinned the harness) that runs my 1998 Express pulls down 20 mpg in that 6,100 lbs beast.

I plan to add the alcohol sensor to the tank and run the E85 programming in it soon in order to run E85.

 

What took you so long to figure that one out???

I too would liek to run the LT1 PCM mainly to keep the CCM happy..

As for MAP/MAF Y-cars:

84- MAP
85-89 MAF
90-93 MAP (90-91 L98, 92-93 LT1)
94-96 MAF & MAP (96 being OBD2 of course)

 

So what do you use for a crank sensor??

-- Joe

 

The Vortec crank sensor

You just need the ring that sits in front of the timing gear, the vortec balancer, and the vortec plastic timing cover with sensor. These parts cost me $15.00 at a wrecking yard.

 

Hrmm. so that '98 vortec block I have in my shop might be useful one day. (spun rod bearing).

If you can tell me how to get it to work with an LT1 ecm I might be interested. LS1 ecm won't do much for me right now I don't think.

-- Joe

 

Yeah I would be interested as well..

 

There is surely limitations with the MAP sensor and big cams. My cam has soo much overlap the resolution is horrible for tuning. I now see why a lot of folks like ski_dwn_it like MAF. Though MAF in the thirdgen/c4 form blows.

Say an ECM out of a late LT1 with both MAF and MAP would be great if it could run a HEI dizzy. The Sequential injection would be nice too as it has the cyl trim offsets which would benefit the minirams uneven air distribution.

Maybe I should call PCMFORLES. According to CF, he can do anything!!!!

-- Joe

 

This is why the Scan and tune board at CF is slow.. If I could run my vette off of an LT1 ECM I have the correct 92 CCM for it, then I get all the cool extra features.. I have even thought of building an LT1 as my next motor and just use my Miniram for the intake.. then use the Opti for the timing signals and get a delteq box for the LS1 coils.. Now that would be nice..

 

Hrmm.. Sounds sweet. CNP would be nice. Engine bay space kinda sucks though on our cars. The 92-94 ECM is prom based, but the 95-96 is flash based huh? I love tuning MAP but i'd like an additional maf for airflow calc and off TPS routines. The LT1 code is nice stuff though, looking at the options and tables.

I need to have a chat with you sometime about dash stuff. The atari dash has to go next. Seems like your quite a few years ahead of me at putting these cars where I want mine.


-- Joe

 

Let me know when you are ready on the dash stuff, I have a ton of info. Yeah MAF/MAP would be nice, but when you get to the 90-newer you have to deal with the CCM, I have a 91 CCM in my car and a 92 CCM on the shelf, both were bought new and i had them programmed (granted the 92 has about 5K less miles as I programmed it first to find out I had Serial Issues with the 91 ECM. (data was not what the 92 CCM wanted)

Anyway, I figured I could do the 92 LT1 ECM, and deal with the PROM Based system along with the MAP, then get some of the other features that the LT1 system had, Now if the 92 CCM I have will work with the 94 ECM, then I would got that route, but it is all the matter of getting it to work with the GEN 1 Distributor set-up.. I even have a F.A.S.T. eDIST to run coil packs from , but I don't think it would work with the LT1 ECM..

 

Whats the CCM ? Right now I have the '87 car which I did the body conversion like yourself. I repinned the harness to speed density and using a '730 ecm (fbody) under the dash. I havn't noticed if I lost any functionality dash wise.. But I didnt look too hard either.

My digital dash sucks. The tach barely works, digits are missing, etc. I'd love to transplant a 90+ dash if it's a sorta direct swap....

-- Joe

 

The 8D ccm code is in the hac.
Didn't look too difficult, but I don't have a ccm so I didn't look too hard.
At a glance, it looked like a selected ram dump.
If someone comes up with a junk opti, I'd be glad to work on the hei guts swap. We've got a mill at work and since I'm there 6-7 days a week.....

 

What I would be happy with is getting the 8D code to work with the 92 CCM..

Joe,

the CCM (Central Control Module) is the master on the serial bus ont he 90-later cars, it controls the LCD display on the dash as well as the some AC stuff and a few other pieces, it is also referred to as a BCM (body control module)

 

Im dumb and didn't know that. Does my '87 have a CCM/BCM hidden somewhere? Or were those functions run by the ECM and are now lost?

Funny, I recall having a conversation with the guy next door (shop next door) about a '96 vette a few months ago. he said it wouldn't start, and had a bad "body control module".. I thought he was crazy and just was like "oh yeah, wow, cool, glad you fixed it".. haha. i feel dumb now

-- Joe

 

No 84-89 had no CCM/BCM, it is standalone like the F-body. the CCM also controls, the OEM Alarm, VATS, Dome light timer, stuff like that.

Don't feel dumb, but if you forgo a CCM in a dash conversion you need something else for the dash cluster (or to replace the Fuel gauge and speedo in the LCD)

 

Maybe i'm better off doing a fbody cluster conversion like some of the other guys. Now I feel like an idiot since I threw out all my fbody clusters. ugg. I shoulda kept at least one.


-- Joe

 

Hey!!