Mac from MPI just shot this over to me.
If its good for me to know, then its probably good for ANYONE running an MPI Turbo to know.
[FONT="]Subject: 850 tips[/FONT]
1. Operate at or below 8000 rpm.
We have noted damaging detonation occurring at 8500 rpm.
We believe that OEM rev limiting may play a role.
Please just eliminate this potential by targeting operation at or below 8000 rpm (clearly occasionally bumping 8100 is not likely to cause an issue).
2. High quality Pump Premium fuel is required.
Use care with off brand stations. Avoid old fuel (over 2 weeks old).
Race gas is insurance, not required for operation; but we will never say no to race fuel.
3. Do not lean down the MPI GEMS fuel controller.
Do not adjust the GEMS.
We have no indication that our OEM setting are wrong or that any potential drivability issue could be corrected with leaner settings.
4. Should not operate full throttle over 180F water temp.
We cannot tell you how many “bars” this is on the indicator, but you can switch to digital engine temp readout and correlate your bar reading to 180F.
WE HAVE NOT OBSERVED AN OVERHEATING PROBLEM WITH THE VEHICLE.
Just be aware of the 180F limit – we believe the OEM warning does not occur until 212F.
5. If your screen / display show at text message “ENGINE KNOCK / OVER REV”; this is not normal! Performance at MAX boost should be avoided until the problem has been corrected. Items 1 thru 4 above could result in this warning and should be considered when diagnosing a problem.
[FONT="]Regards,[/FONT]
[FONT="]Mac[/FONT]
[FONT="]Mac Randolph[/FONT]
[FONT="]Mountain Performance, Inc.[/FONT]
[FONT="]12379 South 265 West, Unit B[/FONT]
[FONT="]Draper, UT 84020[/FONT]
[FONT="]www.MountainPerformance.com[/FONT]
If its good for me to know, then its probably good for ANYONE running an MPI Turbo to know.
[FONT="]Subject: 850 tips[/FONT]
1. Operate at or below 8000 rpm.
We have noted damaging detonation occurring at 8500 rpm.
We believe that OEM rev limiting may play a role.
Please just eliminate this potential by targeting operation at or below 8000 rpm (clearly occasionally bumping 8100 is not likely to cause an issue).
2. High quality Pump Premium fuel is required.
Use care with off brand stations. Avoid old fuel (over 2 weeks old).
Race gas is insurance, not required for operation; but we will never say no to race fuel.
3. Do not lean down the MPI GEMS fuel controller.
Do not adjust the GEMS.
We have no indication that our OEM setting are wrong or that any potential drivability issue could be corrected with leaner settings.
4. Should not operate full throttle over 180F water temp.
We cannot tell you how many “bars” this is on the indicator, but you can switch to digital engine temp readout and correlate your bar reading to 180F.
WE HAVE NOT OBSERVED AN OVERHEATING PROBLEM WITH THE VEHICLE.
Just be aware of the 180F limit – we believe the OEM warning does not occur until 212F.
5. If your screen / display show at text message “ENGINE KNOCK / OVER REV”; this is not normal! Performance at MAX boost should be avoided until the problem has been corrected. Items 1 thru 4 above could result in this warning and should be considered when diagnosing a problem.
[FONT="]Regards,[/FONT]
[FONT="]Mac[/FONT]
[FONT="]Mac Randolph[/FONT]
[FONT="]Mountain Performance, Inc.[/FONT]
[FONT="]12379 South 265 West, Unit B[/FONT]
[FONT="]Draper, UT 84020[/FONT]
[FONT="]www.MountainPerformance.com[/FONT]
