[ta man]

Weather permitting I'm hoping this weekend to do some testing with no tailpipes...the next test after is a main body switch on my 950hp...switching to a 1050 mainbody with annular boosters.Hoping to do 1 or 2 track days a month for the rest of the year..

[grandville455]

11.20's? Y stop there!!! keep tuning that bad mutha lol

[ta man]

Originally Posted by grandville455

11.20's? Y stop there!!! keep tuning that bad mutha lol

What do you think it will run without the 2.5 inch tailpipes??I'm thinking a tenth and 1 mph...more is a bonus..depends on weather conditions...

[ta man]

Just checked the schedule...I'm going on Mopar day! Sounds like fun!

[grandville455]

Originally Posted by ta man

What do you think it will run without the 2.5 inch tailpipes??I'm thinking a tenth and 1 mph...more is a bonus..depends on weather conditions...

It may not pick up anything? lol... the tailpipes mandrel bent or no?

[b-man]

Originally Posted by grandville455

It may not pick up anything? lol... the tailpipes mandrel bent or no?

I would have to agree, might not pick up anything at the track.

I remember reading about Jim Hand testing 3" and 2-1/4" tailpipes on his wagon. Going from his usual 3" tails to some 2-1/4" tails barely slowed the car down. His wagon was making power pretty close to what you're making, he did get it to run in the 11.30s.

[ta man]

Originally Posted by grandville455

It may not pick up anything? lol... the tailpipes mandrel bent or no?

Yes they are mandrel bent 2.5 inch PYPES..weather is going to be warmer Saturday then last outing too..so I will have to factor in DA

[Half-Inch Stud]

Originally Posted by ta man

Yes.....mandrel bent 2.5 inch Pypes....

is what i gots. My Summary;

Headers and Collector designs will show Performance deltas.
mufflers also.
Tails at 2.5" mandrel-curved nearly moot and significantly quieting.


Low 11's and 3.08:1 is stunning. I'd be done & re-install the AC system.

[b-man]

The Torker II seems to get overlooked by most unfortunately.

I won a lot of bracket races with a low-compression 455 topped by a stock Torker II and 650 DP Holley. I was nice getting some contingency prizes from Edelbrock too when I was winning.

It's a damn fine intake, especially so if Derek hits in just the right places with his grinder.

Nice going guys, the train just keeps on rollin'.

[Pontiac Derek]

Sorry, i didnt see this!
Yeah luckily he is going faster than without the port work lol
I told him Good or Bad i want him to post the results!
Its valuable information and if it didn't work like i thought i would go back to the drawing board ya know!
Next up i want to do one my fully ported RPM intake, i want to get someone in the tens on pump gas with a car/engine like TAMAN's
Take Care!
Derek Stewart Racing engines

Originally Posted by b-man

The Torker II seems to get overlooked by most unfortunately.

I won a lot of bracket races with a low-compression 455 topped by a stock Torker II and 650 DP Holley. I was nice getting some contingency prizes from Edelbrock too when I was winning.

It's a damn fine intake, especially so if Derek hits in just the right places with his grinder.

Nice going guys, the train just keeps on rollin'.

[77 TRASHCAN]

Spank them mopars!

[NYGTO]

Enjoying this thread. Part of the reason for limited or no gain might be due to the exhaust gases being cooler when it reaches the tailpipes, requiring less volume than hot exhaust does (although this might pertain more to stock or mildly modified cars). My money is on you guys. Low 11's, 3:08's and great street ability, that's fantastic.

[wheneaglesfly]

Originally Posted by NYGTO

Enjoying this thread. Part of the reason for limited or no gain might be due to the exhaust gases being cooler when it reaches the tailpipes, requiring less volume than hot exhaust does (although this might pertain more to stock or mildly modified cars). My money is on you guys. Low 11's, 3:08's and great street ability, that's fantastic.

If a person had the ambition it would be interesting to see an entire dual exhaust system hand wrapped in Modern Turbo exhaust High Temp Fiberglass wrap.
Then drag strip test.
Just watch for MPH gains & losses.
Its really good stuff.
Started A Ford Single Turbo build 76 mm Turbonetics today.
Engine running the headers were easily 500-550 F under the fiberglass wrap.
I touched several header tubes & never got burnt.
Maybe 130- 140 F on outside of High temp thermal wrap.

[wheneaglesfly]

Not sure if I agree with current exhaust system sizing but everyone seems happy with 2-1/2 Duals.

Bigger is better usually I think but if not turning high rpms it explains why 2-1/2 works.

3-4-5 inch is old school, 3.00" fan here.

Semi trucks running around dual 8.00 " systems...

[Skip Fix]

So some real track time data on my 78 I posted in the exhaust section thread.

I had 3" H pipe 2 chamber 3" flowmasters and 2.5 mandrel tailpipes omn the car for legal NMCA classes when I ran the RAIV 400. Dropped in the first E head 455 with a 259/262 @ 0.050 solid roller. It would pick up 0.2-3 sec open headers over closed exhaust with mufflers and pipes still on the car. While swapping tranny and convertor noticed mufflers and tailpipes were rusty so pulled the whole system off. Took it to the track and did some tuning. Then add a 3" Dr. GasX and 3" Ultraflows into 3" Torque Tech mandrel tailpipes. Even with the additional weight of the system the car ran identical. 1/8 6.9s @ 99-100 1/4 10.90s @ 123 with that motor.

[wheneaglesfly]

Originally Posted by Skip Fix

So some real track time data on my 78 I posted in the exhaust section thread.

I had 3" H pipe 2 chamber 3" flowmasters and 2.5 mandrel tailpipes omn the car for legal NMCA classes when I ran the RAIV 400. Dropped in the first E head 455 with a 259/262 @ 0.050 solid roller. It would pick up 0.2-3 sec open headers over closed exhaust with mufflers and pipes still on the car. While swapping tranny and convertor noticed mufflers and tailpipes were rusty so pulled the whole system off. Took it to the track and did some tuning. Then add a 3" Dr. GasX and 3" Ultraflows into 3" Torque Tech mandrel tailpipes. Even with the additional weight of the system the car ran identical. 1/8 6.9s @ 99-100 1/4 10.90s @ 123 with that motor.

I believe you.

But I was not there.

Retune & Rejet often required.

[HWYSTR455]

Originally Posted by Skip Fix

So some real track time data on my 78 I posted in the exhaust section thread.

I had 3" H pipe 2 chamber 3" flowmasters and 2.5 mandrel tailpipes omn the car for legal NMCA classes when I ran the RAIV 400. Dropped in the first E head 455 with a 259/262 @ 0.050 solid roller. It would pick up 0.2-3 sec open headers over closed exhaust with mufflers and pipes still on the car. While swapping tranny and convertor noticed mufflers and tailpipes were rusty so pulled the whole system off. Took it to the track and did some tuning. Then add a 3" Dr. GasX and 3" Ultraflows into 3" Torque Tech mandrel tailpipes. Even with the additional weight of the system the car ran identical. 1/8 6.9s @ 99-100 1/4 10.90s @ 123 with that motor.

That's fairly real-world results. But I wonder if the X over the H was the determining factor? Or contributed the most to the difference I should say.

2016 Hellcat Charger with drag radials has done 10.7 in the 1/4 by some trade rags, with a few upgrades, it would be in the 9s. BUT, you toss a blower on a Pontiac, where do you think you would be? Or even just build an IA2 for the $40k+ you would save?

.

[wheneaglesfly]

Originally Posted by HWYSTR455

That's fairly real-world results. But I wonder if the X over the H was the determining factor? Or contributed the most to the difference I should say.

2016 Hellcat Charger with drag radials has done 10.7 in the 1/4 by some trade rags, with a few upgrades, it would be in the 9s. BUT, you toss a blower on a Pontiac, where do you think you would be? Or even just build an IA2 for the $40k+ you would save?

.

I am leaning towards Turbo.
Charge air temps can be an issue Using a Blower roots style.
Only mechanical part moving in the Turbo is the Exhaust Turbine & Cold side compressor turbine.

[ta man]

Originally Posted by HWYSTR455

That's fairly real-world results. But I wonder if the X over the H was the determining factor? Or contributed the most to the difference I should say.

2016 Hellcat Charger with drag radials has done 10.7 in the 1/4 by some trade rags, with a few upgrades, it would be in the 9s. BUT, you toss a blower on a Pontiac, where do you think you would be? Or even just build an IA2 for the $40k+ you would save?

.

That will be my next street engine..either a procharged engine,or a 500plus cube and run mid to low 10's and a full street car.I really want to see a Hellcat run..especially at the slippery track I run at..I don't mind getting beat...I eventually come back and beat every street car that beats me!

[HWYSTR455]

Originally Posted by ta man

That will be my next street engine..either a procharged engine,or a 500plus cube and run mid to low 10's and a full street car.I really want to see a Hellcat run..especially at the slippery track I run at..I don't mind getting beat...I eventually come back and beat every street car that beats me!

I was this [] close to finishing my procharger 455 build, XFI, sequential, and decided it would be easier to build a 535 or 555. Just recently sold the procharger, intercooler, ECU stuff, intake, throttle body, and injectors too. Just easier to do it NA.

Got a fresh, never had fluid, TKO600 RR, full kit from Keisler, McLeod blow proof, and a McLeod street twin, will sell all that too, going to a 4L80E. Funny how time changes things.

I have Torque Tech tail pipes on my 'bird, fit excellent, but they're 2.5s. At the time, the 70-73 exhaust tips were only available in 2 1/4, so I cut the ends at an angle like the OE tips, and had the whole tail pipes chromed. They look great still, but will probably go to 3" after hearing your results Skip.

I have a collector-back Pypes kit, still in the box, will probably sell that too...

.