Highest safe level of PSI on 91.
The reality is that this question has too many variables. If this is with a clean, cool IC, cool day, on its first run that will only last approximately 12.5 seconds, you can probably run pretty high boost without knock, assuming a good tune.
Now, if you want to run with ambients in the 100F range for 30 minutes of WOT and near-WOT, you are much more likely get a pretty hot charge going at some point and then you will see knock.
Now, if you want to run with ambients in the 100F range for 30 minutes of WOT and near-WOT, you are much more likely get a pretty hot charge going at some point and then you will see knock.
Originally Posted by nj1266
Just for comparison purposes here is what I have:
rpmx100-----Load------Tim------AFR
35-37--------240ish-----4-2-----11.4-11.5
40-45--------220ish-----5-6------11.4-11.5
45-50--------220ish-----4-5------11.4-11.3
50-55--------low220s---6-7------11.3
55-60--------210-213---7-9------11.3-11.2
60-65--------205-196---9-12-----11.2
65-70--------195-180---11-16----11.2-11.1
70-75--------179-171---16-18----11.1-10.97
On some runs I do get knock counts of 3-1 range @ peak boost/torque and sometimes @ the top of the rpms range. On other runs no knock counts up top at all. The boost is set @ 21.xx and rarely goes to 22 psi. I run the car on 93-94 octane that I mix @ the pump.
The car consistently puts down about 300 whp and 280ish torque on the DLL dyno plot. Oddly, the most impressive dyno plots are the ones that have a bit of knock sum in them
rpmx100-----Load------Tim------AFR
35-37--------240ish-----4-2-----11.4-11.5
40-45--------220ish-----5-6------11.4-11.5
45-50--------220ish-----4-5------11.4-11.3
50-55--------low220s---6-7------11.3
55-60--------210-213---7-9------11.3-11.2
60-65--------205-196---9-12-----11.2
65-70--------195-180---11-16----11.2-11.1
70-75--------179-171---16-18----11.1-10.97
On some runs I do get knock counts of 3-1 range @ peak boost/torque and sometimes @ the top of the rpms range. On other runs no knock counts up top at all. The boost is set @ 21.xx and rarely goes to 22 psi. I run the car on 93-94 octane that I mix @ the pump.
The car consistently puts down about 300 whp and 280ish torque on the DLL dyno plot. Oddly, the most impressive dyno plots are the ones that have a bit of knock sum in them
Originally Posted by mchuang
What is the highest load you see. I saw 269 for first time on the run where I encountered 5-6 knocks where as normally it doesnt hit over 250 and that is with error protection lol.
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