 Dyno results, What should my expectations be? |
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| D1A3 |
 Mar 31 2006, 01:17 PM
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#1
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Gruppe Neun Vierzehn Südosten  Group: Members Posts: 362 Joined: 3-June 04 From: Atlanta, GA Member No.: 2,152 Region Association: South East States  |
It looks like I will have an opportuity to get my recently rebuilt (to stock spec) 2.0 engine (no smog, D-Jet FI) dyno'd tomorrow. I know what all of the books say about HP, torque etc, but should I expect to achieve those numbers realistically?
I'm asking because HP at the rear wheels is differnt than HP at the flywheel, right? Anyways, just trying to get a feel for what my expectations should be so when we put it up on the Dyno I know if the results are good or not. |
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| messix |
Mar 31 2006, 01:29 PM
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#2
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AKA "CLUTCH KILLER"! Group: Members Posts: 6,995 Joined: 14-April 05 From: between shit kickers and pinky lifters/ puget sound wa.north of Seattle south of Canada Member No.: 3,931 Region Association: Pacific Northwest |
take a wag [wild ass guess] then divide that in half. it will be dissapointing. prolly bout 65-70hp at the wheels.
chassis dyno come out low cause the engine is driving the accesories like alt. and air pump if its smogged, and the drag thru the gears of the tranny and dif. all add up to some horse power4 loss to the wheels. |
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| Mueller |
Mar 31 2006, 01:47 PM
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#3
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914 Freak! Group: Members Posts: 17,146 Joined: 4-January 03 From: Antioch, CA Member No.: 87 Region Association: None 
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15% to 20% lower wheel hp is the average numbers thrown around for drivetrain loss........so 80ish HP should be within sight...
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| lapuwali |
Mar 31 2006, 02:03 PM
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#4
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743  |
Assuming the factory number of 95hp is accurate. The actual measured peak seems to be under 90hp. I'm going to guess 75hp at the wheels. |
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| Jake Raby |
Mar 31 2006, 02:44 PM
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#5
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
with 3 different engines my 914 made within 2HP of losing exactly 25HP @ the wheels compared to the dyno results at the flywheel on my dyno...
All engines were greater than 170HP at the flywheel. |
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| Jeff Nelson |
Mar 31 2006, 02:58 PM
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#6
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Newbie Group: Members Posts: 31 Joined: 27-July 05 From: Santa Rosa, CA Member No.: 4,487 |
Which is about 15%. Here are some good discussions of the flywheel vs driving wheel differences: http://www.pumaracing.co.uk/coastdwn.htm http://www.pumaracing.co.uk/power3.htm http://www.sdsefi.com/techdyno.htm |
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| Bleyseng |
Mar 31 2006, 05:49 PM
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#7
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Aircooled Baby! Group: Members Posts: 13,034 Joined: 27-December 02 From: Seattle, Washington (for now) Member No.: 24 Region Association: Pacific Northwest |
Most 95hp stock 2.0L dyno out around 75-80 hp depending on their condition.
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| gregrobbins |
Mar 31 2006, 06:57 PM
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#8
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Member: Team NARP Group: Members Posts: 1,515 Joined: 23-March 04 From: Arizona Member No.: 1,844 Region Association: Southwest Region |
Beck just had his done and pulled 82 HP on stock 2.0L with D-Jet. Gerard got 95 at the wheels with a cam, euro pistons, some head work, and MegaSquirt.
Here is a shot Gerard, his daughter and his car. |
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| jniemeier |
Mar 31 2006, 11:14 PM
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#9
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Newbie Group: Members Posts: 18 Joined: 7-December 03 From: Western New York Member No.: 1,424 |
Mine made 86hp at 4600rpm at the rear wheels from a totally stock '73 2.0 DJet. It runs at 13.0 to 13.7 A/F at WOT but 15 or just a bit over at steady cruise. Not bad for 1969 era fuel injection control. If you don't like it like that at cruise, adding resistance to the cylinder head temp sensor line richens it about 0.7 A/F for each 100 ohms. At least that's my experience.
Jim in Rochester, NY '73 2.0 Bahia Red PS: That 18k$ car at Barrett J. doesn't look Bahia Red to me. Not enough orange to it. |
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