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Discussing Please Help With High Rpm Miss in the 5.0 Mustangs Forum. Having a problem, i can't get my 347 to spin over 5500 rpm. it'... Modded Mustangs is the premier Ford Mustang Forum on the internet. We discuss all aspects of the Ford Mustang on the forum. Registered Users do not see the above ads. Please Register - It's Free! |
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September 30th, 2007, 02:56 PM
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#1 |
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Regular
Join Date: Nov 2006
Posts: 122
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Please Help With High Rpm Miss
Having a problem, i can't get my 347 to spin over 5500 rpm. it's like the car is hitting a rev limiter, but the only problem is that the car dosen't have one...
brought it to the dyno a few months ago and she had no problem spinning to 6000 its like it happened overnight damn mice any ideas????
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518.9 Wheel HP!!!!! 491 Torque!!!!!!!! |
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September 30th, 2007, 02:58 PM
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#2 | ||
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From the land of the wolverines
1986 Mustang GT
Join Date: Apr 2007
Location: Smothering v606er with a plastic walmart bag
Posts: 7,283
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sounds like preignition like your running to low of octane of gas
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September 30th, 2007, 03:01 PM
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#3 |
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Regular
Join Date: Nov 2006
Posts: 122
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im running 104 octane but thanks for replying
do you think i may have a bad distributer
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518.9 Wheel HP!!!!! 491 Torque!!!!!!!! |
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September 30th, 2007, 03:02 PM
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#4 | ||
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From the land of the wolverines
1986 Mustang GT
Join Date: Apr 2007
Location: Smothering v606er with a plastic walmart bag
Posts: 7,283
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could be spark then not getting enough spark or timing not right
 you got me on this one
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September 30th, 2007, 03:10 PM
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#5 |
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Newbie
Join Date: Sep 2007
Location: athens, alabama
Posts: 31
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sound like it could be timing
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September 30th, 2007, 09:11 PM
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#6 |
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MM Fanatic
1989 Mustang LX 5.0
12.86@ 111mph
Join Date: Apr 2007
Location: Massachusetss
Posts: 4,533
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yeah doesnt sound like a bad distributor, maybe its the spark..but my bet is on the timing is WAY off..but still close enough to run..
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 1989 Mustang LX 5.0 Stock w/ F303 cam and 1.6 Roller Rockers BBK Shortys, BBK o/r H, Flowmaster Super 44s "The LS1 was subject to a paternity test!!! The results are back....03 cobra you are the Father!!!!" |
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September 30th, 2007, 09:31 PM
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#7 | |
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MM Fanatic
1987 ford mustang gt
well see when shes done
Join Date: May 2007
Location: mascot, tn
Posts: 4,733
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what compression ratio does the motor have???
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347 stroker little street car yea its slow!! 
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September 30th, 2007, 09:58 PM
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#8 |
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MM Fanatic
1989 Mustang LX 5.0
12.86@ 111mph
Join Date: Apr 2007
Location: Massachusetss
Posts: 4,533
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im gunna say like 11:1 or 12:1 as a guess..
__________________
1989 Mustang LX 5.0 Stock w/ F303 cam and 1.6 Roller Rockers BBK Shortys, BBK o/r H, Flowmaster Super 44s "The LS1 was subject to a paternity test!!! The results are back....03 cobra you are the Father!!!!" |
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October 1st, 2007, 09:54 PM
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#9 |
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Enthusiast
Join Date: Aug 2005
Location: Va Beach VA
Posts: 586
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I bet electrical.
Replace wires cap rotor and coil and try again. PS: the resin it did not do it on the dyno is that the dyno does not load the motor like the real world does.
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