[Icy J]

Originally Posted by mike@x-ph.com

This is not a disadvantage. On the contrary it should be thought of as an advantage for the Jb4. It connect to more sensors so it can offer more control, safety and power over any other tune.

Disadvantage in that it makes it obvious that a tune has been used lol. Not sure about the details so idk

Also is flex fuel necessary if not using E85?

[Silvermike]

Originally Posted by Thescout13

That's the JB4...the jb4 does require tapping in with positaps to the Can wires which leaves a little pinch it's not splicing. But you were talking about the FF wires. The FF wires for the x20i does not require any additional splicing of the stock car wires only of the JB4 wires....

ure right, the wires that are spliced for the FF connector are actually on the JB4 harness itself. (2 green wires)

[Silvermike]

Originally Posted by Icy J

Disadvantage in that it makes it obvious that a tune has been used lol. Not sure about the details so idk

Also is flex fuel necessary if not using E85?

Terry from burger said that the "FF connectors are suggested when using the JB4 on a 20i motor due to fueling issues"

[Thescout13]

Originally Posted by Silvermike

Terry from burger said that the "FF connectors are suggested when using the JB4 on a 20i motor due to fueling issues"

Also when you are using the EWG connector they sell

[FSociety]

Going to Dynojet this Saturday afternoon at a Top Performance shop Vinny Ten Racing with my Dinan buddy. Lets see if Racechip is really stage1 or stage2 equivalent in power. As far as I can tell from my 4 1/2 months experience of usage and racing in open course 0-60, 0-80, 20-70 against 35i friend its def more than a stage1.

Me & My Dinan friend attended a Mustang Dyno Day event graphs here
http://f30.bimmerpost.com/forums/sho....php?t=1098282

I like Racechip because it only needs MAP, TMAP and MAF sensor plug in, being a noob I was comfortable enough to install it within 20mins took longer unclipping the sensors than anything. Difference in power was noticeable right away. I do data logging via OBDLink (Scantool OBD2 Port) and use either its free obdlink app, torque pro or dash command.

Here's a thread we have been using for the Torque Pro reading that is very very accurate.
http://f30.bimmerpost.com/forums/sho....php?t=1082254