[quote name='smitty' date='Jul 16 2005, 07:58 PM']Kahren just looked at your dyno sheet nice job. Do you mind sharing runner dia. and length. I can't argue with the results, but did you do the math the runners seem short.Is there a reason you didn't use a plenum ? After seeing your numbers I'm making an intake. For basics on intake construction check this out http://www.turbonation.com/intake.htm

Thanks

Dave


[/quote]



i used math but i didnt folow it, the intake i ended up making was close to the origial math. to have the manifold straight on the engine the runners i used is the most you could go without changing the angle at which the air travels inside the engine thru the intake manifold. the runner length i use is not very good but i wanted to give it a shot anyway and see what the results would be. at first it seemed liek a good idea, but after running this manifold for some time i dont want to stick to the orignal design anymore. first of all i dont feel that the runners are logn enouf and second of all i dont want to construct an airbox on the pass side of the engine bay anymore. so i am chaning the design that will curve over the engine and i have a couple more lengths to try to get the ideal powerband. the new manifold is in process of being made. this is somethign i have been workign on for a little while now, as i think many people will find this an affordable mod for the NA that will make some nice gains over the stock intake manifold. i can not disclose the runner length at this time

 

Kahren if your planning on selling your intake after testing I'll stop asking questions and good luck. I keep searching and I don't think there is one out there.

thanks for all the help. Those are impressive numbers for an intake that breaks all the rules.

Dave

 

some useful info since i last posted, thanks guys.



i'm still not convinced on going street/extended port just because it is simpler/cheaper, heh



now i'm still wondering about the intake manifold. is the whole reason of getting a custom intake manifold allowing the ports to have individual runners? is this a bigger factor than the actual runner length?



also, i'm interested in the setup some people have with individual throttle bodies.

i'm wondering if ITBs can used to allow only one set of runners to be open under a certain RPM, helping the low end and idle characterisitcs. not too sure, more info would be great.



- Aaron

 

[quote name='coldfire' date='Jul 13 2005, 02:05 PM']originally posted here:

http://www.rx7club.com/showthread.php?t=442934



this discussion is about the 6-port non-turbo route, using a S5 13b.

my PRIMARY goal for this project will be to get a solid 200 whp



i don't see any way of getting this number without porting, which brings me to a major issue.

i had originally thought that an aggressive street port could yield this output. and yes, i have HEARD of people getting these numbers, and there are some that will argue it's possible. however now i personally don't think a streetport will cut it. so this is the main thing i'm trying to figure out.

so that leaves bridgeport i guess, but this opens up a whole can of worms, lol.

i'm still learning a lot, and have been playing around with a lot of ideas. one method that interests me is doing an agressive steetport on the primary and secondary ports, and then doing a bridge on the auxilary ports (is this what some people call a 1/3 bridge?). i'm not quite sure though if there's anyway to to retain the stock aux port system so that they still remain closed under a certain rpm? this would certainly help with the idle and also maintain the a good low end powerband.

what about those Euro-spec 6-ports? i heard they don't use sleeves...hmmm...



i have also been playing with the idea of using RX-8 or beveled rotors to get slightly more intake opening. maybe this would help get 200whp just on a streetport?





thanks

- Aaron


[/quote]



I had the same goal.



I'm close to doing it now, not as close as Kharen, but I hope to do it by the end of August. With a stock computer I've made 183 whp. I'll soon be installing a Microtech. I'm also using a stock S5 intake manifold.



Buzz

 

[quote name='Buzz' date='Jul 18 2005, 12:41 PM']I had the same goal.



I'm close to doing it now, not as close as Kharen, but I hope to do it by the end of August. With a stock computer I've made 183 whp. I'll soon be installing a Microtech. I'm also using a stock S5 intake manifold.



Buzz


[/quote]





you are running an extended (street) port then? that is some good power out of the stock ECU.

just wondering what you guys are running to get the good power out of this kind of port, are you using any particular templates?



i don't know if kharen has released that sort of information or not



- Aaron

 

I don't know that it is called an extended street port. My motor was first ported at a shop and during the last rebuild, I bought a Mazdatrix template and matched it up to that one. Since my car has to be emissions tested the porting had to be reasonable/drivable. I'm fairly certain that I'll make it to 200. I'll have a lot to play with fuel and timing.



If you have to pass emissions don't forget about that in your port work.



Buzz

 

[quote name='Buzz' date='Jul 18 2005, 03:29 PM']I don't know that it is called an extended street port. My motor was first ported at a shop and during the last rebuild, I bought a Mazdatrix template and matched it up to that one. Since my car has to be emissions tested the porting had to be reasonable/drivable. I'm fairly certain that I'll make it to 200. I'll have a lot to play with fuel and timing.



If you have to pass emissions don't forget about that in your port work.



Buzz


[/quote]





no i was saying extended/street port, as in either or.



yeah, emissions is kind of a non-issue. i was kind of hinting at the possible advantage of the 1/3 bridge for emissions, but it's not anything that is seriously important to me, since i am assuming whatever way i go it's going to be hard to pass emissions without some form of "bypass".



so you just used the Mazdatrix template? you didn't modify it in anyway?

well 180+whp is quite impressive then, even more so if you can get 200whp.



what are all your other mods?



- Aaron

 

[quote name='coldfire' date='Jul 19 2005, 05:10 AM']yeah, emissions is kind of a non-issue. i was kind of hinting at the possible advantage of the 1/3 bridge for emissions, but it's not anything that is seriously important to me, since i am assuming whatever way i go it's going to be hard to pass emissions without some form of "bypass".



so you just used the Mazdatrix template? you didn't modify it in anyway?

well 180+whp is quite impressive then, even more so if you can get 200whp.



what are all your other mods?



- Aaron


[/quote]



Could you please explain what you mean by "bypass" to pass emissions?



When I put the Mazdatrix template up to the ports that had already been done, it appeared that more porting could be done. Unfortunately I didn't take any photos. I didn't modify the template in anyway. Also, I should point out that I didn't buy Mazdatrix's exhaust templates. My exhaust ports were ported by the original engine builder but I never compared them to anything else. They were regular NA housings which means the builder had to grind/cut out the diffusers.



Aside from the porting I have: an S5 intake with a K&N cone, RB full race exhaust, 550 secondary injectors, an electric fan, no ps or ac, and an Unorthdox Racing pulley.

 

[quote name='Buzz' date='Jul 20 2005, 02:43 PM']Could you please explain what you mean by "bypass" to pass emissions?



When I put the Mazdatrix template up to the ports that had already been done, it appeared that more porting could be done. Unfortunately I didn't take any photos. I didn't modify the template in anyway. Also, I should point out that I didn't buy Mazdatrix's exhaust templates. My exhaust ports were ported by the original engine builder but I never compared them to anything else. They were regular NA housings which means the builder had to grind/cut out the diffusers.



Aside from the porting I have: an S5 intake with a K&N cone, RB full race exhaust, 550 secondary injectors, an electric fan, no ps or ac, and an Unorthdox Racing pulley.


[/quote]



bypass? heh, well you know...the less than legal methods of passing an emissions test

these include using some form of alcohol fuel, hooking the air pump to go directly into the exhaust stream, leaning out your fuel mix just for the test, etc.

there's actually quite a lot of threads about it on rx7club.com



anyways, it looks like you are getting the most gains from your exhaust and your port job, which is quite impressive. do you have any dyno graphs yet? i'd be interested to see your torque curve.

 

[quote name='coldfire' date='Jul 13 2005, 02:05 PM']

this discussion is about the 6-port non-turbo route, using a S5 13b.

my PRIMARY goal for this project will be to get a solid 200 whp



..i'm interested to hear how others would go about getting the stated power goal from a 6-port.



thanks

- Aaron


[/quote]





Just my thoughts and only mine.........A good quality(not big) street port on both the intake and exhaust ports and the proper intake/exhaust combination will get you what you want. The standard issue Racing Beat upper intake with a sidedraft carb or throttle bodies on the intake side. The header is a toss up as I haven't done any testing. For convenience the RB collected header/presilencer combo is hard to beat. But if you must have the ultimate you'll have to do some testing. True dual, short primary or long primary? Might get to that later. Tuning is ofcourse very important. Not just changing jets in a carb, but adjusting the fuel pressure, different plugs, spacers between the carb and intake. These things take time. How much do you want to tweak to get the most HP?



TWM Induction has an article available with some engine dyno charts in it. Click the "Carburetor vs. Fuel Injection" link at the top of the page.



http://www.twminduction.com/ThrottleBody/T...ody2900-FR.html