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12-20-2007, 12:39 PM | #89 | |
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For reference, the 997 911 turbo runs up to 14.5 psi of boost. |
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12-20-2007, 12:58 PM | #90 | |
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12-20-2007, 01:30 PM | #91 | |
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12-20-2007, 01:33 PM | #92 | |
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12-20-2007, 01:45 PM | #93 | |
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12-20-2007, 01:51 PM | #94 | |
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12-20-2007, 01:56 PM | #95 | |
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Btw, I drove both a few runs on different autocross courses, where you are constantly going from braking to WOT, which really showed the lag. |
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12-20-2007, 02:03 PM | #96 | |
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12-20-2007, 02:33 PM | #97 | |
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12-20-2007, 02:41 PM | #98 |
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my guess is there is not more lag, just feels that way because there is more boost. So the differen between no/partitial/full boost is more noticeable.
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12-20-2007, 03:15 PM | #99 | |
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I guess it could be intentional, maybe procede moves the power band farther up the rpm range. I don't know anything about procede so I have no idea. |
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12-20-2007, 05:47 PM | #100 | |
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12-20-2007, 06:34 PM | #101 |
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That'd be a pretty significant delay - must be running those electrons around in circles before letting them escape the piggyback unit. But since the size of the turbos hasn't change, it could only be the boost mapping or some odd duck internal delay in the add-on ECU. Wonder how the Dinan feels?
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12-20-2007, 07:12 PM | #103 |
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There wouldn’t be more lag.
Their would be more 'perceivable' lag as it relates to peak power. The exhaust gasses are flowing at the same rate causing the blower to spool at the same rate it just takes longer to reach max boost. |
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12-20-2007, 07:18 PM | #104 |
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12-20-2007, 07:24 PM | #105 |
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All other things being equal the larger turbo will have more lag but more power up top. Smaller turbo - less lag - less power up top.
The piggyback units to the ECU has to be doing something odd if there is perceptible lag given the fact that the turbos have not been changed. The onset of boost won't immediately provide max boost pressure, so I don't think the backpressure issue is there, that will happen further up the rev range. It is really odd that there is a lag perceived in the piggybacked cars. |
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12-20-2007, 08:02 PM | #106 | |
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I mailed the ECU to Hondata, they reflashed it, then mailed it back. Cost? $599. The reflash runs the larger aftermarket fuel injectors, changed the variable valve timing maps, lowered the VTEC changeover points (throttle dependent now), raised fuel cutoff to 8,600rpm, modified the ignition, increased the idle speed a tiny bit, and a few other things. Doug hacked the ECU himself, no need to pay royalties to Honda for access to their ECU's. $2,000 is too much money. Deeper pockets in the BMW world? |
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12-21-2007, 09:12 AM | #107 | |
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12-21-2007, 09:30 AM | #108 | |
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A GIAC update thread on E90 said they were having issues breaking the encryption on the ECU. Maybe this is something Dinan didnt have to deal with if they paid BMW? or were just given access? |
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12-21-2007, 09:48 AM | #109 | |
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Honestly, this is rather easy to figure out all we need is some one with the software installed. A boost gage would tell us, a dyno chart or a boost plot would as well. And about the price, It cost me $400 to have my Evo dyno tuned by a professional and I'll take a custom tune over a mail in flash any day. |
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12-21-2007, 09:51 AM | #110 |
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335i owners who have recently done the Dinan upgrade are not reporting any turbo lag. For that matter, I don't recall any 335i owner reporting turbo lag with any aftermarket ECU piggyback or flash. But then, I haven't read every post over on e90POST.
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