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Author
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Topic: New dyno figures with 3" exhaust
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ZEATER
Journeyman Posts: 70
From: Mount Pleasant,IA,USA
Registered: Aug 2001
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posted 10-22-2002 05:51 PM
   
Same dyno 3" exhaust to mufflers gained 19.2 hp (rear wheel) with no other changes. Torque increased 8 ft lbs. Peak torque moved from 3900 rpm to 4200 rpm. How this will work on track I'll have to see. Final figures 382.3 rear wheel horse 408.3 torque.
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Dad Vishus
Gearhead Posts: 418
From: Moscow, Iowa, USA
Registered: Dec 2001
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posted 10-22-2002 05:52 PM
Was that with the same headers?If so, thats pretty significant, I would think
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ZEATER
Journeyman Posts: 70
From: Mount Pleasant,IA,USA
Registered: Aug 2001
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posted 10-22-2002 06:22 PM
Same headers, same jetting and timing. Just ran 3" from headers to mufflers with H pipe. I had H pipe on old system but it was 2 1/2" I could feel a difference at higher rpms and the sound from exhaust seemed to move to th eback of the car.
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Fastymz
Moderator Posts: 9095
From: Reno Nv USA MEM#1240
Registered: Apr 2001
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posted 10-22-2002 06:43 PM
Thats a great increase for new tubes only.  SCOOP ------------------
2.26 60'S
14.9 @ 90.86MPH 65 coupe,351w,C4,Big Boss 429 hood scoop,8"3.40 TracLoc,Cragar SS,Black Suede. https://mustangsandmore.com/ubb/Fastymz.html
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ZEATER
Journeyman Posts: 70
From: Mount Pleasant,IA,USA
Registered: Aug 2001
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posted 10-22-2002 08:15 PM
Cordova is open Saturday for testing. It's suppose to be 54 degrees and no rain. I think I have to go one last time. Maybe I can hit those 11's (without Nitrous) and smile all through the winter.
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Ryan Wilke
Gearhead Posts: 1115
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 10-22-2002 09:45 PM
quote:
Originally posted by ZEATER:It's suppose to be 54 degrees
Not considering the difficulty in getting traction at such low temperaturs, what do most of you guys think is the the lower temperature limit to safely run an "off-road" HiPo engine at 6K - 7K rpms? Because of use of aluminum parts and that you're apt to have fairly loose 0.025" - 0.035" bearing clearances, I'm thinking under 50*F would dramatically increase the risk of hurting your engine.... Ryan
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steve'66
Gearhead Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 10-23-2002 12:10 AM
quote:
Originally posted by ZEATER:
Same dyno 3" exhaust to mufflers gained 19.2 hp (rear wheel) with no other changes. Torque increased 8 ft lbs. Peak torque moved from 3900 rpm to 4200 rpm. How this will work on track I'll have to see. Final figures 382.3 rear wheel horse 408.3 torque.
That doesn't suprise me at all. I wonder how the numbers look with open exhaust.  IMHO anything that is close to open headers will run the best, that means no H pipes, no tailpipes, and no muffs if it's legal. SteveW
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Dad Vishus
Gearhead Posts: 418
From: Moscow, Iowa, USA
Registered: Dec 2001
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posted 10-23-2002 09:07 AM
Saturday is Halloweird at Cordova. Have no clue what that means, but they are open. They also have Sat. Nov. 2nd listed as being open, weather permitting. I'm hoping for a nice day, like 65 degrees or better (fat chance). I'd like to make one more stab at it too.  If I get a chance, I may run up there Sat. If I do, I'll look you up, Zeater.
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'69Stang
Gearhead Posts: 125
From: Detroit, MI USA
Registered: Jan 2002
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posted 10-23-2002 09:17 AM
That's a big gain, more than what I would have thought.
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