will a 13b-re intake manifold fit an s4
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#10
Rotary Freak
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plate is 3/4" thick and is placed in between the manifolds. yes its used so the manifold runners line up, I also gasket matched the manifolds and ported the adaptor for a nice smooth transition and increased flow
#16
Project P --- Pedospeed
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ya, RE runner/ports are HUGE. im goin with a turbo set up. trying to decide now if a BNR stage 4 is worth the price over stage 3...but that s a whole nother ball game
#19
Banned. I got OWNED!!!
Not to mention I opened up the RE UIM about .125" in some spots to port match it to the RE LIM. When I was done the ports were so big that I had to trim the factory gasket. I didn't open up the LIM ports at all, just smoothed them out a touch.
RE > ALL
RE > ALL
#20
Banned. I got OWNED!!!
& if you've got a 3/4" adapter why the **** wouldn't you countersink some bolts, or use studs in there so you wouldn't have to oval out the mounting. One of the two LIM, S4/5, is off enough on the mounting that it can be done. I've seen it.
BTW - make sure you get dyno plots before and after the REW UIM swap just to make sure you didn't loose any power. Mani's are matched for a reason ya know
BTW - make sure you get dyno plots before and after the REW UIM swap just to make sure you didn't loose any power. Mani's are matched for a reason ya know
#21
yeah, I may see if I can find some tapered head bolts or studs to mount the FD UIM to the S4 LIM. I'm going to try to make it work with a piece of 1/2 inch aluminum. I'm probably going to have it tuned with all the s4 stuff in the spring, but I'll try to dyno it with the FD stuff right after. I'm really not familiar with the process of having a car dyno tuned but I hope I have the time to try both manifolds.
#22
Banned. I got OWNED!!!
I'm not talking about dyno tuning, I'm talking about mis-matching mani's and having it be detrimental to performance. The manifolds are matched for a reason. We know that the REW has balance problems between the front and rear rotors. Under vac one runs lean, but under boost the same one runs rich. The problem is multiplied exponentially as boost/exhaust flow increases. So, by putting the REW UIM on an S4/5 LIM you may be putting that problem on a motor that never had it. In my opinion though the problem lies in the LIM but that's an opinion and there's no fact behind it. Extrude Hone has seen flow differences upto 20% between the front and rear rotors on the REW manis. However, without dual EGT gauges and making a dyno run on the stock mani's, then switching over to the REW UIM on the same day and making a few more pulls and then overlapping the logs for Lambda, EGTS, & power, you won't know anything other than, "Yeah, it's more asteciacally pleasing to have an REW UIM"
#23
I understand that the manifold s were matched for a reason. I also understand that I want to mismatch them for a reason, hopefully more torque due to the longer runners (longer than stock S4).
You say there is a 20% flow difference between front and rear rotors. Hopefully I'll find someone with a flow bench and figure out where that is coming from. Maybe Mazda built the engine like that for a reason, I can't imagine why, but who knows, or maybe someone just F'd up and they rolled with it because it wouldn't, be a problem at stock output power levels.
Its all just bench top racing now but I will test, both manifolds to the best of my capability.
In the end the FD and S4 UIM and throttle body are on par on a performance level, you know what, the FD manifold does look much better at the end of the day.
You say there is a 20% flow difference between front and rear rotors. Hopefully I'll find someone with a flow bench and figure out where that is coming from. Maybe Mazda built the engine like that for a reason, I can't imagine why, but who knows, or maybe someone just F'd up and they rolled with it because it wouldn't, be a problem at stock output power levels.
Its all just bench top racing now but I will test, both manifolds to the best of my capability.
In the end the FD and S4 UIM and throttle body are on par on a performance level, you know what, the FD manifold does look much better at the end of the day.
#24
Banned. I got OWNED!!!
You say there is a 20% flow difference between front and rear rotors. Hopefully I'll find someone with a flow bench and figure out where that is coming from. Maybe Mazda built the engine like that for a reason, I can't imagine why, but who knows, or maybe someone just F'd up and they rolled with it because it wouldn't, be a problem at stock output power levels.
That's what everyone is assuming
I don't know of any real way to trully test the manifolds the way the factory did when they opimized them. But that's why they're the engineers and I'm a finance guy. The only thing that I can think of is a few dyno pulls to see the after effects.