RX7WEEE

iTrader: (16)

Has anyone done this?

When I go 20b I'm thinking i might try that. I like my 13b 1/2 bridge port IMO the 20b would be even better!

t-von

iTrader: (8)

A half bridged 20b would be insane. I would love to hear one!

RX7WEEE

iTrader: (16)

hehehehe me too thats why i think im going to do it, my builder said that he would love to do it

87GTR

iTrader: (61)

yeah once I find a fc to put my engine into I will also be doing the 20b half bridge. I had a 13b half bridge and will never go back to a street port.

kenn_chan

ffer
I used to be stationed on Oki , how do you get past the Sniffer? I was thinking about making a side port, or half bridge here in Yokosuka, but the sniffer got me on my last side port, (barely) and I hadn't even thought of a half bridge.

Marcel Burkett

I had a 13B half BP too , it was "extreme" , but I'm now changing to a semi pp !!

GUITARJUNKIE28

i'd rather go with a semi-pp 20b. that way you can always go back to something relatively conservative if you want--just get new rotor housings. if you dig into the irons on a 20b, they're pretty hard to replace if you decide you don't want that much overlap anymore.

t-von

iTrader: (8)

You have a really good point. Only thing is you would have to have an expensive custom made LIM. I've never seen one for a 20b before.

GUITARJUNKIE28

i'd just drill the pp holes in it. those could be plugged back up if you ever go back.
but since i've never done either, i'm shooting in the dark. might be worth looking into though.

RX7WEEE

iTrader: (16)

well im going to go with the most agreesive street port i can get for my car, and if it doesn't look big enough i might just have it 1/2 bridge'd, 20b that is...

GUITARJUNKIE28

even "just" a streetport should be good for 700+ hp.

RX7WEEE

iTrader: (16)

But, im crazy, 700rwhp itsn't enough for me :P

GUITARJUNKIE28

you sir, are a sick man. i like it!!

RX7WEEE

iTrader: (16)

thanks

GUITARJUNKIE28

wish i lived closer...i'd help out with that pj

FDNewbie

iTrader: (10)

Two questions:

1) Would a 1/2 bridge still kill the engine's life? (like 30K miles)? And does it affect it's reliability, or just it's longevity?

2) Is "semi-pp 20b" a semi peripheral port? I take it that's basically a step past bridgeporting, right? Shifting your torque curve very high up in the powerband, very very little lowend (even less than a bridgeport) correct?

GUITARJUNKIE28

1) engine life depends on how you treat it. i commuted with my halfie up until it got stolen.

2) yea, it's bigger than bridgeporting, but i don't think the rpms would be rediculous. everything depends on everything....port timing, turbo setup, balancing, etc etc. and the low end will be just fine. my bridge had about the same power as stock below 2500rpm, but once the turbo got spoolin, hold on!!

so the powerband would be shifted, yes, but probably not as drastically as you'd think. and a 20b has plenty of low end to begin with.

FDNewbie

iTrader: (10)

O M G. I just got soo sick to my stomach. I'm sooo sorry to hear that man. Did insurance cover it? That's the worst. Really.

Gotcha. 2500...hmmare you referring to an FB, FC, or FD? Because the FD is VERY responsive at 2K - 2500 rpm in sequential mode.... Cuz for example, w/ some large singles, you only have 150hp or so under say 4K rpm, then all of a sudden you gain like 300 horses in 500 rpm LOL. Basically you have NO low end. You can get schooled by a civic off the line up to 4K. I really don't like that setup (not cuz I'm worried about the civic, but because it's not very practical, and I'm huge on low end torque too). Given that, do you think a bridge or pp would be a bad idea (for me)? Lets say if I stuck w/ twins, so the turbo setup wouldn't be for high end only...

RX7WEEE

iTrader: (16)

the stock twins on the cosmo are soo small that in paralle they spool almost too fast... in seq mod they had a problem with the 2nd turbo hit and it would create too much TQ at too low of a RPM and would damage the E shaft, this was on some earlyer 20b's

GUITARJUNKIE28
I got an airplane i could fly down and pick you up

FDNewbie

iTrader: (10)

Yea I heard about that prob w/ the stock twins. Ok then what if using a small single? The point is, if you have a turbo setup that's great for low and mid range power, would you still see a lot of low end delay in power delivery? Or would that even be a poorly matched turbo for your setup?

GUITARJUNKIE28

you pick me up and drop me off in the airplane and i'll port and build that thing with you

newbie, it was an fc...sorry.

now i was going to do sequential twins with my friends 20b, but you're making me think twice now. are there any issues with that in the later models (c code)?

FDNewbie

iTrader: (10)

AFAIK, they upgraded the e-shaft and backing plates on the C & D series to address those issues.

GUITARJUNKIE28

cool beans.
this was gonna be a streetport anyway. i wouldn't do anything larger than that witht he stock turbos...they wouldn't flow anywhere near enough to justify it.

RX7WEEE

iTrader: (16)

A T70 would spool faster than u would want it to LOL. mid range would OWN
it would be perfectly streetable acorrding to your def.


my deffention of streetable is differnet. If it can get above 2 mpg its streetable....

FDNewbie

iTrader: (10)

Streetable to me is having your power distributed throughout the powerband. Something you can push when you want, and relax with when you want. Yet having 150 hp for the first 4K rpm, then gaining 200 horses in 500 rpm, and continuing to go up like that...that's def. not streetable IMO. On a hot summer day, w/ excellent traction, going 3/4 throttle could send you into the wall sideways or even backward, even if you're 100% straight to begin w/. Not my cup of tea...