how much power ?

[bnaellis]

with a bridgeported 3rd gen with a hks to4r would 500 rwhp below 20 psi be achievable if tuned correctly ?? if not why not ??

rgds

[Grizzly]

I would say yes it is possable, i dont know if it is possable in the UK but it has been done.

http://velocity.isfaster.com/new/rides/soul/main.htm

I belive Alf ran 24psi on a Half Bridge to achive 520rwhp but he ran into major problems when he went to the next stage (full bridge) as the Turbo was ristricting the engine causing it to fail. He then went to a T51 Kia on a Full bridge but never got it Running 100% (It blew up i belive at 610rwhp).

But you have to remember all this was done in Japan so they have the Experiance and Knolage to build and set somthing like this up.

He was in the Air force so when the Gulf kicked off it put an end to his stay in Japan so it never got finished.

Chris

[bnaellis]

Mmmmm 520rwbhp on a fc lump at 24psi
sounds promising. Hi Chris the car is already bridgeported and has hks to4r etc imported from Japan. Just trying to get an idea of what to expect from it for when it goes on the rolling road.
I have read that the to4r efficency range is approx 18 psi so was wondering basically if running at this psi 500rwhp would be achievable ona bridge not sure if a half or full bridge though. Some nice clips on that site shame they did not run for longer.

rgds

[Grizzly]

Ok, I did\'nt relise you had bought it built.

There is no easy way of finding out if its a Full or half Bridge, Unless you know what one sounds like? The half bridge is quiter (as tought that makes much diffrence if it has a big exhaust and you\'ve not heard one before)

Depending on size of bridge, Exhaust housing size etc you should see 500bhp at 18psi but it will more likely be at the Flywheel you may need to run a bit more boost to see that at the wheels.

I am sure you will have fun finding out why people love Bridges when they are hard to drive and drink alot of fuel as you leave 200 yard black lines down the road in forth gear

Chris

[Grizzly]

http://www.teamfc3s.org/forum/showthread.php?s=&threadid=20300

[bill shurvinton]

Don\'t forget

1. RWHP is a completely meanginless measurement unless you are just after some delta measurements for changes you are making to your car.

2. Be careful of american power claims. They mainly use a dynojet which measures up to 18% higher than a \'proper\' set of rollers.

But back on the question. With a perfectly efficient turbo and intercooler 14PSI will double the NA power 18PSI will be 2.3 times, so to get 500 at the flywheel would need it to be 217NA HP, which is just believable with a stock inlet.

Oh and your power assisted brakes won\'t work anymore unless you have a seperate pump.

BIll

[DRAGON]

Good point about the brakes bill.

[Grizzly]

There are ways and means but you are right the efficancy will be Reduced.

You can fit a Vacume assist Canister that will help.

There is a lot of Powerfull cars out there i thought the US one was a good example of what you can do on a Buget.

At the end of the Day 90% is down to how well the car is set up, if its been played with by Muppets you\'ll be lucky to see stock figures from it?

Chris

[bnaellis]

Hi Carl,

What do you think on this?
I have been told it\'s a full bridge but whether it\'s full or half my main question is with the car being  well tuned is 500bhp at the wheels anywhere near realistic in your opinion at 20 psi?
I am not asking the question so I can then lay claim the car has 500bhp at the wheels or anything, I just don\'t know enough about bridgeports and there potential in terms of big bhp.

Thanks in advance

[jay]

Bit of an idiotic question here but was is half bridge and full bridge. I know I\'m stupid but what can you do. . . . . :confused:

[20B_boy]

You can see basic descriptions of the various port jobs here:rotary porting

A bridge-port achieves a very large inlet port size by breaking out toward the edge of the side housing (see how much closer to the coolant passages the edge of the bridge port is compared to a stock or extend port), retaining a thin \'bridge\' over the middle of the port for the rotor corner seals to pass over (without the bridge the corner seals would fall out of the rotors and drop into the intake port - bad thing!).

A 13B-REW engine has four intake ports; the smaller primaries in the intermediate plate and a secondary in each of the front and rear plates. A half bridge port only has two of the four ports bridge ported, a full bridge port has all four ports bridged.

HTH.

[20B_boy]

If you havent seen an engine without its gubbins removed then the following pic shows the intake ports (green arrows are the (very!) rough flow of the intake charge into the rotor housings) marked P for primaries (in the intermediate housing) and S for secondary\'s (one each in the front and rear housings)

The pink arrows denote the hardened faces of the rotor side housings that you can see various ports chopped into in the link in the previous post which shows the various port types...

HTH.

[Carl]

Originally posted by BNA_ELLIS
Hi Carl,

What do you think on this?
I have been told it\'s a full bridge but whether it\'s full or half my main question is with the car being  well tuned is 500bhp at the wheels anywhere near realistic in your opinion at 20 psi?
I am not asking the question so I can then lay claim the car has 500bhp at the wheels or anything, I just don\'t know enough about bridgeports and there potential in terms of big bhp.

Thanks in advance

Hi Brian,
I think that if you are running around 20 psi then the turbo will heat up the intake charge a fair bit so you could say that you may have around 2 times the volume of air going into the engine as if it was naturally aspirated with a cooler intake charge.(This is inspite of running over 1 bar)
On this basis I would say that with the fact that probably with the full bridgeport the engine could be running around 250 FLYWHEEL hp naturally aspirated that 500 FLYWHEEL hp is possible,but not 500 REAR WHEEL hp which would be approximately 590 FLYWHEEL hp.
If the engine is half bridge port then say around 450 flywheel hp.
I would strongly suggest that you carefully check the A/F ratio on this car as it may well be running close to lean,use a good fuel like Cool blue from 76,it is 106 octane,Clive can supply it.Bear in mind the higher octane available in Japan.
This would give you some margin on the rollers with regard to knock.
When you get your results please let us know.
One thing to allways bear in mind though is that rolling road figures are not accurate in terms of saying how much power anyone really has,they are just useful if you go back to the same ones each time to see if you have made improvements.Rolling roads can vary from each other by as much as 20% so just use it as a guide.
Kind regards
Carl

[Carl]

BTW I forgot to mention that we are talking of your specific turbo here as a bigger turbo may not heat the intake charge as much at 20 psi.
Kind regards
Carl

[bnaellis]

Thanks Carl,

It would be nice to strip the engine see how the bridge has been done in Japan and  get Tim to copy another one for me. After driving it I am really tempted to have a bridge ported engine built.
A triple rotor bridgeport sounds very tempting with a nice turbo charger to help things along.