Putting an S5 turbo + manifold on an S4
04-09-12, 06:13 PM
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Putting an S5 turbo + manifold on an S4
i picked up an S5 turbo for my 88 and will be doing a few other upgrades. Will the stock S4 computer suffice or will I need to grab an S5 computer as well?
04-10-12, 12:35 AM
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While it's out, you ought to port both wastegate ports. It can't hurt.
FC3S Pro: Kouki Turbo Wastegate Porting
FC3S Pro: Kouki Turbo Wastegate Porting
04-10-12, 10:45 AM
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i did. I'm going to be sending the turbo out to be rebuilt and upgraded (http://gpopshop.com/). once i have it back i will be pairing it with an rtek stage one and racing beat rev T2 exhaust system.
04-10-12, 11:34 AM
#6
Im running a stock rebuilt s4 tii with the s5 turbo. The wastegate is fine on mine. Im running 3inch rev downpipe with a mix of rb and kniggtsports parts. As well as intake. Ive got no creeping issues. 7.5lbs all day. The s4 was creeping to 12 on me with the waategate ported to the max of the flapper door
04-10-12, 01:58 PM
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Im running a stock rebuilt s4 tii with the s5 turbo. The wastegate is fine on mine. Im running 3inch rev downpipe with a mix of rb and kniggtsports parts. As well as intake. Ive got no creeping issues. 7.5lbs all day. The s4 was creeping to 12 on me with the waategate ported to the max of the flapper door
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04-10-12, 02:50 PM
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^ You can bolt the S4 oil drain to it.
I fully understand that the S5 wastegate ports are superior to the S4 wastegate port. I'm just saying if the turbo is out, why not port the wastegate passages? It's simple, and will put your mind at ease.
Im running a stock rebuilt s4 tii with the s5 turbo. The wastegate is fine on mine. Im running 3inch rev downpipe with a mix of rb and kniggtsports parts. As well as intake. Ive got no creeping issues. 7.5lbs all day. The s4 was creeping to 12 on me with the waategate ported to the max of the flapper door
04-10-12, 03:34 PM
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250 - s5 turbo, haltech, fuel, exhast.
Never ported the wg, only problem I had was with it cracking open in 3rd -5th above 5500rpm. It goes from 11-12psi down to 6psi. I would guess you could get closer to 300 if you put a spring on it to help hold it shut.
Never ported the wg, only problem I had was with it cracking open in 3rd -5th above 5500rpm. It goes from 11-12psi down to 6psi. I would guess you could get closer to 300 if you put a spring on it to help hold it shut.
04-10-12, 03:47 PM
#11
Hmm.... that's interesting. I ported my S5 turbo, shaved the back of the flapper, and verified the wastegate is actuating. I STILL get massive boost creep. I have a 3" downpipe (brand unknown, I bought it used) mated to a 3" resonator (I made it out of a fart can lol) then branches off to 2x 2.125" pipes going to a pair of Pacesetter mufflers (hey, I like the look, ok). I fabricated the whole exhaust myself.
I guess I'm either really good at building exhaust, or I'm terrible at porting wastegates
I guess I'm either really good at building exhaust, or I'm terrible at porting wastegates
04-10-12, 04:23 PM
#12
I get zero boost creep with my S5 hybrid, and it was the same when I had the turbine housing on a stock turbo (3" intake, 2.5" DP). The runners are ported out to 23mm and 26mm (stock is 18mm and 23mm IIRC), and the backplate has had 1/8" of material removed from the inside to allow the door to open further & more volume to pass through.
Yep. The oil drain line just needs to match the front cover on the engine.
Originally Posted by dwb87
^ You can bolt the S4 oil drain to it.
04-12-12, 01:25 AM
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Boost controller will not help it stay shut. The exhaust is pushing harder than what your wg actuator can hold back.
04-12-12, 10:56 AM
#16
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Mazda sized the stock turbo for response, so the stock compressor just barely provides enough air at redline. You need a bigger compressor if you want to hold higher boost all the way to redline.
