ROTA_MOTION

and will it be reliable and how much power gain?

TriTurboGen3 RX-7

I don;t think think this is possible to make any BP reliable as doing a BP small or normal Increases your RPM and brings in more Air.

As for HP gians what kinda of 13B you want to do this to, 13B-REW(fd's) or 13B (N/A 2nd gen or turbo?)

rotarygod

iTrader: (1)

I just built my 6 port GSL-SE engine last week and damn near bridgeported the aux. ports. It would be reliable since a really small port does not effect the integrity of the water jacket. Of course you would get a power gain. How much depends on how big the port is, how free flowing your turbo is, intake is, etc. The bigger the bridge the better flowing your exhaust better be, including the turbo. You want as little back pressure as possible for the best results. Your power range will shift upward in rpm and your fuel mileage will go down.

ROTA_MOTION

i want to do it to the one in it now. i dont even know if its a six port, it's a 1988 with a 13bt (how can i tell a s4 or s5?) its an f3cs. what does that mean to you ? i want to go faster ive done :
fmic
12psi boost
chipped comp
3" manderl zorst
t4 comp wheel in std turbo
air filter and cold air box
bov
no egr
has a big plate bolted to the back of the inlet manifold.
air pump gone.
manual

i want to go faster but what to do? need help
ive heard about these mods:
taking out the two throttle buttiflies.
diconecting the water going through the throttle body

which ones to do? any others?

i was thinking of building another motor has to be 13b and turbo.

mostly i want that brap brap brap sound!!!!!!!!
not to over the top thoe.

rotarygod

iTrader: (1)

You've got a turbo 4 port motor. To tell if its a s4 or s5 look at the thermostat housing neck. If it is metal with a filler cap it is an s4. If it is black plastic with no cap, s5. If you have the stock exhaust housing I wouldn't do the BP. If it is VERY small you may be alright but a decent sized one will make you lose power over a streetport due to backpressure causing more intake gas dillution from the exhaust. A larger exhaust housing/wheel would be needed. The other mods...do 'em.

ROTA_MOTION

cool are there any more easy mods to do? will a small bp give me the cool sound?. and would i be able to run the std injectors and comp? what porting do you recomend? i need to go a bit quicker, also its not going to be a daily driver, but will be driven on the road most of the time its out

NZConvertible

All the turbo's are 4-port, not 6-port.
There's no point in bridgeporting a turbo unless you're aiming for serious power. Yes it will increase the engine's ability to make power, but since 400hp is achievable on standard ports, why spend the money on porting?

ROTA_MOTION

sweet 400hp

1) what do i have to do to my car to get that?

2) it wont go brap brap brap!

can i not just bp with the mods i have?
i spose i wont have to build another engine HUMM thats 1 good point.

still is it worth bp ing one for a rainy day? still can the std inj and comp and my turbo (t4 comp wheel) suport a 13bbpt or 400horse?

pvt.Cowboy

You guys from NZ are a different kind of crazy....
Anyway, 400hp is possible. Just call Greddy and order the whole catalog. Then again there was that aussie/NZ guy that said he ran 22psi of boost with the factory turbo....crazy...

p.s. I almost forgot... you will break stuff.

ROTA_MOTION

i might aswell bolt two 20btt engines together... stuff it lets make it three....lol
i want to go hard and safe but only want to buy things once eg 1 good turbo 1 good ecu ... i need to set the foundations first

HWO

we aren't a different kinda crazy just there are a lot of fools in NZ who think they can do this that and the other thing to a S4 or S5 and still run the factory ecu set up and make 350+HP. Once a month on average there is a wally on here asking similar questions, they have no idea of what BP'ing a turbo involves or how much Moolaa is involved in making the thing run, run reliably, make real HP without spiting the apex seals out the exhuast ports as soon as it comes onto boost. I have sent ROTA MOTION a msg on ICQ as he is already on my ICQ list about and told him to talk to me and i will happily tell him what he can and cannot achieve with the $$$ he is prepared to spend etc etc etc

for what its worth i have a S4 that is currently extended ported, running a Haltech E6K, 4 x 800 cc injectors, a Nissan Skyline GTR fuel pump, FMIC, this that and the other thing done to it. I have another motor ready to go back together with Bridge ported Secondary's and LARGE extended port primaries, with a T04 (part of which i have sitting here), it'll have a pair of GTR pumps feeding it with an extra pair of 550 injectors as well as the 4 x 800's i already have and running 18-20psi with water injection on avgas i'm hoping to put out around 530ish HP in a very safe state of tune

TriTurboGen3 RX-7

Yea i hear you about that brap brap brap sound, i absolutly love it. and with a BP and turbo, You can acually have some high HP down low in the RPM range, instead of after 3k suddenly having tremendous HP gains, The only other way to get that effect is a well set up Nitrous system. If you do go ahead and do a Small BP let us know how it goes, and Post a vid or atleast sounds clip !!! I'm always dying to hear a BP engine, and i would definetly be intrested in doing this also, cuz when i get my 7 my baby will only be out on the weekends and late some nights (for street racing, you know in AR i got to show up the V-8 luvin hicks, they just don't understand power to weight ratio).

HWO....what exactly is a Extended port, i've heard of it, but not been able to find a page describing in detail, Could you LMK ? As far as HP gains with this kind of port, what are the Advantages, Disadvantages over a BP or Street port ?

Thanks

HWO

an extended port is the down under and i believe PROPER name for what the US called a Street port, you's gave it the name 'street port' because its the porting which is "street"-able because its "street"-legal in the US

TriTurboGen3 RX-7

ohh i c, thank you, i've heard that there's not much of a performance increase with a Extended port, is this true, did you notice mmuch of an increase?

Jimmy325i

I have an "extended" port S4 N/A using a ported S5 TII intermediate housing and can honestly tell you that it makes a hell of a difference. I had all my mods done before rebuilding the motor so the only thing that changed was the porting. It was night and day before and after the porting. My motor had a cracked water jacket and pulled strong before the rebuild, but now makes probably another 30-50hp from the porting alone. I can stick with 320hp camaro's off the line through third and do the same with modded eclipses running 15psi.

Now since my stock ecu can't keep up with my little N/A motor, I'm thinking of doing the 6 port turbo conversion.

mazdaspeed7

Any kind of BP motor will eat side seals. They dont exactly last long.