18G & EV0 3 Battle. “Final Closure”

[daren_p]

Each exhaust pulse is coming out of a relatively small diameter exhaust runner before it hits the wider collector. So it already has to expand. Expanding more isn't going to help.


After porting a turbo or spending money on it, you want to feel a difference.

Yes but when you port the turbine inlet to remove the ring step & the exhaust mani to match, the actual size of the collector just before the outlet that you are porting on the mani is still larger then the ported outlet/turbine inlet itself. So where this is ported wouldn't be another expansion, if anything I would think it would be a smoother transition into the turbine inlet from the larger collector area before the mani outlet. Like I said can't prove anything as far as top end goes as I don't have before/after logs but I did compare spool when I had the t25 & the ported turbo did infact spool faster.

I know you can always say they do it to make extra money but why do even the most reputable shops offer porting on the MHI turbos if its such a bad idea?

 

[andymoraitis]

See thats my problem, im having a hard time finding a turbo that doesnt have the same TQ hit.


Thats why im just going to go big, I cant seem to find a hard hitting turbo that will please me so im just going with a large turbo setup.

Buschur 20G. Hits like a ton of bricks and spools quickly. Just a thought.

Andy

 

[JOEY A]

Buschur 20G. Hits like a ton of bricks and spools quickly. Just a thought.

Andy

Thanks illl look into that, my motor is being built with 9;1 comperssion so Off throttle boost will be good on it.


Thanks

 

[Tom N]

I would agree that porting the hell out of the exhaust manifold and turbo don't serve any real benefit. Just having a smooth transition is what you want.
Oh and the evo316g owns the 18g.

 

[Eclipse223]

Guys we r a little off TRACK on the topic.

 

[JOEY A]

Guys we r a little off TRACK on the topic.

Sorry