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Car Forum / Nissan / Nissan Cars / September 2005Got horrible dyno results, how can I reprogram a 05 Maxima?
on my 05 Maxima SE with AT. Very disappointing.... The guy running the dyno is a Corvette tuner, and he suggested that I reprogram the car computer. He gave me a list of brands/makers: SuperChips, FastChips, HyperTech, TTS, Diablo, so I researched them, but none of these can reprogram the Nissan Maxima 05 microprocessor. Any suggestions? Did anyone reprogram their 6th generation Maxima? Thanks a lot in adavnce! > on my 05 Maxima SE with AT. Very disappointing.... What sort of numbers? What was the weather that day? > The guy running the dyno is a Corvette tuner, > and he suggested that I reprogram the car computer. I hope you were using premium fuel? Have you checked to make sure the knock sensor code isn't set? There is no CEL with that code and that will kill the performance as well as using anything other than premium fuel.  SignatureSteve http://www.atlantaracing.com > > on my 05 Maxima SE with AT. Very disappointing.... > [quoted text clipped - 6 lines] > sensor code isn't set? There is no CEL with that code and that will kill > the performance as well as using anything other than premium fuel. How do you fix the knock sensor code? >>on my 05 Maxima SE with AT. Very disappointing.... > [quoted text clipped - 6 lines] > sensor code isn't set? There is no CEL with that code and that will kill > the performance as well as using anything other than premium fuel. The results are here: http://tinypic.com/dx1hmf.jpg What is weird is that the speed limiter kicked in at below 100 mph! I believe the technician ran the car in the 3rd gear. I was using 92 octane. It was sunny, temp. in the mid eighties. Traction control was disabled. And the dyno was a DynoJet 248c. I'm not sure I understand what you meant about the knock sensor. >>> on my 05 Maxima SE with AT. Very disappointing.... >> [quoted text clipped - 22 lines] > > I'm not sure I understand what you meant about the knock sensor. That doesn't look too horrible to me. Your car was making 210 hp to the wheels at 6000 rpm. Since you have a 265 hp motor, you have to account for drivetrain loss. You will not see 265 hp on the dyno. Also, after 6000 rpm, your ECU may have kicked in from traction control and/or ABS b/c your rear wheels were standing still. CD > That doesn't look too horrible to me. Your car was making 210 hp to the > wheels at 6000 rpm. Since you have a 265 hp motor, you have to account > for drivetrain loss. That's what the technician said too. 20% loss! That's a lot. I would have gotten a MT, but the dealer assured me that I would have a very hard time selling it. > You will not see 265 hp on the dyno. Also, after > 6000 rpm, your ECU may have kicked in from traction control and/or ABS > b/c your rear wheels were standing still. Again, that's what the technician said. How did you know? :) >> That doesn't look too horrible to me. Your car was making 210 hp to the >> wheels at 6000 rpm. Since you have a 265 hp motor, you have to account [quoted text clipped - 11 lines] > >How did you know? :) He's your dyno technician! >> That doesn't look too horrible to me. Your car was making 210 hp to >> the wheels at 6000 rpm. Since you have a 265 hp motor, you have to [quoted text clipped - 3 lines] > have gotten a MT, but the dealer assured me that I would have a very > hard time selling it. Interestingly, the 6 speed manual has a similar drivetrain loss compared to the auto. Autos are the least efficient. The older 5-speed manual (in the 2001 and below Maximas) was more efficient in transmitting the car's power to the wheels. And as for the drive wheels, FWD is the most efficient followed by RWD and lastly, AWD. >> You will not see 265 hp on the dyno. Also, after 6000 rpm, your ECU >> may have kicked in from traction control and/or ABS b/c your rear [quoted text clipped - 3 lines] > > How did you know? :) I've done a few dynos myself:) CD >> That doesn't look too horrible to me. Your car was making 210 hp to the >> wheels at 6000 rpm. Since you have a 265 hp motor, you have to account >> for drivetrain loss. > > That's what the technician said too. 20% loss! That's a lot. The other thing is they dyno corrected for temp and altitude? The 265HP number is at the flywheel and at sea level in dry weather at moderate temps. Those aren't "horrible" numbers.. SignatureSteve http://www.atlantaracing.com > on my 05 Maxima SE with AT. Very disappointing.... > [quoted text clipped - 6 lines] > > Thanks a lot in adavnce! Try http://www.technosquareinc.com/ Also, possibly the 05 maxima can detect that it's on a dyno, as in the rear wheels are standing still so the ECU may cut output to protect the motor. CD > on my 05 Maxima SE with AT. Very disappointing.... > [quoted text clipped - 6 lines] > > Thanks a lot in adavnce! The biggest problem is that nissan started encrypting the ecm's. Between that and the the number of variations even within a model year(there are 16 variations for the 01 sentra 1.8L alone), I haven't heard of anyone making more than a dent in decoding the logics used. >> on my 05 Maxima SE with AT. Very disappointing.... >> [quoted text clipped - 11 lines] > 16 variations for the 01 sentra 1.8L alone), I haven't heard of anyone > making more than a dent in decoding the logics used. Yup, around the 98 model year. The ECU literally turned into a black box!:) CD |
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