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Old 01-25-2009, 06:13 PM   #1
jpstoner
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Question throttle body mod

i've been doing some looking around and I was wondering. when you bore out the throttle body (please correct me if i'm using the wrong term; i mean: http://www.qksltwo.com/tb.html ) i've read you are supposed to get a slight hp boost. My question is will it increase, decrease, or do nothing to your gas milage?

I purchased a $40 CAI off ebay and i think it gave me a small boost but dropped my milage by about 2 mpg. So will this also drop my milage or what can I expect?

Thanks in advance!
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Old 01-25-2009, 06:50 PM   #2
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Default Re: throttle body mod

You have to feed all of those new ponies, there is no free lunch unless you increase the efficiency of the combustion process.
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Old 01-25-2009, 07:41 PM   #3
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Default Re: throttle body mod

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You have to feed all of those new ponies, there is no free lunch unless you increase the efficiency of the combustion process.
Does this mean my $25 Speed Chip off of ebay does not give me free power?



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Old 01-26-2009, 01:55 AM   #4
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Default Re: throttle body mod

makes sense. thanks
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Old 01-26-2009, 02:06 AM   #5
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Default Re: throttle body mod

Do the TB mod if you want, and don't worry about 1mpg?? Just go for it, will increase your reaction and maybe 1hp
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Old 01-26-2009, 08:18 PM   #6
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Default Re: throttle body mod

skip the porting and get a geo storm throttle body
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Old 01-26-2009, 08:23 PM   #7
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Default Re: throttle body mod

Yeah, the Storms SOHC TB is larger then ours can be bored to and the DOHC TB is larger still.
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Old 01-26-2009, 10:55 PM   #8
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Default Re: throttle body mod

In all reality unless you are boosting or trying to make some good power, TB isn't going to do much for you. Except increase throttle response.
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Old 01-27-2009, 01:49 AM   #9
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Default Re: throttle body mod

So any metro TB will be a directly swap? Same hoses, same screws and all that? I saw a geo metro when i got the 92 headers on the junkyard. Here are the pics

I'm doing the bore at home, then SRI
Attached Images
File Type: jpg tb2.JPG (39.7 KB, 91 views)
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Old 01-27-2009, 02:14 AM   #10
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Default Re: throttle body mod

thkx for the link very cool
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Old 01-27-2009, 01:04 PM   #11
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Default Re: throttle body mod

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Originally Posted by black98dohc View Post
So any metro TB will be a directly swap? Same hoses, same screws and all that? I saw a geo metro when i got the 92 headers on the junkyard. Here are the pics

I'm doing the bore at home, then SRI
Where did anyone say Geo Metro? Storm =/= Metro.

The storm tb will bolt up, the TPS & IAC either plug in or splice in, and the throttle cable requires a custom bracket.
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Old 01-27-2009, 01:26 PM   #12
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Default Re: throttle body mod

Storm then, sorry
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Old 01-27-2009, 05:06 PM   #13
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Default Re: throttle body mod

As PurdueGuy said, you will need a custom throttle cable bracket. As the Storm I believe is back farther then out stock location. Or vice versa can't remember exactly.
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Old 01-27-2009, 05:38 PM   #14
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Default Re: throttle body mod

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Originally Posted by PurdueGuy View Post
Where did anyone say Geo Metro? Storm =/= Metro.
LOL, I was wondering about what kind of performance parts y'all were wanting to pull from a 3 cylinder 1.3 liter engine

I test-drove a Storm when they first came out, and came this close to pulling the trigger on buying one. Kinda glad I didn't, seeing how they seem to have held up over the years.
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Old 01-27-2009, 05:48 PM   #15
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Default Re: throttle body mod

I'll check the sizes and see what i can do, otherwise i will open up my own, but do it throught the whole TB, not like others do, bore till the butterfly or door, thats not a mod. You need to fully open the ID of the TB to let it better flow
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Old 01-27-2009, 08:24 PM   #16
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Default Re: throttle body mod

People bore out both sides of the TB to the butterfly plate. You can't bore out around the TB plate because obviously the plate wont fit snug.
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Old 01-27-2009, 09:15 PM   #17
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Default Re: throttle body mod

Quote:
Originally Posted by black98dohc View Post
I'll check the sizes and see what i can do, otherwise i will open up my own, but do it throught the whole TB, not like others do, bore till the butterfly or door, thats not a mod. You need to fully open the ID of the TB to let it better flow
If you remove material around the throttle plate, your car will never idle right again unless you replace it with a larger throttle plate. It also doesn't help to port the throttlebody out on the backside any more than to match the intake manifold.
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Old 01-28-2009, 11:52 AM   #18
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Default Re: throttle body mod

Of course i will not leave the stock plate if i'm doing the full ID bore. And i'm also matching with the intake manifold size. I've done this to both of my friend's civics and they worked good.
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Old 01-28-2009, 01:07 PM   #19
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Default Re: throttle body mod

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Originally Posted by fetchitfido View Post
Yeah, the Storms SOHC TB is larger then ours can be bored to and the DOHC TB is larger still.
Are either or both of those both of those direct fit? I have an sohc, and any lil bit will help.
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Old 01-28-2009, 01:18 PM   #20
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Default Re: throttle body mod

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Originally Posted by RBrown20 View Post
Are either or both of those both of those direct fit? I have an sohc, and any lil bit will help.
Quote:
Originally Posted by PurdueGuy View Post
The storm tb will bolt up, the TPS & IAC either plug in or splice in, and the throttle cable requires a custom bracket.
That is for the dohc, not sure about the sohc, but you would still need the custom bracket for the throttle cable.
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