bosozo9

iTrader: (5)

well i'm finally getting around to put my car together and wanted the lists input on HP numbers on either a half-bridge or a streetport. with this setup.

2 x td06-19c
13bt s5 w/oversized engine studs
microtech lx-12
injectors 4x7200, 2x1600
aftermarket inline and intank pump.
hks intercooler

because i haven't ever seen anyone else with this twin turbo configuration i can't make a solid decision. i think its an old greddy turbo kit? i haven't really decided on what port to use but if there is a big difference between a street and a half bridge i rather go with the half-bridge
thanks in advance
mike

MazdaRx7Racer4Life

will your twin setup be sequential or parallel?

bosozo9

iTrader: (5)

the turbo configuration will be parallel. do u think i'll have a lot of lag?

MazdaRx7Racer4Life

fastrotaries

good luck fabbing up that twin setup, it should be fun.

MazdaRx7Racer4Life

Definitely, that is about the same turbo setup as my brother's 300zx has. Evem=n though they are pretty laggy when those turbos kick in it feels like you are going to rip thorugh the back of your seat, no matter what gear your in.

bosozo9

iTrader: (5)

i think its a old greddy turbo kit and the turbos sit almost on top of each other like the crazy twin turbo fc's in the japanese magazines. all the fabbs are done i just need to weld up a downpipe.

bosozo9

iTrader: (5)

but what do you guys think about the hp difference between a half-bridge and a streetport would be?

razorback

well a half bridge allows more air to flow to you will gain considerable hp (no idea how much each motor is different as is the porting type, need a dyno for that) your turbos will also spool alot quicker. and if they are too small then they may choke your motor. which is why huge turbos on a half bridge is very very common.

do you happen to have any pictures of this set up? it sounds kinda interesting. but there are several forum members that do half bridges and maybe they will stop by and give you some help.

bosozo9

iTrader: (5)

everything is in pieces i still have do the bridgeport if i go that route. the streetport is already done. it sounds as if i will go ahead and do the half-bridgeport. i'll order the templates from racingbeat. also on the porting of the exhaust. i totally forgot do i port only the top or the bottom if i go the half-bridge route.
thanks
mike

bosozo9

iTrader: (5)

http://www.nopistons.com/forums/inde...howtopic=46073


here is a link to the pics of the turbo set-up.... i couldn't post them here cuz the files are too big... what do you guys think? what kinda hp number can i expect at 15 psi with a bdc style half-bridge or a streetport? with a half-bridge what can i expect the powerband to be?

thanks
mike

91mazdarx7

sorry to hiyjack your thread but could anyone help me out with a question of my own i am going to be rebuilding a t2 engine and i want to make 400-450 rwhp what port would be better a bridge port or a large street port whats the difference would i loose bottom end with the bigger the port i get can anyone help me

ultradef

I would try posting this at www.teamfc3s.org if you haven't already. BDC posts pretty regularly over there. Since he is famous for his half bridges, I assume he would have a good idea of the power difference between a half-bridge and a street port.

OverDriven

With a larger port you will have port overlap. The result is that you will lose power down low, and gain a considerable amount over 5000 RPM. BTW...450 RWHP is very possible in an FC, but man you will probably **** yourself when you hit the gas.


-Joe

eViLRotor

iTrader: (2)

Apparently, with a correctly sized turbo, a Half BP, and even a full bridge can give you almost as much low/mid range as a large streetport. Then you also have the added benifit of way more top end.

91mazdarx7

so what kind of port would be best for me for a 450rwhp a half bridgeport or a bridgeport also when i get the porting done are you saying that if i get a really big turbo i would lose low end power still but not as much as if i used a littler turbo

eViLRotor

iTrader: (2)

What is being said, is that with a BP and a correctly sized large turbo, you can get almost the same low end as with a SP and smaller turbo...

For 450rwhp I would go 1/2 BP. Just because I'd like the added reliability over a full BP.

Read this post by Maxthe7man: http://www.nopistons.com/forums/inde...ic=45444&st=25

91mazdarx7

damn that is some complicated stuff from what i got i think i should go with a half bridge port and a large turbo that way i wont really have to worry about it losing low end power and keep it less confusing because it will be a everyday driver with the weekend use on the tracks am i on the right track as to what is better for me?