4000lbs 57 Chevy Station Wagon, we just do a lot of spinning tires and want to get it to drag strip. Its a street machine with race tune. No problem with driveablity. There is no load and is not much WOT , maybe only 8 seconds . Bought a short block all built to hold 1000hp. Rods, .20 over Mahle pistons flat top with releif, Wagler Alt fire cam with springs and retainers,Roller rockers, Mild ported Heads, over size up pipes and Manifolds , 480/366 turbos, 100% bosch injectors from Lincoln, Duel injection pumps, twin 4’’ pipes. Had it tuned with 60% injectors , now running 100% over injectors. Have run it this summer on 60% tune and it runs crazy good and sounds great, no knocking and runs free. Hits 4000 rpm quick. With 60’s street tires sideways at 85 third gear lockup torque convertor. It is a little smoky, blackish haze up through rpms. Of course quite Black at take off so thinking on backing things down especially idle and up to maybe 2500 RPMS. Top end it seems to be ok .IT runs smooth and quiet compared to some other tunes i have run. just do not want to blow it up. Thinking pulse width shortened and little less fuel. Other wise the tune is Sweet. If I can back it down a little and it still runs good I will take it to a dyno to see where it is at. I was told with these turbos lucky to see 900 hp. I have injector flow sheets so will see if I can figure things out. Any Input would be appreciated.To a certain extent, EGT is what it is. When you burn a given amount of fuel, there is a set amount of heat energy that is generated. Some of that heat is transferred into energy that forces the piston down the bore, some is absorbed by the cylinder head, block, and piston, and some is expelled out the exhaust valve. I wouldn't be too concerned overall about exhaust temperature (especially during short bursts such as drag racing). I like to watch coolant temps and oil temps to see what sort of thermal load the engine is under. When you are loaded and working hard, you will see those numbers climb even if EGTs are in check. That said, you will generally see more power, when you burn as much fuel as you have available. You can overfuel to the point of cooling the combustion chamber and "put out the fire", but that is pretty hard to do on a common rail without some massive injectors and high pressure supply. A lot of tuning has to do with what parts are in the build and what the goals and uses are for the truck. Can you give us some details about what you're working with?
I'm in agreement here especially with the love hate relationship part. playing with it can leave one confused or frustrated. takes a lot of tweaks and testing to get it working good. that's why most will leave it alone or max it out and then adjust the PW tables but this can still create times where it's still smoky. get the B0795 right and it can be as clean as you want anywhere in the powerbandB0795 is the fuel limiting table and it will be key to cleaning up the way it runs. I have a love hate relationship with this table. For me it's been hard to get that table just right. Been years I been playing with it so I'm not losing performance long, but it still runs clean. If you search that table you'll find some post discussing it.
If you're happy with the way it runs I don't know if you really meant need to mess with much in the tuning aspect other than this table.
I agree. Going to do litttle steps first, try to get idle and low rpm a little less smokey or hazey. Adding little timing and a little more FRP to see results. Let ya know what happens.If you're going to play with the MAF limiting table, you need to do a lot of data logging to see exactly where adjustments need to be made. I do not recommend maxing that table, or you will have a smokey mess.
Im running it now and is not really smoking at idle. Just a little strong for lungs and eyes while idling. Maybe thats just 100% characteristics.. Pressure at idle around 5000psiIdle smoke is typically more fuel pressure and timing related than anything else. Sometimes pilot injection can have an affect on that as well. What sort of rail pressure are you running at idle?
My mAF Sensor keeps going to 0 so Im not getting fuel. Checked wires and New sensor. Think can be ECU.?Idle smoke is typically more fuel pressure and timing related than anything else. Sometimes pilot injection can have an affect on that as well. What sort of rail pressure are you running at idle?
Found wire rubbing to fender on my frankinstein. Hopefully get video if no rain tomorrow. I guess bunch of issues at one time making things tuff. Everytime i removed Ecu to test wires it moved them enough so was not rubbing, put back to gether and take a ride it must have moved back and grounded out.Apreciate the helpAnything is possible, but I would bet it is a wiring problem unless you installed a cheap parts store sensor.