Logging on OEM pcm some of the pressure sensors dont have clean readings. Is there some way to clean these up so they log a little more stably? The factory pressure sensors on these inputs are pretty stable
What you want is shielded and or twisted and shield grounded at only one end. This is known as a "Faraday shield." If you don't have / can't get shielded you can "scrape by" with something like CAT5. Use one or two pair for your sensors, and ground the other pairs at one end. They will act as a shield/ ground plane. Twisted cable IE phone/ CAT5 is done for a reason. If you can find some old exposed overhead phone/ telegraph wires, typically along RR, you will find a "twist" periodically at the pole insulators. There will be a group "box" of 4 insulators, where the wires cross over to form the twist. Like so:
The 4 insulators grouped at right about the 5th crossarm down
Had this issue once before. I would be focusing on the source of the noise.
Did this just start? Was anything changed around the same time this started? Non-resistor plugs? "Performance" wires or coils? Bad coil? Alternator? Any other electrical components recently added? In my case, it was the addition of IGN-1A coils and Firecore wires. The problem wasn't so much the coils and wires but the ECU not having sufficient protection. Drove me nuts and tried everything being suggested. Went back to OEM coils and a different wire and haven't looked back since.
If you have a scope, make sure supply and gnd signals are clean. If gnd noise, check for loose gnd or gnd loops (multiple gnd points vs common gnd pole). Best practice - make sure to not route sensor wires by coils or other higher speed switching signals. As mentioned above, twisted pair or better yet shielded sense signal is best.
There can never be multiple ground points as such for sensor wiring. They MUST all reference only to sensor grounds on the ecu which are dedicated for that purpose alone. If someone has connected to vehicle/engine/chassis ground that could result in noise or skewed readings.
Built a 6.0 for my 71 Chevelle bracket car. Basically a rebuilt gen 3 lq4 with stock crank, gen 4 rods and Summit forged flattops. Rotating assembly was balanced, block was bored .030 and decked. Factory 862 heads, no porting but gone thru with Trick Flow double springs, Summit 8702 cam, vic...
Has anyone ever swapped an LS-based motor into a newer Gen5 LT-based Camaro or Corvette? Heard the motor mounts are slightly different - what about bellhousings, input shafts, other things?
Have a line on a great LS-based motor, but not sure of the level of effort/headache to make it fit and...
Does anyone know a good source of a bent motor plate to put an ls in a current strut car with a bbc in it, using the same tabs? I see don oneal uses one for his camaro. Ive reached out to Haas, but was wondering if there is another source?
So has anyone ever taken off a Super Victor and installed a Mast 2 piece intake and veirfied et gains at the track or substantial dyno gains
Im looking to purchase one but am hesitant if they really make as much as a difference as some claim
For the money if it doesnt make 25-30hp or better...
I have a 200k mile LQ9 short block thats made about 10 passes since being put in my bracket car. It's got a a HVHP Melling oil pump and one of those Chinese 7quart pans with Rotella 10w30 oil.
Today pressure suddenly dropped from the usual 50psi at hot idle to an erratic 25psi and then to...