Ported Engine!! What would be THE BEST exhuast?
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Ported Engine!! What would be THE BEST exhuast?
IM a Huge Fan of TRUE DUALS!! tru tru is just ( dont kill me santiago ) that reading a couple threads on the forum i found that true duals might not give me as much horsepower and torque as it is advertised to give, since my engine is lightly ported. everything else is stock on the engine 1988 GXL N/A. I just emailed mazdatrix i will post their answer. thanx guys
#2
Do a barrel roll!
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Id go for a collected if I were you. The scavenging effect you get from the collected exhaust will help move the gases out at a higher velocity, which will help out the top end of a ported rotary alot. This of course is just my opinion, Im sure others will have their own. Whether you choose a collected singe, or a collected dual is up to you. Id go dual, for the looks and sound. If ALL that you are concerned with is power, then go single.
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Between Kevin and I we have played with all the major “pre-made” exhausts on the market. In my honest opinion the true duals with the Racing Beat mufflers have shown the most gain up top. So much in fact that when you wire the 6th ports open you can really feel the lack or torque down low. I would suggest making arrangements to have your 6th ports operational if you use this exhaust.
A while back there were several threads floating around about using the true dual header and fabricating a collector pipe that would feed a 2.5”-3” pipe all the way back to single or dual muffler. I believe banzitoyota did one of those as well that he is in the process of testing right now. That I believe this would be the best way to go because you could tune to your specific wants/needs. But not everyone has the time, cash, or experience to R&D a custom exhaust system.
So out of the “pre-made” verity I vote true duals
- Dana
A while back there were several threads floating around about using the true dual header and fabricating a collector pipe that would feed a 2.5”-3” pipe all the way back to single or dual muffler. I believe banzitoyota did one of those as well that he is in the process of testing right now. That I believe this would be the best way to go because you could tune to your specific wants/needs. But not everyone has the time, cash, or experience to R&D a custom exhaust system.
So out of the “pre-made” verity I vote true duals
- Dana
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Originally posted by vegeta6263
what about the low end torque?
what about the low end torque?
- Dana
#6
Rotors still spinning
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You said that your engine is "lightly ported". True duals works best with stock or near stock porting. The key is that the intake doesn't open any earlier and the exhaust doesn't close any later. In other words not increasing the port overlap. If your engine is lightly ported my guess is that the overlap isn't increased or at least not an appreciable amount. A large streetport (or an extend port if you are an Aussie!) wouldn't like the dual as much but yours may do very well with it. I would be willing to bet that Mazdatrix tells you that the dual will be your best gain.
The "best" system would be the one that you design and dyno test and build yourself.
The "best" system would be the one that you design and dyno test and build yourself.
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here im attaching a picture. Everything on the engine ( long block) including the 5th and 6th port are working perfectly and even though i cant rev my engine more than 3000 rpms due to the recent rebuild i can feel the torque wanting to increase right when im in 2900 to 3000rpms. thanx everyone so is the porting job small enough to go tru duals and gain about 90% of those numbers ( 30 hp gains). or is it too big and i should go collective one muffler exhaust system. Im running premix by the way FLAMES!! wowow0
Last edited by vegeta6263; 09-12-03 at 11:10 AM.
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no unfortunatly i dont.
they were ported nicely all of them in my opinion.
the rotor housings were also ported well a lil. the diffusers where the exhaust holes are on the rotro hosuings were taken out and a lil porting was done. barely any though. so now i ahve no exhaust diffsers on my engine tru tru!!
they were ported nicely all of them in my opinion.
the rotor housings were also ported well a lil. the diffusers where the exhaust holes are on the rotro hosuings were taken out and a lil porting was done. barely any though. so now i ahve no exhaust diffsers on my engine tru tru!!
#12
Rotors still spinning
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If it is mostly no exhaust diffusers but no much enlargening then you should be OK for a true dual. I personally am partial to a long primary collected system though but that is just me. The duals work great on stock to mildy ported engines and your may respond well with either.
#15
Eat Rice Don't Drive it.
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Alex I am gonna kick your ****. lol!
j/p
Anyways if it is a small port the true duals will still offer the better overall power. I hope you cleaned your 5th and 6th while the engine was apart trust me it sucks when they are not working or wired. Your not going for all out HP I know this because you didn't do a major port job so you want something that will give you overall HP not just a peak like a collected(tuned) exhaust. MS and the rest forget to mention that they tuned exhaust usually makes less power out of its range than an uncollected does which limits your power to a specific situation instead of just boosting the entire range.
Anyways I still vote for the duals because MS looks like he has other reasons for bashing on the Duals and MT so I don't buy much of his talk.
Santiago
j/p
Anyways if it is a small port the true duals will still offer the better overall power. I hope you cleaned your 5th and 6th while the engine was apart trust me it sucks when they are not working or wired. Your not going for all out HP I know this because you didn't do a major port job so you want something that will give you overall HP not just a peak like a collected(tuned) exhaust. MS and the rest forget to mention that they tuned exhaust usually makes less power out of its range than an uncollected does which limits your power to a specific situation instead of just boosting the entire range.
Anyways I still vote for the duals because MS looks like he has other reasons for bashing on the Duals and MT so I don't buy much of his talk.
Santiago
#17
Eat Rice Don't Drive it.
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Generally the collected exhaust but not just a bolt on. You need to make your own specifically tunning it for the engine it is to go on. But this is just talking about peak HP and not overall power. Still no dyno sheet of a tuned exhaust. well I think Banzai had one but that thing is making crappy numbers. lol
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Hey guys, um my 5th and 6th ports are not working as whoever had the car before me put on a free flowing exhaust (some kind of headers and straight pipe to a single exhaust) they also took the air pump off. The little hook thing of the actuators moves fine when I move it. How do I wire my 5th and 6th ports open.
Thanks
Jon
Thanks
Jon
#20
Eat Rice Don't Drive it.
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Do not wire them open. You will only loose low end. Get them to work. You can use an air pump and some other stuff to make them operate at 3800 or 4k like they should. Wiring htem open should not even cross your mind! It sucks ***** with them wired open.I suggest you get a pre-silencer combo if you don't wanto get into the air pump deal. Not to mention single outlet looks
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Originally posted by zinx
Straight headers dumped on the side behind the right left wheel would be the best. It would be loud as **** but it would be the best.
Straight headers dumped on the side behind the right left wheel would be the best. It would be loud as **** but it would be the best.
No it isn't.
The length of the exhaust is way to short... Plus, if they are uncollected, the dynamic scavenging effect between the two is lost, huge power loss.
I've run my car with just headers too, just to make sure that my own theories and prevailing logic holds true, and it does- it's much slower. (When it was N/A BTW)