fidelity101

iTrader: (11)

your not going to hit 200whp on a 6pt streetport fyi.

peejay

Color it "all ducks in a row, great engine build, everything 100%".

So, it doesn't happen by accident, or even on purpose most of the time.

jorx7

iTrader: (11)

im running a walbro 255 pump, you cuold use your stock pump though wont hurt you.

23Racer

I know that this is off topic, but what front and rear flare kit do you have on the car? I am thinking of putting a wider wheel and tire setup on my car and those would do just fine.

I am certain a bunch of you will say, "idiot, its a blah, blah, blah and you should know that", but it looks really cool and easy to install. It will give me the clearance I need for the setup I want to run. Any clues as to where I can pick up a front and rear flare setup like that?

Eric

jorx7

iTrader: (11)

not at all, its race on rear flares 30mm i think , shine auto makes them now so get them from him, and front is cork sport fender flares, just cut the upper stock fender and rivet on, i got whole wide body and side skirts from a forum member, so all work was done.

petex

so much misinformation in this thread..

real bridge port (looks different then people show on this forum) makes power at 8000rpm and up producing 250+rwhp for 12A and 300+ for 13B. most people run 12A cuz they are better suited for bridge, indeed running 3mm seals, cuz in 12A thats all you can. at that point, all you have to worry about are gears and bearings, meaning you dissemble and reassemble the engine due to worn bearings more often then apex seals.

its pointless to run a bridge port if you not planning to go more than 8k rpm.

Liborek

Explain

Still stuck in internet forum knowledge that bridgeport, peripheral port etc. is high RPM stuff only? Do you know that 787B in endurance trim didn´t exceed 8000 RPMs? By your reasoning they should use street port or what?

Much to learn

23Racer

Interesting statement. I run a 1/2 bridge NA TII with NA S5 internals and on the August 1st weekend, the car was able to spin the rear tires pretty hard in 2nd gear at 2,500 rpm and then pull strongly all the way to well over 8,500 rpm. It was like driving a Trans Am car or an evil handling American V8 car as it just wanted to spin the back tires down low in the rpm range and this was with hot Toyo RA1's in very good condition. I was leaving nice rubber lines as I pulled out of the corners and this was with 4.10 rear gears and a stock NA box.

For the first time since I put this package together, it is doing what I was hoping for, giving good torque and still pulling hard at redline. Just need to get it on a chassis dyno to see what it is producing.

To the point of this part of the thread, good street port or a mild bridge port can still make decent power and be tractible.

Eric

fidelity101

iTrader: (11)

two ways to make power in an engine (na)

1. make it bigger
and/or
2. spin it faster

peejay

Get out of here with your real world experiences! The Internet told me that bridge ports make so little power under 7000rpm that turning the lights on will stall the engine and fourth-hand BS is way more believable than your "experiences"...

peejay

3. Open the ports a lot earlier so that there's more port window open before closing it


By the way. I think I found my missing power. Gonna find out tomorrow. My exhaust is... more open... nowadays. And yet it is also quieter.

Half bridges freakin' rule. You get a lot of the advantages of a full bridge with almost the same tractability as a street port. My car is 100% drivable except for one small niggling point: You can't drive at near zero throttle below 4000rpm. This makes city traffic a kind of pain unless you always shift into Neutral, coast a bit, put it back into 5th and accelerate a little, back into Neutral, etc.

I do say "six ports suck" but I tell you what. This half bridge -SE engine still feels a whole hell of a lot stronger than the street ported S4 engine I built. And I'm only running the -SE engine to 8000, the S4 engine would see over 9000rpm... which it needed to do since it didn't make any torque.

papiogxl

iTrader: (6)

Nice to know I'm not the only one with the very little throttle issue on a HBP. I still need to do some tuning to clean up some small issues with mine, and change the cut BR9ES's out for some stockers to see if I get any difference in running. What IM are you running Peejay?

23Racer

LOL, I also have a 4 throat ITB setup on the car that, of course, will again only pull hard above 7,000 rpm.

I have some video that was shot from my buddy Al's peri port RX7 as he followed me around the track. Its really interesting to see th differences in the cars and where they are each quicker. His car is about 200 lbs lighter than mine and he has a 4.88 rear gear, but I was able to come out of this really tight hairpin (with both of us generating quick power oversteers) and hold him off all the way through second gear. He would catch me and pass me as he has about 2,000 rpm left in his motor and can carry each gear longer. I could also pull away from him down the front straight as the gearing worked a lot better for me.

If I recall correctly (I didn't build the engine, Joe from RPM built it) it has a Judge Ito extended monster street port primary port, a Racing Beat Bridgeport secondary plate port and a Racing Beat racing style exhaust port. It is very flexible and now seems to be running incredibly well and truthfully, I have seen no point that the pulling slows down or drops off. The only thing that makes me shift is fear.

Eric

peejay

I noted the same thing with the S4 N/A intake manifold. It just kept pulling and pulling. I can't wait to try out a new combo with the Holley manifold.

So it's not misunderstood: My 3mm seal comment is for IRON seals. Carbon-aluminum seals obviously do not have this RPM limitation.

23Racer

Actually, when I ran a 6 Port, I tested an S4 and an S5 manifold back to back a couple of times. I was always faster with the S4 intake. This was on a stock port S5 Mazda reman that was donated to me by Mazda Canada. I think that the S4 was more flexible pwer band wise.

After we went to the ported TII engine that I am running now, we put a holley intake on it with a Holley 650 double pumper. Car ran really strong, but got enormously crappy gas mileage. It has only taken 4 years, but we have finally got a setup with the 4 ITB's that is actually faster than the Holley setup.

Eric

peejay

Good to know I'm on the right track. I plan on using a mechanical secondary carb (has 38mm throttles, a *little* small) with the venturis completely bored out and all fuel passages plugged. Basically, I'm turning a junk carb into a progressive 4-hole throttle body.

Depending on round tuit availability, I would like to use a GSL-SE and an FC primary rail back to back and inject fuel above the throttle plates.

fidelity101

iTrader: (11)

thats it! I'm going semi PP

j9fd3s

iTrader: (3)

why? go full! the only penalty with the PP is noise... mufflers die quickly

peejay

SHHH!!! We're in the same class when we hit Detroit SCCA rallycrosses. I'm trying to be faster than him.

And I have seven S4 N/A rotor housings that I wouldn't feel bad about turning into peripheral port housings, since they suck. (Probably only one doesn't have significant flaking) Until I go that stupid-long project route again, I think I may be able to put together basically a copy of Eric's engine as described above.

I am not asking for much, I just want 300 crank HP like the Group B cars had, but I want it street drivable, so it has to have things like functional heat and maybe not be horribly loud...

fidelity101

iTrader: (11)

hrmmm.... okay

rotormind

I don't no y but my car was always faster when it was quieter with same exhaust. I think it has to do with timing, but I was running the stock computer, which I think was all over the place. I was running a header straight to one muffler and for a long period of time, it wasn't that loud. But after a while the volume was turned all the way up and I don't know why but lost a lot of power, and it wasn't an exhaust leak incase u guys were thinking that.

julesfc3s

please post more video I want to see how it's puling hard from incar.

jorx7

iTrader: (11)

heres a quick one, try to get some more..


http://youtu.be/2tgBfmBDg9w

jorx7

iTrader: (11)

some flames


http://youtu.be/adzyuMhhHWw

jorx7

iTrader: (11)

i raced my friends 88 t2 a week ago, stock motor stage 2 turbo, full 3inch piping, light weight flywheel , stage 2 clutch, intake, fuel cut defensor. did 3 pulls to 120ish, he was by the end of my door when we let off. were planing a rematch soon.