4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

Missing HP...

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Old Dec 24, 2006 | 10:23 PM
  #1  
phalcrow's Avatar
phalcrow
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Joined: Oct 2006
Posts: 298
From: CA
Default Missing HP...

So, I got my dynorun with my new setup and on the dyno I only gained 28 RWHP. It was running a bit rich, the guy said 3% rich, but I only put down 289 RWHP. I couldn't tune it right then because my SCT wasn't powering up, but I eventually fixed the problem. Anyway, only 28 RWHP with the following changes (on the same dyno as before):

Stock PI heads to ported PI heads
Comp stage 1 cams to Comp stage 2 cams
10.5:1 compression to 11.5:1 compression
BBK shorties to MAC long tubes
H-pipe to Prochamber
Stock T/B to 75mm T/B
Stock plenum to C&L plenum
87 octane to 91 octane
Canton windage tray
261 RWHP to 289 RWHP (running a bit rich)

Tell me if this sounds right. Keep in mind that this was done at 2600 ft elevation, 55 degrees and not sure the name of the dyno.
Old Dec 24, 2006 | 10:26 PM
  #2  
SOHCtimes2's Avatar
SOHCtimes2
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Joined: Jan 2006
Posts: 2,375
From: Orange County, California
Default RE: Missing HP...

Looks right to me, get the A/F leaned out where it needs to be will pick you up a decent bit more aswell.
Old Dec 24, 2006 | 10:29 PM
  #3  
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phalcrow
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From: CA
Default RE: Missing HP...

Ya, I took it back 4% because the tuner would only to 2 or 4%, not 3%. The guy said I should go over 300 RWHP with the a/f corrected. I just figured after all those mods I would pick up more power than that. Oh well, I guess real dyno hp is not even close to advertised hp.
Old Dec 24, 2006 | 10:36 PM
  #4  
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SOHCtimes2
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Joined: Jan 2006
Posts: 2,375
From: Orange County, California
Default RE: Missing HP...

Not even close at all, plus the 2v heads suck. Throw some 4v heads on and it would be a different story.
Old Dec 24, 2006 | 10:51 PM
  #5  
phalcrow's Avatar
phalcrow
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2nd Gear Member
 
Joined: Oct 2006
Posts: 298
From: CA
Default RE: Missing HP...

Ha, maybe next year... I already pulled the motor 3 times and went with 2 different setups this year. Next year: 4v heads, low compressionand a twin screw.
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