For those who have experience with the Q45 TB

[6bolt2g]

I am looking into how I can adapt my 3" GM MAF to the q45 TB. I know the easiest way would be to get a 3.5" MAF, but I dont have the cash at the moment :cry: My question is will a 3" silicon coupler will squeeze over the q45 TB? It measures to 3.5" to the outside. I have to order a 45° or a 90° coupler and I dont want to buy more than one.. :rolleyes: Or, looking at the other way, would the 3.5" coupler blow off the 3" MAF if it were clamped down?

Any help or ideas would be appreciated,
Thanks

[Glenn]

You will not get a 3" coupler over a 3.5" pipe/TB nor will a 3.5 coupler clamp down leak tight on a 3" pipe.

Do it right the first time and save yourself the issues later.

[6bolt2g]

Then I need to find a 90° 3.5" to 3" coupler :cool:

[woody91gsx]

You will actually need a 4" to get over the 3.5". Remember, 3.5" is the I.D., not O.D.. I had one my old car. I had to order a special silicone elbow to connect from the MAF to the TB. If you'd like, I have a few pictures of my setup somewhere. Let me know if you want me to post them.

[Glenn]

So couplers are sold based on the outer diameter not the inner? IE. A 3 inch coupler is 3 inches to the outside?

[slowstang]

You will actually need a 4" to get over the 3.5". Remember, 3.5" is the I.D., not O.D.

If thats the case wouldn't the 3in MAF actually be closer to 3.25-3.5in then? That would make the use of a 90deg 3.5in coupler a little more plausible.

[EaglesFly]

He will need a 3 3/4" coupler to fit over the outside of the Q45. Couplers are measured I.D. The O.D. of the Q45 is about 3 5/8".

[woody91gsx]

Yeah, I had a 4" on mine with no problem. I'll post pics if I'm able to. Search anfd you might find some already here. I have to pack for a trip tonight, so if I have time, I'll try to re-post them if they're not here.

[6bolt2g]

So couplers are sold based on the outer diameter not the inner? IE. A 3 inch coupler is 3 inches to the outside?

I think it depends on the company that makes them. I think the less expensive ones are measure from the outside and the nice/expensive ones are usually measured from in inside (I.D) . At least that's what I have seen.
Egay has some 45° 4 to 3.5 and 3.5 to 3 for around 25-30 shipped.

[ROYALGSX]

Egay has some 45° 4 to 3.5 and 3.5 to 3 for around 25-30 shipped.

Just remember, you get what you pay for....

[6bolt2g]

I hear that!
Just have to figure out whats garbage and what is alright.
Im gonna install the Link before I install the manifold and TB so I have a little while before I tackle all that. I just ordered my usb to serial adapter. And I found my strange driveability problem, my alternator is not charging, its enough to slow my fuel pump and run lean :lame:

[slowstang]

I hear that!
J And I found my strange driveability problem, my alternator is not charging, its enough to slow my fuel pump and run lean :lame:

If it's that bad I wonder why you haven't seen a dead battery yet. It didn't take long for mine to die driving with no alt.

[Glenn]

Might be putting out low voltage or erratic voltage.

[6bolt2g]

Or might be because my batt has been dieing and I put a freshly charged one in last night when I found out :silly:

When it warms up outside a little I'll take a look at it. It might be a fuse or something. Or a loose plug.