223 RWHP DynoJet NA 4th gear
#26
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#28
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I do recall running 146 mph in the draft at Daytona pingin' on the rev limiter (which we set for 6th gear of 8,900 rpm. That was behind one of those damn orange Honda's. Those things are F A S T!
#29
Boosted Kiwi
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That type of design is similar to what Hymee used to good effect a few years back . Having a long length of pipe before the collector seems to be the key . Is that how you saw it Eric ?
Also - do you think the extra pipe on the ports closest to the collector makes any difference . IE if all the ports had identical exit radii like the furthest port would the gains be as good ?
Also - do you think the extra pipe on the ports closest to the collector makes any difference . IE if all the ports had identical exit radii like the furthest port would the gains be as good ?
Last edited by Brettus; 07-13-2009 at 04:57 PM.
#30
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Correct. The 5.12 is so spinny that you never use 1st. Its good for pulling out of the parking lot before you hit the rev limtr (joke). You only use second at a few tracks with very slow corners AND someone checks up in front of you. 3, 4, 5 and sometimes 6th.
#32
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Eric, you mentioned in another thread once that you were going to start getting your rotating assemblies futher balanced...did you find any good result in this? And if you don't mind, what ISO standard did you balance to, and did you continue to balance like Mazda at the flywheel/counterweights, or at the rotors instead?
Thanks, great information as always.
Thanks, great information as always.
The balancing was done by Mr. Daryl Drummond. Daryl has been around Mazda's since the 70's and was referred to me by Paul Yaw when we first started our Koni RX8 program in early 2008. Unfortunately Daryl was under contract with another team at the time and couldn't play ball with us. I have learned more from Daryl about rotaries and racing in the past few months then I've experienced in the past 12. I really think he is the best. Keep in mind that he does not market to or work with the street crowd much. Most of his stuff is Pro Mazda, RX7 PP and StreetP, 3 rotor jazz. Mostly all custom, no turbos and guys with a budget. He can actually tell you the hp loss you are likely to get after X thousand miles on several of his engines if you tune it the way he wants----crazy.
Daryl is the man and did/does our balancing work. His methods are proprietary and I'm not at liberty to discuss nor do I fully understand them. He is expensive and well worth it. Lots of rotary engine build knowledge gained over the past 30 years. I just spoke with him and he is writing up a bit of info that I can share with you at a later time.
#33
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#34
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Great Ceaser's Ghost! Did I say .98??? I thought I said .92. Lambda is another way of referring to Air Fuel ratio. For some reason Paul Yaw, Bosch, Motec and Daryl all take in terms of Lambda. Ask them what A/F and they will tell you they have no clue. .92 equates to about 13.5 A/F
13.0 is approx .88
13.1 ~ .89
13.2 ~ .9
13.3 ~ .905
13.4 ~ .91
13.5 ~ .92
13.6 ~ .925
13.7 ~ .93
13.8 ~ .94
13.9 ~ .945
14.0 ~ .95
All numbers approximate.
13.0 is approx .88
13.1 ~ .89
13.2 ~ .9
13.3 ~ .905
13.4 ~ .91
13.5 ~ .92
13.6 ~ .925
13.7 ~ .93
13.8 ~ .94
13.9 ~ .945
14.0 ~ .95
All numbers approximate.
#36
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That type of design is similar to what Hymee used to good effect a few years back . Having a long length of pipe before the collector seems to be the key . Is that how you saw it Eric ?
Also - do you think the extra pipe on the ports closest to the collector makes any difference . IE if all the ports had identical exit radii like the furthest port would the gains be as good ?
Also - do you think the extra pipe on the ports closest to the collector makes any difference . IE if all the ports had identical exit radii like the furthest port would the gains be as good ?
Extra pipe on the ports closest to the collector???????
I think you are asking about tight(er) radius on a few of the pipes---yes? If so, the designs we came up with HAD TO FIT INTO THE ENGINE BAY. THIS was the primary design constraint. Had we had a huge engine bay I'm sure we would've tried a bunch of crazy and expensive stuff. What is not pictured is the motormount which the headers intertwine with. Not the easiest thing for a 1st time to install. Also, I couldn't tell you what an stock airpump looks like if you hit me over the head with it. We remove this dude long ago and I don't recall if its stock location interferes with any of our designs we've tested.
#38
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Keep in mind that we run a very different exhaust that is costly and loud. I don't think our current setup is the hot ticket for everyone. It would require about 99% of the purchasers to go find a custom welder to either make the system work, build it, install it, make custom brackets, etc., etc., blah blah.
Now that I think about it I have a few questions for you guys on this forum:
1. What location on the car does the stock Cat Conv terminate?
2. Do you HAVE to run a Cat and what happens if you don't?
3. Can you run the car on a closed loop with just one 02 sensor located upstream (Team, I'm thinking this is right up your alley).
4. Let's pretend a header could be made (a) that installs easily, fits well, (b) allows you to plug in your 02 sensor/your car runs well without a bunch of headaches), (c) makes signfiicant power, (d) is at a reasonable price point, (e) not too loud and/or you could use your own muffler choices to control this somewhat------------where does the header and collector end and what does it attach to?
I have totally forgotten what a stock exhaust looks like.
Perhaps there is an interesting product out there that the market values. Dunno.
Team---call me
#39
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I'm just curious also if his header is the standard 3 runner, or a 4 runner. I had this question many times and noticed only a select few tuner companies in Japan running a 4 runner header. Now that about a year or so has passed since then... That company is now running this on their rx8 as a proto type for this years RE wars.
![](http://rx-race.cocolog-nifty.com/photos/uncategorized/2009/05/13/r09_b022.jpg)
Just wanted your thoughts on that Eric. Thanks for the great post and information.
![](http://rx-race.cocolog-nifty.com/photos/uncategorized/2009/05/13/r09_b022.jpg)
Just wanted your thoughts on that Eric. Thanks for the great post and information.
I'm not sure how this all mates together---two long exhaust pipes under the car and the longer exhaust/muffler at the rear of the car??
The only way to confirm it works well is to test it. I'm not qualified to comment on this.
#40
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Hey Eric. Great information as always with your typical attention to detail and using the scientific method.
2)You mention there are gains to be had with a properly designed header and collector. Am I reading it right that your header tube LENGTHs are 1 7/8" long (very short similar to OEM manifold style) and when you say VERY LONG collector are you saying just a continuous pipe before you get to the cat or resonator? I'm don't know what is considered the termination of the collector vs. mid-pipe. I am thinking if you are using a standard L to D ratio for fully developed flow of 8:1 and a 4" diameter pipe, you'd want ~32"?
Thanks again!
2)You mention there are gains to be had with a properly designed header and collector. Am I reading it right that your header tube LENGTHs are 1 7/8" long (very short similar to OEM manifold style) and when you say VERY LONG collector are you saying just a continuous pipe before you get to the cat or resonator? I'm don't know what is considered the termination of the collector vs. mid-pipe. I am thinking if you are using a standard L to D ratio for fully developed flow of 8:1 and a 4" diameter pipe, you'd want ~32"?
Thanks again!
Side note on this exhaust thing: Many of the designs were initailly built in Steel as it is easy to work with and cheap. We would test them and decide to build them in S.S. or move on to another design. We did this with the rest of the exhaust as well (from the collector to the back of the car). Our current new header design for the RX8 (un tested as of yet) is a side exhaust. More on that later.
Last edited by EricMeyer; 07-13-2009 at 06:39 PM.
#41
Power!!
Interesting concept. Never thought about it. What would the ideal solution/solutions look like?
Keep in mind that we run a very different exhaust that is costly and loud. I don't think our current setup is the hot ticket for everyone. It would require about 99% of the purchasers to go find a custom welder to either make the system work, build it, install it, make custom brackets, etc., etc., blah blah.
Now that I think about it I have a few questions for you guys on this forum:
1. What location on the car does the stock Cat Conv terminate?
2. Do you HAVE to run a Cat and what happens if you don't?
Keep in mind that we run a very different exhaust that is costly and loud. I don't think our current setup is the hot ticket for everyone. It would require about 99% of the purchasers to go find a custom welder to either make the system work, build it, install it, make custom brackets, etc., etc., blah blah.
Now that I think about it I have a few questions for you guys on this forum:
1. What location on the car does the stock Cat Conv terminate?
2. Do you HAVE to run a Cat and what happens if you don't?
#42
Power!!
Shaun---I apologize. I've mispoken. The header Diameter are not 1 7/8 on this particular motor and this dyno sheet. They are 2". The 1 7/8 was on an earlier test and not the ones in the photo. Rats! Darn it! 1,000 pardons. Sorry guys. My mistake. I totally make this stuff up as I go so it's hard to remember all these lies sometimes (KIDDING).
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
#43
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For these two questions the guys running AutoX in STX class this year have to run a cat. converter to be legal but they can move it further down the mid-pipe. I believe the Inlet for the cat. has to be within 6" of the stock Outlet. To me that means you can move the stock cat. down the length of the car. the length of the cat. plus 6". I think that's a good 18" to 24" further away from the exhaust manifold stock location. Team can correct me on that. I think there is also the school of thought that the mid-pipe is considered part of the Cat. which would allow us to put it wherever we want along the length of the midpipe.
Approx. how long is the stock cat assembly?
#44
悪魔のR
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Hey Eric. Thanks for the response on my post there
Just wanted your thoughts on the exhaust is all. Do you at least have any thoughts on the 4 runner header idea as opposed to the 3 that you guys use and most other people use as a header?
![Smilie](https://www.rx8club.com/images/smilies/smile.gif)
#45
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Great info.
I have an ECM question. Ive read before (sorry did not find the post(s) from Rotary God that for max power the stock ECM would have to be disgarded and something else used, Bosch 4.3 in you case.
Why is that? How does changing over to a Bosch ECM help with power? Does it allow the Lambda and/or timing to be tuned better?
I have an ECM question. Ive read before (sorry did not find the post(s) from Rotary God that for max power the stock ECM would have to be disgarded and something else used, Bosch 4.3 in you case.
Why is that? How does changing over to a Bosch ECM help with power? Does it allow the Lambda and/or timing to be tuned better?
#48
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Great Ceaser's Ghost! Did I say .98??? I thought I said .92. Lambda is another way of referring to Air Fuel ratio. For some reason Paul Yaw, Bosch, Motec and Daryl all take in terms of Lambda. Ask them what A/F and they will tell you they have no clue. .92 equates to about 13.5 A/F
13.0 is approx .88
13.1 ~ .89
13.2 ~ .9
13.3 ~ .905
13.4 ~ .91
13.5 ~ .92
13.6 ~ .925
13.7 ~ .93
13.8 ~ .94
13.9 ~ .945
14.0 ~ .95
All numbers approximate.
13.0 is approx .88
13.1 ~ .89
13.2 ~ .9
13.3 ~ .905
13.4 ~ .91
13.5 ~ .92
13.6 ~ .925
13.7 ~ .93
13.8 ~ .94
13.9 ~ .945
14.0 ~ .95
All numbers approximate.
-Chike
#49
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eric-- good to hear from you--hope we can cross paths again-- our guys will be at Rd ATlanta in Oct with the PCA............if you EVER want a ride. We are lucky to have you share knowledge with us.
?
Did you take the jet air nozzles out of the lower intake?
The balance work on the rotors was concentrated around the center part and not the faces--wasnt it?
Olddragger
?
Did you take the jet air nozzles out of the lower intake?
The balance work on the rotors was concentrated around the center part and not the faces--wasnt it?
Olddragger
#50
rot8ing
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Great Ceaser's Ghost! Did I say .98??? I thought I said .92. Lambda is another way of referring to Air Fuel ratio. For some reason Paul Yaw, Bosch, Motec and Daryl all take in terms of Lambda. Ask them what A/F and they will tell you they have no clue. .92 equates to about 13.5 A/F
13.0 is approx .88
13.1 ~ .89
13.2 ~ .9
13.3 ~ .905
13.4 ~ .91
13.5 ~ .92
13.6 ~ .925
13.7 ~ .93
13.8 ~ .94
13.9 ~ .945
14.0 ~ .95
All numbers approximate.
13.0 is approx .88
13.1 ~ .89
13.2 ~ .9
13.3 ~ .905
13.4 ~ .91
13.5 ~ .92
13.6 ~ .925
13.7 ~ .93
13.8 ~ .94
13.9 ~ .945
14.0 ~ .95
All numbers approximate.
I need to lean back out, i think.
what were the actual afrs on this pull?
great info, btw. thanks.
Last edited by myriadshalaks; 07-13-2009 at 11:08 PM.