74 to 68 mm tb on stock h22a

[Ghetto_CB7]

Hello, I was just wondering if you guys though I would loose too much performance running a 74 tapered to 68 mm tb on a stock internal h22a.

H22a
Euro-R IM.
RDX Injectors
Bisi Intake gasket.
Stock JDM Header
60mm Cat back.
Chipped p28

I will be running the Bisimoto h22 header in the near future.... assuming the group buy happens.

I am aware of people who have had issues with too large of tb, but I haven't seen the issue be prevalent with h22's

Let me know what you think.

[porter351]

im running one with mine. only diffenance is i have pro1 cams. seems fine to me.

[MyDianaZ06]

well I have a h23a dohc vtec and it comes stock with 68mm tb but didnt have a Idle air adjustable screw valve so I swat it to a h22a tb and I noticed a big diffrerence! a bad diffrerence lol. its slower no at take off I beleive...I am putting my stock one back on

[PR CB7]

well I have a h23a dohc vtec and it comes stock with 68mm tb but didnt have a Idle air adjustable screw valve so I swat it to a h22a tb and I noticed a big diffrerence! a bad diffrerence lol. its slower no at take off I beleive...I am putting my stock one back on

its 65mm not 68mm

[Ghetto_CB7]

Tuned

well I have a h23a dohc vtec and it comes stock with 68mm tb but didnt have a Idle air adjustable screw valve so I swat it to a h22a tb and I noticed a big diffrerence! a bad diffrerence lol. its slower no at take off I beleive...I am putting my stock one back on

My first question to you is if it has been tuned since the TB has been installed, If not and you are still running stock map and stock tip in fuel then yes I would imagine it is much slower at low rpm's

EDIT: I read your post wrong, I read that the bigger tb made it worse, instead of the stock one. Thanks for the input!

[Ghetto_CB7]

Bump

Bump, in case anyone has any additional input.

[PR CB7]

im pretty sure, if you get at least a ebay header you'll see some gains

195whp gains, i know it maybe a lot, but, you have almost all of the intake part taken care already

stock JDM header will limit that engine, mostly because of the downpipe

[Ghetto_CB7]

Header size

The jdm header is actually pretty good. I would compare it to a cheap ebay header in terms of flow, and much better in quality. I agree I need a new header, but I am not going to get one until either the bisi group buy or until its gains have been shown.

[fatboy1185]

H22's love big TB's. Bore out the manifold to around 70mm if you can.

[Ghetto_CB7]

Manifold

The manifold will be bored to 68mm. Rosco and I discussed 70 and he said that If I am planning on running IACV to only do 68mm. He has never used the Polar Bear tuning 74-68 before so I am going to get it and let him see it.