Re: calculating peak rpm hp
[Re: mopar dave]
#2536101
08/14/18 12:03 PM
08/14/18 12:03 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,514
So. Burlington, Vt.
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When you really wanna know, you dyno it.
Other than that, it’s just a guesstimate.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: calculating peak rpm hp
[Re: mopar dave]
#2536367
08/14/18 07:48 PM
08/14/18 07:48 PM
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Joined: Mar 2009
Posts: 2,470 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,470
Sydney,Australia
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Yeah, i understand. Just looking for a guess anyway. Not sure where to shift this 511 at once i get to the track. 330cc heads and a 270@50 solid cam. Seems to pull hard to upper 6000 range. Thanks Solid roller or flat tappet ? For what it is worth , my 505 with a 272@050 solid flat tappet .5400ish converter , 4.1 gear 28"radial . Chassis dyno always showed peak HP at converter stall(5100 footbrake vert) , but motor pulled to 6500 without any drop off With CNC source heads , Victor and 4150 prosystems carb I shifted at 6000 . 10.50s . I tried a little more not big gain , but it never seemed to give up under 7000 with either converter . With TF270 heads , bigger tbrake vert , Super Victor and 1050 dominator . I only ran this a couple times . BUT shifting at 6000 it didn't fall back onto converter , shift light stayed on @6000 - so stall increased . 10.25@130 . I believe with the bigger heads it wanted a higher shift probably 64-6600 which would have allowed rpm drop back to converter on shift That is now to be another day , due to block issues . Why the low shift ? It ran the numbers I wanted and was doing it easily at low stress . Tex
Last edited by tex013; 08/14/18 07:50 PM.
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: calculating peak rpm hp
[Re: mopar dave]
#2536665
08/15/18 11:30 AM
08/15/18 11:30 AM
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Joined: Jan 2003
Posts: 11,725 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,725
Portage,michigan
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Not rocket science. Just try shifting it at different rpm and see what makes it ET best. Try it at 66, 68 and 7000 and see what it likes best.
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: calculating peak rpm hp
[Re: B3422W5]
#2536730
08/15/18 01:33 PM
08/15/18 01:33 PM
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Joined: Aug 2003
Posts: 43,284 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,284
Bend,OR USA
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Not rocket science. Just try shifting it at different rpm and see what makes it ET best. Try it at 66, 68 and 7000 and see what it likes best. I start with 500 RPM increments and the go to 100 after finding the highest and lowest shift points, especially on putting any new parts in the car, converter, cam, jetting and so on
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: calculating peak rpm hp
[Re: mopar dave]
#2536788
08/15/18 03:34 PM
08/15/18 03:34 PM
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Joined: Jan 2003
Posts: 11,725 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,725
Portage,michigan
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For sure, but thought i might try short shifting at 6000 to start. Then 6500 and go from there. Any such way like that will ultimately find out what i likes best. Love ya man, but frankly you make things more involved and harder than anybody that has ever posted on here... lol
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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Re: calculating peak rpm hp
[Re: mopar dave]
#2536813
08/15/18 04:46 PM
08/15/18 04:46 PM
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Joined: Jan 2003
Posts: 11,725 Portage,michigan
B3422W5
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 11,725
Portage,michigan
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Just who i am. I leave no stone unturned if possible. I like the opinion of others as well. Wheres the harm and besides, this site would pretty slow if no one was asking questions simple or not. Never said there was any harm in it, but in this thread( like some others) you answered your own question. ....... try different rpms till it runs the best...... way early in the thread. I suspect you already knew that to be the answer. Thats my only reason for saying what i said
69 Dart GTS A4 Silver All steel, flat factory hood, 3360race weight 418 BPE factory replacement headed stroker, 565 lift solid cam Best so far, low 10.30’s 1/4 1.41 best 60 foot 6.56 at 104.17
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