2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

half bridge + sc?

Old Oct 21, 2004 | 06:54 PM
  #26  
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I was going to have the bridge port done during rebuild.
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Old Oct 22, 2004 | 02:32 AM
  #27  
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If you have to rebuild it anyways, you may as well port it!
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Old Oct 22, 2004 | 06:12 AM
  #28  
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Yay bridgeport here I come!

rotarygod- I'm in north Houston.

What manifolds should I get?

Thanks
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Old Oct 22, 2004 | 11:25 AM
  #29  
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bud - I really don't think you should mess with a bridgeport. I think instead that you should look at a mildly ported 6 port and a custom intake manifold. I really think that you would like this a lot better. This will also require a standalone, but... well any serious mods will need it as well. And with mild ports, you'll still have pretty damn good low end.

edit: look at this thread for one example. There's a lot to be had in the stock ports.

https://www.rx7club.com/time-slips-dyno-128/6-port-dyno-stock-ports-custom-intake-manifold-e6k-358038/
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Old Oct 22, 2004 | 12:33 PM
  #30  
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Originally Posted by Bukwild
I say a video of a forum member with his super charged fc and I heard alot of whinding when he took off but I did not hear the tires squeeling. I would be scheptic until I see some dyno numbers. My freind Dave has a 89 vert and we are heading to pull a m90 out of a thunderbird this weekend. Not sure how long it will take to fab up but I have a feeling it will not put down the numbers people think on stock ems and some 550 secondaries. But we will see.
And if you are going to spend that type on money on a setup why not have ems and a turbo? And at what boost limit will you go until you install a intercooler?
any link to the vid?
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Old Oct 22, 2004 | 03:16 PM
  #31  
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nonameo- I looked at that thread. That is interesting...

How much rwhp would I get out of a halfbridge?
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Old Oct 22, 2004 | 03:31 PM
  #32  
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Originally Posted by BlaCkPlaGUE
The supercharger should also require a TII tranny, driveshaft and differential if you want to avoid any stress issues down the road. Forced induction is forced induction, weather its a turbo or a SC, its gonna put strain on parts, particularily more so on parts that were never designed for high HP. Although I think that the turbo would wear the parts quicker, its still all the same thing.

As for a bridgeport with a SC, it'll work and give out some nice numbers. but I've been told that bridgeporting eventually wears out (what wears out im not sure) and im sure with the added heat of the SC and power, this would be done alot quicker.
What wears out on a bridgeport is the coolant seals(and maybe oil, but i dont think so) because the port gets too close to the seals and they get stressed more. You dont actually have to do full rebuilds, just tear down the engine and replace some of the seals. Also, you dont need an FCD with a S/C since the fuel cut is only on stock turbo'ed cars.
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Old Oct 22, 2004 | 03:47 PM
  #33  
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So even just a half bridge would wear out the engine faster?
I still like the half bridge + SC idea.
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Old Oct 22, 2004 | 04:33 PM
  #34  
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TTT

How hard is it to do a bridgeport? Anyone from this board do them in houston? I have decided to tackle rebuilding on my own, that way I have a good mechanical knowledge of my vehicle.
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Old Oct 22, 2004 | 06:47 PM
  #35  
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speed monkey: I work in Tomball. I am a real estate agent for ERA Whitaker Realty right behind Autozone. I live off of Stuebner and Louetta near Klein High School.

I've got a turbo motor pulled apart on the stand right now if you want to see some porting.
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Old Oct 22, 2004 | 06:53 PM
  #36  
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Holy crap I live like 15 minutes away!

I'm out by Tomball high school.
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Old Oct 22, 2004 | 06:55 PM
  #37  
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I'm out there all the time. PM me your contact info.
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Old Oct 22, 2004 | 08:03 PM
  #38  
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if you want to do a half bridge then you need to run through some of mazdaspeed7's stuff. He's done an n/a half bridge(but not finished completely yet...) and he can tell you how much he's sunk into it and what problems he's ran into and whatnot. I've been through the whole "well what about a bridge on the street?" idea and I don't really think its a good way to go. An n/a like kahrens will be plenty fun unless you've really been spoiled by torque over the years.
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Old Oct 22, 2004 | 08:50 PM
  #39  
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Alright, I talked with rotarygod and I have decided on a streetport.
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Old Oct 22, 2004 | 10:39 PM
  #40  
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Originally Posted by speed_monkey
Alright, I talked with rotarygod and I have decided on a streetport.
if you're handy with fabricating and don't mind going with a stand alone then I'd try the custom intake too
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Old Apr 29, 2005 | 02:17 PM
  #41  
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Originally Posted by Blade8r
are you saying supercharging an rx7 is pointless period? i don't think that's the case buddy. Speacking out like that is saying a half bridgeport Turbo isn't worth it. i don't buy that. an m-90 supercharger can build as much boost as a stock turbo. there have been many aplications where a stock turbo was running a half bridgeport. the persons who have done this setup love their car as it is. it suits their aplication of driving.
Half bridge turbo is not the same as half bridge SC now is it? All of my post here are from first hand real lif experience. I had a Camden charger and it made some gain in torque from 2k-4.5k rpm and then it just does not do a whole lot after that which the motor is in power band. I've driven SC rotaries and I think a well tuned ported NA with good exhaust will out run a SC motor. I drove a Camden SCed red FC once at Seven Stock and the owner thought it was great, well I drove it and it really felt like the charger does NOTHING. I am sure a SC can put out as much boost as a turbo but remeber that is at the expense of torque from the motor, versus a turbo is from exhaust flow. I think a rotary works far better with a turbo because of its natural efficiency of exhaust flow and impact on the turbine, but not so well with SC because it lacks torque to drive the charger efficiently. Bottom line I have never heard, seen, or driven a SCed rotary that has significant power gain over stock motor.
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Old Apr 29, 2005 | 03:02 PM
  #42  
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What the hell are you doing bringing to life a thread almost 8 months old? To begin, yes the camden unit sucks, and those of you who think the heat from a turbo is more than a supercharger, you're almost certainly wrong. The turbos are WAY more efficient at compressing and make less heat in the process. Couple them with a proper intercooler and it's pretty close, but the turbo is always more efficient.

With a whipple setup you can get decent power and gains, but that's going to run around $4-5k.

Go turbo.
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