I have a 93 integra gs non-vtec. I just put on a 70mm skunk2 throttle body and i'm getting about 11mpg now. What is wrong? There are two hoses that were connected to the old throttle body that can't connect to the new one, but it's the right tb for the car. Any help?

Before i put it on i was at about 25 mpg and i drove it hard. 11mpg is horrible... i can go about 100 miles on a tank.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aasoccerplaya &raquo;</TD></TR><TR><TD CLASS="quote">I have a 93 integra gs non-vtec. I just put on a 70mm skunk2 throttle body and i'm getting about 11mpg now. What is wrong? </TD></TR></TABLE>


hahaha 11mpg...wtf

as an aside, why the hell did you go so big on the TB? is your IM port matched to the TB?

seems to me not much research was done here, and thus you are reaping the benefits of lack of knowledge

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GRAF-FITI &raquo;</TD></TR><TR><TD CLASS="quote">


hahaha 11mpg...wtf

as an aside, why the hell did you go so big on the TB? is your IM port matched to the TB?

seems to me not much research was done here, and thus you are reaping the benefits of lack of knowledge

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x2
haha that sucks but funny

 

There is a leak somewhere. It happened to me when I replaced my intake manifold and used the wrong throtle body gasket. Except on my GSR I got 9mpg.

 

Does the car idle fine? Check the TPS voltages at closed and open throttle. is it within specs? And yes 70m is way too big for anything non boosted.

 

yeah i actually just replaced the tps with a brand new one cuz i heard that may be the case. . . and it idles smoothly, but just a bit high (about 13-1500)

 

yeah another stupid decision on my part, i didn't get the right gasket, i actually just put a liquid gasket straight from the tube and let it dry

 

70mm? i wonder how much CFM that equates to. I've seen 350-400hp Ford 347ci motors that only run a single 65mm. Did your throttle responce go to hell? Also the TB shouldn't effect MPG, just driveability. Something else happend would be my guess. All the TB does is regulate air.

 

yea no research was done at all... i'm most def a newbie at this. kinda learnin as i go. so i need a new im to match the tb? someone else said its too big for anything non boosted. . . that true?

 

yea seriously that's what i was thinking... i mean i know mpg would suffer a bit, more air need a bit more gas but not 10 mpg worth. Its burning really really rich.

and honestly, throttle response improved - a lot. more power and everything... especially on the immediate response end.

 

Throttle responce comes on stronger because this 70mm beast flows as much air at part opening as your OEM one did wide. If someone was doing this engine professionally they would flow the head, the manifold and the head-manifold combo to get an idea of how much air the engine is capabile of using and then bolt the smallest TB on that flows just a touch over what the maximum number calculates out to. The reason being is this: you don't want a TB to be any type of restriction; however once it can flow as much as the engine will use at max rpm, larger just makes the throttle more touchy as max cfm is reached before the blade is wide open. Did you check for vaccum leaks after this install? that would be the first place i would look. You used all new gaskets right?

 

i put that old one on... and it's back to original mpg... thanks for all the help guys!

 

so what would you guys suggest be the biggest TB size used for an all motor setup? what should be taken into consideration when changing your TB? I have 4-2-1 headers, intake, after-market manifold on a stock GSR (for now). What size would be appropriate if I decided to upgrade?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StReCh4130 &raquo;</TD></TR><TR><TD CLASS="quote">so what would you guys suggest be the biggest TB size used for an all motor setup? what should be taken into consideration when changing your TB? I have 4-2-1 headers, intake, after-market manifold on a stock GSR (for now). What size would be appropriate if I decided to upgrade?</TD></TR></TABLE>

65mm w/ port matched IM

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GRAF-FITI &raquo;</TD></TR><TR><TD CLASS="quote">

65mm w/ port matched IM</TD></TR></TABLE>


Interesting. I have a similar setup... I have a Power TB for a GSR that is a 68mm. The company I bought it from in Vegas bored the Inlet to 73 or 74MM can't really remember... with an S2 IM port matched, Do you think this is to extreme for a GSR with 11.4 Compression and and Mildly built head????

I thought the inlet being big would provide more air flow and since the out to the IM is still 68mm it would still keep close to intake Velocity in an ITR, Since ITR Stock is 67 I believe....

I have noticed a slight loss of power when launching from first gear at 1k but If I rev before puting in gear and launch there is more power and top end excellerating is also faster

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ProjectEGSiR &raquo;</TD></TR><TR><TD CLASS="quote">
Interesting. I have a similar setup... I have a Power TB for a GSR that is a 68mm. The company I bought it from in Vegas bored the Inlet to 73 or 74MM can't really remember... with an S2 IM port matched, Do you think this is to extreme for a GSR with 11.4 Compression and and Mildly built head????

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68mm might be pushing it as that range from 68-70mm is usually most accomodating to forced induction setups

if you have proper tuning and fuel for your high comp setup, i would go no bigger than 68mm, period. i am confused though where you say it was bored 73/74mm....

having a non-port matched IM and TB creates a "bottleneck" for incoming airflow

and as an aside, stock type r IM and TB are 65mm

 

Rather than boring you with a long explanation about why your 70mm was a bad choice for your setup, i'll offer this: I'm going to make over 400whp in the spring and do it with a stock GSR throttle body.

Many people see an oversized TB as a quick way to gain power; however, your car is only going to take in so much air no matter how large the hole is...