wha idiot told you this? for starter ppl have been putting 250whp+ w/a oem im portmatch to a 60mm tb. second, a Blox, Sk2, edelbrock and other aftermarket im are 62mm portmatch. and alot of those company don't make 62mm tb. except Type-R OEM tb(have fun finding for one, they'll run $200-$450, more towards the latter) BBK do make a 62mm. now unless you have done stupid upgrades like custom cam(way beyond stage 3) anything beyond a 60mm tb will not help you.other than my OEM TB and IM are not sufficiant and need to be upgraded, so any and all input is welcome.
Probably benefit more getting a b18c1 (LS) Throttle body which is 60mm, because the b16a1 throttle body is only 58. Where as the D16y8 is 56.
Consider this. You're increasing the size of the throttle body but you're not increasing the size of the plenum, runners, or ports. Do you have stock internals? You're most likely going to lose power from this mod.
Bottom line, if you don't have the mods to support this mod, you're going to lose power.
Because you don't have the mods to support it. You're trying to put more air into the motor than it can effectively use, the O2 sensor will not compensate for this...tuning the ECU will, though. There's a methodical order to building a motor, you're missing the compression, cam, and headwork for that large of a throttle body to do anything.
The best rule of thumb is to start from the cam outward. Get the cam that you want, head work to support the particular cam and setup, Skunk2 IM (for n/a) or Edelbrock IM (for f/i), and then a larger throttle body. The size throttle body you'll need ultimately depends on what CFM you want to flow. This way all of the mods are working together towards the same goal, getting the motor the amount of air it needs to make optimum power. That's what I mean when I say, "there's a method". Just slapping parts onto a motor will generally, as a rule of thumb, lose power.
And one of the most important rules about making power, just because it feels good to the ol' butt-dyno (we all love it, don't we?) doesn't neccessarily mean that you're making optimum power.
You may be correct. I found this list from the company that ported my manifold and throttle body.b18c1 is a GSR....i thought all b series tb is 60mm..i could be wrong tho but thats what ive read in the past. h22 is 64 if i believe....