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#1
09-01-2001, 01:22 AM
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Altitude calibration?
we bought our 99 g20 in NY. the elevation there is about sea-level. we recently moved to denver, colorado, where the elevation is approx 5280 ft. when we brought it in to the Denver Infiniti dealer for its 15k miles checkup, he said that the sensors or whatever would need to be recalibrated because of the altitude change... or some shit. i dont remember if he charged or not, but he said he did it.
before i bother to dig up the invoice to see if he did in fact charge for this.... does any of it make any sense to you? or was he just taking me for a ride? 
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#2
09-01-2001, 03:20 AM
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well...what I heard when I was learning about hondas is that the ECU can calibrate itself to the altitude...just need to reset ECU....I don't know if the same goes for the Nissan cars....This is what I heard...
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#3
09-01-2001, 10:15 AM
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Pure and total bullshit! If you were charged for anything related to that lie, you should notify the state Attourney General.
The SR20 engine uses a hotwire mass air flow sensor that will automatically adjust to differences in air density. There is absolutely nothing that needs to be changed when changing elevation.
__________________
George Roffe Houston, Texas USA 00 328i 91 SE-R (well modded) 84 944 SCCA ITS race car under construction "I fear all we have done is to awaken a sleeping giant and filled him with a great resolve" -- Admiral Yamamoto, December 7, 1941
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#4
09-01-2001, 06:26 PM
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Yeah, the only thing that changes is your HP
 I just moved from Phoenix to Tucson, Az. And it's about 1000 feet higher in Tucson (I havn't checked yet, but that's what I've heard). But I can feel it in my car. When I went back to Phoenix my car felt soooo much stronger. Oh well, I'll just have to get cams or something like that to make up the difference. Anyone know of a calculation to find the hp loss at any given altitude? Thanks
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Justin McClanahan 95 G20 15.4 @ 91.4mph (2.4 60ft  )143.7whp and 131.4 ft.lbs Primera (10:1) Intake Cam, HS CAI, HS Header, UR Pullies, 19* Timing, ACT, Lightened Stock Flywheel, GC/AGX, Pacesetter Short Shifter, and more stuff...
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#5
09-01-2001, 10:01 PM
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i found this
http://home.sprynet.com/~rshelq/calc_hp_dp.htm OK so youre all saying there is no reason for the ECU to not compensate for a change in altitude. now, after a certain amount of miles, i can understand the ECU needing a recalibration. but would one need to be done after only 15,000 miles? this car would be over two and a half years old, though. i still havent found the bill for the 15k miles checkup, but i do remember it coming out to over $400. this was all for routine stuff... nothing was breaking on the car or anything.
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#6
09-01-2001, 10:10 PM
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Quote:
Quote:
There are some who think that resetting the ECU will help it to learn new conditions faster. Others believe it makes no difference. The reality is that it depends upon whether the base settings are closer to the idea settings than wherever it's currently at, and there is no way to tell. The ECU has a self learning program to make minor adjustments based upon a variety of things. This is relatively minor however.
__________________
George Roffe Houston, Texas USA 00 328i 91 SE-R (well modded) 84 944 SCCA ITS race car under construction "I fear all we have done is to awaken a sleeping giant and filled him with a great resolve" -- Admiral Yamamoto, December 7, 1941
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#8
09-02-2001, 09:36 PM
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the lower the altitude, the more oxygen for the engine. as for temperature... cold air is more dense, so i would think the colder it is, the better.
And as for the ECU adjusting... we'd had the car here for over 6 months. the ECU woulda finished adjusting by now, i would think, if ever. i truthfully didnt notice any difference in the engine. i'm gonna find that bill and oh boy if they charged...
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#9
09-02-2001, 10:37 PM
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Wait, wait let me guess Brian...
oh boy if they charged... you're gonna ask the owner if he's ever tried picking up teeth with broken fingers. 
__________________
Some people are alive simply because it is illegal to kill them.
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#10
09-03-2001, 11:26 PM
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i hear the WRX has some special sensor that will adjust its ecu to altitude changes so no matter where you go, it will continuously change the settings to get optimum performance.
does your G feel stronger than when you first arrived denver? if so, then they might've changed something in the car to make it perform better... from my honda buddies, I hear that the ecu on my honda cars will adjust to the new environment after about a week of driving around in the same atmosphere. could be only on my lude and not the civic. dont know. i think its time you get a nos kit. hehehe. 
__________________
1998 Prelude SS - TEIN HA with upper pillows, SSR Integrals 17x7 with SP8000 (215/45), GReddy Evo catback, Iceman Comp Intake, DC Sports header, Apexi VAFC, ZEX 55 shot with bottle heater, NOS blanket, Factory Body Kit, Spoon F/R tower bars, JDM Foglamps, Carbon Fiber trim, Razo pedals &knobs, Fiamm Dual air horn Future Mods: Lighten car, 2nd 10lbs nitrous bottle would be nice too. 2001 G20 P11 AT- TEIN NA, TRM Snipers 17x7 with Potenza RE910 (215/45), Arospeed Dual-outlet Muffler, K&N Drop-in Airfilter, WW Front Lip, Nakamichi MB75 1DIN 6CD Changer/Receiver, FIAMM Dual Air horns, Levoc Pedals, PIAA (H4 Superwhite H3 Ion Crystal, 168 SuperWhite) 2002 WRX MT- TEIN HA's with upper pillow mounts, 1000Miglia HT3 17x7 with sumitomo HTR+ 225/45/17, painted side skirts, Cusco front & rear strut bar, Whiteline rear swaybar, aluminum endlinks, Blitz NUR Catback, HKS seq. BOV, factory front lip, rear valance, Kartboy short shifter and bushings. Future mods: dressup wheels with Potenza S03 225/45/17 tires, TurboXS UTec, maybe an uppipe. by then, it'll be fast enough.fiamm dual air horns.
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#12
09-04-2001, 01:22 AM
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No special sensor and no ECU reset required.
__________________
George Roffe Houston, Texas USA 00 328i 91 SE-R (well modded) 84 944 SCCA ITS race car under construction "I fear all we have done is to awaken a sleeping giant and filled him with a great resolve" -- Admiral Yamamoto, December 7, 1941
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#13
09-04-2001, 02:17 AM
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i didnt really notice any difference in the performance of the engine... even if there was the tiniest of differences... it would probably be due to the other things they did like changing oil and such.
i'm still looking for that invoice. and hey look what i found... a converter to figure out lost horsepower at altitude: bhp loss = elevation in feet / 1000 x 0.03 x bhp at sea level so my G woulda lost 22 bhp in Denver fyi, that only works for N/A cars.
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#14
09-04-2001, 03:48 PM
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found the invoice. there was a long ass list of stuff that they did that was included in the 15k mile checkup.
at the top of the list was Adj. Inj., Adj Fuel/Air ratio, A/F R and the totals for the checkup were 4.2 hours, $315 labor. that does not include the cost of replacement parts like air and oil filters. those totaled almost $100. so did they charge me for labor hours? or what? if they didnt charge for labor hours, why would they even say anything about it at all?
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#15
09-04-2001, 04:34 PM
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Quote:
__________________
George Roffe Houston, Texas USA 00 328i 91 SE-R (well modded) 84 944 SCCA ITS race car under construction "I fear all we have done is to awaken a sleeping giant and filled him with a great resolve" -- Admiral Yamamoto, December 7, 1941
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