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Author
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Topic: 3" exhaust.... HELP or HURT?????
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hidnn.o.s.
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Member # 1219
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posted
 
 
What do you guys think with this scenario?
92lx with a 331. Unported Edelbrock heads/intake, custom cam, s trim pushing 13 pounds of boost, long tubes with off road.
UNTUNED it pulls 521 to the wheels with full 2 1/2" exhaust.
NOTHING else is changed but the FULL exhaust is replaced with all mandrell bent 3" over the axle (w/griggs suspension in the rear)
Now what do you guys think? Increase, loss, or no change?
HOW MUCH do you think it would lose or gain?
(thought the topic may do better in this forum)
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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66 AC COBRA
Nitrous King
Member # 904
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posted
i would say it should help, how much i have no ideal
if this is ur new car ![[worship]](graemlins/worship.gif)
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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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rokcrln
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Member # 2536
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posted
Sounds sweet can you post some pics of the 3" over the rear axel with the grigs.
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71 Bronco stock (for now) w/59k miles.
73 Bronco EFI 351W
71 Chevy PU w/Vett LT1
Posts: 448 | From: Winters Ca. | Registered: Mar 2003
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Jeff S
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Member # 371
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posted
I'd guess the change if any will be + or - 5hp.
My car on the dyno gained 2hp from puling the h-pipe and runng 3" open collectors FWIW.
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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hidnn.o.s.
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Member # 1219
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posted
Jeff, lol, you got screwed.
I will let forced331 post the gain that he received ![[patriot]](graemlins/patriot.gif)
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
I dont think it will be worth that much hp....I especially dont think it would be worth the hassle of putting a 3" exhaust over the axle...Maybe if your car is not lowered..
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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forced331
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Member # 1270
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posted
It dynoed at 521rwhp untuned with 2.5in, and 3inch still untuned 557rwhp.
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1992 Ford Mustang LX (Original Owner)"Titanium Frost" 331stroker S-Trim, 5spd
2014 Ford Mustang GT- daily driver
Posts: 1154 | From: Sonoma County | Registered: May 2002
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hidnn.o.s.
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Member # 1219
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posted
quote:
Originally posted by Black94 5.0:
I dont think it will be worth that much hp....I especially dont think it would be worth the hassle of putting a 3" exhaust over the axle...Maybe if your car is not lowered..
LOL, the car IS lowered at that!!!!!!!!!! I think it was sure worth it!!!
I NEVER would have imagined that it would have increased that much just by the exhaust. The car litteraly went from the dyno at 521 to the rack and right back to the dyno and put up 557!!! Both times the car had been sitting for quite a while prior to the dyno pull in order to be cooled down.
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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66 AC COBRA
Nitrous King
Member # 904
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posted
36rwhp gain ![[Eek!]](eek.gif)
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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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racercosmo
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Member # 1864
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posted
Boost needs to get out of the engine at some point.
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Beauty is in the eye of the beer holder
Posts: 973 | From: Marin | Registered: Sep 2002
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racercosmo
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Member # 1864
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posted
And whose car is this?
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Beauty is in the eye of the beer holder
Posts: 973 | From: Marin | Registered: Sep 2002
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forced331
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Member # 1270
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posted
Its mine!
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1992 Ford Mustang LX (Original Owner)"Titanium Frost" 331stroker S-Trim, 5spd
2014 Ford Mustang GT- daily driver
Posts: 1154 | From: Sonoma County | Registered: May 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
quote:
Originally posted by hidnn.o.s.:
quote:
Originally posted by Black94 5.0:
I dont think it will be worth that much hp....I especially dont think it would be worth the hassle of putting a 3" exhaust over the axle...Maybe if your car is not lowered..
LOL, the car IS lowered at that!!!!!!!!!! I think it was sure worth it!!!
I NEVER would have imagined that it would have increased that much just by the exhaust. The car litteraly went from the dyno at 521 to the rack and right back to the dyno and put up 557!!! Both times the car had been sitting for quite a while prior to the dyno pull in order to be cooled down.
WOW, I guess the 2.5" was really restrictive..I thought the Edelbrock heads would have "bottlenecked" the combo more than the exhasut..I stand corrected...
Did you change the style mufflers?...
What "bump stop" do you have on the axle?...I've seen stock pipes rub on a 1.5" lowered car!!...
Hey, if you got 3" over the axle exhaust in there without interference more power to ya!!!
[ May 01, 2003, 10:20 PM: Message edited by: Black94 5.0 ]
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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forced331
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Member # 1270
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posted
Its stock bump stops, The exhaust was custom fabricated over the axels and there is nothing rubbing and they also had to clear around the griggs torque arm and panhard brace. I don't know how they did it, but Im impressed that it clears everything and got me some more ponies.
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1992 Ford Mustang LX (Original Owner)"Titanium Frost" 331stroker S-Trim, 5spd
2014 Ford Mustang GT- daily driver
Posts: 1154 | From: Sonoma County | Registered: May 2002
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forced331
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Member # 1270
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posted
I had 3 chamber delta flows, now i think they put
2 chambers or there the series flowmasters, there 5 inches thick and only 10 inches wide.
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1992 Ford Mustang LX (Original Owner)"Titanium Frost" 331stroker S-Trim, 5spd
2014 Ford Mustang GT- daily driver
Posts: 1154 | From: Sonoma County | Registered: May 2002
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WANARNM
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Member # 587
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posted
PICTURES!!PICTURES!!PICTURES!!PICTURES!!PICTURES!!PICTURES!!PICTURES!!PICTURES!!
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89’ Hatch. Completely stock.
Posts: 1390 | From: San Jose | Registered: Nov 2001
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forced331
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Member # 1270
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posted
I dont have any yet, i just picked up my car today. I will try to get some as soon as I can.
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1992 Ford Mustang LX (Original Owner)"Titanium Frost" 331stroker S-Trim, 5spd
2014 Ford Mustang GT- daily driver
Posts: 1154 | From: Sonoma County | Registered: May 2002
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
By the way, I'm assuming that the exhaust was fabricated using 3", "mandrel bends"?!.....
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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forced331
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Member # 1270
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posted
Of course! All bends were mandrel bends.
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1992 Ford Mustang LX (Original Owner)"Titanium Frost" 331stroker S-Trim, 5spd
2014 Ford Mustang GT- daily driver
Posts: 1154 | From: Sonoma County | Registered: May 2002
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racercosmo
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Member # 1864
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posted
I knew it probably wasn't Don's judging from the last time I saw it.
Where did you have the exhaust done, and where did you dyno it?
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Beauty is in the eye of the beer holder
Posts: 973 | From: Marin | Registered: Sep 2002
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Jeff S
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Member # 371
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posted
quote:
Originally posted by hidnn.o.s.:
Jeff, lol, you got screwed.
I will let forced331 post the gain that he received
Or... maybe my exhaust system is good. ![[Razz]](tongue.gif) He must have had some shitty Flowmasters on there or something.
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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Jeff S
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Member # 371
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posted
quote:
Originally posted by forced331:
It dynoed at 521rwhp untuned with 2.5in, and 3inch still untuned 557rwhp.
What is your timing set at? What octane gas? While on the dyno was there a A/F meter hooked up and if so what was the A/F ratio.
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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Primer GR40
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Member # 476
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posted
you gotta let me know who did the exhaust work, I need to get some pipes bent to clear my TA and PHB. If you coluld PM me the place and about how much it costs. Sick numbers by the way, should be fun once it gets tuned. ![[burnout]](graemlins/burnout.gif)
[ May 02, 2003, 02:21 AM: Message edited by: Blown Mystic ]
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Superdupercharged Cobra
No Transmatic Notch
Posts: 2108 | Registered: Sep 2001
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hidnn.o.s.
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Member # 1219
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posted
quote:
Originally posted by racercosmo:
I knew it probably wasn't Don's judging from the last time I saw it.
Where did you have the exhaust done, and where did you dyno it?
![[Roll Eyes]](rolleyes.gif)
I figured that it was pretty clear when I said that I would let forced331 post HIS results.
No info on the exhaust, sorry. It was all custom for Tony's perticular car.
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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hidnn.o.s.
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Member # 1219
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posted
quote:
Originally posted by Jeff S:
quote:
Originally posted by hidnn.o.s.:
Jeff, lol, you got screwed.
I will let forced331 post the gain that he received
Or... maybe my exhaust system is good. He must have had some shitty Flowmasters on there or something.
Jeff, he had an off road x pipe out of the mag for his long tubes and a dyno max cat back with 3 chamber flows. He had the flow cat back on there but when Griggs did the work they told him that he would have to put the dyno max pipes on it to clear the suspension.
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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