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#41
10-09-2022, 08:15 PM
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Is it just me or we are making a mountain out of Mole hill on a street pontiac?I can give a rats a-s about 5-10 HP!JMHO,Tom
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#42
10-09-2022, 11:10 PM
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#43
10-10-2022, 07:28 AM
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Interesting discussion. I'm always looking for 5-10 HP in our street cars but I've never went after it through the alternator. Always figured there wasn't much there.
I have played with fans however. |
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#44
10-10-2022, 10:22 AM
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A set up using electric fans only for cooling. I've seen it stated by some who track tested with the fans on and with them off, results were no measurable difference in ET & MPH.
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__________________
'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
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#45
10-10-2022, 12:59 PM
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I always shut my fans off right before staging, but I didn't run an alternator. I wanted all battery power going to ignore and fuel pump.
Last edited by slowbird; 10-10-2022 at 01:05 PM. |
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#46
10-10-2022, 01:11 PM
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We just race our street cars right off the street with working clutch fans and alternators, half the time don't even open the hood. Easy Peasy
 Shucks last time at the track dad had a starter issue and just left the darn thing running in the staging lanes |
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#47
10-10-2022, 01:47 PM
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#48
10-10-2022, 02:09 PM
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#49
10-10-2022, 04:30 PM
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It was once popular to run a tiny import car alternator both for weight and parasitic drag reduction.
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Triple Black 1971 GTO |
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#50
10-10-2022, 04:56 PM
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Most all of the GM solid lifter cars had underdrive deep groove alternator pulleys to go along with the rest of the deep groove pulleys. Doesn't spin the alternator as fast as the typical conventional pulley.
My Z still has it's original setup on the factory 37 amp alternator. I had another one of those alternator pulleys I ran on the Chevelle for years. Same 37 amp alternator. Doubt it does a darn thing for HP but it sure helps keep the belt on when you zing it. I later switched to a 55 amp alternator, same pulley. I later switched back to the stock tiny steel pulley to up the juice during idle conditions. Maybe I lost a 1/2hp 
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#51
10-10-2022, 05:52 PM
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I’ve played with cutting out the alternator field via a switch. Yes, it did yield a slight improvement at the track. Mine was .02-.03 reduction in et best I could tell…
Problem I had was my fuel pump would slow down a bit with the reduced voltage. At times this would prove detrimental. IF the fuel pump kept me in fuel, cutting the field reduced my et slightly. Removing the power steering pump belt generally gives me an easy .05 or more…. Both mods get me close to a .10 in et reduction as I recall.
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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile |
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#52
10-10-2022, 08:16 PM
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In reality, the Alternator is drawing < 1 hp at cruise. 1/4 mile acceleration would be a few HP lost.
Nobody 1/4 miles with a dea battery, Hi-beams, and a 30 Amp electric fan all running. My electric fan only goes on when i turn it on: really long traffic lights, jams, and after the 1/4 mile run. |
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#53
10-12-2022, 11:37 AM
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#54
10-12-2022, 03:26 PM
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__________________
1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
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#55
10-12-2022, 03:41 PM
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Agree the Mark VII uses a bunch of amps to drive that electric fan.
At one time that was a very good fan for a engine pulling a trailer and race car. Depends on what your application is, simple really. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#56
10-12-2022, 06:53 PM
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Craaap. My elec fan is in the 15-20 A catagory, a GM upullit deal. Sold my identical spare.
May be putting the flex fan back on some day. |
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#57
10-13-2022, 12:55 PM
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There MUST be some merit to the question. My Wifes 2020 Nissan Daily driver has a small, but powerful alternator ( around 100a)
This small alternator has a CLUTCH inside it, similar to a clutch on a AC pump... You cant see it. I would have never known except the belt would flutter and make noise, so the whole $500.00 alternator got swapped under warranty. I am betting Other brands have gone to this for fuel economy reasons... so it IS worth discussing.. There ARE reasons you will NEVER see a alternator on a EV....
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather Last edited by Formulabruce; 10-13-2022 at 01:07 PM. |
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#58
10-13-2022, 12:57 PM
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The Final test on the engine masters video WAS the factory clutch fan and shroud. This was edited OUT of the video. Why? because it used the LEAST power, and because it really puts a damper on aftermarket "sponsors" of motor trend. Its sad this classic info is missing, it was a huge shocker to them...
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"The Future Belongs to those who are STILL Willing to get their Hands Dirty" .. my Grandfather Last edited by Formulabruce; 10-13-2022 at 01:05 PM. |
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#59
10-13-2022, 01:18 PM
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Interesting thread. My guess is 95% of street cars would find more power in a better camshaft design than the least efficient designed alternator would take away power wise.
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#60
10-13-2022, 01:25 PM
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The only thing that beat the clutch fan setup, was no engine driven fan at all. |
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