I am considering a WB for tuning my wot and throttle response, I will be using it in my 90 corvette.

383 tpi
stock L98 heads and intake with the ports cleaned up.
08-302-8 cam http://www.compcams.com/Company/CC/c...?csid=212&sb=2
headers with no cats, x pipe true duel exhaust.
auto with 3.07 rear.
7727 ecm
trick flow 24lb. injectors.

I am leaning to one of the aem wb at the time but would like advice on data logging with it, should I go through the trouble of wiring it up through the ecm to data log, I only plan on using it to data log and not install it permanently in the car. thanks in advance for any advice.

 

1

 

Ignore previous reply... somehow it got screwed up...

YES! Absolutely take the time to wire it up into the ECM.

AND, AND use the SAUJP_V5 adx and xdf files to do the datalogging.

With Tunerpro, SUJP, and the AEM WB, I export the data to a .csv file and then I can slice and dice the data to get the information I need to get everything dialed in exactly the way I want (and I don't have to be watching the WB while I drive and then have to remember what I saw later).

The only thing is you have to do some tailoring in Tunerpro to make it work with the AEM wideband. Check out the posts 44 through 46 in this thread on what you need to do.

https://www.thirdgen.org/forums/dfi-...-wideband.html


If you don't mind me saying though... you're shortchanging that 383's potential by a huge margin. Maybe it's budget related... maybe trying to keep stealthy for smog purposes... I'm not sure...

But factory TPI with that very small cam... it'll produce a horrendous amount of torque most certainly, but you'll be done by ~4500 rpm. The 3.07 gears also are not helping either...

 

ok thanks for the info I just need to figure out how to wire it to the 7727 ecm, i think I read somewhere that I could use the input for the egr.

 

That info is in the same link I posted. I think i used F14. You need to use one of the pins prescribed in the link for TP to see it.

 

OK but will pin 14 be the same on a 7727 ecm.

 

hmmm... not sure about that. Someone more familiar with that ECM may know.

 

I will poke around, the tuning section C4 corvettes is dead on the corvette forum thats why I posted here, I will post over there in the tech section and see if some still around that knows anything.

 

Pin F14 on the '7730 is pin C21 on the '7727 ECM. It is the MAP2 input.

RBob.

 

I will have to look at the wiring diagram for my ecm, Ok C21 in my FSM shows not used and the map signal is C22, I swear I remember reading somewere about using the egr but my FSM shows EGR SOLENIOD CONTROL PIN a4 so i am not sure if I could use that as an input.

 

I guess the other follow up question is whether Tunerpro knows to look at Pin C21 if it's scanning a 7727 ECM? The option bit WB OPT 2, bit 7 only allows you to set to A3 or F14

 

from what I have been reading you can make changes in TP so it can see it.

 

A '7727 is a '7730 ECM with different connectors and case. Both were used with the same $8D code between the f-body and y-body TPI setups.

MAP2 is not the same input as the stock MAP sensor.

Pin A3 on the '7730 is pin C18 on the '7727 ECM (TPS2).

RBob.

 

so what would map2 be for, c18 in the FSM I have shows not used, does that mean that it cant be used, I was under the impresion that if not used there was no circuit involved with that pin.

 

The MAP2 input isn't used in $8D, but the hardware is there. Just need firmware to support it, which is what SAUJP does. Same for the TPS2 input, and other inputs/outputs.

As another example take the truck TBI '7747 ECM. Trucks didn't get an IAT, the ECM firmware doesn't support it. But the hardware in the ECM is there for an IAT. Just need to change the firmware to use it.

RBob.

 

ok RBob so what your saying is use run the output from the WB to C18 then make changes in TP to recognize it.

 

If you wire to Pin C18 on the 7727, then it sounds like you have to set WB OPT 2, bit 7 to correspond to Pin A3. After that, do the tailoring in the posts in that link I posted above to get the voltage conversion correct.

 

sorry I took so long to get back answering this, just reread my post s, anyway the engine build was budget minded, I may upgrade the intake at some point if I can, the 3.07's work real well for what I use the car for, the original gears were 2.59's and they were only good for cruising down the interstate. thanks for the help finally got the wb now I just have to get in the mood to install it one day when the weather is bad I will install it.

 

I did have it at nemidia drag way once, it did 13.440@108

 

I finally found some time to install the WB, I was not able to get SAUJP_V5 adx to connect to my ecm, I believe it is because of the ccm in my 90 corvette.

 

Did you configure the com port in the preferences?

 

no I did not think of that, I will have to take a look, thanks.

 

com is ok in preferences, I have been using $8D-1227727-1990Corvette adx it connects with no problem I believe it has some way of automatically quieting the ccm.

 

Are you running the SAUJP XDF file as well?

 

Yes, I did see under edit definition silence cdm.

 

Hmmm... that's strange. Maybe someone who knows more about the 7727 ECM can chime in. I'm running that adx and xdf on my 7730 without any issues..

 

the ccm causes a lot of connection issues if you do not have a way to silence it.

 

Which also depends upon which BCC of $8D is being used. Not all support the CCM.

RBob.

 

I'm doing this same thing, however I am using S_AUJP v5 ,Innovate LC-1, and the 127727 ECU.
Shouldn't the, WB OPT1, b5 = Innovate LC1 (1-2V), be (0-5v)? Or does this output need to be reprogrammed?
Also, which pin to use on the 7727 for the LC-1 output is not clear?
Thanks!