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I can't find my drawings and strobe pics from the early 1990's. A 3 bar plate works so much better to atomize the fuel. Think top bar with normal...

Thanks Fast355. not something I'd even thought of so will have a look and tinker a little, did you run the standard bosch marine injectors on your...

Quick Summary of the data log 1 dave w

The marine TB should be about 75mm if it is a 3 bolt Biggest thing it will change is the shift points vs engine torque and the line pressure vs...

Thank you both that's shed more light on the tune. the motor is a v6 in the astro and have the injectors set batch as original , no done memcal mod...

I don't have a tuned $OD 4.3 marine file to share. I can help with $OD Wide Band O2 sensor (WBO2) tuning:...

I think that STY clear memory from 1400-15ff. It looks like it copies the value from 1400 and stores it from 1400-15ff. 1400 looks like one of the...

HaHa, yepper, 100hp shot, yuck... start out at a 175hp shot :D

That they are! I am really enjoying the dual plane setup. I cleaned up the ports in the dual plane and opened the runners up to match the port...

I have done the L31 truck intake in the past starting with the 4.3 CPI tune setup. I moded the TBI memcal and bypassed the injector current sensing...

News is not the best: I tried all combinations first in $16F0 then in $16F2. These do not cause a read back into $16E0-8 addresses that are used to...

On second thought, it looks like this probably would not be adaptable for a 13.5V system. You would have to run 18.5V to compensate for the voltage...

Thank you for finding all that for me. Picture gets a little more clear Looking at read back of internals... First here is what I think the code...

This is from a 96 lt4 calibration. It might differ slightly in your case. The other config data is also very interesting but nobody knows what it...

The external injectors are the key so you don't have to rely on the "spider". I'll help what I can :)

FYI, it's not cheap. Decent used intakes were bringing big money, last I checked new ones were in the $1500-1600 range, and use a 4 bolt throttle...

Question for you, do we know how/where the gear ratio is set in the calibration? Given that the VSS is routed to the TPU and that the speedo output...

That is some serious progress here. I think the next step should be to try to read the full memory range of TPU from $0-$2000. That way we can rip...

Some success this morning working with the TPU. I first wrote a routine to load the TPU. Used the '97 flash routine with no mods. Seemed to load OK...

I'll refer you to page 20, post #288. But this one should be of primary interest to you guys. Note the stacking of the diodes. 5 diodes @1v...

PCM and electronic trans most likely provided a solid chunk of that gain. Did for me atleast.

I used blucats with a large learning curve, but I got it dialed in. This was just a better starting bin for higher gearing for a transmission tuning...

Might I suggest using software like Blucats to remap the transmission instead. Never was a fan of the TBI (or even Vortec) shift points at...

I thought you all might like that diode "bridge", it sure helps the o-scope stuff :) Carry on, I'm just listening but will help what I can whenever I...