Engine Dyno ? Fast 102 Intake MAF and 36 lb injectors

[dave w]

I can post up the ones (speed sensor) I use if you need them, fit any transmission with a speedo cable output.

I would greatly appreciate the speed sensor information!

dave w

[EagleMark]

Not sure how I can get VSS with no transmission on an engine dyno?

[dave w]

Not sure how I can get VSS with no transmission on an engine dyno?

Something like the 40 tooth per drive shaft revolution VSS pictured below, but mounted to the harmonic balancer. I'm thinking it would be 1:1 final drive ratio? Maybe it would be Transmission Input Speed Sensor (TISS) if mounted to the harmonic balancer?

dave w

[mecanicman]

Not sure how I can get VSS with no transmission on an engine dyno?

Without the speed signal you will run off of the idle timing table. Beyond that for the dyno it will be fine. You just have to transfer the timing table to high octane later. If it does not get a speed sensor, it will never run off of high/low octane tables.

[EagleMark]

I use the dakota digital sensor from summit racing, SEN-01-4160, its a 8000 pulse/mile , or 8 pulse/rev. This sensor is cheapest I have found anywhere at $39.00 from summit.

Thanks! I need a cheap VSS for the kids Toyota 22RE now on GM ECM and DIS!

Without the speed signal you will run off of the idle timing table. Beyond that for the dyno it will be fine. You just have to transfer the timing table to high octane later. If it does not get a speed sensor, it will never run off of high/low octane tables.

Since it will be run under load I'm thinking I should build a Park/Neutral spark advance table based on high octane table? They do have race fuel at dyno but car will be run on street 93 non ethenol fuel.

[mecanicman]

I typically make them all the same anyway. With cammed vehicles they dont like jumping from idle park to idle gear to high octane moving tables with different values. You just lose resolution running the idle spark tables.

[EagleMark]

But that is the only place the spark will be for now and no VSS.

Just found out the motor is a 2004 LS1 from GTO, not a 2002 Camaro.

MAF is 100mm MAF with a GM part no of 15864791 from a 2006 and up Z06 Corvette.

Wonder if one of these electronic builders around here could put together a VSS signal generator like they use on test bench to work as a signal?

[mecanicman]

But that is the only place the spark will be for now and no VSS.

Just found out the motor is a 2004 LS1 from GTO, not a 2002 Camaro.

MAF is 100mm MAF with a GM part no of 15864791 from a 2006 and up Z06 Corvette.

Wonder if one of these electronic builders around here could put together a VSS signal generator like they use on test bench to work as a signal?

Thats the ls7 card maf, you can put it any size tube you want. You will have to build the table for it cause its all custom and flows different in every setup. Just start with gto maf table and figure out the average percentage error for an area and multiply the entire table.

For your purposes on the dyno, I dont know if I would worry about generator. I dont believe it will hold you back any.

[RobertISaar]

Wonder if one of these electronic builders around here could put together a VSS signal generator like they use on test bench to work as a signal?

super simple to make a 555 circuit emulate a magnetic VSS. resolution of the potentiometer is kind of iffy at higher speeds though. one tap can send you from 40 to 80MPH.

i have most, if not all of the parts to make the 4046 VCO version for i think 6 different signals, but no functioning iron at the moment.

[gregs78cam]

Wonder if one of these electronic builders around here could put together a VSS signal generator like they use on test bench to work as a signal?

I do actually have one proto'd on a chunck of board. It can simulate both engine rpm, and speedo mph, seperately using two potentiometers. I know it worked for the '7427 that I tested it with, I would guess OBDII would understand it as well? You want me to bring it by sometime?

[mecanicman]

I use the dakota digital sensor from summit racing, SEN-01-4160, its a 8000 pulse/mile , or 8 pulse/rev. This sensor is cheapest I have found anywhere at $39.00 from summit.

[mecanicman]

Guess I should clarify, my comments are more meant for making it run in the vehicle. For the dyno it will be fine without speed signal as long as you realize its not using the high/low timing tables. Having the speed signal allows the pcm to switch modes from idle to moving. It can be made to run without speed signal, but I much prefer having one.