Sorry, can you expand on this? I thought that JB4 map 2 was specifically created for cars running downpipe. Terry / team are saying that's what I should be running, so I'm a bit confused by your statement.
Also, upon further research, I'm planning to just supplement with Torco. Seems like the easiest way to bump up octane level by a few notches to ensure that timing doesn't get pulled. Any cons to that vs. supplementing with E85?
Quote:
Originally Posted by bradsm87
I would not run map 2. I'd run MPPSK with 85% 93oct and 15% E85 and I'd ask Terry for a custom JB4 firmware that doesn't modify the IAT signal to the DME and run map 1. That way, you get good reported torque, fairly close to DME boost target (so better fuel trims) and fairly aggressive timing.
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