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Originally Posted by skittleslegend
Ah, thanks. It was kinda of confusing. It seems less so of a problem for S/C the car than it is for turboing. But most of the turbo/S/C kits I've seen for different cars with MAF sensors, like VR6's, come with larger MAF housings. I've seen the design of a MAF plug. It's interesting how they divert airflow over the sensor. But it makes sense that a BOV (that releases to the atmosphere not back into the system) would cause the MAF to run rich.
So with the DBW on the STi's and BMW's does the chip actually increase throttle sensitivity? That seems to be a problem with the Si, is it's lack of sensitivity during spirited driving. I know the lag was a tad annoying. I've heard people getting annoyed about the artifical way the revs hang but I thought it was a good thing. It allowed me to enter a corner at a high rev and maintain VTEC all the way through so I could exit faster.
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I've seen people on here ask about the DBW lag, and to be honest, it is no issue with the STi and most likely you are feeling turbo lag. What the DBW program on the STI does is tend to make the pedal more sensitive, meeting if you stab it at half throttle, the car thinks you were going for full and pulls the cable more than you expected, so it is actually overly sensitive. Some after market ECUs for the STi (the Hydra) have a DBW function that is more linear...kind of making your pedal feel analog, like it should.
The big thing that concerns me about MAF based setups is passing OBDII emissions. Without the MAF, you could throw anything at the car and as long as it passed the sniffer test, you were fine. Now if you remove your MAF and go for OBDII, you will fail. Although, many companies have made some strides in Engine Management to address this.
On thing though, who ever makes the first turbo kit needs to make it use a blow-through MAF (MAF sensor on the pipe between the intercooler and the throttle body).