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Hi,
I am new on this World of HP Tuner and American Cars. :usa: I am helping to a friend to tun e his car. I read some manuals online and look at the forum to start the game.
My main problem is with the boost reading, I made a Histogram for boost using the Map PID minus 14.7 but the car dont past of 0.24 on the value, even if the car is going with 2 psi or 4 psi.
Thanks for your help and advices. :worship:
Regards.
The car is a Camaro LS1 5.7 1998.
You forgot to make it imperial. Should look like this. [PID.11.IMP]-14.5
I just tried but now is showing high outputs at wot. See the attachment please. :pray:
Do you have a 2 bar map sensor in the car? If so you need to log the 2 Bar PID.
Ed M
Your Map is way off in your tune (356kpa) --- Even at our altitude if I do my math right 356kpa - 91kpa "my baro" = 265kpa, 265kpa converted to psi (265x.14503773773020923=38.435psi) - Plus there's the fact that your only flowing 248.37g/sec on your Maf "at the very same time the map reading is", indicates your only making somewhere in the neighborhood of 298hp at the same moment the supposedly 38.435psi of boost was being made. This all tells me the map is way off in your tune. With the key on you should be reading "your" barometric pressure whatever that may be. You can install a scan tool in a "like" vehicle or average out 3 different vehicles readings if your unsure of this.
After you get your map fixed and your baro figured out, just reverse the math shown above to get "your" atmospheric value to subtract from the PID. This should be pretty spot on after you get all this fixed.
Hope this helps.
I want to know where the 356 MAP reading came from, the log he posted was 42 KPa at idle (cool) and slowly ramped up to 103 at full throttle (Boost) and why originally he only showed .24 of boost.. which told me he only had a 1 bar map sensor???????Quote:
Originally Posted by GHuggins
Ed M
Am I looking at the wrong thumbs? The one picture below his last post shows 356.6Kpa on the bar graph with the histogram pegged at 15.2 psi. BUT your right, I didn't look at the first thumbs. In those it shows the boost starting at 2.2 and then building to 8psi. Guess it's just how he has his datalogger setup as you stated with the 2bar.
Help us out, what are the two logs you posted, they look completely different? Which is correct? What PIDs are you using? Do you have a 2 Bar Map sensor in the car?Quote:
Originally Posted by LS1_Guy
Ed M
Thanks Guys,
I just test the car again rigth know. I uploaded the log and config file.
The Map sensor is Just 1Bar. The boost gauge show us 5 psi on this test. So i dont understand why the map stuck in 53kpa with the 4 psi pulley(before) and the 8 psi pulley (now).
Thanks for your help.
I am sorry but I dont have a clue what you are saying or asking? Your MAP is pegged at 103 in WOT which is about as high as the 1 bar sesor will go. Where is the MAP stuck at 53kPa? There is no Boost PID in your supplied .cfg!....please reiterate your question and the data you are providing in support of it.Quote:
Originally Posted by LS1_Guy
Ed M
I am talking about difference in the map reading in the gauge and the table display. 53kpa vrs 107kpa at wot. The boost gauge on the car show us 5 psi at wot and the BOOST on the table display shows 0.44 psi. :shrug:
Sorry for my english. lol
In the honda world the oem Map sensor 1bar can hold up to 10 psi, but i am assuming that is the same thing here, Is that my mistake ?
the honda is 1.7 bar stock, LS1 is 1 bar =100kpa only.
you need to switch to a difference map sensor to support high boost reading and to properly tune the vehicle
Quote:
Originally Posted by LS1_Guy
So the simple answer to your question is the 1 Bar MAP PID is capped at 103 kPa as the MAP sensor is also. That is the limit you can get unless you add a 2bar sensor. Interestingly, I fanagled the Custom PID for an hour or so and couldnt get the .imp to report PSI???? I eventually had to add the conversion factor to the PID??? So what was I doing wrong? Also at some point I mangaed to change the PID and F'd up the MAP PID to a huge number....much like the thumbnail picture up above, again dont know how that happened???
sorry
Ed M
Yo are totally right.:banghead:Quote:
Originally Posted by SultanHassanMasTuning
I switched to a 2Bar map sensor and now it is reading Booost :yay:
Thanks.
OK, did further testing and for whatever reason like Ed stated the usual pid - 14.5 doesn't work... Here's what I found to be nearly spot on.
([PID.11]*.14503773773020923)-(90*.14503773773020923)
Just enter your barometric pressure reading where my 90 is. You may have to add or subtract 1, but never the less it should read 0 psi key on engine off.
Hope this further helps.