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Author Topic:   New dyno figures with 3" exhaust
ZEATER
Journeyman

Posts: 70
From: Mount Pleasant,IA,USA
Registered: Aug 2001

posted 10-22-2002 05:51 PM     Click Here to See the Profile for ZEATER   Click Here to Email ZEATER     Edit/Delete Message   Reply w/Quote
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

posted 10-22-2002 05:52 PM     Click Here to See the Profile for Dad Vishus   Click Here to Email Dad Vishus     Edit/Delete Message   Reply w/Quote
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

posted 10-22-2002 06:22 PM     Click Here to See the Profile for ZEATER   Click Here to Email ZEATER     Edit/Delete Message   Reply w/Quote
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

posted 10-22-2002 06:43 PM     Click Here to See the Profile for Fastymz   Click Here to Email Fastymz     Edit/Delete Message   Reply w/Quote
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.

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ZEATER
Journeyman

Posts: 70
From: Mount Pleasant,IA,USA
Registered: Aug 2001

posted 10-22-2002 08:15 PM     Click Here to See the Profile for ZEATER   Click Here to Email ZEATER     Edit/Delete Message   Reply w/Quote
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

posted 10-22-2002 09:45 PM     Click Here to See the Profile for Ryan Wilke   Click Here to Email Ryan Wilke     Edit/Delete Message   Reply w/Quote
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

posted 10-23-2002 12:10 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
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

posted 10-23-2002 09:07 AM     Click Here to See the Profile for Dad Vishus   Click Here to Email Dad Vishus     Edit/Delete Message   Reply w/Quote
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

posted 10-23-2002 09:17 AM     Click Here to See the Profile for '69Stang   Click Here to Email '69Stang     Edit/Delete Message   Reply w/Quote
That's a big gain, more than what I would have thought.

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