Don't let them borrow the truck then....91 octane must be used with an 91 tune or you risk detonation.

 

Airaid JR kit has the high flow tubing to remove the Hemi hat and a figh flow filter for the stock box. 1/2 the price of the K&N with the same results.

 

ok i know that the 87 tune saves a bit more gas but does it also give a different performance than stock? i know that the 91 tune gives more hp but does it also help a bit with MPG? are the shift points the same from the 87 tune and the 91 tune?

 

87 tune does give more power than stock and also a better a/f ratio...from what diablo says. I've only had the 91 tune so I can't comment on the 91 over 87 mpg wise.....both have the same tranny settings. The WOT and part throttle shifts point are also adjustable.

 

but do atleast do both tunes give a bit more MPG? can i switch the tunes when ever i want back and forth?

 

does 91 tune give you more mpg than stock?

 

look it says right here that the 91 tune can be used with 91,89,87 octane or am i reading wrong? or are they wrong???

• WOT Spark 1k-3.8k:
  Allows user to adjust timing +/-10 degrees in the 1000-3800 rpm range
• WOT Spark 4k-4.8k:
  Allows user to adjust timing +/-10 degrees in the 4000-4800 rpm range
• WOT Spark 5k-7k:
  Allows user to adjust timing +/-10 degrees in the 5000-7000 rpm range
  To properly dial in your timing using the Predator you need to log or monitor the following live data parameters.
  Spark, this is your actual timing (in degrees) at any given time.
  Knock Retard, this the amount of timing removed (in degrees) due to knock (detonation/ping). The knock sensors can in rare cases pick up other harsh engine noises as well, if this is the case it is recommended to fix the cause of the noise before proceeding.
  You basically always want the knock retard to read zero under wide open throttle conditions, it is normal for it to show some KR when stomping on the throttle and also during the shift.
  Monitor the spark and the knock retard pids under wide open throttle and see if you have any knock retard, anything higher than 1 should be adjusted in the respective timing range in the Predator , if the knock is severe, 5 deg plus, try lowering spark by 10%, if less than 5 deg, try 5%. Make another wide open pass and monitor the same pids and basically keep doing this until you seen no knock retard.
  NOTE: The use of respective grade fuel should be used with tune choice.
  91 octane tune will run on 87,89 and 91 octane. The 93 octane (Performance) tune will run on 91 and 93 octane. If severe knock cannot be remedied by adjusting the parameters for it, try to install the factory tune and monitor the knock using it. If knock still is present consider switching fuel brand.
  DiabloSport recommends using fuels from the following vendors:
  Mobil, Sunoco and Amoco/BP.

 

can anyone answer my question from above?

 

??? anyone? bump

 

for the 91 tune you have to use 91 or higher, for the 87 tune you can use 87 or higher. if you dont you risk pre-denotation on your engine