BASSr

OKay,

I have my burner and TunerCat installed with the $32B definition file and can see data in the tables from the ABWN bin. This is getting scary as it almost sounds like I know what I am talking about!

Anyway, here is where I show what a novice I am. When I open the ABWN bin in TunerCat and open the tables tab, I am not sure where to start?

Here is what I have and what I would like to change initially:

'87 el camino with '87 Monte Carlo SS trans (200R4) and rear (3.73:1). Dropped in a rebuilt '88 IROC LB9 305 TPI in with following modifications:
- swapped stock heads out for L98 aluminium heads (intakes are 1.94" rather than stock 1.84" but still 58cc chambers so compression stays the same).
- put 21lb injectors (stock 19lb) in to compensate for additional fuel required for larger intake valves and cam.
- installed ZZ4 cam (lift and duration just a little more than stock LB9) to compensate for additional intake valve size.

Otherwise the motor is bone stock with Hooker headers.

Things I need to address immediately:

1. ABWN with 7165 ECM is making trans shift too early and go into lockup when ECM cable is plugged into trans. I disconnected the ECM cable from the trans and it shifts nicely but does not go into lockup. Need to address this in ABWN bin. I have a Hypertech chip from a '87 MC SS that I dropped a 400 SBC with same TPI (7165 ECM), so I am assumming that if I copy the correct table from that chip into what I have, it should work??
2. The motor runs very nice, but failed inspection for low end high emissions (running rich). I have R44TS plugs in and they look pretty good so I am assuming that the rich exhaust is because of the intake valves, cam, and injector modifications. What tables in TunerCat do I need to look at to start addressing this?

See the attached .jpg of the TunerCat ABWN tables.

Where do I start??

Bruce

BASSr

Hmmm,

No one wants to help me get started?

BASSr

Hmm,

Still no responses! Looks like there quite a few folks who read this thread but no one has suggestions?

Vader

First, the ECM (and binary) is not making the trans shift early. The TH200-4R is shifted solely by the balance between the governor and TV spool and sleeve.



The only thing the ECM does is to enable TCC at a given RPM, CTS, timer, road speed, LV8, and TPS. The 200-4R from a Monte should have had an alpha code of CZ-X ("X" being F, G, or another model year code). That transmission should have a 10-tooth governor with one medium and one light spring, making the peak shift point somewhere around 4,500-4,800 RPM. With a 3.73 axle that's going to be a lower MPH than you might expect.

If the TV cable is adjusted properly and the TV assembly is working correctly, normal part throttle shifts should be between 1,700-2,500 RPM, sliding higher as more throttle is applied. There are other variables in the transmission setup, but not in the ECM. Provided the VSS signal is applied to the ECM you'll need to scale the VSS for the rear gear ratio and set the TCC engage/release MPH in the program.

As for the high HCs at lower RPM, the larger injectors will require a shorter pulse width at part throttle. The injector constant should be set to the correct flow rate for the injectors AND the pressure you're running. The pressure will affect the flow substantially, and this must be factored. Simply changing the constant to "21.0" and then cranking up the FPR to 48 PSI will not have overall good results.

The base pulse width fuel (g/S) versus load (LV8) might be a good table to check. The open loop AFR versus CTS might also be a good table to check.

BASSr

Vader,

Thanks for the reply. This someplace to start.

The 200R4 (CZF) trans is matched to the rear as they both came out of the same '87 Monte Carlo, so I do not think there is an issue there causing the early shift points and lock up. What I do see is when I have the ECM cable connected to the side of the trans, the trans shifts early and goes into lockup. When I disconnect the ECM cable from the side of the trans, the shifts points are good but no lockup. This is all with the TV able adjusted correctly as I had a pressure gauge setup on the trans and I have 60-65 lbs pressure at idle and see it rise to around 130 lbs when I step on the throttle.

What $32b table should I look in TunerCat at to make changes to the injector pulses?

Bruce

BASSr

OK, sorry for the delay in getting back to this but work had meout of the country until late last week and could not focus on this.

Anyway, I still do not quite understand what tables I should look at for adjusting the trans? What I do see is that when the ECM cable is plugged into the trans, the shifs points are off and it locks up way too early. When the ECM cable is not plugged into the trans, the shifts points are just where they should be but no lock up. Any help here?

I'll look at the TunerCat tables for the injectors and I am sure I'll have questions there a well.

Hope you do not mind but will need some guidance here since you seem to be very seasoned with this stuff.

Bruce

RBob

iTrader: (1)

For the TCC lock up points, look at the screen shot of the Tuner CAT tables. Lower right has 4 tables that start with TCC. These are lock/unlock versus TPS% and MPH. They control when the TCC locks and unlocks under load.

For a decent write up on how the ECM handles the TCC, head up to the Tuning Guide Book sticky, chapter 5, '8746/'7747/'8063 ECM section. TCC logic is the thread.

I think that you are also confusing when the TCC locks with when the trans shifts. Nothing in the ECM controls the shifts points. It is all hydraulic within the tranny.

RBob.