04-15-2012, 07:03 PM
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#1 |
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3" Exhaust
Join Date: Mar 2010
Location: Oxnard
Posts: 109
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Tuning
lets say i live at sea level and i get all my tuning at x amount of altitude, when i come home will the tuning suffer because of the altitude change?
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04-15-2012, 08:27 PM
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#2 |
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3" Exhaust
Join Date: Mar 2012
Location: California
Posts: 105
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Depending on the type of air/fuel sensor your using a I don't think it should. A good tune shouldn't change varying density of the air
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04-15-2012, 08:44 PM
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#3 |
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12psi boost
Join Date: Mar 2011
Location: fort myers florida
Posts: 345
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From what I remember the mk3 had an altitude adjuster which compensated for altitude but unless your in malaise it shouldn't make that big of a difference. I could be wrong and also are you running a factory ecu or aftermarket.
Also if you can include any mods and what ur car specifics it would help out in giving you a better answer
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1987 7m-gte R-154, SS braided clutch line, full 3in exshaust,aluminum radiator,full throttle gen 2 whith GM 3 inch mass air flow,13lbs flywheel, and more to come |
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04-15-2012, 09:41 PM
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#4 |
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3" Exhaust
Join Date: Mar 2010
Location: Oxnard
Posts: 109
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i will be running the innovative motorsports LC-1 along with either NEO, or MAFT not sure which route i should take
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04-16-2012, 12:01 AM
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#5 |
 Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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The ECU doesn't monitor the AFR all the time. There's a good deal of time that it doesn't. The HAC sensor is in place because when the ECU isn't reading the O2 sensor it determines proper mixture based on AFM readings and other fixed data. BUT, the oxygen content of our atmosphere isn't directly proportionate to the pressure... So the HAC is used to determine bigger shifts in atmospheric pressure so that the calculations can account for the difference in oxygen content as well.
Any after market fuel control should be re-tuned if you're going to be spending any significant time at an elevation that is greatly different from that where it was originally tuned. Neo or MAFT? Two totally different systems; The MAFT isn't something I'd use to tune fueling, It's really just intended to adapt from the KVAFM to a MAF. If you meant a MAFT Pro or MAFT Gen II they can be set to monitor AFR much more aggressively than the stock ECU and to do so at times when the stock ECU doesn't monitor the O2 sensor (the same goes for the Neo).... BUT I still wouldn't rely on it and advise that the base tune be properly adjusted with this feature turned off. If the wideband were to fail you would be running on a crap tune. Depending on how your system is setup in the end it may be advisable to delete the HAC sensor.
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04-16-2012, 01:34 AM
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#6 |
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3" Exhaust
Join Date: Mar 2010
Location: Oxnard
Posts: 109
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Well in my case, where i live we are 12gonna feet above sea level, the nearest place i can get a dynotune at is los angeles and they are 233 feet above sea level. Will there be a big difference? Is it critical to swith from KVAM to MAF?
These are my specs and plans rebuilt motor. 20 over Hks stopper hg. Arp studs. Ct57. Bic ddp. 550cc injectors and i plan on getting the lc-1 and neo, walbro( and i need a AFPR too right?) Very soon. Any body suggest different route? I want to land any where from 350-450rwhp |
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04-16-2012, 02:46 AM
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#7 |
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Toyota Racing Development Join Date: Apr 2007
Posts: 5,038
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Altitude change..... 200' difference......
Let me put this gently.... Bwaaahahahahahahahahaha.... <cough>... hahahahaha.... <wheeze>.... hahaha..... Um, I think you'll be just fine.  You're being overly cautions, which isn't a bad thing. No, I'm talking about altitude changes of 4,000ft.
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If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar ---> |
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04-16-2012, 01:20 PM
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#8 | |
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Supra Forum Moderator
Join Date: Nov 2009
Location: Green-Ohio
Posts: 1,297
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Quote:
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 92 Ma71 7mGTE Auto. SafcII Supra FAQ Supra MKIII FAQ Classified Section guidelines : |
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