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Author Topic:   turndowns
chips67
Gearhead

Posts: 546
From: louisville, ky, usa
Registered: Jul 2001

posted 04-02-2002 10:21 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
thinking seriously about hacking off the tailpipes for 3 inch turndowns behind the 2.5 inch flowmasters. i want like short mandrell bent 45's but i havent found them locally. if i was looking at the right ad, summit is rediculously high, $45. is it worth the trouble? current tail pipes are 2.5's but non mandrell bent over the rear axle. anybody see significant gains?

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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steve'66
Gearhead

Posts: 3677
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-02-2002 10:37 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Chip,

Just use cheapo 2 1/2" 45 degree pipes from your local cheapo auto parts store. They'll flow a lot better than your old tailpipes.

SteveW

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chips67
Gearhead

Posts: 546
From: louisville, ky, usa
Registered: Jul 2001

posted 04-02-2002 10:56 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
steve, the cheap ones always have that crinkle on the inside of the radious. maybe get the 3 inch cheapies and home-smooth the crinkles myself. hmmmm....

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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steve'66
Gearhead

Posts: 3677
From: Sonoma,CA,USA
Registered: Mar 2000

posted 04-02-2002 11:10 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
LOL Chip,

That's an idea! The 6" of crinkles can't have that much back pressure though, and the gases are cooler and less dense after the muffs too.


SteveW

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n2oMike
Gearhead

Posts: 727
From: Spencer, WV
Registered: Jan 2001

posted 04-02-2002 11:15 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
If you are running 2.5" pipe, you don't really need anything larger than 2.5" turndowns... of course 3" won't hurt anything.

If you don't like turndowns (they are kind of hard on the head at idle... and stir up a LOT of dust) those $99/pair Flowmaster 2.5" mandrel bent tailpipes shouldn't hold it back any.

As for the turndowns, try the catalog at your local muffler shop. They can order parts like that from their supplier. The price will be around $10. I purchased a few sets of 3" turndowns from a local supplier... but the latest ones that came in were not mandrel bent, so I didn't take them. The "large truck" section is where the 3", 3.5", and 4" stuff is found. If you look at these trucks and buses, you'll see the exhaust parts you need.

If you strike out there, the 'Warlock' turndowns through Summit seem to be the best priced 'catalog' units. You can also buy a 3" 'U' bend and cut it in half.

You definitely need to get rid of those kinked 'muffler shop' units.

Good Luck!

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Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

[This message has been edited by n2oMike (edited 04-02-2002).]

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chips67
Gearhead

Posts: 546
From: louisville, ky, usa
Registered: Jul 2001

posted 04-03-2002 12:36 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
the kinked pipes are good as gone. the bus pipes are a good idea! my sister drives a schoolbus (which means basically they hire anybody) and i drive a concrete mixer....thats 2 turndowns right there!im gonna see if the shop mechanics can hook me up. plus without the tailpipes i can unbolt the whole system if i wanna try straight headers one time. turndowns arent as loud as stright headers.....right guys? im hoping they arent too hard on my ears. will the added weight of extra stereo equipment needed negate the hp gained by the turndowns?

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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n2oMike
Gearhead

Posts: 727
From: Spencer, WV
Registered: Jan 2001

posted 04-03-2002 02:10 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Turndowns after the mufflers are not nearly as loud as open headers, but DO tend to vibrate the interior of the car and 'drone' quite a bit. They also stir up a LOT of dust.

I would run 3" exhaust back to a set of 3" mufflers... then weld collector rings to the muffler outlets. Then, weld rings to a set of 2.5" mandrel bent tailpipes AND a set of turndowns. This would allow you run tailpipes when hauling the family around... and when it came time to make some noise, you could unbolt the tailpipes and attach the turndowns.

You just weld header reducers to the tailpipes and weld the rings directly to the 3" turndowns.

Good Luck!

------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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chips67
Gearhead

Posts: 546
From: louisville, ky, usa
Registered: Jul 2001

posted 04-03-2002 09:43 PM     Click Here to See the Profile for chips67   Click Here to Email chips67     Edit/Delete Message   Reply w/Quote
mike, i like the way you think. now if i could just get these kids to quit eating a few days a week and not flush the toilet so much..... actually that is the best street/strip setup to have removable sections like that. 3 inch pipes on an n/a smallblock....or is that nitrous insurance in case you juice it later? wonder if i face the turndowns toward the tires if the exaust heat will aid the warming of the meats?

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67 coupe, 650dp and rpm intake on 5.0 with afr 165 heads, 4 speed, 4.11's.....best so far is [email protected] in 1/8 mile with 1.79 60ft. time.

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