E99: Yet Another S300 SX-E Thread
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Laughing Gas
Joined: Mar 2021
Posts: 1,118
Likes: 425
Did any of these folks have an SXE? I guess the common thing I see with folks who have gone the SXE route around here is that EGTs are rendered a non issue for all but the most extreme situations.
Lead Driver
Joined: Jul 2017
Posts: 6,861
Likes: 2,335
From: WV
Sure, you would be likely to catch it by feel but I like to know how hot it’s running.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
What RJWV said is the best reason. It only takes a small drive pressure or boost leak to throw your world out of whack. You can easily send EGT through the roof without knowing it.
Never knowing in the first place is like flying blindfolded. Believe me, there are ‘popular’ tuners out there putting out some really, really bad stuff. With no baseline, you could do damage before ya know it.
on edit: it’s unlikely you will ever hurt anything with stock tuning.
Lead Driver
Joined: Jul 2017
Posts: 6,861
Likes: 2,335
From: WV
To go along with that there’s really no reason for a boost gauge at all except for monitoring a baseline to know when something is not right.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
On that same topic, there is an argument against large diameter exhaust that says too big allows the gasses to cool and cool gasses don’t flow as well as warm gasses. This gets into laminar flow, etc. Plus, once you get serious about going fast, weight becomes a significant factor.
Lead Driver
Joined: Jul 2017
Posts: 6,861
Likes: 2,335
From: WV
In the gas naturally aspirated world, exhaust velocity comes into play with scavenging the cylinders and actually helping to pull in the intake charge.
Cargo Master
Joined: Mar 2019
Posts: 2,907
Likes: 788
From: Kinnula,Finland
Yes,i have always thinked that turbos hot side needs all possible heat.
Everything is wrapped up in racing etc.
But would turbine be even more efficient beyond melting point of pistons?
I would say yes,because ceramic piston coating etc.
What is redline temp for typical cast turbine housing and inconel turbine?(too lazy to search If someone has the data)
Everything is wrapped up in racing etc.
But would turbine be even more efficient beyond melting point of pistons?
I would say yes,because ceramic piston coating etc.
What is redline temp for typical cast turbine housing and inconel turbine?(too lazy to search If someone has the data)
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Laughing Gas
Joined: Mar 2021
Posts: 1,118
Likes: 425
Still having a sealing issue on my driver side up-pipe, even after tightening the bolts (which seem to be deforming). FYI I sanded the sealing surface prior to connecting the up pipes.
Have to say I'm a little disappointed with the connecting block piece irate used in this kit. As you can see in the picture this one is bending from the pressure of the bolts. The block on the stock up pipes is much thicker/heavier, and the ridge that presses against the up-pipe flange has a chamfer to match the flange, distributing the clamping pressure... This one doesn't have that. Additionally the supplied bolts are weaker as they are fully threaded compared to the stock ones.
Not sure how much boost I'm loosing from this leak. Aside from trying to sand the manifold more I'm not sure how I can address this. I could try and fashion a copper ring* to sandwich between the manifold and up-pipe. I could also apply some JB Weld 1800° exhaust sealant.
Suggestions are appreciated. I have no idea how "bad" this leak is... If y'all think it's not too bad, I'll wait to address it until the transmission is out when I'll have much easier access.
*Does anyone have the ID/OD of the exhaust manifold ball joint/up-pipe mating surface?
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
It looks like you could do a better job centering the up-pipe on the manifold. Try loosening the side that is too close and then tightening the other side. Ultimately, we’d like to see the same amount of thread past each nut...
Yes, even a tiny leak like this HURTS performance. I would address this sooner or later. This is the type of thing that can happen over time and increased EGT may be your first indication.
Yes, even a tiny leak like this HURTS performance. I would address this sooner or later. This is the type of thing that can happen over time and increased EGT may be your first indication.
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
I don’t see any kind of gasket ever surviving that environment....
If gasket/sealant failure provides an opportunity to send shrapnel into 1200* turbine wheel spinning at 50k rpm’s, then it’s reallllly a bad idea.
If gasket/sealant failure provides an opportunity to send shrapnel into 1200* turbine wheel spinning at 50k rpm’s, then it’s reallllly a bad idea.