andyfi
Aurora Watcher
1995, 4.0, 300.000 km!
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Post by andyfi on Aug 14, 2011 7:20:06 GMT -6
My friend told me that the Canadian version of the Aurora has a built-in speed limit. Is this true?
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Post by lanceslambos on Aug 14, 2011 16:41:08 GMT -6
it doesn't matter if it's Canadian or not, all auroras have a speed limit by their brain, even autobahns
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bobsblue95
Super Moderator 
Scars of pleasure, scars of pain. Atmospheric changes make you sensitive again.
Posts: 3,125
Staff Member
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Post by bobsblue95 on Aug 15, 2011 8:38:22 GMT -6
Yep, non-autobahns are limited to 110, autobahns to 140. The only reason they can make one higher is by specifying the higher speed V-rated tires instead of standard S-rated. It's possible to get the pcm reprogrammed to change the limit, but you better have tires and skill to match.
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Post by aurora4 on Aug 15, 2011 9:32:31 GMT -6
i remember when i discovered i can do 135. it was great.
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Post by beastboy1976 on Aug 15, 2011 11:20:47 GMT -6
i remember when i discovered i can do 135. it was great. I know how you feel, I felt simply exhilerated ;D |
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andyfi
Aurora Watcher
1995, 4.0, 300.000 km!
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Post by andyfi on Aug 17, 2011 0:28:46 GMT -6
So. How I can reprogram my PCM?
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Post by nelson480 on Aug 17, 2011 0:37:03 GMT -6
Why do the non autobahns have the lower gear ratio? that makes no sense to me
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Post by dylanm on Aug 17, 2011 1:40:11 GMT -6
^ my guess is so the autobahns will pick up quicker, and non autobahns will get better mpg's. With 260ft lbs of torque it makes little to no difference imo, but then again i haven't driven or owned both so i wouldn't know for sure.
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Post by Marc on Aug 17, 2011 7:24:49 GMT -6
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bobsblue95
Super Moderator
Scars of pleasure, scars of pain. Atmospheric changes make you sensitive again.
Posts: 3,125
Staff Member
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Post by bobsblue95 on Aug 17, 2011 8:41:44 GMT -6
Why do the non autobahns have the lower gear ratio? that makes no sense to me I agree, but I think dylan's right, it was for (slightly) quicker pickup. The top end could have been reprogrammed without changing the gear ratio. |
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Post by beastboy1976 on Aug 17, 2011 9:16:45 GMT -6
Yeah I agree with dylan. I also agree that when driven properly the non autobauhn's will get slightly better mileage.
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Post by lanceslambos on Aug 17, 2011 16:51:15 GMT -6
Yeah I agree with dylan. I also agree that when driven properly the non autobauhn's will get slightly better mileage. yep and if you program out the speed limiter on a non autobahn it would be even faster than an autobahn by 3-5 mph |
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bobsblue95
Super Moderator
Scars of pleasure, scars of pain. Atmospheric changes make you sensitive again.
Posts: 3,125
Staff Member
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Post by bobsblue95 on Aug 17, 2011 19:52:40 GMT -6
but still a tad slower in the quarter mile
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Post by lanceslambos on Aug 21, 2011 11:01:11 GMT -6
but still a tad slower in the quarter mile yea a few tenths of a second. nothing that some intake and exhaust mods couldn't compensate for. |
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Post by aba1987 on Sept 7, 2011 21:09:11 GMT -6
Since were on this subject... today me and Nelson had a mini meet and raised a question. Please verify. What is the easiet way to tell if u have an Autobahn or non
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Post by Blacky Bulger on Sept 7, 2011 21:26:06 GMT -6
Sticker on the door that specifies your tire specs!
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Post by aba1987 on Sept 7, 2011 22:01:04 GMT -6
That's what Nelson said...he has S on sticker I have a V on the sticker
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Post by nelson480 on Sept 7, 2011 22:23:35 GMT -6
AUTOBAHHHNNNN!
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Post by aba1987 on Sept 7, 2011 22:28:15 GMT -6
Let's go 140 Nelson!
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Post by nelson480 on Sept 7, 2011 22:30:18 GMT -6
Im limited to 110 D:
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Post by aba1987 on Sept 7, 2011 22:38:23 GMT -6
Sit passenger and lets go! !!!!!!!
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Post by nelson480 on Sept 7, 2011 22:43:51 GMT -6
lol ok
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Post by kyngofpop on Sept 8, 2011 0:12:38 GMT -6
Yep, non-autobahns are limited to 110, autobahns to 140. The only reason they can make one higher is by specifying the higher speed V-rated tires instead of standard S-rated. It's possible to get the pcm reprogrammed to change the limit, but you better have tires and skill to match. I know a certain Autobahn Aurora that hit 143.3 mph based on GPS  before the computer started yanking at the chain. |
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Post by beastboy1976 on Sept 8, 2011 7:10:27 GMT -6
Since were on this subject... today me and Nelson had a mini meet and raised a question. Please verify. What is the easiet way to tell if u have an Autobahn or non V rated tires when you check the door jam sticker |
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Post by Marc on Sept 8, 2011 7:36:06 GMT -6
Additional Autobahn identification: Look at the build sheet sticker, somewhere in the trunk for 2 codes:
QQX = Autobahn
FV4 = 3.71 axle ratio
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Post by aba1987 on Sept 8, 2011 10:11:19 GMT -6
Ooo ok i do have an Autobahn then
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Post by beastboy1976 on Sept 8, 2011 16:31:54 GMT -6
Yup me too. I love my car. Cant wait to get all my 02 sensor and Vaccum issues resolved so I can finally feel how she is trully supposed to perform.
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Post by 71corvette454 on Dec 29, 2012 7:26:49 GMT -6
Hey, I know this thread is super old, but I was just browsing my bookmarks and noticed it. yep and if you program out the speed limiter on a non autobahn it would be even faster than an autobahn by 3-5 mph I wouldn't be so sure really... I mean of course it would if the top speed only depended on the ratio and engines highest achievable rpm. But let's see - the non-autobahn cuts off at 110 mph, 4th gear locks in and it's running at like 3000 rpm. That means that at - let's say - 150 it'd be at... let me count that just quickly: 3000*150/110=4091 rpm, while an autobahn would already have 4091*3,71/3,48=4361 rpm. Now if you look at Auroras Power diagram, for example one from the brochure that electrostatictommy uploaded some time ago:  you can see that the highest power is available at just over 5500 rpm which is way higher than that and until we reach that point, the power is increasing more less proportionally to the rpm. Now that means, than everywhere under 5500 rpm the autobahn will have more power (because of more rpm) and therefore will accelerate better (or at all). So the conclusion is, that if Auroras "natural" top speed is achieved over 5500 rpm (for a non-autobahn that would be at least 110*5500/3000=202 mph), than yes, non-autobahn would be faster. But I think we'd all agree they couldn't go that fast  which leads us to our final conclusion: without the speed governor the Autobahn would still be faster than a non-Autobahn  Am I right? |
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Post by wireless on Dec 29, 2012 8:02:14 GMT -6
the non-bahn would, based upon gearing limitations, have a higher top speed - but the autobahn would get to it's faster.
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Post by 71corvette454 on Dec 29, 2012 9:28:44 GMT -6
Ok, but why? Where am I wrong, because I still think I'm not The thing that limits the theoretical top speed isn't the highest achievable rpm. Well, I think I know what you're thinking - at the same rpm the non-bahn is going faster the autobahn. That's right, but only if it has enough power to get to that speed. Because at the same speed the "resistance of air" (is that how you call it in English?) and road is obviously the same for both cars, but since the autobahn's running on higher rpm, it has more power. At some point the power of resistance is equal to the power on the wheels coming from the engine - that's where vehicle's top speed is. Let's say it'd be 150 for the non-bahn. Autobahn at 150 would have higher rpm and therefore (we can see it on that diagram) it will have more power which means it can still accelerate a little. And it's like that as long as higher speed means more power - that is to around 200 mph. |
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before the computer started yanking at the chain.
which leads us to our final conclusion:
