SoRRoW

I got the main ports on most of my plates almost done.

I was going to bridge the end plates.

Does any one know the high and low guesstimate of the HP,I might be getting?
RB intake Holley 600 double pumper.

I might say **** it,and just make the street port a little bigger..

Whats the high and low on HP for a large street port.?

Im 3/4 done..and dont know what I want now...

peejay

Large street port.... high 260, low 90.

An engine is much more than the ports. Especially as the ports get bigger, the exhaust plays a bigger and bigger role in determining the power output of the engine.

SoRRoW

You sure the low is 90?



Heres my set up right now.

RacingBeat intake
Holley 600 double pumper
Holley blue fuel pump
RacingBeat road race header
2 1/2 in exhast..no cats..


I wonder about bridge porting the end plates..

I think ti wil still be good on low RPMs cause the primaries are street ported.. and still have that high bridge power band..



I wonder how much that set up will give me..

peejay

If you have all stock parts and a shitty muffler, 90 is not only out of the question it might even be on the high side!

nimrodTT

Why not a full bridge?

mperformance

seals....$

SoRRoW

I realy doubt that...

Even on stock ports I was well over 90 hp..lol




I want to try the street port ont he primary ports...more streetablity..

and let me know when you find 1 peice Apex seals cheap.

rotarygod

iTrader: (1)

If you only want to streetport 2 of the ports for drivability reasons then just do the secondaries. I have all of mine done as big as I can get them but the intake and exhaust also take this into account.

mperformance

sorrow...GO FOR IT!

I think your HP range will be carb dependent more than the actual ports you make. Tuning that holley can be a pain in the a$$, once you get it going it will be like getting free POWER.

Do the half bridge, you already started porting it and if the one piece seals are $ then halfbridge it and later on in life do a full bridge.

PaulFitzwarryne

sorrow In simpe terms you are asking which of the two you should go for streetport or bridge port

The response by Peejay is correct, the power you actually get will depend on the other parts of the set-up. Get one way out and you go backwards.

The typocal claimed output is 240-280hp and 190-230hp streetport.

Going bridgeport will get you around 40hp more than a streetport The downside is cost, driveability, reliability, and whether you may have it passed by the local authorities and police. If its to be your race car, go bridgeport, if its to be a daily driver, hold the grinder!

AdrenalifeRX7

I have an aggressive street port job with a T04 turbo and I am making around 350+ HP easily at 12psi.

REVHED

How is that relevant to this thread?

Sorrow, go for the secondary bridge-port! You'll regret it if you don't.

Terrh

iTrader: (7)

Actually, you might regret it if you do.

If this is going to be a street car, I wouldn't bother going with a bridgeport. I've thought it over enough with my car and decided to go the big SP route. You simply can't put a big and short enough exhaust on a street car to satisfy what a bridgey needs. It'll be WAY too loud for the first two weeks, then you'll put a smaller exhaust on, and then it'll be great but have no torque down low because of the ports, and no HP up high because of the exhaust! Worst of both worlds!


Of course, this is just my two cents, so feel free to ignore me and go the full bridge route.

peejay

Stock PARTS. Thow the stock carb back on and still use the stock fuel pump and the stock exhaust and stock everything, you'll probably still make 100hp. Maybe less.

Porting the engine is not guaranteed horsepower, guys.... the engine is a "SYSTEM" from the air filter and the fuel tank, all the way to the exhaust tip. Porting allows more power, if the SYSTEM will allow it, and everything is tuned half decent.

DriveFast7

iTrader: (1)

240-280 with a streetport? A 2nd gen 13b 6 port streetport with weber dcoe and 38mm chokes put 186hp to the wheels at a dyno, I saw it myself. It's an EP car. That power is a hair low.

The figure I hear all the time is 12a streetport 225hp at the flywheel. This is from the road racers.

My 12a Jbridge with 2-piece ceramics and 42mm chokes in the dellorto is putting out 196 at the wheels and I've barely begun to tune it. It's running real lean (13.5-14:1) in it's powerband and only has 18* timing. I should get another 30hp once it's all tuned right. You don't want a full bridge on the street. lumpy idle @ 1800rpms and has to be loud for the exhaust not to choke the motor.

SoRRoW

I guess you didnt see the pics..here take a look..

https://www.rx7club.com/forum/showth...hreadid=169717


Yeah I can get the basic tune on the carb untill i get the engine broken on with some miles,then I can get it to the dyno and have someone tune it. $$$$


This wont be a full bridge or a full street port..

The primaries (center plate) will be street ported
The secondaries (end plates) will be bridge

I still dont know HP or drivability wil be..


For all of you wondering if it will be a street car,yes it is...NOT a daily driver,

I nees somethign for the weekends to beat up on the V8S and Hundas

Ohh and I love killing boosted cars..

Before the port work,I got 2 TALON TSI under my belt,I dont knwo if the drivers didnt know how to drive or if the cars were POS but I killed both,I litterly killed 1..
I didnt see him next to me and I looked back in my mirror
He pulled off the side of the road,with smoke coming so bad from under his hood..it looked like a house was on fire..

This car will still have probaly full interior,it will be registared/tagged...My local laws dont care about engine swaps,inspections,or emissions..

Now the engine noise is something diffrent,But for late nights..who cares

SoRRoW

The day any of you see me throwing stock **** back on my 7s will be the day I cant drive anymore..

I couldnt deal with the stock set up..

peejay

I did it...

SoRRoW

sorry to hear that..

peejay

That explains why I was only making 130hp out of a streetport, doesn't it?

- Pete (still got consistent low 15's out of the sucker though)

SoRRoW

I got that from stock ports..

peejay

Yep, probably.

Porting is free, though, so I did it. Carbs cost money, so I didn't do that.