Snoochie

Very very funny. HAHA But anyways can you superimpose those pictures so we can see like gains across the whole range

Snoochie

My tentative list for future mods will be a racing beat's catback and the canzoomer hi-flo cat. So we can see what the gains from the exhaust are now that we have the porting done. Also getting a piggyback ECU I have no problems doing. This was what I wanted to do first anyways but I don't know how to tune it so if we could work something out Dave I'd love to do that before anything else. Thanks, and lemme know if you're coming down cause that means I have to hurry my *** up and finish my list.

guitarjunkie28

i say a straight pipe into an atr muffler.

unless i call, plan on me picking you up from work. see ya there!!

guitarjunkie28

hey, does the manifold pressure actually get positive in there cars--like the vdi on the 2nd gens? if it does, i bet hp will increase when we change that injector donut.

IcemanVKO

I believe that the pressure does get positive, because the design creates a vortex, from what I read somewhere.

I would bet a leak in the manifold, would not only disrupt the positive flow characteristics, but also, could direct the vortex slightly off from the port, causing a negative impact on flow.

IcemanVKO

Can't you just Duct Tape it? :D

Oh wait thats the new Iceman Cold Tape inDUCTion system I'm working on.

rotarygod

The manifold is designed to take advantage of the very strong return pulses from the opposite rotor when the ports close. It is somewhere around 2 psi positive pressure but don't think the port always sees that much. It is only right before the port closes that it sees this. It just helps get in that last little bit of air. A very small vacuum leak isn't going to affect this phenomenon. It will really only affect idle.

rotarygod

When you do, send the plates to me. We'll test them and see what they actually flow.

Japan8

Don't I wish I was in the states with an 8 now... between guitarjunkie28's port work and RG taking some plates to a flowbench and coming up with some templates... oooh man this is too sweet.

Not to knock CZ and the emanage, but as an alternate solution you could pick up a Ric Shaw piggyback and the "plug and play" wireharness to tweak that afr and timing. That harness just plugs in inbetween the ECU and the normal plugs so that you can make the cuts, etc. on it instead of the actual stock wiring.

rotarygod

Unfortunately I was misinformed about the Ric Shaw unit. I've always said it can control timing split. It can't. Oops!

On a side note, another poor misinformed person on the sister forum just got flaming mad at me because I said how to and not to port a 6 port rotary. The unfortunate part is that he just ported his like I said it shouldn't be done and now he is mad at ME!!! Bwahahahaha!!!! I didn't build it. He probably thinks he is actually pissing me off! That forum is so good for entertainment sometimes. OK, back to our regular program. I just had to tell someone.

Japan8

Well you DID tell him NOT to do it that way... Silly rabbit...

rotarygod

They hate me over there anyways. :D

Japan8

That's just because they're... jealous. Yeah.. that's it. :D

BTW... about ECU's and piggybacks... I like the solution talked about in this tread...
https://www.rx8club.com/showthread.p...2&page=1&pp=15

rotarygod

I think it's cool that they did that. I really want to see snoochie's when it gets tuned. Logic would dictate that the car would run leaner with a port job rather than much richer like it is now. The ecu must detect more airflow and overcompensate for it with fuel. That's the only thing I can think of.

This car is getting a few more horsepower than stock but it is running richer than stock. If you recall that leaning the car out from stock should actually make more power, this shows potential. 11:1 is crazy stupid rich. Take that thing out to 13.5 or so and see what happens! It'll be a nice boost in power.

I still don't think that this (snoochie's) will do any better with an exhaust. The port overlap was not increased. It would have to be altered by 6 degrees closing just to get to the borderline to overlap. Then it would have to open many degrees more to make it useful. Until we see that somehow I just don't think there is much to be had in the exhaust. I really hope I'm wrong though. (If this were the "other" forum, I would be !!! )

brillo

Maybe I missed this, but why didn't you guys do any runs in 5th gear as thats 1:1? Or am i missing something?

In addition, did anybody see Richard's comments about the WHP being measured in SAE? Did that change anything?

RX3+5

Dyno runs are hard on the eight because of the tremendous amount of heat the engine makes. Third gear runs would be the most I would do.

Vince

AutoBahnRX8

I remember reading (a long time ago) about the 8s going into limp mode on dynos unless you fool the ABS into thinking the front wheels are going the same speed as the rear.(believe it was from CanZoomer) Was this done when dynoing the ported 8?

Ole Spiff

I think this experiement is a great success. I was thinking 15+ hp gain would be great; anything more would be a bonus. His dyno sheets show a 14+ increase which is close enough. Get the minor issues sorted out, and remember how the Renesis actually gains power as it "breaks in", and this is a very successful mod.

Congrats you two! This was like reading a great adventure novel; reaching the North Pole; climbing Mt Everest for the first time; best thread I've seen yet on this forum!

brillo

It amazing how hard the computer tries to fight back when you change things, I think over time we are going to find that sum of the whole will be greater than the parts in terms of mods, but the other issue this causes is that it will be difficult to bifurcate the gains from the porting and the ECU changes. I bet with a emanage, and a new cat, your talking 30+whp conservatively. Trouble is people like to think of gains in individual mods.

Nevertheless, the gains look promising, which I hope will prompt others to experiment. Rotary God and I are going to flow test my intake system with various modifications, which I hope when combined with ecu and porting, will yield even higher results.

Congrats guys on the great job, there are alot of people here that thank you for the hard work.

Icemastr

What is your reasoning to run the car in 3rd gear vs. 5th gear? The RX-8 does not generate vastly more heat than any other engine, dyno runs cannont be much harder on it than any other car. Turbocharged cars have more difficulty on dynos, especially intercooled ones because of heat soak greatly increasing IAT. Dyno runs should be done in the gear closest to 1:1 to minimize drivetrain loss.

Snoochie

I would think we'd actually get more than 30whp from the piggyback alone. Which Dave and I decided will be the next modification. Is the Cz stage 2 the popular favorite around here? That's what I hear is the best. Any input would be greatly appreciated on that subject, for it will be the next step in our journey. (And money would also be greatly appreciated, running a little low now :D )

Yeah I figured I would post a little something about what I think. Overall giving this project a grade I would give it a solid A. Not an A+ because the power wasn't as over the top as I dreamt about for weeks. This does not mean at all that it has no power. That would be blasphemy. It has awesome power. Basically what it felt like the first time (w/ the porting) was similar to the first time I drove the 8 at all. You get in all giddy and stall out. hehe. After that it just amazes you. It's really hard keeping it under 6k rpms because it jumps up almost instantly. The sound is almost the same except when you go high up and it sounds just like a vtec like Dave said. Basically I think that's it for now. If anyone has questions feel free to drop them in here or PM me. That also includes if anyone wants a ride I'd be more than willing to when I get free time. Just pay for lunch and we'll go hang out.

Oh I almost forgot basically the most important thing. Wanted to thank Dave for the hundreth time for everything he did. This man is as professional as you can get. Never bullshitted me, never misled me, always treated me (and my car) with respect and understood how much we all love our cars. He runs his work like every company should. With honesty and integrity. I will always use Dave to work on my 8 as long as he doesn't move away or get to busy doing more work. Because after dealing with him I trust him. If anyone wants to hang out with us when we tune the ECU or do little things you're more than willing and I'll bet once you do you'll want him to work on your car. Worth it 100 percent and look forward to this thread never dying. Yee

RX3+5

The reason is that our eights cooling system is designed to have a certain amount of air going through it when making maximum HP. When making a dyno run you will quickly overcome the cars cooling system by simply not having enough air going through it. I've seen it happen to an eight and it's not a pretty sight!

Vince

RX3+5

Get the CZ stage 2 you will **** yourself happy!

Thanks to both of you for sharing everything.

Vince

guitarjunkie28

the fan at the dyno has a 5 foot diameter
but honestly, we didn't use it--we just used the "little" fan with 3 foot diameter...temps never moved at all.

rg, i may be getting a fresh set of irons from mazdatrix. i figured it would be worthwhile to have them around to speed up the swaps. let's work something out with flow testing them stock,

then i'll go ahead and port one of the side plates, and one side on the intermediate plate the same way i did snoochie's. you can test that, and use the other plate and other side of the intermediate to make improvements.

i bet with a little research, it wouldn't be hard to get the "just porting" part up to (or over) 10%...conservatively.


and rich... dood, thanks for letting me play doctor with your engine. i know that was a big leap of faith considering i hadn't posted on this board before and you didn't know me at the time. that was awesome bro!!

Snoochie

Well evidently the stage 2 requires no cat cause it'll fry it. So I guess first on the list of buys is a straight pipe then? Just don't like the super loudness I'm going to have. Might consider that tertiary resonator (i think that's what it's called) I know it has been used with a hiflo cat so can it work not having one? Thanks.