Boport Manifold Questions

[88turbobird]

First post here on Stinger! I own an 88 Turbo Coupe and was able to get my hands on a boport stainless steel exhaust manifold with a tial external wastegate for a great deal.

I haven’t had a chance to mock up the new manifold and I have some questions for those who have experience with it. The plan is to eventually replace the stock IHI with a t3 or t3/t4.

My questions for anyone who has this manifold:
I have a FMIC that utilizes the throttle body in the stock location (upper is not rotated). Will the manifold interfere with this charge piping? The mounting holes looked small on the boport manifold... are they the same size as the stock e6 manifold (in regards to bolting to the head)? What has everyone done for an oil return when using this manifold? It seems like the turbo will be mounted lower than stock. And last question; are they any off the shelf downpipes that fit with this manifold? I’m guessing I’ll have to make a custom downpipe. Sorry for the essay but thanks for the help!!

[Stinger]

If you run a stock (IHI or T3) turbo, you're better off just running a stock cast manifold.

FMIC tube interference? Probably, though exact FMIC routing will ultimately determine that.

Bolt holes should be the same size, though it uses shorter bolts.

Custom oil line.

Turbo will be much higher than stock, maybe you're thinking it's mounted with the turbo "hanging"?

No, though our header downpipe with no flange should be close enough to work with little modification.

[88turbobird]

Dec 17, 2017 22:22:53 GMT -5 Stinger said:

If you run a stock (IHI or T3) turbo, you're better off just running a stock cast manifold.

FMIC tube interference? Probably, though exact FMIC routing will ultimately determine that.

Bolt holes should be the same size, though it uses shorter bolts.

Custom oil line.

Turbo will be much higher than stock, maybe you're thinking it's mounted with the turbo "hanging"?

No, though our header downpipe with no flange should be close enough to work with little modification.

Thanks for the reply!

I previously had big power goals with the car and the manifold with wastegate was a great deal but I've been debating on what route to go with the car. I might sell this manifold and possibility go with a gnari

[Stinger]

What's wrong with an E6? Flows the same as Gnari, doesn't require an external wastegate (saves a couple hundred dollars there alone), doesn't require fabrication of a wastegate dump tube, allows for better access to the spark plugs, and supports at least 350hp.

[88turbobird]

Dec 18, 2017 13:05:49 GMT -5 Stinger said:

What's wrong with an E6? Flows the same as Gnari, doesn't require an external wastegate (saves a couple hundred dollars there alone), doesn't require fabrication of a wastegate dump tube, allows for better access to the spark plugs, and supports at least 350hp.

Honestly, nothing at all. I just have a personal preference towards external wastegates. I've ran them on all my turbo cars. I like their ability to better control exhaust gases/ boost pressure (at high boost pressures that is) and unlike most people, I like the sound of an open wastegate pipe

[Stinger]

No problem, just wondering. I dislike the open WG noise not because of the sound but because it makes it impossible to hear detonation and it "hits" at the same time as detonation would.

External wastegates are better at controlling low boost where turbine input pressure is low. At high boost/high turbine input pressure, both should work.