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Post by Custom88 on Jun 6, 2005 22:41:35 GMT -6
Just gathering some info on the shift points for the different engine/transmission combinations. Post your year, autobahn yes/no, etc.
ME: 2001 V6 Aurora 3.27 gear ratio WOT 1-2 shift occurs at 49MPH@6,600 RPM WOT 2-3 shift occurs at 92 MPH @ 6,400 RPM
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Post by omegaic on Jun 6, 2005 23:33:21 GMT -6
'98 autobahn...at WOT every shift is right around 6500.
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Post by stevensolds on Jun 7, 2005 4:37:33 GMT -6
wow....95 is 6000 for me.
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Post by macadamiaman on Jun 7, 2005 8:37:50 GMT -6
I thought the 2001+ was 3.71 ratio like the autobahn?
I'll get some info on mine, too
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Post by Letitroll98 on Jun 7, 2005 9:14:00 GMT -6
Not on the 3.5L.
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Post by Aurora40 on Jun 7, 2005 19:34:02 GMT -6
1st to 2nd: 56mph at 7,000 rpm 2nd to 3rd: 84mph at 7,000 rpm 3rd to 4th: haven't done that one yet at 7,000 rpm! But it would happen at 116mph. 4th to 5th would be at 151mph, and 5th can carry the car all the way to 201mph if the car made enough power.
Oh, sorry, right... (watches karma get slammed)
The Aurora will snap off the 1-2 shift at 6500 rpm when the selector is in "2". Otherwise anywhere from 5800 to 6400 depending on how early on you floor it, how well warmed up the car is, etc. I'm not sure of the speed. I'm usually not looking at the speedo.
2nd to 3rd is usually more like 6200-6400 rpm for some reason, in the area of 75-80mph. The first track visit in the Aurora, 3rd was a real dog. The second visit, it pulled hard and strong in 3rd, hence the difference in trap speeds and of course ET.
Dan, with your slightly higher redline and taller final drive, you can run the 1/4 with only one shift. That should be an advantage for sure. Finishing in the power curve at the very top of 2nd.
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Post by Aurora40 on Jun 7, 2005 19:36:29 GMT -6
Oh, specs:
2002 Aurora 4.0: 3.71:1 final drive, 6500 rpm advertised fuel cutoff and 1990 Corvette 5.7: 3.45:1 axle ratio, 7200 rpm advertised fuel cutoff. And let me tell you, carrying 2nd gear all the way to 85mph in a 375hp car is wicked fun! I swear it's swinging for the limiter before you even realize you are exceeding the speed limit!
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Post by Marc on Jun 7, 2005 19:43:19 GMT -6
The Aurora will snap off the 1-2 shift at 6500 rpm when the selector is in "2". Otherwise anywhere from 5800 to 6400 depending on how early on you floor it, how well warmed up the car is, etc. I'm not sure of the speed. I'm usually not looking at the speedo. 6500 in 1st with the 235/55R-17 tires & 3.71 axle would be 46 mph. ___________________ GM!!! BRING BACK OLDS!!!
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Post by Aurora40 on Jun 7, 2005 20:18:52 GMT -6
6500 in 1st with the 235/55R-17 tires & 3.71 axle would be 46 mph. ___________________ That would mean the 2-3 shift at 6200 rpm would be 79mph. I believe it's sooner than that on my car, and it may have gone to 6400rpm at the track. I suspect any calculator you used can't take into account torque convertor slip. But I'm sure it's around there. It's not going to be as exact on an automatic.
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Post by stevensolds on Jun 7, 2005 21:28:16 GMT -6
;DDan you should come to Carlisle with us...i want to race the 3.5 just for S & G's.
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Post by Letitroll98 on Jun 8, 2005 6:05:04 GMT -6
Yes, I wonder what we'd have to do to keep 40 from bringing the ZR1 instead of the Aurora that weekend? (You're thinking about it Bob, don't deny) Oh, that's right, the fairgrounds are dirt and grass, no tarmack. No way he'd expose the Vette to that abuse.
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Post by Aurora40 on Jun 8, 2005 11:57:10 GMT -6
Yes, I wonder what we'd have to do to keep 40 from bringing the ZR1 instead of the Aurora that weekend? (You're thinking about it Bob, don't deny) Oh, that's right, the fairgrounds are dirt and grass, no tarmack. No way he'd expose the Vette to that abuse. ;DDan you should come to Carlisle with us...i want to race the 3.5 just for S & G's. I don't really want to bring either car where it'll be gravely and yokels will try to touch it. Maybe I'll just show up in the Buick! Steven, you can line up against a slow octogenarian's-dream Buick and see how you do. At least I'll be able to get in and out of my fogey-mobile easily.
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Post by Aurora40 on Jun 8, 2005 12:06:27 GMT -6
Dan, with your slightly higher redline and taller final drive, you can run the 1/4 with only one shift. That should be an advantage for sure. Finishing in the power curve at the very top of 2nd. To steer back on topic, I thought this was interesting. Not having to hit 3rd, which is of course the wasted time of a shift, but also the weaker acceleration of a higher gear, and of dropping to the low end of the power band, is a real advantage. The car might run pretty well in the 1/4. If you ever consider doing it Dan, do it. It's a lot of fun. Plus, it's a chance to punch it flat out from a stop up to about 90mph. Any idea what the power curve of the 3.5L looks like after the power peak? Does it drop off much or stay somewhat flat?
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Post by 95mushroom on Jun 8, 2005 12:32:14 GMT -6
Dan, with your slightly higher redline and taller final drive, you can run the 1/4 with only one shift. That should be an advantage for sure. Finishing in the power curve at the very top of 2nd. That's a really good point. At the track, it shifted into third for the last 3 or so seconds I think it hurt the time a bunch. I'm also pretty confident that Dan would destroy my 16.3 time as well.
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Post by Custom88 on Jun 8, 2005 13:28:17 GMT -6
if I would guess I"d have to say that the V6 Aurora would be in the mid to high 16's.. I know my supercharged Riviera was mid/low 15's and the aurora feels no where near as fast as the Riviera did. The torque is just awesome with the s/c 3800. The DOHC engines don't start pulling hard until after 4,000 RPM. The 3800 will pull hard right from 2000 RPM and all the way up to 4,500. the 3.5 is torquey off the line but I don't think it'd save it. It doesn't have enough top end.
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Post by stevensolds on Jun 8, 2005 14:00:49 GMT -6
Bob please bring the aurora...i want to see if it looks any better in person....
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BNICOV
Aurora Lover
Posts: 782
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Post by BNICOV on Jun 8, 2005 15:47:12 GMT -6
The SC'd Regal would probably be quicker in the 1/4 that a 3.5 or even a 4.0 for that matter, however, the 3.5 and 4.0 are a heck of a lot smoother. If you want crazy acceleration, buy a 2 door sports car with a big engine (like a ZR-1). If you want comfort and practicality, you got it right now.
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Post by JimW on Jun 8, 2005 16:05:46 GMT -6
Most stock SC'd Series II 3800's run 14.8 stock. I've seen 12 second Bonnevilles (driven it actually)
My shift points btw are consistant with everyone else that has posted a Classic Autobahn Aurora
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Post by oldsauroraman1 on Jun 10, 2005 22:07:41 GMT -6
Hmmm. The 3800S2 surely does get up and go. But, does not have the torque or top end of the Northstar.
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Post by Custom88 on Jun 10, 2005 23:09:24 GMT -6
Hmmm. The 3800S2 surely does get up and go. But, does not have the torque or top end of the Northstar. huh? torque? the northstar engines are gutless until they are allowed to get above 4,000 RPM. the 3800 has its max torque at under 4,000 RPM. It's more like max torque at 3,200 RPM. The aurora has max torque at near 5,000 RPM! The top end of the northstar is barely better than the 3800 anyways.
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Post by Aurora40 on Jun 11, 2005 8:03:39 GMT -6
I did an overlay of the two torque/power curves sometime back. I'll dig it up and post it.
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