supercharged 91 , pcm tuning list

[tpulliam79]

Alright as some of you may know I recently bought a 91 sse with the engine and transmission from a 92 ssei. The guy who started the build swapped the axles already and wired most of the engine to the pcm, now the fun part, I know now that the supercharger on it is from a 94/95. So now i either have to rewire everything to a different pcm , switch the supercharger to the correct one, or see if sinister can burn the 94/95 values into my 92 pcm. I am leaning towards the last option of having the pcm flashed. so far I know the maf values, fuel tables, shift points, fan on sooner, vats delete, anything else anyone thinks of please add it here. Once I hear back from sinister I will know where to start. In the meantime I will figure out all the dash wiring and swap the fuel pump and finish wiring the tranny towards the pcm. I have a lot to to to keep me busy but I am trying to get this thing on the road asap. thanks again for all the help and advice.

[J Wikoff]

I've got the 92 ECM pinout. I can get you pics if you do need them.

Which MAF and TB do you have? It'll be important to have the 94/95 to match the supercharger. And do you know what fuel pressure regulator you have? Take a look at it and look for a BAR rating. I think, IIRC, 92/93 is 3.0 and 94/95 is 2.5.

If it were me, I'd have SP do the 94/95 MAF/timing table burn, if it can be, and have him juice it up a bit.

[tpulliam79]

I've got the 92 ECM pinout. I can get you pics if you do need them.

Which MAF and TB do you have? It'll be important to have the 94/95 to match the supercharger. And do you know what fuel pressure regulator you have? Take a look at it and look for a BAR rating. I think, IIRC, 92/93 is 3.0 and 94/95 is 2.5.

If it were me, I'd have SP do the 94/95 MAF/timing table burn, if it can be, and have him juice it up a bit.

I do need the pinouts either way if you could send them it would be greatly appreciated. I have the 94/95 maf and throttle body from what I can tell, I will check the fuel pressure regulator and get back to you ( which one do I need?)
oh here's a link to the other topic for reference viewtopic.php?f=8&t=16296

[J Wikoff]

The 3.0 adds some fuel pressure. Should be better than 2.5, if you're getting tuned. I'll dig through my FSM pics and find the pinouts after dinner.

[willwren]

2.7 is stock for the 94/95 (close, John!), but if he re-tunes to the 94/95 tables, he'll want to run the 2.7bar regulator.

[J Wikoff]

Why go with the stock tables? Tweak them a bit, and compensate!

[tpulliam79]

thanks for the tables they are just what I need. also do you have the one that shows the wiring to the gauges from the pcm so once I get all the wires from the cluster labeled I will know where to put them? thanks again man.
Does anyone know where I could find the wire harness that goes from the transmission to the pcm, or is that something I will just have to wire in and loom up?

[J Wikoff]

I'll have to dig for those. Might be tomorrow night.

[tpulliam79]

I'll have to dig for those. Might be tomorrow night.

no worries thanks again. im sure i have enough to do to keep me busy

[2000Silverbullet]

So when is the mini Meet at Bill's?

.....but you probably need a month to get things in order.

[tpulliam79]

So when is the mini Meet at Bill's?

.....but you probably need a month to get things in order.

unless i get her up and running super quick the mini meet would have to be here in spokane for me to attend. I am going to start labeling all the wires to the cluster today. I am going by the manual but am also going to charge the batt in car find an accessory power and ground and test each wire to see what lights up. tomorrow or thurs its fuel pump day

[tpulliam79]

Yes, I can reprogram your 92 PCM's chip (mem-cal) with 94-95 fuel and timing settings so your engine should work fine with the 94-95 Supercharger. Deleting VATS and anything else you won't need shouldn't be a problem. I can also adjust transmission shift points, cooling fan turn on and off parameters, and rev and top speed limiters to your specs. Let me know if you are interested.

so this is the great response I got from sinister performance, now i need to start getting the list of all things needing to be changed in the tune, I will start listing what I think and please let me know all the things I am sure to miss and to add I want this car to be safe to drive around but as fast as possible
1 Vats delete
2 fuel settings- details?
3 timing
4 transmissiom shift points
5 cooling fan turn on temp
6 rev and top speed

Now I am not sure what I need most of these to be, I am assuming ryan will have a lot of this info , but would really appreciate all the suggestions or info anyone has.

[willwren]

1. No brainer, you know what you need.
2. MAF tables and Fueling from stock 94/95 L67 Bin file.
3. Timing tables from stock 94/95 L67 Bin File.
4. Shift points from stock 94/95 L67 Bin File.
5. Cooling Fan turn on is currently 220°F. Your choice from there.
6. Rev limiter (fuel cutoff) from stock 94/95 L67 Bin File. Top speed to 199.

[tpulliam79]

Alright i have a list of info i need and need some advice on how to figure some of it out.. sorry I know its la lot of questions but this is all the info sinister requested. I know some of it may be preference but would love to hear what you guys suggest as this is my first burn. also anybody have a pic of a 92 pcm?

1.injector size lb/hr, and how to tell for sure if they are from the 92/93 or 94/95
2.rear end or overall gear ratio ( 92 ssei axles)
3. how to identify if the speed sensor is from the 92 so i know if its stock the trans.
4 egr and evap systems disable or enable?
5 air pump would be n/a correct?
6 heated or non-heated 02 ( if more than one wire its heated correct?)
7 have them set fans to work best with whatever thermostat I am going to run or give them set temps?
8 desired rev limiter in rpm9 have them automatically set the idle speeds or give them numbers?
9 any trouble codes I should have disabled? ( remember no airbags )
10 leave tcc engagement stock or +/- how many mph ?
11. optimize part throttle shiftpoins ( performance or leave stock?
12 desired full throttle shiftpoints :____________ engine rpm?
13 shift firmness , increase, decrease , or leave stock?
14 torque management leave stock or decrease by ___________%?

[willwren]

1. Post the numbers (all of them) off of one. 92-95 L67's were the same though.
2. 2.97 for all L67's until 95.
3. Pull it and get the numbers. You need the one original to the trans for sure. The reluctor count changes by type of trans/diff.
4. Keep EGR and Evap. They both help you.
5. Correct, you don't have an air pump.
6. Non-Heated if you use the 92 O2 with the 92 pcm. The O2 for the 92/93 L67's was a single wire, non-heated.
7. Browse INTENSE and ZZP. See what settings they put into their PCM's.
8. Have them set that to the stock 94/95 L67 values.
9. That's going to be a tough one. Depends on what you find in your wiring that you have no component for.
10. With a stock stall (converter), don't change it.
11. I'd leave it stock 94/95 L67 for now, change later if you have no debugging to do. Get the car running right first. You can get a second eprom burned later to swap in with other stuff.
12. From the stock 94/95 L67 Bin File.
13. Leave stock. That's for a shift kit or a modulator. You know that game. That gives YOU control to change it at will.
14. The 92 doesn't have TM. Shouldn't even be in the PCM.

[J Wikoff]

Are you going to wire in the perform/normal shift switch? Keep in mind, the default shifting is the performance mode, and the normal mode "retards" it some.

[tpulliam79]

Are you going to wire in the perform/normal shift switch? Keep in mind, the default shifting is the performance mode, and the normal mode "retards" it some.

I have the switch for the normal performance shift mode, I am going to try to wire it in if possible, what would the advantages be of having it and any disadvantages if I dont?

[J Wikoff]

Normal mode is also an economy mode and should help city MPG's some by aiming for higher gears sooner than perform mode.

Just remembered, I forgot to get the gauge wiring last night...

[tpulliam79]

Normal mode is also an economy mode and should help city MPG's some by aiming for higher gears sooner than perform mode.

Just remembered, I forgot to get the gauge wiring last night...

no worries i have so much to do its almost overwhelming, but I am buying a truck today ( no soup guys hands were sghaking so bad it made me look a little deeper at the engine and found it using coolant internally )so I can take my time and enjoy getting the bonnie going instead of being pressed for time. ( i need a truck either way)
if anyone has the wiring connector or harness for the shift button or that go from the trans to pcm harness I would gladly buy them. I'm sure I can just hard wire them if need be. are there any disadvantages to not wiring the shift button in?

[tpulliam79]

alright there are 2 pcms in the car and I think i know which one is the 92 but want to be sure, the 92 is the one with 3 plugs right? the other one only has two and is smaller. if anyone has a pic of a 92 pcm it would be greatly appreciated. nevermind I found pics on rock auto.