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#1
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Pussycat 505
I've got a 505 in my 65 GTO, 87 cc e-heads, dougs round ports, full Pypes exhaust with a 3" x pipe into 3", 20 inch long race pros, then tapers down to 2.5" tail pipes.
Right now I am just trying to make it a basic street car. When I idle the car in my shop at night, my wife says it can keep our 2 year old awake. My current plan is to get rid of the 3" Race Pros and switch to 2.5" Dynomax Super Turbos, use the Flowmaster reducer cone in front of the muffler, and see if that makes a difference. Am I on the right track, or just a waste of money? I want the car to be as quiet as possible at idle. |
#2
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also it idles about 1000 rpm on full manifold advance. was thinking about switching to ported to drop idle rpm and quiet it down more. does that sound reasonable and will it create oilng issue? i have the comp hydraulic roller lifters.
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#3
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I like the plan. I had a thought of putting more insulation in or hanging sound barriers up too. I think we need to hear a video of it to see what we are dealing with lol
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#4
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Quote:
Make another choice on mufflers. But overall you can not quite HP.
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Carburetor building & modification services Servicing the Pontiac community over 20 years Last edited by shaker455; 12-08-2019 at 04:49 PM. |
#5
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Is there a SCFM flow rating for the 3" Race Pros for comparision to what DynoMax rates their muffler at, if so take note.
In the past I used to run only DynoMax UtraFlo Welded mufflers but on the previous 462 combo I went to their Super Turbo muffler because it was going to be street only and the HP loss was was not a factor (it made 580 hp). The Super Turbos are noticeably quieter. But now On my current 505 at about 650 hp I did not want to 'choke' it down and went back to the UltraFlow welded with far more flow than the super Turbos. Current 505. 2-inch headers with full 3-inch exhaust including X-crossover and 3-inch tail pipes useing Ultra Flow Welded mufflers: https://www.youtube.com/watch?v=sY76...ature=youtu.be Sounds of DynoMaX http://www.dynomax.com/sounds-of-dynomax/ .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE Last edited by Steve C.; 12-08-2019 at 05:39 PM. |
#6
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not too worried about losing power. i do not race it and i am pretty sure it will still rip my face off even with an exhaust change! just trying to get more time with the car and one of my issues is not wanting to start it after the kids go to bed.
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#7
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It's hard to quiet big engines making 600 hp. The more you restrict the system with small pipes and mufflers you will lose power to the ground...maybe consider a "quiet system" but with cutouts.
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466 Mike Voycey shortblock, 310cfm SD KRE heads, SD "OF 2.0 cam", torker 2 373 gears 3200 Continental Convertor best et 10.679/127.5/1.533 60ft 308 gears best et 10.76/125.64/1.5471 |
#8
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#9
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my x pipe has them, never uncapped. that’s what i should have done, ran it uncapped at first. then after the wife said something, put the race pros on and she would have been so happy about how quiet it was 😂
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#10
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I'd insulate the kids room for noise before touching the car. But that's me lol
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#11
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Every time I've used the Race Pros I end up removing them. I've done that twice now on 2 different cars, so I don't waste anymore money there.
They have just been too loud everyplace for my taste. I end up with Dynomax these days pretty much like Steve has found. |
#12
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Remember when you go to hyd rollers from solid rollers you will gain about 8 degrees of duration.Your idle if like mine will get more aggressive.I find the super turbos a little more quiet at idles but louder at 2000 cruise.My Hushpowers were more quiet at 2000 but were a little louder at idle.This was with 2 1/2 all the way back over the axles.Tom
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#13
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I had a SBC with full 3 inch duals with X pipe and dyno max super turbos 3 inch in and out. It was very reasonably quiet. About 480hp engine
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GOD does business with people that mean business! |
#14
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Try putting a Dynomax bullet muffler in each tailpipe. It would be quieter and no power loss.
https://www.summitracing.com/parts/wlk-24215/
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68 GTO,3860# Stock Original 400/M-20 Muncie,3.55’s 13.86 @ 100 Old combo: 462 10.75 CR,,SD 330CFM Round Port E's,Old Faithful cam,Jim Hand Continental,3.42's. 1968 Pontiac GTO : 11.114 @ 120.130 MPH New combo: 517 MR-1,10.8 CR,SD 350CFM E's,QFT 950/Northwind,246/252 HR,9.5” 4000 stall,3.42's 636HP/654TQ 1.452 10.603 @ 125.09 http://www.dragtimes.com/Pontiac-GTO...lip-31594.html |
#15
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*You have 3" pipe from the headers to the mufflers now?
Does this car have an X-pipe? If so the I would go to a 2-1/2" Dynomax super turbo. As large a case as you can get. How big is the cam? |
#16
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I can tell what not to choose, 40 series flowmaster. Ungodly loud.
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#17
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you don’t have to worry about me running flowmasters!!!! |
#18
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old faithful 1.0 and 1.5 rockers. baby cam! |
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#20
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