Larger throttle body

[Scud2]

So I added meth injection to my 2v with a vortech. Went back in to get dyno numbers and to check all readings. I was 11.7 - 11.8 afr before meth. Now I am at 11.5. So I did not retune. I wanted to add it more for cooling the air. However I am not a genius in tuning. I have a 70mm throttle body. If I go to a 75mm will that kinda just average everything back out to the 11.7 ish or will it change things to much? I have a 2001 with an SCT tuner. Just looking for info. I know that the meth add a little more fuel. So in my head I see the 75mm adding a tiny bit more air. Maybe average everything out? Lol. Just wondering. Thanks

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[95GTspeeddemon]

It doesnt work like that. Use water instead of meth. 11.5afr is fine. I target 11.32 without meth. You can have it retuned to command a leaner afr while the iat's are cooler than without meth. Thats your options.

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[Scud2]

That's exactly what I was wondering. I also read that larger throttle body does not always mean bigger horse power in the sense I was talking. Also read that whenever you make changes you need to re tune the car. It was just a thought that was in my head. Thanks for the reply!

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[95GTspeeddemon]

Retune isnt needed in some cases. Different tb can make it idle different, so it could need some adjustment there, if mechanical adjustment doesnt make it happy.

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[ttocs]

be aware a cheap throttle body can cause idle problems because of its design. I had a pro-products 75mm that I finally just put a IAC restricter plate on as the only way it could be fixed. Replaced it with a better brand and never had another issue. Also a throttle body can only move the air the MAF allows and the stock maf can be fairly restrictive compared to aftermarket versions