Where is the HP curve for Vin "C"'s. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-02-2005, 02:52 AM   #1
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Default Where is the HP curve for Vin "C"'*.

what is the vin "C"'* HP and Torque curve???

Is the Bellhousing bolt pattern on our Vin "C"'* considered a metric pattern??
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Old 02-02-2005, 04:13 AM   #2
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I've never seen the actual horsepower and torque curves for a vin C, but if anyone has them, I'd love to see them.

I'm assuming that you already know the peak HP and torque, but if not:

165 [email protected] rpm
220 [email protected] rpm

And the bolt pattern, I've got no clue.
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Old 02-02-2005, 07:37 AM   #3
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Bolt Pattern? You mean the bolts? Yes, they would be in Metric.. however I don't know what you mean by 'pattern.'


-justin
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Old 02-02-2005, 07:55 AM   #4
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bellhousing bolt pattern == what tranny will this bolt to?

Figure tq peak around 2500, hp at 4500-5000.

Post # 3000 for me BTW.
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Old 02-02-2005, 10:20 AM   #5
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torque curve? way down low. wayyyyyyyyyyy down there.

And nothing up top..
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Old 02-02-2005, 10:39 AM   #6
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This is somewhat confusing. Most agree that the peak torque (210 lb-ft) is at 2000 rpm but there is some disagreement about whether the peak hp (165) is at 4400 rpm or 5200 rpm. Frankly I suspect that the 4400 rpm figure is correct. Marginally possible is that *both* are correct which would give 196 lb-ft of torque at 4400 rpm and 167 lb-ft at 5200.

Requardless, my impression is that pushing a stock "C" 3800 past 5000 rpm may be possible but is beating a dead horse but between 1600 and 4400 the torque curve is very flat with at least 100 lb-ft at 1200 rpm.

Keep in mind that this is net HP used by GM since 1971 and not the gross HP quoted before that.

Just some reference points, in 1988, the 305 v-8 was rated at 170 hp and the Fiero 2.8 HO engine at 140 hp. Further, the 205 hp rating seen today is more a matter of moving the torque curve further up the rpm range than any increase in torque.

Frankly hp is nice but I am really more interested in the torque.
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Old 02-02-2005, 10:54 AM   #7
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Everybody loves torque, but I personally am willing to give a wee bit of low end (in which a slightly shorter final drive could easily make up for it) in order to be able to take the car to 4000rpm and not have the engine stand me up. As in, it'll shine *anywhere* you rev it.
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Old 02-02-2005, 09:15 PM   #8
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i always thought the torque was in the 190s.
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Old 02-02-2005, 09:21 PM   #9
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Today with an OTC 2000 I watched my RPM'* and found out I cruise at 55 mph at about 1450 rpm'* ,is this what you all are running at while doing 55?? Also I noticed when going up inclines the TCC would stay locked, was just wondering at what RPM would you all consider the engine to be lugging and should the TCC unlock on small inclines??

Thanks
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Old 02-03-2005, 01:32 PM   #10
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Would have to be a 2.84 gear but speedo may be reading a bit high - is that the MPH you read from the OTC (would expect 1450 to be more like 53) or the speedo. Our 88 has a 2.97 gear and pulls an incline smoothly at 1300 rpm in 4th/lockup. OTOH our '90 SE does not engage lockup until over 50 mph so never gets that low.

Both cars have been upgraded to Delco ignitions, the '90 after it began chuggling a bit on inclines.

This is the secret to MPG - turn the engine as slow as reasonable. In the bad old daze the 400 in my station wagon was turning 3200 rpm at 70 and that was with the economy (3.0 axle. At cruise most of the gas was going to pump air through the engine and accellerate the pistons.

Waaay back when we had the first "gas crisis" I got a '67 327 Camaro close to 25 mpg at 70 with very tall (28") rear tires, a 3.31 gear/Muncie trans (no torque converter loss) and mechanical FI. Was an experiment but possible. Today our cars have smaller air pumps, better aerodynamics, and much more control.

Now if all of you driving is stop and go city, 16 mpg is not unusual but even our 3800 TranSport gets 22-23 mpg on a 9 hour 600 mile run (one gas stop and one rest stop) .

Don't forget there was a National Speed Limit in the US of 55 mph when our cars were designed and built, no wonder they perform best in the 50-65 mph region and not to shabby aeven above that.

And if really low RPM is your goal, don't forget that one of the fastest steamboats on the Mississippi, the Robert E. Lee, developed 15 hp at 44 rpm.
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