Racing beat road race header
#1
I Post In The Nude
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Racing beat road race header
So Im putting on my racing beat road race header and I think to myself.......... Self, what would this bad *** header sound like if you just ran your car open header. Well, after running it open header I found that 1. It gurgles like a mother ******, definately a rotary engine, 2. Its louder than a mother ******, reminds me of the dragsters I see running at the tracks. Now for the reason I actually made this post, do you think from the header I should run true dual or have the pipes collect into one and use the Y pipe that come with my N1's?
#3
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I am leaning towards the true duals as well. The only reason I wasnt sure is because of the noise factor, but when talking to a friend he pointed out something pretty obvious that I didnt even think of......silencers for the N1's. Heh so Im probably going with the true dual.
#5
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yeah that i know, but i would only use them if im going on a long trip or into a town where the cops are ********, like lets say in rowlett
#7
true duals is a dumb idea. it will sound like **** because the exhaust pulses will go from left muffler to right. (sounds retarted) also, rotarys like a little bit of back pressure, and true duals don't do ****. Run you "fake" dual system and i guarantee you will be very happy. Even racing beat or rotary performance would agree.
Enjoy your new exhaust!!
- Curt
Enjoy your new exhaust!!
- Curt
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#8
#9
Do a barrel roll!
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Originally posted by Curtass
true duals is a dumb idea. it will sound like **** because the exhaust pulses will go from left muffler to right. (sounds retarted) also, rotarys like a little bit of back pressure, and true duals don't do ****. Run you "fake" dual system and i guarantee you will be very happy. Even racing beat or rotary performance would agree.
Enjoy your new exhaust!!
- Curt
true duals is a dumb idea. it will sound like **** because the exhaust pulses will go from left muffler to right. (sounds retarted) also, rotarys like a little bit of back pressure, and true duals don't do ****. Run you "fake" dual system and i guarantee you will be very happy. Even racing beat or rotary performance would agree.
Enjoy your new exhaust!!
- Curt
*edit*- I see that he has a S5 N/A, so he doesnt have to worry about backpressure since the ports are opened by the airpump.
Last edited by Rxmfn7; 11-10-02 at 09:26 AM.
#11
Do a barrel roll!
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Originally posted by banzaitoyota
So, why are all the IT racers running singles?
Just food for thought.
Remeber they tune for max power in a given RPM range!
So, why are all the IT racers running singles?
Just food for thought.
Remeber they tune for max power in a given RPM range!
#12
Senior Member
Originally posted by HeavyFoot86
yeah, but those silencers kill the horsepower you gained by going true dual. Just a thought.
yeah, but those silencers kill the horsepower you gained by going true dual. Just a thought.
Do you even own an Apex exhaust? They do nothing to drain HP but just as they do almost nothing to quiet the sound. They WILL NOT drop your HP enough to offset the dual system.
My '86 has a RR header that collects into a single pipe just before entering the Apex N1 (single, passenger side outlet). No extra mufflers or pre-silencers. With the ported engine it is a nice soft rumble at idle and very loud at WOT. I cannot tell a difference in HP or noise with the silencer in or out while driving. The exhaust note changes with it at idle but that is about it.
#13
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Originally posted by Curtass
true duals is a dumb idea. it will sound like **** because the exhaust pulses will go from left muffler to right. (sounds retarted)
true duals is a dumb idea. it will sound like **** because the exhaust pulses will go from left muffler to right. (sounds retarted)
also, rotarys like a little bit of back pressure, and true duals don't do ****.
Run you "fake" dual system and i guarantee you will be very happy. Even racing beat or rotary performance would agree.
- Curt [/B][/QUOTE]
Well, I think he'll be happy either way - but a true dual system sounds neater and is more unique. Oh, and Racing Beat or RP wouldn't agree without a lot more info - like budget, desired powerband, application, etc.
Brandon
#14
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Originally posted by banzaitoyota
So, why are all the IT racers running singles?
Just food for thought.
Remeber they tune for max power in a given RPM range!
So, why are all the IT racers running singles?
Just food for thought.
Remeber they tune for max power in a given RPM range!
Just FYI, the turbo exhaust theory is a little different. The higher the pressure differential across the turbine, the more efficiently a turbo operates. Thus, the "best" TII exhaust is one that is very short, and very large diameter - you can't rely on scavenging nearly as much, since the turbo smoothes out the exhaust pulses.
Brandon
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Originally posted by ThePartsTrader
Do you even own an Apex exhaust? They do nothing to drain HP but just as they do almost nothing to quiet the sound. They WILL NOT drop your HP enough to offset the dual system.
Do you even own an Apex exhaust? They do nothing to drain HP but just as they do almost nothing to quiet the sound. They WILL NOT drop your HP enough to offset the dual system.
Brandon
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Originally posted by No7Yet
No engine "like[s] ... back pressure". They like exhaust gas flow velocity, which, in a badly tuned system on an N/A car, is often mistaken for backpressure. The key to a good exhaust is to maximise gas velocity while minimizing backpressure.
No engine "like[s] ... back pressure". They like exhaust gas flow velocity, which, in a badly tuned system on an N/A car, is often mistaken for backpressure. The key to a good exhaust is to maximise gas velocity while minimizing backpressure.
backpressure = bad.... always....
almost like driving w/ the AC on, in my experience.
Good thing mine's coming off...
#18
Senior Member
Originally posted by No7Yet
That's interesting - I've seen dyno charts from the Pensacola guys (Jay's car - drftkng on the forum, but he's not on much) that shows a 75 hp drop with the silencer in. This is while making about 250 rwhp on the stock turbo. Things might be different in N/A land, but afaik there's a very very definite hp drop - almost like driving w/ the AC on, in my experience.
That's interesting - I've seen dyno charts from the Pensacola guys (Jay's car - drftkng on the forum, but he's not on much) that shows a 75 hp drop with the silencer in. This is while making about 250 rwhp on the stock turbo. Things might be different in N/A land, but afaik there's a very very definite hp drop - almost like driving w/ the AC on, in my experience.
#22
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Ive decided to go with true dual, Im just waiting for my flange to get here so I can take it to Don Marvel to have him make me the custom pipes. Thanks for everyones suggestiongs but I was pretty set on true duals from the start. Oh and to the guy that said "fake" true duals, how do you figure that it is fake? Each rotor housing has its own pipe and muffler for exhaust to exit out of, thus making it a true dual system.
#23
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I have had both systems so here is my PERSONAL take on both. If you disagree with me is cool We each have different tastes. On my '88 I had a short primary collected system that split back apart through two Brullen mufflers, no cats. The collector pipe was 2 1/2" and the primaries are the standard 2". Car sounded awesome. Alot like an F-1 car. I loved it but really loud. I then changed to the true dual system still utilizing my Brullen mufflers and no presilencers. Car gained alot of lowend and a decent amount of midrange power as well. Top end power suffered though. For street use the dual was better. Daily driving was easier and gas mileage went up by an impressive margin. It was really loud though. Louder than the collected but this is to be expected. The downside is that it sounded absolutely horrible. I hated it. Tone was all wrong and no longer sounded like a rotary (or any other engine for that matter). The collected system was faster on the top end. Power on a collected system gets even better if you collect it to a 2.5" pipe and then gradually expand it to a 3" pipe. Great power here and my personal favorite. I really love the sound of a collected system. My GSL-SE has such a set up except it is a long primary system.
Decide what you want to do with the car. If it is a racer I say go collected. If it is a daily driver then dual may be the thing for you.
Decide what you want to do with the car. If it is a racer I say go collected. If it is a daily driver then dual may be the thing for you.
#24
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Thanks man. Im starting to get sorta worried about the tone of the true dual. Im going to be driving it around town a lot and its my daily driver.