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Join Date: Mar 2016
Posts: 28
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Can you estimate my horsepower
Looking to see if anyone can help guess an approximate horsepower or horsepower increase from these rebuild specs:
1982 3.0 rebuilt to a 3.2 short stroke 98 mm piston set Increased compression to 10:1 Polished cylinder heads Polished cam Weber 40IDA3C carburetors XDI ignition Dansk sport muffler Heat exchangers Removed weight 2,400 lbs |
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02-01-2025, 03:00 PM
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How many stickers do you have on your car?
That's the only way we can guess your HP
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Instagram.com/timofthevalley |
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02-01-2025, 05:09 PM
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Join Date: Jun 2000
Location: bottom left corner of the world
Posts: 22,787
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What are the before and after seat of your pants horsepower estimates.
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02-01-2025, 10:24 PM
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Join Date: Mar 2016
Posts: 28
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180 stock 200-220 after
Great low end torque and absolutely screams from 3,500 to redline. So much fun and can’t help but think it’s the higher end of my estimate Last edited by Jpicardi; 02-02-2025 at 03:05 AM.. |
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02-02-2025, 03:02 AM
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You can use a dyno app on the smartphone. Most of them are crap, but also a few may work pretty well. I know a german app which is able to correct the 1Hz GPS positioning of most smartphones pretty well
You have to enter specific values of the car like weight, transmissions rates, drag coefficient etc. Best is of course an external 10hz GPS mouse for that but the app may correct it pretty well with all correct values: https://www.gps-laptimer.de/ => Products => (bottom of page) Harrys Dyno https://play.google.com/store/apps/details?id=com.harrys.dyno https://itunes.apple.com/app/harrys-dyno/id1148400332 Thomas
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1981 911 SC Coupé, platinum met. (former tin (zinc) metallic), Bilstein shocks, 915/61,930/16,WebCam20/21, Dansk 92.502SD,123ignition distributor with Permatune box as amplifier,Seine Systems Gate Shift Kit,Momo Prototipo. Want to get in touch with former owners of the car. Last registration in US was in 2013 in Lincolnshire/lL. Last edited by Schulisco; 02-02-2025 at 04:34 AM.. |
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02-02-2025, 04:30 AM
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It’s all going to depend on the cams + carbs (aka the tune). Could be anywhere between 220rwhp and 255rwhp.
I’ve seen Steve Wong and others post solid ~250rwhp data from well-tuned 3.2SS builds, but powerband/curve will dictate a lot here. Why not get it dynoed? Couple of hundred to get a few pulls in and then you have the data!
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1978 911 SC (3.2SS, EFI, 993SS cams + the trimmings) Dynamic CR calculator: https://dcr.questionable.services/ Last edited by silverlock; 02-02-2025 at 12:00 PM.. |
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02-02-2025, 05:24 AM
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Last edited by silverlock; 02-02-2025 at 05:28 AM.. |
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02-02-2025, 05:26 AM
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Driver, not Mechanic
Join Date: May 2013
Location: SF Bay Area
Posts: 3,008
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How far are you from a place that offers dyno rentals?
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02-02-2025, 06:15 AM
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Join Date: Mar 2019
Posts: 1,626
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Get a dragy and an open road and find out. The trap speed in the 1/8 or 1/4 mile (NOT the E.T.) can be entered into any of the decades old online calculators, since you know the car's weight. More accurate than lots of chassis dynos where the tire pressure can be changed to manipulate the hp reading. And don't get me started on the "fudge factors" most operators use.
https://dragymotorsports.com/ |
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02-02-2025, 07:39 AM
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With stock cams I think close to 225.
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Walt 82SC 3.0 81SC 3.6 |
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02-02-2025, 11:40 AM
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Porsche 911 SC
Val
