Turbo crossover and waste gate question
07-30-2018, 12:36 AM
#2
Question. So is it a must to run a flex in my crossover? I have a v band on one side and a factory ball joint style flange on the other side. I figure the ball joint would let it move. Also I saw where someone had their wastegate in the crossover, does that work well, just exhausting from one side? Or maybe it I have problems controlling boost I can install two and have the second on on the crossover.
07-30-2018, 06:59 AM
#4
TECH Regular
Save the hassle put a flex in it it's cheap insurance that one u take it off it will go back on. The Watergate can go anywhere so long as it is in a spot where air would flow out easily usually near a bend works best if it's not possible then make sure to use as big as u can or 2 smaller ones u just want to get rid of unneeded exhaust pressure
07-30-2018, 08:11 AM
#6
Ok well the flex I have I don’t think it’s got a solid inner liner. Good to know in the waste gate. Thx. I think I may chance it on the crossover. I can always add it later. Save me the expense right now (which I know ain’t much) and the additional work. Thanks guys.
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07-31-2018, 09:02 AM
#9
Restricted User
I've never ran a flex, and never had any problems. If the turbo is being supported by anything other than the engine, then its a must. If its hard mounted a manifold, there are more reasons not to run one than to run one.
07-31-2018, 09:21 AM
#10
that’s good to know. I like less complications, less money spent and less points for failure. My turbo is on the manifold, I used .120 wall pipe so it should be supported well, however, the over doer I am, I’m going to put a support bracket from the turbo to the head just in case. Hopefully that will be extra insurance against cracking.
08-01-2018, 12:07 PM
#11
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flex is ideal in the crossover to allow for expansion and movement of the engine during dynamic operation.
wastegate in the cross over is perfect for when the turbine or non turbo side manifold poses a big flow restriction. dumping unwanted exhaust manifold pressure or drive pressure (when its beyond the rule of thumb ratio to boost) will stop a combo choking at high rpm and boost. a combo pushed beyond the limits of turbine flow will cause excessive back pressure on the engine as it cant evacuate the exhaust gases. bear in mind boost goes in and is mixed with fuel, its burnt and then exhausted. as a hot burnt gas its a greater volume than it was before combustion and requires more area to flow post combustion.
for boost control however the gate is best placed in a flow receiving position at the turbo flange or on the turbine housing.
wastegate in the cross over is perfect for when the turbine or non turbo side manifold poses a big flow restriction. dumping unwanted exhaust manifold pressure or drive pressure (when its beyond the rule of thumb ratio to boost) will stop a combo choking at high rpm and boost. a combo pushed beyond the limits of turbine flow will cause excessive back pressure on the engine as it cant evacuate the exhaust gases. bear in mind boost goes in and is mixed with fuel, its burnt and then exhausted. as a hot burnt gas its a greater volume than it was before combustion and requires more area to flow post combustion.
for boost control however the gate is best placed in a flow receiving position at the turbo flange or on the turbine housing.
08-06-2018, 08:01 AM
#13
08-06-2018, 08:53 PM
#15
I wont be using any bellows, haha
Hahaha, hey, I weld in flip flips too.
08-06-2018, 09:55 PM
#16
Restricted User
If your crossover is directly between manifolds like is common in KB/Trick/Dirty Dingo and now Holley style manifolds, you're basically just merging 2 solid mounted manifolds together. No flex is needed.
There should be almost 0 torsional offset between the two manifolds under any circumstance.
I get a major chuckle when people run these style manifolds and add a flex to the crossover because solid mounting it will "make it crack". Two months later, they are replacing a cracked flex.
Stop shooting yourselves in the foot.
There should be almost 0 torsional offset between the two manifolds under any circumstance.
I get a major chuckle when people run these style manifolds and add a flex to the crossover because solid mounting it will "make it crack". Two months later, they are replacing a cracked flex.
Stop shooting yourselves in the foot.