Spraying meth and tunning Timming vs IAT ?
09-01-2009, 07:02 PM
#1
Spraying meth and tunning Timming vs IAT ? for the other guys spraying meth at there IAT sensor
IF
the meth system was to fail would temps rais fast enough and ECM pul timming fast enough
what do u have your timming vs IAT temps set to,, meaning tempature with meth spraying , and at what temp woud the ECM start pulling timming , and how much timming should be pulled
IF
the meth system was to fail would temps rais fast enough and ECM pul timming fast enough
what do u have your timming vs IAT temps set to,, meaning tempature with meth spraying , and at what temp woud the ECM start pulling timming , and how much timming should be pulled
12-06-2009, 06:57 PM
#4
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Has anyone actually seen a huge increase in horsepower on the dyno with running say 4 * more total timing at X amount of boost with meth vs. 4* less total timing at x amount of boost without meth?
12-06-2009, 09:09 PM
#6
I have it setup the way you described. I have timing pulled out starting at 1 deg @ 25C and quickly ramping up to 8.5 deg @ 55C.
Without meth timing is 14.5@4k RPM, 15@5k RPM, and 14.5@6k RPM. With meth it's 17.5@4k, 18@5k, 18@6k, and 18.5@6500. This is a tune for colder weather so it may need some tweaks come summer.
Seems to work pretty well as on the meth it added 20 hp/tq pretty much across the entire powerband. I didn't do it for power so much as peace of mind. These injection systems work pretty reliably anyway so it's not much of a concern.
About IAT speed. All of my scans show a lag of about 2.5 seconds for the IAT to go as low as it will go while spraying. For instance, if you punch it for 1.5 second then let off, then the IAT sensor will continue to drop for 1 more second even after you stop spraying. I was hoping for more responsive IAT readings, but it doesn't work that way. On the plus side, it feels like small shot of nitrous because after putting the pedal down, the IATs are still falling and consequently less timing is pulled. You can really feel the extra power as 2-4 degrees are added back in.
Without meth timing is 14.5@4k RPM, 15@5k RPM, and 14.5@6k RPM. With meth it's 17.5@4k, 18@5k, 18@6k, and 18.5@6500. This is a tune for colder weather so it may need some tweaks come summer.
Seems to work pretty well as on the meth it added 20 hp/tq pretty much across the entire powerband. I didn't do it for power so much as peace of mind. These injection systems work pretty reliably anyway so it's not much of a concern.
About IAT speed. All of my scans show a lag of about 2.5 seconds for the IAT to go as low as it will go while spraying. For instance, if you punch it for 1.5 second then let off, then the IAT sensor will continue to drop for 1 more second even after you stop spraying. I was hoping for more responsive IAT readings, but it doesn't work that way. On the plus side, it feels like small shot of nitrous because after putting the pedal down, the IATs are still falling and consequently less timing is pulled. You can really feel the extra power as 2-4 degrees are added back in.
Last edited by white01ss; 12-07-2009 at 12:08 PM. Reason: Added more details
