Misfire/stalling issues

[MBS206]

2 hours ago, Dose Pipe Sutututu said:

My point is more so focused on the division between cylinders 1 to 3 vs 4 to 6.

Any low mount "bolt on" aftermarket manifold utilises an open T3 collector which has crap all scavenging effects.

Sure it might allow you to slap in more timing up top to make a little more but you'll lose all the down low performance.

Even Tao from @hyper-gear has experienced the same when modifying the stock manifold. He has experienced added lag by cutting out the divider inside vs. leaving it alone.

Twin scroll works, even if the effort is focused primarily on the manifold and an open scroll turbine housing.

Please don't confuse me with a V8 NA or Americans that thinks you need back pressure in a 4 stroke motor.

Your claim of "same turbo, same boost, same timing" is why I commented on it. You can't change how the exhaust flows, not alter the ignition or fuel map, and instantly say one is worse than the other, as one is likely now out of tune to the other.

 

While turbo lag isnt great, it's also not the whole picture. Nor would I say the factory manifold is the best for fluid dynamics. That and most GOOD aftermarket manifolds additionally aren't aimed at stock/small sized turbos, nor do most of the companies building them have a Great idea on fluid dynamics, they just understand and build to the same basic principles. Those aftermarket manufacturers also don't have epically huge budgets to go doing shit tonnes of R&D to get the best performing manifold.

[Dose Pipe Sutututu]

I'm not going to argue with you.

OP just wanted to replaced his stock manifold with another one for his stock turbo.

Besides wasting money, he will achieve nothing besides added lag and most likely 0 additional power.

[Watermouse]

Maybe of interest,

a little while ago I spoke to one of the guys from Rajab Racing Developments and he hinted to me they could be developing a new cast exhaust manifold. Incidentally, they have already made one for the barra and it looks functional 

[MBS206]

On 6/14/2024 at 9:46 PM, Dose Pipe Sutututu said:

I'm not going to argue with you.

OP just wanted to replaced his stock manifold with another one for his stock turbo.

Besides wasting money, he will achieve nothing besides added lag and most likely 0 additional power.

Ha ha, sorry dose, I wasn't meaning to argue the point on "it'll do f**k all". I was only shining a bit of a light in the flawed logic you used with it mate.

 

I 100% agree that there is zero point changing stock manifold with a stock turbo, unless the manifold is f**ked. And only reason I'd ponder aftermarket manifold on a stock turbo would be that I'm too scared too look at the potential ludicrous prices people are asking for a stock manifold! Ha ha ha