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Take 5: Vishnu 335i - Finally tested the Vishnu Stg 1 "kit"
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11-21-2006, 08:08 PM | #89 |
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I dont get the point of a 100 octane tuning? Unless of course you're planning on building a street racer and driving around with 93+ octane all the time? or will that sort of tuning result in a more efficient map overall?
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11-21-2006, 08:49 PM | #90 | |
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We have successfully raised rev limiters with the Xede. This is because the Xede is capable of driving the coils and injectors directly if configured appropriately. This is what makes it a bit different from other piggy-backs. The main reason we have opted to be as non-evasive as possible has to do with warranty and trace-ability concerns. Our goal, first and foremost, was to make the Xede completely undectable by the DME or anyone monitoring the DME. However, if we were to ever run into issues such as E-throttle bottlenecks, we will find a way to get around it. It just hasn't happened. It seems as if modern computers are getting easier, not harder, to be manipulated if the necessary measures are taken. About half of our business is ECU reflashing (Subaru, Evo, etc,.). The other half is XEDE tuning. Either one can be a complete engine control solution. It's up to the user to determine what his constraints and needs are. my 2c, shiv |
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11-21-2006, 09:02 PM | #91 | |
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Let me put it this way, about 75% of all our Evo XEDE customers ask for both pump gas and 100oct race gas maps when they come into the get dyno tuned. Depending on the turbo in the car, the race gas map is worth 40-100whp more than the pump gas map. On the good stuff, the cars run cooler, happier and a helluva lot stronger. They toggle over to the race gas map when they go to the drag strip, track days or even... ahem... street races. It's their secret "equalizer" when it comes to going up against the bigger boys. I'm eager to do a 100ct map with my 335i. I just haven't gotten around to it yet. I'm guessing it'll hit 400lbft of torque at the wheels without any problem. Peak hp will be limited by turbo capacity but I'll be dissappointed if we don't see 370whp. -shiv |
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11-21-2006, 09:02 PM | #92 | |
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On a Bosch Motronic and Siemens (for BMW), there isn't a wire you can tap into and set rev limits/speed governors. Although it may be possible on certain cars with piggybacks, as far as warranty issues, in the worst case scenario a turbo blows maybe even an engine, spliced wires are visible which will mean void of warranty anyway. Again, for informational purposes only, we're all in the same boat regardless of how we're going to tune these vehicles, but there's no "undetectable" way to tune the car (cutting wires, opening up ECUs, or ODBII tuning). All leave "junk code" or traces, or counters. Also, what happens if the ECU begins adapting back to stock regardless of piggyback - how long has R&D been tested for the Xede? Thanks in advance, JP |
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11-21-2006, 09:13 PM | #93 | |
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We are cutting no wires with the XEDE install. We're not even tapping into any wires. And there is no trace, counters or "junk codes" associated with running the XEDE. I'd like to think we thought it out pretty well. As for ECU adapting back to stock, it doesn't because we effectively recalibrate the feedback sensors responsible for the learning. The DME sees nothing out of the ordindary. Injector duty cycle, Calculated load, Wastegate duty, fuel pressure, knock counts, fuel/ignition trims, wideband signals, etc,. will all show normal values when logged. A lot of this is attributable to the software flexability with regards to mapping. We're able to generate conditional inputs/outputs based upon any number of input/output variables. I don't know of any stand-alone or piggy-back system that does this. Nor I am aware of anyone who has managed to reverse engineer such tuner-definable logic into factory ROM functionality. Every system has it's strenghts. This just happens to be ours. So far, we've put close to 5000 miles on our car. 4800 miles with the XEDE. The car has displayed perfect long-term consistency. And there is no reason for this to change. -shiv |
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11-21-2006, 09:19 PM | #94 | |
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11-21-2006, 09:20 PM | #95 | |
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11-21-2006, 09:25 PM | #96 | |
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11-21-2006, 09:29 PM | #97 | |
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11-21-2006, 09:31 PM | #98 | |
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11-21-2006, 09:36 PM | #99 | |
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11-21-2006, 09:51 PM | #100 |
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I love knowledge.
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11-21-2006, 10:00 PM | #101 | |
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Would it make sense to have a seperate map for those of us that live at high-altitude? I for example, live at 4,500 above sea level. The atmpospheric pressure here is about 12.5 psi versus 14.7 at sea level. Will the turbo's fully compensate for this decrease in air pressure or would it make sense to have another map that would add 2.2psi of boost across the rev range to help compensate? Thanks! |
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11-21-2006, 10:08 PM | #102 | |
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11-21-2006, 11:11 PM | #104 | |
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11-21-2006, 11:22 PM | #105 | |
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11-21-2006, 11:23 PM | #106 | |
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http://www.e90post.com/forums/showth...637#post491637 dont worry about the 20 bucks... |
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11-22-2006, 12:02 AM | #108 |
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SHIV -
I'm not interested in ULTRA performance, just something that will boost what I have by a good margin and keep the stock exhaust. I also want to know what the ZERO to 60 times are and qtr mile; I know a lot of people put some times down, but I haven't found your real world numbers. Because this all looks good on a dyno, but you and I know what happens on the street is different... Also any LSD in the works? |
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11-22-2006, 12:29 AM | #109 | |
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Sorry, but he is right and you are still wrong. He wasn't asking about Shiv removing the 155 limiter on the ZSP equipped cars which is what the post you linked was referencing. I'm not sure why it is so hard for you to see the difference but it is 2 completely different Q & A's: 1. Shiv, can/will the Xede remove the 155 MPH speed limiter or increase the rev limiter above 7000, Answer, No (see page 23) 2. Shiv, can the Xede make the non-ZSP equipped 335i's the same as ZSP 335i's so that the top speed is limited at 155 and the car will redline at 7000 rpm in 4th gear, Answer, "It'll take a bit of work. And, to be honest, it's a safety/liability issue I'd rather not get into." page 3 take 5. To me this answer is still somewhat ambiguous. I can't see how it is a liability issue since you are still under the self imposed 155 max that I think pretty much all imports conform to except P cars and ultra exotics Lets face it, we are all exposed to liability whether it is tunign a car to accellerate much faster and someone going kaboom, or practicing medicine, law, construction, etc. |
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11-22-2006, 01:00 AM | #110 | |
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Just my 2c, shiv |
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