bridgy

bigtony08 · 03-30-2009, 06:43 AM

hey guys im about to pick up another s5 6port engine for rebuild and i want to do a bridge port. who offers templets or does any one offer this service?

drewski86 · 03-30-2009, 09:24 AM

The general consensus is that 6ports and bridges don't work too well. If you are going to do it, don't take the bridge higher than the stock secondary closing as it is already extremely late, leave support in the middle of the bridge from the section between 5th and 6th ports, and don't plan on using the stock intake manifold.

bigtony08 · 03-30-2009, 01:59 PM

damn sound like alot of work would i be better off going PP?

vex · 03-30-2009, 02:07 PM

Quote:

Originally Posted by bigtony08

damn sound like alot of work would i be better off going PP?

...How familiar are you with porting?

For a P-Port you have to drill it out though the housing and cr plating. Install the actual ports either by welding it in, or having a machinist drill, tap, and die the different portions (I highly doubt you have a tap and die that big). Once installed you have to fill it with epoxy and have it lapped to tolerances. Then you have to fill in the stock irons.

If you can't do a Bridge port I would not suggest attempting to do a P-Port. However, you do have a few options: 1) Check racing beat and get one of their pre-made P-Port housings, this will remove a majority of the difficult work and leave you to fill in the side housings with Dev-Con. 2) Get in contact with mazda and get factory made P-Ports that are actually cast that way. 3) Buy Aluminum side irons and get in touch with RB about not having ports put in, thus eliminating your need to put the dev con in.

Another option would be just to get a Large street port and call it a day. That's what I have done with my 6-PI Turbo, and I should be good for quite a good deal of HP/TRQ

bigtony08 · 03-30-2009, 02:15 PM

with a pp i was going to go with the rb housings and fill in the irons.

drewski86 · 03-30-2009, 06:18 PM

Quote:

Originally Posted by bigtony08

damn sound like alot of work would i be better off going PP?

Or you could use a turbo motor (4 port) with NA internals.

What are you planning on using the car for? Is this going to be a toy, or do you plan on racing in a class? Is this car going to see street time? You may or may not have asked yourself these questions, but we can give you better advise if we know the answers to these.

bigtony08 · 03-30-2009, 09:20 PM

going to be a toy. basicaly something i can drive to and from autocross. im about to pick up a vette as a DD so i want to turn the rx into a track car

WE3RX7 · 03-30-2009, 09:53 PM

For auto-x, I'd just go large SP. BP and PP won't have that low end grunt you'll need to come out of slow/tight turns....

***TitaniumTT*** · 03-30-2009, 10:31 PM

Meh, not so much. Properly built P-Ports can run high enough in the RPM band that when you shift, you're still high enough. At the local auto-x where I was a regular MANY years ago, the guy that got the most FTD's was a 13B P-port in an FB (of all things) He would rev the SNOT out of that motor.

Regardless though, if you're going to go bridge-port, the factory intake won't be tuned properly anymore so in that regard, yeah a p-port would make more sense. Driving it to and from the track though..... I dunno about that. Although the FB guy did ever single weekend he was at some event.

Some food for thought, take it as you will, don't forget prices when you see these numbers
Stock S5 160 BHP
Friends S5 with Rtek, and RB full dual exhaust - ~175 RWHP
Bridges........ generally not much more
I haven't seen the dyno sheet for an FI P-port, but my EMS guy claims - 380BHP (on methanol)

bigtony08 · 03-31-2009, 06:23 AM

i was going to go carb'd with a pp setup, little bit easier to tune

drewski86 · 03-31-2009, 10:38 AM

Quote:

Originally Posted by WE3RX7

For auto-x, I'd just go large SP. BP and PP won't have that low end grunt you'll need to come out of slow/tight turns....

Not quite. Bridges and PPorts make more power everywhere other than low rpm AND light throttle which you should never see while racing.

I dont know how serious you are but you will end up in the Prepared class where PPorts have a slight weight penalty. If you're not going to fully strip the car then it wont be a big issue. I would say go for the PP if you have the means.

bigtony08 · 03-31-2009, 07:47 PM

idk i really want to get into drifing and drift nirvana is held at least one week end a month right here in good ol West by GOD Virginia. ye haw

djmtsu · 03-31-2009, 07:57 PM

If you want to get into drifting....stop.

Use the vert as a daily driver, and get a old S4 coupe to destroy.

Please, save the Verts!!

bigtony08 · 03-31-2009, 07:59 PM

lol well point me to a old cheep one and ill be on that like stink on s***

djmtsu · 03-31-2009, 08:12 PM

Craigslist is your friend!

They pop alot for under 1K. You can usually find a S4 GXL for cheap, and most have LSD stock. So it makes a good base!

03-30-2009, 06:43 AM	#1
bigtony08 obsessed rotard Join Date: Jan 2009 iTrader: (0) Posts: 249 Rep Power: 16	bridgy hey guys im about to pick up another s5 6port engine for rebuild and i want to do a bridge port. who offers templets or does any one offer this service?

03-31-2009, 07:57 PM	#13
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	If you want to get into drifting....stop. Use the vert as a daily driver, and get a old S4 coupe to destroy. Please, save the Verts!! __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

03-31-2009, 08:12 PM	#15
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (10) Posts: 4,043 Rep Power: 21	Craigslist is your friend! They pop alot for under 1K. You can usually find a S4 GXL for cheap, and most have LSD stock. So it makes a good base! __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

03-30-2009, 09:24 AM	#2
drewski86 Slow Join Date: Jun 2008 iTrader: (0) Posts: 38 Rep Power: 0	The general consensus is that 6ports and bridges don't work too well. If you are going to do it, don't take the bridge higher than the stock secondary closing as it is already extremely late, leave support in the middle of the bridge from the section between 5th and 6th ports, and don't plan on using the stock intake manifold.

03-30-2009, 01:59 PM	#3
bigtony08 obsessed rotard Join Date: Jan 2009 iTrader: (0) Posts: 249 Rep Power: 16	damn sound like alot of work would i be better off going PP?

03-30-2009, 02:15 PM	#5
bigtony08 obsessed rotard Join Date: Jan 2009 iTrader: (0) Posts: 249 Rep Power: 16	with a pp i was going to go with the rb housings and fill in the irons.

03-30-2009, 09:20 PM	#7
bigtony08 obsessed rotard Join Date: Jan 2009 iTrader: (0) Posts: 249 Rep Power: 16	going to be a toy. basicaly something i can drive to and from autocross. im about to pick up a vette as a DD so i want to turn the rx into a track car

03-30-2009, 09:53 PM	#8
WE3RX7 RCC Addict Join Date: Feb 2008 Location: VA iTrader: (1) Posts: 1,812 Rep Power: 18	For auto-x, I'd just go large SP. BP and PP won't have that low end grunt you'll need to come out of slow/tight turns....

03-30-2009, 10:31 PM	#9
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	Meh, not so much. Properly built P-Ports can run high enough in the RPM band that when you shift, you're still high enough. At the local auto-x where I was a regular MANY years ago, the guy that got the most FTD's was a 13B P-port in an FB (of all things) He would rev the SNOT out of that motor. Regardless though, if you're going to go bridge-port, the factory intake won't be tuned properly anymore so in that regard, yeah a p-port would make more sense. Driving it to and from the track though..... I dunno about that. Although the FB guy did ever single weekend he was at some event. Some food for thought, take it as you will, don't forget prices when you see these numbers Stock S5 160 BHP Friends S5 with Rtek, and RB full dual exhaust - ~175 RWHP Bridges........ generally not much more I haven't seen the dyno sheet for an FI P-port, but my EMS guy claims - 380BHP (on methanol)

03-31-2009, 06:23 AM	#10
bigtony08 obsessed rotard Join Date: Jan 2009 iTrader: (0) Posts: 249 Rep Power: 16	i was going to go carb'd with a pp setup, little bit easier to tune

03-31-2009, 07:47 PM	#12
bigtony08 obsessed rotard Join Date: Jan 2009 iTrader: (0) Posts: 249 Rep Power: 16	idk i really want to get into drifing and drift nirvana is held at least one week end a month right here in good ol West by GOD Virginia. ye haw

03-31-2009, 07:59 PM	#14
bigtony08 obsessed rotard Join Date: Jan 2009 iTrader: (0) Posts: 249 Rep Power: 16	lol well point me to a old cheep one and ill be on that like stink on s***