- Mon Aug 05, 2024 7:46 pm
#69129
Hey everybody, I'm hoping to convert my car from a GM 165 Maf ECU to a speeduino.
This is a V8 TPI with 8 injectors wired in left/right banks. I believe this should go together
the same way a TBI system with the same 7 pin HEI distributor does but I want to be sure.
I switched from the 85 ECU to the 165 around 10 years ago (easy change). Burning proms
bothered me less than never being sure if the values I changed were really doing
what the tunerPro .Def file said it might be.
I was planning on using the flex fuel input for the VSS. The service manual states this outputs .6-battery voltage. I'm assuming I need a voltage devider for that?
I also have the stock knock sensor which also puts out too high of a voltage and wanted to set that up but was hoping for some confirmation.
My main issue, I can get the car idling/running alright with the module disconnected from speeduino control. With the speeduino connected timing jumps 5-8 degrees under 1200 RPM.
Above 1200 it jumps up/down 2-3 degrees around my target and thats how I've been setting the trigger angle.
I have checked with my timing light to verify my trigger angle and I've tried adjusting the base timing/trigger angle to try and get it working but I'm not having any luck. From the high speed logger it looks OK to me?
I have my trigger input connected to RPM1 and a DSC with the jumper set to TSC with the 5v pullup disconnected. I wasn't getting a signal when I bench tested it with the jumpers set to "direct" and the 5v pullup connected.
I've tried trigger filtering off-medum. I tried per-tooth timing on and dwell error correction on/off.
I've also been having some odd behavior at 1500 rpm. The "Idle ON" is always off until 1500 rpm, then it flips on/off and I can see the IAC load increase and the gama enrich jump up. this generally kills the engine and I can try getting a log of this happening.
Once I have it mostly running I'll share my wiring setup and put out the base tune for others. My VE is from the stock 90-92 l98 tune converted manually and some gaps averaged. The timing table hasn't been used yet but I took that from my last tune with the stock computer.
This is a V8 TPI with 8 injectors wired in left/right banks. I believe this should go together
the same way a TBI system with the same 7 pin HEI distributor does but I want to be sure.
I switched from the 85 ECU to the 165 around 10 years ago (easy change). Burning proms
bothered me less than never being sure if the values I changed were really doing
what the tunerPro .Def file said it might be.
I was planning on using the flex fuel input for the VSS. The service manual states this outputs .6-battery voltage. I'm assuming I need a voltage devider for that?
I also have the stock knock sensor which also puts out too high of a voltage and wanted to set that up but was hoping for some confirmation.
My main issue, I can get the car idling/running alright with the module disconnected from speeduino control. With the speeduino connected timing jumps 5-8 degrees under 1200 RPM.
Above 1200 it jumps up/down 2-3 degrees around my target and thats how I've been setting the trigger angle.
I have checked with my timing light to verify my trigger angle and I've tried adjusting the base timing/trigger angle to try and get it working but I'm not having any luck. From the high speed logger it looks OK to me?
I have my trigger input connected to RPM1 and a DSC with the jumper set to TSC with the 5v pullup disconnected. I wasn't getting a signal when I bench tested it with the jumpers set to "direct" and the 5v pullup connected.
I've tried trigger filtering off-medum. I tried per-tooth timing on and dwell error correction on/off.
I've also been having some odd behavior at 1500 rpm. The "Idle ON" is always off until 1500 rpm, then it flips on/off and I can see the IAC load increase and the gama enrich jump up. this generally kills the engine and I can try getting a log of this happening.
Once I have it mostly running I'll share my wiring setup and put out the base tune for others. My VE is from the stock 90-92 l98 tune converted manually and some gaps averaged. The timing table hasn't been used yet but I took that from my last tune with the stock computer.
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