 Car feels faster than it is and interesting loss of power in higher RPM, Went and did a dyno run to see what my car produces. |
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| Michael N |
 Oct 31 2012, 03:10 PM
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#1
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Certifiable  Group: Members Posts: 1,432 Joined: 6-June 04 From: San Jose, Ca Member No.: 2,164 Region Association: Northern California  |
Today I had there afternoon off and went to a local shop to get a dyno run on my car to see what it actually produces rather than me guessing on what it produced. The local shop was running a special of 3 pulls for $85.00. The shop actually did 4 pulls and we awesome with me and my car. They are used to seeing high HP muscle cars etc but didn't pick on my car too much for being so low in HP. They did the pulls in 4th gear. The shop uses a dynapack dyno that bolts to the hubs which I like as there is no need for tied down points. Overall I am happy with the results as the engine is now 40 years old without a rebuild yet. It is a 2.4 liter 911S engine with MFI and produced 141.2 at the wheels.
What would cause the power to drop consistently between 6000 and 6500 Rpm? It drops and come back on again.   |
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| gothspeed |
Oct 31 2012, 07:21 PM
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Senior Member Group: Members Posts: 1,539 Joined: 3-February 09 From: SoCal Member No.: 10,019 Region Association: None |
what kind of manifolds and what diameter are the intake runners, top to bottom and length? What kind of exhaust, headers runner diameter/length/ collector type, muffler?
What size are your valves, intake/ exhaust and what are your cam specs? Is your fuel pump getting enough juice? what kind of air cleaner set-up? |
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| Michael N |
Nov 1 2012, 11:15 AM
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#3
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Certifiable Group: Members Posts: 1,432 Joined: 6-June 04 From: San Jose, Ca Member No.: 2,164 Region Association: Northern California |
QUOTE(gothspeed @ Oct 31 2012, 05:21 PM)  what kind of manifolds and what diameter are the intake runners, top to bottom and length? What kind of exhaust, headers runner diameter/length/ collector type, muffler? What size are your valves, intake/ exhaust and what are your cam specs? Is your fuel pump getting enough juice? what kind of air cleaner set-up? Everything was pulled out of a wrecked 1973 911S back in 1978. The car came into EASY auto dismantlers and the PO had a connection there to get it complete. I believe that it is all original for that car including the air cleaner. The muffler is a modified (changed the angle of he tip to match the rear valance) 911 unit and running original 914-6 heat exchangers. |
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Posts in this topic
Michael N Car feels faster than it is and interesting loss of power in higher RPM Oct 31 2012, 03:10 PM
brant did they run an Air fuel ratio while on the dyno?
... Oct 31 2012, 03:16 PM Cap'n Krusty While not real common with the S pumps, there... Oct 31 2012, 04:23 PM
gothspeed Here are some dyno graphs from various 911 Carrera... Nov 1 2012, 01:54 PM messix if you are using carbs it could be a harmonic stan... Nov 1 2012, 09:52 PM brant jetting... (using old fashioned language)
worn 3d... Nov 2 2012, 08:13 AM
charliew Put a af sniffer in the tail pipe and don't as... Nov 2 2012, 08:25 AM gothspeed
Put a af sniffer in the tail pipe and don't a... Nov 2 2012, 08:56 AM |
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