Bridgeport RX8
06-29-2009, 12:51 AM
#226
My solution as follows:
1. I only bridged the front and rear plates which means that the housings are only chamfered where they meet the front and rear plate.
2. I installed the apex seals for the rear rotor with the wedge towards the center plate which has no bridge...
(yes it was a PITA but its doable...)
This way I was able to go with substantial bridge and "eyebrow" without worry of the apex seal getting caught or the bridge being to thin because of attempting to keep the housing untouched...
its like the best of both worlds..
Chris...
p.s....she runs....
1. I only bridged the front and rear plates which means that the housings are only chamfered where they meet the front and rear plate.
2. I installed the apex seals for the rear rotor with the wedge towards the center plate which has no bridge...
(yes it was a PITA but its doable...)This way I was able to go with substantial bridge and "eyebrow" without worry of the apex seal getting caught or the bridge being to thin because of attempting to keep the housing untouched...
its like the best of both worlds..
Chris...
p.s....she runs....
This is what I was hoping to hear. Keep us posted Chris. I have a couple of plates lying around here I would love to do this to. Thanks.
06-30-2009, 08:29 AM
#227
Wow....
I was finally able to get her to idle and not shut off yesterday....and with no fuel leaks
.
The engine needs air....so much air....My idle bypass valve(custom made for the new manifold) couldn't hold idle even all the way open....I had to drill a small hole in the throttle body butterfly to get it to idle and man!....can you hear the Brap Brap Brap!...it is very defined...specially with a 4" exhaust. The reason the idle is an issue is not that the porting is too extreme. It is simply due to the fact that the OEM computer still controls the throttle body and it is always trying to idle the car at 800rpm....this is fine normally but "bridgeys" like to idle between 1100 and 1300. I have mine set at 1200 and its perfect.
oh....and the vacuum is at like 10hg...haha...on a new rebuild!...this is common for bridgeported engine.
I can tell that the air demands for the engine have changed. This will require a completely new tune. My friend was there and he took a very short video which I should have later so I will post it here. Now I am waiting for a front bearing so I can put my wheels back on...and then I can start to do some street tuning.
These are very exciting times!
Chris
I was finally able to get her to idle and not shut off yesterday....and with no fuel leaks
.The engine needs air....so much air....My idle bypass valve(custom made for the new manifold) couldn't hold idle even all the way open....I had to drill a small hole in the throttle body butterfly to get it to idle and man!....can you hear the Brap Brap Brap!...it is very defined...specially with a 4" exhaust
. The reason the idle is an issue is not that the porting is too extreme. It is simply due to the fact that the OEM computer still controls the throttle body and it is always trying to idle the car at 800rpm....this is fine normally but "bridgeys" like to idle between 1100 and 1300. I have mine set at 1200 and its perfect.oh....and the vacuum is at like 10hg...haha...on a new rebuild!...this is common for bridgeported engine.
I can tell that the air demands for the engine have changed. This will require a completely new tune. My friend was there and he took a very short video which I should have later so I will post it here. Now I am waiting for a front bearing so I can put my wheels back on...and then I can start to do some street tuning.
These are very exciting times!
Chris
06-30-2009, 11:39 AM
#229
Wow....
I was finally able to get her to idle and not shut off yesterday....and with no fuel leaks.
The engine needs air....so much air....My idle bypass valve(custom made for the new manifold) couldn't hold idle even all the way open....I had to drill a small hole in the throttle body butterfly to get it to idle and man!....can you hear the Brap Brap Brap!...it is very defined...specially with a 4" exhaust. The reason the idle is an issue is not that the porting is too extreme. It is simply due to the fact that the OEM computer still controls the throttle body and it is always trying to idle the car at 800rpm....this is fine normally but "bridgeys" like to idle between 1100 and 1300. I have mine set at 1200 and its perfect.
oh....and the vacuum is at like 10hg...haha...on a new rebuild!...this is common for bridgeported engine.
I can tell that the air demands for the engine have changed. This will require a completely new tune. My friend was there and he took a very short video which I should have later so I will post it here. Now I am waiting for a front bearing so I can put my wheels back on...and then I can start to do some street tuning.
These are very exciting times!
Chris
I was finally able to get her to idle and not shut off yesterday....and with no fuel leaks
.The engine needs air....so much air....My idle bypass valve(custom made for the new manifold) couldn't hold idle even all the way open....I had to drill a small hole in the throttle body butterfly to get it to idle and man!....can you hear the Brap Brap Brap!...it is very defined...specially with a 4" exhaust
. The reason the idle is an issue is not that the porting is too extreme. It is simply due to the fact that the OEM computer still controls the throttle body and it is always trying to idle the car at 800rpm....this is fine normally but "bridgeys" like to idle between 1100 and 1300. I have mine set at 1200 and its perfect.oh....and the vacuum is at like 10hg...haha...on a new rebuild!...this is common for bridgeported engine.
I can tell that the air demands for the engine have changed. This will require a completely new tune. My friend was there and he took a very short video which I should have later so I will post it here. Now I am waiting for a front bearing so I can put my wheels back on...and then I can start to do some street tuning.
These are very exciting times!
Chris
06-30-2009, 11:54 AM
#230
I am sure you could force it to idle between 900-1000rpm...but I am not even going to try to get it that low. It looses the consistent brap and starts sounding eratic with braps in between at 1000rpm and lower.
Bridgeports are meant to idle above 1000rpm, you know this and accept it when you decide to go bridge...I am sure you can force it to go lower but what is the point? It wont be any quieter, it wont affect anything to idle above 1000wpm and it wont have the signature sound...so other that the mental issue of knowing the idle is above 1000rpm there is no reason to try it any lower. If the idle being 300rpm higher is an issue then don't go bridgeport.
Its kinda saying you want 400whp and you want the car to be as quiet as stock....or that you want a turbo but you don't want to be able to hear the whine/whistle of one...see what I am saying?
Chris
Bridgeports are meant to idle above 1000rpm, you know this and accept it when you decide to go bridge...I am sure you can force it to go lower but what is the point? It wont be any quieter, it wont affect anything to idle above 1000wpm and it wont have the signature sound...so other that the mental issue of knowing the idle is above 1000rpm there is no reason to try it any lower. If the idle being 300rpm higher is an issue then don't go bridgeport.
Its kinda saying you want 400whp and you want the car to be as quiet as stock....or that you want a turbo but you don't want to be able to hear the whine/whistle of one...see what I am saying?
Chris
Last edited by ChrisRX8PR; 06-30-2009 at 11:57 AM.
06-30-2009, 06:47 PM
#233
Administrator
iTrader: (7)
just read the whole thread, very exciting stuff. Can't wait to see where this goes...
Chris: grats on getting the car running, keep us posted
Chris: grats on getting the car running, keep us posted
06-30-2009, 06:58 PM
#235
Administrator
iTrader: (7)
can you control that with a flash tune? (Hymee Pro Tuner, AP, etc)
06-30-2009, 10:50 PM
#236
I do not know. It would suck to have to get a tuner just with the purpose of setting the idle. Currently what I made works...but the throttle still closes a bit every 30sec or so to try and bring the idle down to stock...but it just goes down to 1000rpm momentarily before it goes back up to what I set it at...its annoying sometimes but its livable.
Maybe someone local can "lend" me a tuner so I can set up the idle to 1200...
Any volunteers?
Chris
Maybe someone local can "lend" me a tuner so I can set up the idle to 1200...
Any volunteers?
Chris
Last edited by ChrisRX8PR; 06-30-2009 at 10:53 PM.
06-30-2009, 11:18 PM
#237
BDC Motorsports
I still think ya oughta try sticking a small resistor in the TPS 5V output signal lead to fool the ECU into thinking you're still on the throttle when you're off. It'll disable the idle functions.
B
B
07-01-2009, 03:01 AM
#238
Hmmmm, I would think that since you don't have the OE upper intake manifold the secondary ports being open at idle is the issue. This won't be the case and possibly less of an issue for those with the OE upper manifold. 
Wow....
I was finally able to get her to idle and not shut off yesterday....and with no fuel leaks.
The engine needs air....so much air....My idle bypass valve(custom made for the new manifold) couldn't hold idle even all the way open....I had to drill a small hole in the throttle body butterfly to get it to idle and man!....can you hear the Brap Brap Brap!...it is very defined...specially with a 4" exhaust. The reason the idle is an issue is not that the porting is too extreme. It is simply due to the fact that the OEM computer still controls the throttle body and it is always trying to idle the car at 800rpm....this is fine normally but "bridgeys" like to idle between 1100 and 1300. I have mine set at 1200 and its perfect.
Chris
I was finally able to get her to idle and not shut off yesterday....and with no fuel leaks
.The engine needs air....so much air....My idle bypass valve(custom made for the new manifold) couldn't hold idle even all the way open....I had to drill a small hole in the throttle body butterfly to get it to idle and man!....can you hear the Brap Brap Brap!...it is very defined...specially with a 4" exhaust
. The reason the idle is an issue is not that the porting is too extreme. It is simply due to the fact that the OEM computer still controls the throttle body and it is always trying to idle the car at 800rpm....this is fine normally but "bridgeys" like to idle between 1100 and 1300. I have mine set at 1200 and its perfect.Chris
07-01-2009, 06:08 AM
#239
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07-01-2009, 08:31 AM
#241
This was happening to me even before when I had the stock manifold because I was also trying to hold the idle at 1000rpm instead of 800. The change in manifold didn't make a difference.
Chris
07-01-2009, 10:40 AM
#247
Chris
07-01-2009, 10:48 AM
#248
My turbo piping/Maf location do not allow the use of a flash tuner, I am moving 3 or more times the amount of air the stock engine moves....it would be complementary but I would not replace the stand alone for a tuner ever...half my sensors/solenoids aren't even there anymore.
Chris
Chris
