70mm or 75mm??
performance-wise, is there a big difference between the 70mm and 75mm throttle body/plenum's, like from this site and others. in the long run, does it really matter which one you get?
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The 75 mm will give you about 2 more hp when match witht he correct plenum. Also, if you have plans for a blower down the road, the 75 will be better. I tend to think that the 70 mm idle a little better, though.
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Normal rule of thumb is that if you dont have a power adder nor plan to put one in your car, than stick with 70mm.
other wise go with 75mm. |
I have a 75mm Ford Racing TB and #1 is right, idle is rougher. I even had a small problem with it killing when coming to a quick stop, but I fixed it by adjusting the TPS.
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I have an Accufab 75 mm and plenum installed and I see no idle problems at all.
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Originally Posted by Chopper
I have an Accufab 75 mm and plenum installed and I see no idle problems at all.
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I called Accufab today with the same question (70vs75) Accufab told me that there 70mm flows almost the same as the 75mm and they recommend that if you have a stock car with just a few bolt on's such as mufflers and air filter go with the 70mm and If you have a very free breathing engine such as headers and o/r pipe and perhaps cams and or ported heads go with the 75mm. I also asked them about idle quality and throtle response differences and they said there wouldn't be a noticeable difference between the two. I ordered The 75mm just so I don't regret it later if I ever go ahead with cams and headwork.
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