My 98 R/T has a slight detonation at high RPM when under load after it has
gotten really warm , like after sitting in traffic , etc .
At 02:48 PM 12/17/98 -0800, you wrote:
>I stayed home from work today, taking care of my wife (she has
>bronchitus?)...I had about an hour to run
>around this afternoon...
>
>I called the DYNO shop... They could squeeze me in. So I ran over there,
>had 2 runs done, then got home
>in less than 1 hour. (Just in time to make her something to eat!). Anyway,
>
>Results:
>
>Run #1 was run with new Dynomax Super Turbo Muffler (no more Ultra Flo), 3"
>Car Sound exhaust, 3" exhaust
>from front of CAT to DT headers, and Franks Stage II TB (and a non-burped
>computer).
>
>Previous run was MAX Power = 211.2,
>MAX Torque 277.6
>
>Run number 1= MAX Power = 215.5 (4.3 hp increase) MAX
>Torque 288.8 (11.2 ft lb. increase)
>
>Problem in detonation at high RPM... Thinking this is a TB issue, and/or a
>fuel filter issue-- causing a fuel
>delivery issue at high load/RPM.
>
>Decided to 'burp' the computer to check the performance difference (and
>pinging issue).
>
>Run number 2= Max Power = 216.3 (5.1 hp increase) Max
>Torque 289 (11.4 ft lb. increase)
>
>No pinging was noted, and throttle was rolled on from 1500 RPM, vs. floored
>on run #1
>
>HP and torque numbers were 3-4 hp higher on 2nd run from 1600 RPM to 3000
>RPM vs. run #1 (pinging
>caused a significant drop of HP near the top).
>
>So, based on what I've seen... I'll change my fuel filter/sending unit/fuel
>pump Xmas weekend.... It's due....
>
>And then I might to another run again to see the difference.
>
>Sam '95 SLT
>
>
>
>
>
W . Jack Hilton III
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