I currently have a H22 with full headwork and Skunk2 stage 2 cams. Currently my compression is 11.5:1. When I purchased a JDM H22 it came with a 80mm Q45 throttle body mounted to the intake manifold. I am looking for advice towards the possible effects of installing such a large throttle body.

 

Well 1st you have to figure out if the sensors on the throttle body you have will even with with your engine management unit....

 

80mm is way to big either way. I run a 68mm Holley with my H22.

 

All of the sensors do fit and operate properly.

 

BDL (was STR) 70mm

 

Do any sensors have to be changed if using a 70mm on a h22?

Im using a DTA fast engine management unit (www.dta-fast.co.uk)

 

why is a large throttle body a bad thing?

does the air lose velocity if it's too big?

 

the motor isnt efficient enough to need a TB that large.

 

Too large of a TB will cause a loss of bottom end torque

not that it's a good idea, but I have dyno'd on both dynapack and dynojet at around 750FWHP and 610 FWT on a Twin turbo 3.0 and a single 60mm TB
Of course FI is different than NA

 

http://www.maxbore.com/ Nice work! I think your throttle body is way to BIG!

 

the STR 70mm bolts right up, no problem, tps works and everything

 

i dont understand. if a person with a stock h22 motor throws on itb with even 42mm throttle bodies. 42*4=168mm for a 2.2 liter engine.
i personally purchased a 74mm for my car..
the easier it is for the engine to bring the air into the intake manifold the better. let the plenum and the runners make the velosity. if i could put 2 on my intake manifold and keep it streetable i would. HA.
bigger with intake manifold work . thumbs up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alterdcreations &raquo;</TD></TR><TR><TD CLASS="quote">i dont understand. if a person with a stock h22 motor throws on itb with even 42mm throttle bodies. 42*4=168mm for a 2.2 liter engine.
i personally purchased a 74mm for my car..
the easier it is for the engine to bring the air into the intake manifold the better. let the plenum and the runners make the velosity. if i could put 2 on my intake manifold and keep it streetable i would. HA.
bigger with intake manifold work . thumbs up</TD></TR></TABLE>

that really isnt a bad idea, design would be a bitch, but your thoughts are correct, brad from rlz says the same exact thing, he has never seen an h22 lose power from too big of a throttle, he says the bigger the better

 

rpm service 70mm or larger for h22

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alterdcreations &raquo;</TD></TR><TR><TD CLASS="quote">i dont understand. if a person with a stock h22 motor throws on itb with even 42mm throttle bodies. 42*4=168mm for a 2.2 liter engine.
</TD></TR></TABLE>


Math OWNZ you that is not how you calculate equivalent throttle plate size.

 

who makes anything larger. i think the reason h22 stop making power at 8,000 rpms is because the engine starves for air.

 

sorry this I brought this back but the miscalculation started bugging me and well here you go.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alterdcreations &raquo;</TD></TR><TR><TD CLASS="quote">if a person with a stock h22 motor throws on itb with even 42mm throttle bodies. 42*4=168mm for a 2.2 liter engine.
i personally purchased a 74mm for my car. </TD></TR></TABLE>

thats not the way to calculate area.

so here we go
42=dia so we have (pi)*r^2 so 21^2= 441&gt;&gt;&gt;441*3.14=1384.74&gt;&gt;*4(qty)= 5538.96 mm^2

74=dia 37^2= 1369&gt;&gt;&gt;*3.14 = 4298.66

I understand that the 74mm still has less area. but just remeber that with the short runners of an itb set up you still have your high velocity flow even with your large volume. with an intake manifold and a throttle body you loose the flow velocity when you go to a bigger throttle body.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kulrevon &raquo;</TD></TR><TR><TD CLASS="quote">sorry this I brought this back but the miscalculation started bugging me and well here you go.

thats not the way to calculate area.

so here we go
42=dia so we have (pi)*r^2 so 21^2= 441&gt;&gt;&gt;441*3.14=1384.74&gt;&gt;*4(qty)= 5538.96 mm^2

74=dia 37^2= 1369&gt;&gt;&gt;*3.14 = 4298.66

I understand that the 74mm still has less area. but just remeber that with the short runners of an itb set up you still have your high velocity flow even with your large volume. with an intake manifold and a throttle body you loose the flow velocity when you go to a bigger throttle body.

</TD></TR></TABLE>
i been told already but thank for clearing that up
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRiXZc &raquo;</TD></TR><TR><TD CLASS="quote">


Math OWNZ you that is not how you calculate equivalent throttle plate size.</TD></TR></TABLE>
i think it depends on how you port your runner in relation to tb size.
with the h22 intake manifold you can shorten the runners and gut it out. you also have to take cylinder head porting into effect. i feel everything has to flow together. on a stock h22 head and intake manifold i wouldn't use anything bigger than a 68mm tb. its all in the porter i feel . plus i havent seen a dyno where a bigger tb looses hp. unless the intake manifold isn't propley match ported

 

i still have to shorter the runners

 

That intake manifold setup has been tested before and doesn't perform well, just so you know.

Also, you're right that the easier it is to draw in air the better, but that isn't as simple as adding two throttle bodies or making huge ITBs, headwork on a FLOWBENCH is necessary to figure out what intake setup you need to design

 

the manifold isnt completed. i am going to grind down the walls that seperate the runner just past the rivets and also i have a couple more tricks for this manifold.
all designeed to work with each other.
the idea is to ALTER this mainfold into a short runner big plenum design.
i also have another tb plate to stack them and one that not cut out.
i also have another factory intake manifold so well see which combo works the best
the idea is to increase volume and velocity for the head that i ported