75mm tb w/2g intake manifold

[gSx_r1der]

I have been looking for a few days now and I have yet to be able to find out if anyone has done this or if it is possible, I'm trying to get a 75mm/mustang tb and mate it up to an opened up stock intake manifold. The reason for me not wanting to upgrade my manifold is because I dont plan on revving past 7500 or 8000 because of stock valvetrain and my car would see hardly any track use, so I wanted to maintain my low end and mid range torque but wanted my car to be able to breathe up top. Anyone have any input??

 

[CanadianTSi]

A 60mm TB will take a 2g Intake Manifold as far as it will ever go, going bigger is absolutly useless.

 

[mirkoelek]

the most you can port on your 2g intake manifold would be 63-65mm, bigger than that you'll have to port whole manifold inside.... not smart thing to do... as other guy before me said 60mm would be more than enough

 

[ericbev]

I dont have one to measure, but 53mm is 2.0488in and 75mm is 2.954in. So, the 75mm is almost a whole inch larger in diameter. Would there even be enough room to port it out a whole inch to accomidate something that big? Are the mounting studs in the same locations? Isnt that something that is specified when ordering a SMIM? I am not sure this is possible.

 

[madman]

I ported my stock intake manifold at the TB flange to match a 1g 60mm TB and it started to get real close to the sidewalls of the manifold.

I agree with mirkoelek above, that at the most you could port it to 63mm ~ 65mm. Beyond that you would start to thin out the sidewalls at the flange and weaken the manifold.

 

[92tsifwd]

no room for a gaskit. With a 1g intake manifold the bigest I have seen was a stock 4.6 mustang 65mm tb.

 

[gSx_r1der]

thanks for the info, i have had my question answered