Marcel Burkett

Let me start by stating a bit about my set up , 1995 R1 , complete rebuild with HURLEY racing springs and apex seals together with HURLEY side seals, street port (so far) oiling mod mentioned by RICE ,removal of the thermal pillet ,JUN 10.5# cromolly fly wheel , INDIGO pulleys , devided 2"exhaust manifold with separate wastegates , T66 (T70 comp. wheel according to TURBONETICS specs.) with 1.15 tang A/R ,P trim turbine wheel, 3" intercooler piping ,large NPR intercooler , 3.5" d.p and custom 3" exhaust piping after , E6K ,1300 cc and 850 cc injectors ,Aeromotive pump ,PAXTON regulator , AQUAMIST water injection (360cc ) jet ,MSD 7AL on leading plugs etc , etc .
My intention is to use the car daily on the street ,boosting 18-25psi and to make as much power as I can , the problem is the porting , after reading as much as I could and seeing RICES ports I am not convinced or satisfied that mine would be sufficient ,especially the exhaust potrs whish weren't raised at all (by cutting the chrome), only lowered about 2-3 mm and raised a bit inside of the port to meet the sleeve , finally the question is , should I do a bridge port on the secondary ports and go more radical on the exhausts ports ? , what kind of overall power ,performance, transient response and RELIABILITY can I expect ? ,please answer CRISPEED , RICE , GREG , HWO , ReTED ,GMONSEN and anyone else who might have any kind of an input , thanks.

KraftDinner

State your HP goal then I'll tell you if you should bridgeport or not

peejay

What is the point of porting the exhaust if the top is not raised? The port window is more than just the opening and closing, it is also the beginning of the port runner. Especially on a bridgeport, it's not as if you're going to be able to avoid massive overlap or anything.

Marcel Burkett

H.P. goal..............Too much is just enough !! , as for your opinion on the exhaust porting ,peejay , I totally agree ,but the guy who did it dosen't agree and says that he has found that it doesn't make any difference.

HWO

To get the most out of a bridgey (turbo spec BP Secondaries - like my motor) you will need to raise the exhuast ports. How big are your intake ports? RICE sized? the thing is you are going to need to blow 25psi with your current porting (by the sounds of it) to get the same HP you will get by running 18psi with a bridgey.

But it sounds like you wont get what you want from a bridgey in far as std like streetability, if you are prepared to put up with the HARDCORE nature of a bridge port then by all means go for it. My car sees very little daily road usage and has been built up for car club events so it doesn't phase me

Marcel Burkett

The important part about streetability to me is the gas milage , the rest is unimportant , hell I evev run an EXTREME ACT clutch with a six puk ceramic disc on the street.

Marcel Burkett

And what exactly do you mean by "the HARDCORE nature" of a bridge port ? .

KraftDinner

You don't want a bridgeport then... unless 10 mpg is a good goal of yours
It's kind of hard (or impossible?) with a non-renesis rotary to get big power and still have decent fuel mileage.

streetpower

i say brigeport the sec's..and open up that exhaust...**** gas mileage....you will be 1 quick steet car..maybe the fastest in trini.....

Marcel Burkett

78 views and 5 answers ? , com' on guys!.

KraftDinner

If 450 (or less) rwhp is your goal, stick with the streetport. I think your exhaust ports will be ok, but if you really want to you could raise them a mm or so. Step up to one of the big boys (T78, T51 Kai, GT35/40, KKK2, etc) and boost low 20's psi (you said 18-25) and that will give you 420-450 rwhp with proper tuning.

If you want huge 13B power, like 500+, then half decent fuel mileage is out of the picture. Bridgeport the 2ndaries and you will be over 500.

Marcel Burkett

POWER is thename of the game , I have been running air/gas ratios that were way off (which may have contributed to the blowing of the rear rotor ,plus the fact that my ignition was way advanced and my temporary water supply( water injection ) had run out without me knowing !! .I mentioned mileage , but **** that , I need to really kick some piston **** (HONDAS ,NISSANS , TOYATAS and the like ) and rule the roost down here , keep it coming guys . !!!!.

HWO

porting the exhuast ports is going to effect turbo spool up, big ports equals - reduced lag

the bridgey will idle with a whack whack whack - beautiful sound in my opinion but some people think its too extreme for a street car - your gas consumption will be crap, but if HP is what you want, and it seems thats what you do crave then a BP will deliver the goods

Marcel Burkett

where are the other "rotary gurus" (RICE ,CRISPEED,ReTED and others)

HWO

reTed will tell you not to bridge port, cause ya know if you had a bridgey and he had his car and you were only racing to 4000rpm he'd walk all over you............

amemiya

do a bridge port if you want HP do a street for if your ***** hurts.

Marcel Burkett

O.K. after reading these (few) replies and checking it out on other forums , I decided.................... bridgy ( half) or bust.

RICE RACING

If you want good economy or even reasonable economy, then you do not want to do anything larger than a conventional side port (street or otherwise)

All of the porting techniques above this suffer from poor low load fuel economy (90% of street use), no matter how you drive them..... something to keep in mind.

You will not be able to enjoy this side of your performance cake

InitialD FC

iTrader: (1)

It is all in the port, power vs. fuel. Something has to go, as far as running ridiculous on the street, you can run anything you want to on the street, as long as you got a plate and anything else you think is necessary to keep the cops away.

I ran my t76 semi pp motor on the street, drove it everywhere, its my only car. Its all in what you will sacrifice for your street car.

Marcel Burkett

Finally I hear frome RICE !!!!!.

Marcel Burkett

AY Rice , I read your reply to my pm. , I decided to sacrifice some economy for increased performance ,so I will go with the half bridge . I already owned a streetported turbo so I am familiar with the power , I think I want to try something new , and every one down here is going streetported turbo , so I want to get the " edge " on the competition.

HWO

Totally agree mate, It all depends on how much of a fanatic you are. When i require a PP turbo my car will still be road legal and it will see some street usage.

Other just have to remember that guys like Ted are getting old and soft - no offence intended but ANYTHING is streetable, You can have every slice of cake, with cream and cherries on top AND eat it too

Grizzly

when u say the fuel economy will be excsive on the Bridge is that comparing the two types of porting at the same Bhp? ie for example two cars with the same set up (turbo,fuel etc) one has a big extended port and the other has a Half bridge runing diffrent boost to keep the BHP the same (roughly) will the fuel consumption be simalar? as the street will need to run more psi but there wont be much in the cfm of Air fuel being put in the compresion chamber?

What i am trying to say is the Extended port better on fuel due to the less bhp its running? i under stand that the whole set up of the two engines (Ecu) will be diffrent but in theory is this how it works?

peejay

Don't even worry about the power production... max HP has nothing to do with low load low RPM operation. Just think about how a bridge/peripheral port engine idles, i is constantly stumbling over itself with any appreciable manifold vacuum because the overlap period allows the manifold vacuum to draw exhaust gasses up into the next chamber causing the cyclical misfiring that makes rotorheads smile but hurts economy.

Marcel Burkett

Can't I lean out the idle maps a bit to compensate ? .