we are going to put my friends engine together and want to do a bridge port it is turbo 89FC. I have heared good and bad with bridge porting a turbo motor. any input???

 

does a bear **** in the woods???????

HELL YES

 

lol

 

Of course it will show gains, What you should be asking is what is the Pro's and cons of doing a Bridged Turbo?

When you say Bridged do you mean Partial Bridge (ie Secondrys)? if so what sort of set up are you running? you are going to need the lot (T04 Turbo,Ecu,Pump,Bigger Injectors,FMIC)

If you dont have all this now i would Street port it while you build up your Mod list.

Yeh you have lots of Mid to top end power on a Partial but you do drop some of your low down power compaired to a good Extended port. You also have to think about your Turbo set up etc, if you have a big Turbo it will leave you with no bottom end power and Massive top end you need to find a happy medium.

I found BB Turbos are made for Partial Engines i am precently looking at geting a Garret GT40 Devided etc.

 

nice has anyone done it that could share what they noticed. ( soul asassin)

 

I dunno...I was talking to Rob @ Pineapple Racing and he recommended against going bridge port with a turbo on a street car. He said that even with a partial, the overlap causes too much cold(er) air to be pushed out the exhaust, drastically reducing spool times. Because the turbo spools much better on HOT air, the colder air going through the hot side of the turbo would hinder performance. Not saying that it reduces (peak) power or driveability in any way, just doesn't allow the turbo to spool as quickly.

He explained it much better than I can. I suggest you give him a call and chat about it!

 

yeah I have already done that many many times. I wanted to know if anyone has done it and what they noticed

 

That has to be the worst opinion I have ever herd .....

A BP will make the turbo spool MUCH MUCH faster, he (Rob) obviously has no idea what he is talking about, either that or you left out a lot of what he actually told you ?

A BP's only bad points are incresed noise along with higher fuel consumption at cruizing revs and light loads.

It sure as hell spolls alot quicker than a street port, has alot more mid range power ...the difference is extreme

 

BP's also have to idle high(1600 rpm's+). Rice racing is correct when he says it's a BIG difference. I've ridden in Igy's FD with BP and it's a SCARY difference.

 

Unless this guy is basing his opinion on actual experience due to bad BP technique or just guessing I would have to say he's got no experience with bridge ported turbo motors. I've never found any other port combination that spools a turbo as quickly as a BP or PP!
BP's also give wider Power and Torque bands in the curve!
****! I can get 12 to 15 psi just free reving the motor and if I want 20psi + bouncing off the two step!
The trick to making BP's work is choosing the right combination or parts. Turbo and wastegate selection, intake and exhaust length tuning combine with the proper A/F ratio and ign. timing with the right amount of turbine inlet pressure are what's needed!
Overlap can be your friend or enemy! Done correctly and you make a lot of power. Done incorrectly you make less power.


crispeed
87TII
9.20@150mph

 

man cris you just scared the crap out of me.. the wastegate would afect the bridge port combo? and would the stock intake need to be shortened?? and what do I need to do to the IGN timing??

thanks for all your guys help it is greatly apreciated.

 

Not recommended in a street car, unless you like having very little power under 4kRPM...

We've gone over this debate many times in the 2nd gen section...




-Ted

 

I had another experience. Lag was much reduced. 10 psi felt more lik4 15-20. Placing a "Y" pipe into the downpipe boost increased to 15 psi - the car was breaking loose on 11.5" ET streets in third gear.

On the other hand city driving mileage was reduced, however highway mileage wasn't that bad. The noise was also another factor. The car also did not want to idle below 1,500 RPM.

As far as a bridge ported motor for a street use only car, you may want to stay with a good street port or a secondary bridge.

 

How much power do you want and where do you want to produce it? As the man says its all down to your set up. The Soul Assasin car runs a Partial every day and that has a Massive T40R on, maybe you should be asking Alfred?

Put it this way if you want a High reving Monster with masive mid range but a pain to drive it traffic do the Partial but if you want a Road car, mild manered but has the capability of running 450 bhp then stay with a Big Extended port. At the end of the day you are going to need a good clutch wich ever way you do it so that alone is going to make low speed driving harder.

You have to experiance one then you will love the Midrange power.

 

I don't mind at all the loss of low end power, we don't have any anyway. I love the high rev. the turbo he is running is a t60-1 I am running the t51R KAI would these turbos be good comdo for bridge port???

 

What is the difference between an extended and a PBP?? Is an extended just basicaly a really large street port??

 

yeah I think it closes later or opens earlyer

 

http://www.geocities.com/MotorCity/P...8/porting.html

just ignore the last sentence... and also 180hp from a stock port 12A is pretty suspect unless Australia got some pretty huge ports from the factory...

 

My motor is ported, though I dont know what level. It is loud. It stinks. It gets 10 MPG. It has NNNOOOO power off the line. From a rolling start they dont have a snowballs chance in hell... Write me if you want to know more..., check out my profile to see my setup.
~Jeremy

 

man cris you just scared the crap out of me.. the wastegate would afect the bridge port combo? and would the stock intake need to be shortened?? and what do I need to do to the IGN timing??

 

Extended port = Street port. They are one and the same. Basicly all you do is take the wide part of the port back 10mm, which keeps the port open longer, if you are doing a mild mod you should'nt play with the thin end as this messes up the Overlap. I would always recomend buying the proper Templates.

I have always been led to belive that the more you port an Rotary the louder it gets. There is always the problem with muppets messing there engines up then saying the car is S**t, if you do the work right ie. know what you are doing there should'nt be a problem.

 

the more overlap duration the 'louder' it is

 

10mm that's it? sheez i went up lots more than that... 'course most of that was in blending the back wall into the surface of the housing.

 

Baby mod! Just invest in Templates.