Brettus NA power project
#51
How much of an impact do you think removing the rest of the catalyst had on the results?
Would be interesting to see what a manifold with separate runners of the same size you're using now routed into a merge collector would produce...something like Team's latest design. I suspect that some portion (perhaps small) of the flow from the back 2 runners tries to initially go forward when it first enters the log. If that does happen, I would expect a merge collected manifold would eliminate that problem.
Would be interesting to see what a manifold with separate runners of the same size you're using now routed into a merge collector would produce...something like Team's latest design. I suspect that some portion (perhaps small) of the flow from the back 2 runners tries to initially go forward when it first enters the log. If that does happen, I would expect a merge collected manifold would eliminate that problem.
#53
What's your feeling about the cat chamber ? I had the thought that it might be a good thing as it would dampen pulses before they enter the smaller tubing but not so sure now.
#54
No respecter of malarkey
iTrader: (25)
It’s all about the transitions. Without a long angle transition on the inlet it’s probably better to replace it with straight pipe. However, is this an OE cat pipe? You really need 3” all the way from the manifold to the tailpipe or have it split into dual 2.25” or 2.5” at the rear to get a free flowing exhaust.
The following users liked this post:
sharingan 19 (05-21-2021)
#55
It’s all about the transitions. Without a long angle transition on the inlet it’s probably better to replace it with straight pipe. However, is this an OE cat pipe? You really need 3” all the way from the manifold to the tailpipe or have it split into dual 2.25” or 2.5” at the rear to get a free flowing exhaust.
Last edited by Brettus; 11-22-2019 at 09:14 AM.
The following users liked this post:
sharingan 19 (05-21-2021)
#57
No respecter of malarkey
iTrader: (25)
It’s all about the transitions. Without a long angle transition on the inlet it’s probably better to replace it with straight pipe. However, is this an OE cat pipe? You really need 3” all the way from the manifold to the tailpipe or have it split into dual 2.25” or 2.5” at the rear to get a free flowing exhaust.
The following users liked this post:
Brettus (11-21-2019)
#58
REW Club
Glad you’re doing this for all of us novices’ out here in real time. I don’t like reading threads from 5-10 years ago when a lot has been discovered since then.
I can follow your lead if you make some real new discoveries before slapping a turbo kit and blowing up my first engine. Saving us money and time.
glad I have my Camry for the daily so I can really start my own tinkering on the 8 when done with school.
Thanks for doing this, information is priceless
I can follow your lead if you make some real new discoveries before slapping a turbo kit and blowing up my first engine. Saving us money and time.
glad I have my Camry for the daily so I can really start my own tinkering on the 8 when done with school.
Thanks for doing this, information is priceless
Last edited by 40th8Jake; 11-26-2019 at 01:37 PM.
#59
Cheers for that .
Next step : taking it in to get the cat cut out and a 'stock' resonator put in it's place. This should help deepen the tone and get rid of the hollow sound it has (coming from hollowed out cat we think).
Also : In talking to the muffler guy ..... he suggested that having the exhaust gradually reduce in size slightly over it's length is not necessarily a bad thing . Theory is : as the gasses cool they require less area to maintain the same velocity and therefore backpressure is no worse than the larger pipe.
So will be sticking with the system I have vs spending 2k on a 3" system that I suspect will show minimal gains over the 65mm system I already have.
Taking engine components in to be assembled this morning.
Next step : taking it in to get the cat cut out and a 'stock' resonator put in it's place. This should help deepen the tone and get rid of the hollow sound it has (coming from hollowed out cat we think).
Also : In talking to the muffler guy ..... he suggested that having the exhaust gradually reduce in size slightly over it's length is not necessarily a bad thing . Theory is : as the gasses cool they require less area to maintain the same velocity and therefore backpressure is no worse than the larger pipe.
So will be sticking with the system I have vs spending 2k on a 3" system that I suspect will show minimal gains over the 65mm system I already have.
Taking engine components in to be assembled this morning.
Last edited by Brettus; 11-26-2019 at 03:13 PM.
#62
I'm not sure what the deal is with the DSC .... today it turns on and off like normal . Yesterday the squiggly line and abs lights were on but pushing the DSC button was doing nothing. This might actually be normal when dynoing an 8 with DSC and I've just never been the one to hit the button before ....
.
.
#63
Ultra Noob
iTrader: (1)
Edit: to clarify, whole procedure is
- turn on/start car
- lock to lock
- turn off.
Upon restart it should be good to be re-toggled, or fully disabled by doing the 7 second hold. Once the hold is done, I don't think you can turn it back on without restarting the car. At least I haven't found a way.
Last edited by bwilk; 12-04-2019 at 03:50 PM. Reason: clarification
The following users liked this post:
Brettus (12-03-2019)
#67
Heh
Well , the new engine will be ready before xmas but I wont be fitting it till late January . In the meantime I'm doing cosmetic stuff to it in readiness for use as a wedding car ....So yeah ...big yawn for now.
Well , the new engine will be ready before xmas but I wont be fitting it till late January . In the meantime I'm doing cosmetic stuff to it in readiness for use as a wedding car ....So yeah ...big yawn for now.
Last edited by Brettus; 12-05-2019 at 01:28 PM.
#68
Registered
Do Aussies drag tin cans behind their wedding cars? Or just straight-pipe their rotaries?
The following users liked this post:
0-TO-100_Real_Quick (12-05-2019)
#73
REW Club
Cheers for that .
Next step : taking it in to get the cat cut out and a 'stock' resonator put in it's place. This should help deepen the tone and get rid of the hollow sound it has (coming from hollowed out cat we think).
Also : In talking to the muffler guy ..... he suggested that having the exhaust gradually reduce in size slightly over it's length is not necessarily a bad thing . Theory is : as the gasses cool they require less area to maintain the same velocity and therefore backpressure is no worse than the larger pipe.
So will be sticking with the system I have vs spending 2k on a 3" system that I suspect will show minimal gains over the 65mm system I already have.
Taking engine components in to be assembled this morning.
Next step : taking it in to get the cat cut out and a 'stock' resonator put in it's place. This should help deepen the tone and get rid of the hollow sound it has (coming from hollowed out cat we think).
Also : In talking to the muffler guy ..... he suggested that having the exhaust gradually reduce in size slightly over it's length is not necessarily a bad thing . Theory is : as the gasses cool they require less area to maintain the same velocity and therefore backpressure is no worse than the larger pipe.
So will be sticking with the system I have vs spending 2k on a 3" system that I suspect will show minimal gains over the 65mm system I already have.
Taking engine components in to be assembled this morning.
Heat excites molecules needing more volume i believe so it works out.
M=V/D and if you get scientific and measure the temp of the exhaust gas at header, then at tailpipe , you can calculate it...but a dyno will do all that without the maths.
Last edited by 40th8Jake; 12-07-2019 at 03:55 PM.
#74
Yep ....despite what Team says ..... I just don't think i'll gain anything much over a system that is free flowing anyway. Not to mention it made great hp already!
Anyone want some flame shots ... Team ? lol
Anyone want some flame shots ... Team ? lol
Last edited by Brettus; 12-07-2019 at 04:46 PM.
#75
No respecter of malarkey
iTrader: (25)
Well of course he *thinks* that, just like everyone else based on theory they know and love, but doesn’t apply here.
we could rehash the same old stuff again like Formula Pro Mazda/Renesis race cars having a short primary into a short, open 3” muffler and pipe
rather than all that bundle of snakes stuff they know so well and could easily build as well as lighter smaller diameter piping, muffler, etc., but why bother when people will just keep ignoring the obvious and insisting otherwise.
like I posted earlier, best output across the entire powerband would be the primaries dumping into the megaphone dumping as short as possible. Maybe even just short, open primaries. Because without exhaust pulse tuning the least amount of exhaust restriction always wins when combined with intake resonance tuning. It’s just common sense once you learn to let go of everything you knew before and see it for what it is than what you incorrectly imagine it to be.
.
we could rehash the same old stuff again like Formula Pro Mazda/Renesis race cars having a short primary into a short, open 3” muffler and pipe
rather than all that bundle of snakes stuff they know so well and could easily build as well as lighter smaller diameter piping, muffler, etc., but why bother when people will just keep ignoring the obvious and insisting otherwise.
like I posted earlier, best output across the entire powerband would be the primaries dumping into the megaphone dumping as short as possible. Maybe even just short, open primaries. Because without exhaust pulse tuning the least amount of exhaust restriction always wins when combined with intake resonance tuning. It’s just common sense once you learn to let go of everything you knew before and see it for what it is than what you incorrectly imagine it to be.
.
Last edited by TeamRX8; 12-07-2019 at 05:52 PM.
The following 2 users liked this post by TeamRX8:
Federighi (12-09-2019),
sharingan 19 (05-21-2021)