more porting/boost creep questions (i know i suck)
12-29-03, 09:08 AM
#1
Yar-Har-Har
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more porting/boost creep questions (i know i suck)
ok... i got my waste gate (s5) ported, but only to the limits of the stock flapper door....
im going to have the full racing beat exhaust with 3in DP, and a 3-2.5in TID ...
wide open
should i consider welding on a larger flapper for the wastegate? i dont really feel like messing with it, but if it makes a huge difference it might be worth it..
also.... garfinkle and i are scheming on porting the exhaust manifold.....not much, but i think on one side it will greatly increase the open volume....
but if i port the exhaust manifold, will i have to port match the actuall engine exhuast ports as well?
has anyone ported the exhaust manifold before? .. and if so how did that turn out?
thanks in advance for any info you guys can provide on the topic...
and yes i searched, but didnt find anything exactly relevant on porting the exhaust manifold
thanks again
im going to have the full racing beat exhaust with 3in DP, and a 3-2.5in TID ...
wide open
should i consider welding on a larger flapper for the wastegate? i dont really feel like messing with it, but if it makes a huge difference it might be worth it..
also.... garfinkle and i are scheming on porting the exhaust manifold.....not much, but i think on one side it will greatly increase the open volume....
but if i port the exhaust manifold, will i have to port match the actuall engine exhuast ports as well?
has anyone ported the exhaust manifold before? .. and if so how did that turn out?
thanks in advance for any info you guys can provide on the topic...
and yes i searched, but didnt find anything exactly relevant on porting the exhaust manifold
thanks again
12-29-03, 01:19 PM
#3
I think with a ported S5 turbo you will be ok. I'm doing the same thing and pretty much I heard that there will still be boost creep but very little.
I'll be doing a 2.5 DP to Corksport 3 inch single with a TID. I hope it doesn't creep bad hehe.
Anyways. What are you doing for fuel? Bigger pump,injectors,etc? I'm hoping I can get away with a Walbro and not upgrading secondaries.
I'll be doing a 2.5 DP to Corksport 3 inch single with a TID. I hope it doesn't creep bad hehe.
Anyways. What are you doing for fuel? Bigger pump,injectors,etc? I'm hoping I can get away with a Walbro and not upgrading secondaries.
12-29-03, 01:46 PM
#4
Yar-Har-Har
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fuel is going to be my main problem
im not gonna be able to do anything right now...which means i need to keep my *** outta boost....
im not going to boost more than like 7 psi though, so i should be fine...
the next round of upgrades will be fuel (shortly after the car is actually running)..
im going with a rewired walbro for starters , and then im getting an safc with bigger secondaries (720s most likely)
surely that will take care of my fuel needs.....hopefully i dont blow the engine before i begin those fuel upgrades
i dont think i will blow it though....just as long as i keep my boost under 8 psi i should be good....
anymore info specifically about porting the exhaust manifold and if that will require port matching to the actuall engine?
im not gonna be able to do anything right now...which means i need to keep my *** outta boost....
im not going to boost more than like 7 psi though, so i should be fine...
the next round of upgrades will be fuel (shortly after the car is actually running)..
im going with a rewired walbro for starters , and then im getting an safc with bigger secondaries (720s most likely)
surely that will take care of my fuel needs.....hopefully i dont blow the engine before i begin those fuel upgrades
i dont think i will blow it though....just as long as i keep my boost under 8 psi i should be good....
anymore info specifically about porting the exhaust manifold and if that will require port matching to the actuall engine?
12-29-03, 03:02 PM
#5
Compression Tester Guy
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Check out RETed's page on porting an S5 wastegate. http://fc3spro.com/TECH/HOWTO/KWG/kwg.html
12-29-03, 03:20 PM
#6
Yar-Har-Har
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ok....way to read the original post...
i dont understand why you posted a link to porting a wastegate, when the original post i made says very simply ::
"ok... i got my waste gate (s5) ported, but only to the limits of the stock flapper door...."
thanks for taking time to post, but it seems as though you have completely wasted your time, and finger strength in typing that
i dont understand why you posted a link to porting a wastegate, when the original post i made says very simply ::
"ok... i got my waste gate (s5) ported, but only to the limits of the stock flapper door...."
thanks for taking time to post, but it seems as though you have completely wasted your time, and finger strength in typing that
12-29-03, 03:26 PM
#7
Compression Tester Guy
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Hey, you asked if you would be ok porting it only to the size of the stock flapper. Ted's site shows that it will be fine even with a wide open exhaust. How about you stop wasting my time, stop being a smart ***, and read the page.
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12-29-03, 03:30 PM
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Originally posted by TwistedRotors
. http://fc3spro.com/TECH/HOWTO/KWG/kwg.html
The 1989-1991 Kouki FC3S turbo wastegate design is superior to the earlier 1986-1988 FC3S Zenki turbo wastegate design. The Kouki wastegate had two holes that allowed exhaust gases to bypass both turbine passages within the "independent twin scroll" turbo. In contrast, the Zenki turbo wastegate only bleeds exhaust gases from one passage of it's "twin scroll" turbo - this inferior design will produce boost creep from freer flowing exhaust systems! Boost creep is BAD. Below is a desciption of how we port the Kouki wastegate passages to promote better boost control by the wastegate system.
. http://fc3spro.com/TECH/HOWTO/KWG/kwg.html
The 1989-1991 Kouki FC3S turbo wastegate design is superior to the earlier 1986-1988 FC3S Zenki turbo wastegate design. The Kouki wastegate had two holes that allowed exhaust gases to bypass both turbine passages within the "independent twin scroll" turbo. In contrast, the Zenki turbo wastegate only bleeds exhaust gases from one passage of it's "twin scroll" turbo - this inferior design will produce boost creep from freer flowing exhaust systems! Boost creep is BAD. Below is a desciption of how we port the Kouki wastegate passages to promote better boost control by the wastegate system.
does this mean that the boost creep is even worse on s4 turbo's?
12-29-03, 03:31 PM
#9
Yar-Har-Har
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Hey, you asked if you would be ok porting it only to the size of the stock flapper. Ted's site shows that it will be fine even with a wide open exhaust. How about you stop wasting my time, stop being a smart ***, and read the page.
ughh...........
we ported the wastegate using that page, so ive read everything on it....that wasnt my ONLY question, which is the only reason ive bumped this thread up....to get the OTHER questions answered...
AGAIN ... i appreciate your response but it was mute..... and has already been answered....so quit taking so much offense, and trying to act cool....
on a lighter note...... ill stab your dog!
Last edited by Fitness Stain; 12-29-03 at 03:33 PM.
12-29-03, 03:32 PM
#10
Yar-Har-Har
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Originally posted by S13 Slide
Check out RETed's page on porting an S5 wastegate
does this mean that the boost creep is even worse on s4 turbo's?
Check out RETed's page on porting an S5 wastegate
does this mean that the boost creep is even worse on s4 turbo's?
thats what i assume, although im sure someone knows on here for sure...
ive ditched my s4 turbo due to its inferrior design...
series 5 all the way baby!!
12-29-03, 03:32 PM
#11
Compression Tester Guy
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Yes S4's creep worse. I still hit boost creep (cold days, RB exhaust, stock intake) with my wastegate ported as big as I could get it. www.twistedrotors.com/fc/wastegate.html
12-29-03, 03:36 PM
#12
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Fitness, if you followed that page then why did you ask the question and then act like a dick when someone answered? I realized that your question was already answered, but I posted Ted's page as a backup. Interpreting someones response on these forums is difficult to do, you've got to be careful otherwise you **** someone off who was just trying to be helpful.
I don't know about porting the exhaust mainfold and have no information on it so I didn't say anything about.
I don't know about porting the exhaust mainfold and have no information on it so I didn't say anything about.
12-29-03, 03:38 PM
#14
Yar-Har-Har
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Originally posted by TwistedRotors
Fitness, if you followed that page then why did you ask the question and then act like a dick when someone answered? I realized that your question was already answered, but I posted Ted's page as a backup. Interpreting someones response on these forums is difficult to do, you've got to be careful otherwise you **** someone off who was just trying to be helpful.
I don't know about porting the exhaust mainfold and have no information on it so I didn't say anything about.
Fitness, if you followed that page then why did you ask the question and then act like a dick when someone answered? I realized that your question was already answered, but I posted Ted's page as a backup. Interpreting someones response on these forums is difficult to do, you've got to be careful otherwise you **** someone off who was just trying to be helpful.
I don't know about porting the exhaust mainfold and have no information on it so I didn't say anything about.
your right....my bad....i just hate it when people post info in a thread that has already been posted in one way or another.....you were just adding backup, and i understand that.....
your dog is still still getting stabbed though
jk
12-29-03, 03:39 PM
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Originally posted by NZConvertible
Given how rare the twin wastegate design is, I think you'd have trouble finding a larger replacement flap. You should be OK with what you've got.
Given how rare the twin wastegate design is, I think you'd have trouble finding a larger replacement flap. You should be OK with what you've got.
cool...thanks NZ...
has anyone ported the exhaust manifold before?
12-29-03, 03:58 PM
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dustin, you will be fine with how you ported it, I dont think that you will run more than 8-9 psi like that. I would bet money on it, it looked good from what i saw.
a walbro pump rewired will be (should be) enough fuel to maintain proper a/f and if that gives you any problem you can get a regulator and some 680 first gen injectors cheap, and youll have more than enough fuel and shoot nice ***** of fire. All i had on my car was a 3rdgen pump rewired and my egt temps stayed where they were supposed to be and my a/f was well in the clear.
porting your mani will have minor effects as the design already somewhat limits what you can do to it. You can go in and open it up some but only minimal like i said. Just match it to the gasket (mani only) and you'll be fine, if you try porting the block itself out to match the gasket your prob gonna get shavings all in the motor, and haha thats no good.
-Chris
a walbro pump rewired will be (should be) enough fuel to maintain proper a/f and if that gives you any problem you can get a regulator and some 680 first gen injectors cheap, and youll have more than enough fuel and shoot nice ***** of fire. All i had on my car was a 3rdgen pump rewired and my egt temps stayed where they were supposed to be and my a/f was well in the clear.
porting your mani will have minor effects as the design already somewhat limits what you can do to it. You can go in and open it up some but only minimal like i said. Just match it to the gasket (mani only) and you'll be fine, if you try porting the block itself out to match the gasket your prob gonna get shavings all in the motor, and haha thats no good.
-Chris
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