My compression is at 12.6:1 would like to know which throttle body i should use.. i was thinking of boring out the opening to my skunk2 intake manifold to match the new throttle body.. just not sure which size to go with.. I was thinking 70mm but i keep reading that it is too much.. last time i dyno'd i was at 180whp.. that was before port and polish and the high compression skunk2 valves.. I'm guessing I should be around 200whp now..

 

Id go with a 68mm throtle body, Im aiming at 225whp and its what ill be using(bored ITR throttle body). I also know that erick racing and spoon sell 70mm throtle body

I dont think 70mm will be a problem, its only a question of tuning

 

main reason i ask.. is cuz i see people even saying 64mm is the max and that 70mm is only good for turbo'd motors.. are you boring out the opening to your intake manifold as well?

 

I have see dyno charts done on n/a motor with large bore and stock bore t/b and there was no difference at all. The only time it makes a difference is when air is being pushed into the intake ( turbo ).

 

really?? hrmmf.. how modded was the motor tho?

 

My engine-1932 cc motor with Skunk2 Stage 2 cams picked up 2-3 hp throughout the power band with an Erick's Racing 70-68mm tapered TB vs the 62mm Type-R TB. The green line is the big TB.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by GSlowR &raquo;</TD></TR><TR><TD CLASS="quote">really?? hrmmf.. how modded was the motor tho?</TD></TR></TABLE>

It was in a book call How To Build Honda Horsepower by Richard Holdener. It has all sorts of different setups that have dyno verified results, its a great book.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">
My engine-1932 cc motor with Skunk2 Stage 2 cams picked up 2-3 hp throughout the power band with an Erick's Racing 70-68mm tapered TB vs the 62mm Type-R TB. The green line is the big TB.</TD></TR></TABLE>

What do you have the vtec set at? Seems like you are loosing lots of hp in the midrange.

EVIL

 

i'd guess 5.6k

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by advanracing62 &raquo;</TD></TR><TR><TD CLASS="quote">i'd guess 5.6k</TD></TR></TABLE>
At that time, the car was running a chipped P28 ECU, with a 9,200 RPM redline and VTEC at 5600. Good guess.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by quik1 &raquo;</TD></TR><TR><TD CLASS="quote">

It was in a book call How To Build Honda Horsepower by Richard Holdener. It has all sorts of different setups that have dyno verified results, its a great book.</TD></TR></TABLE>



That book blows period. (just my .02 cents)

I've seen 2-3 hp on a JG 65mm T/B on a stock GSR block after tuning. 4-8 hp on a modify N/A 1.8L before.

Again, tuning is the key.

Now that I'm thinking, I may take the time and $$$ to compare a stock S2000(62mm, the same as ITR) vs the JG's 65mm in the next upcoming months.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by b19coupe &raquo;</TD></TR><TR><TD CLASS="quote">
At that time, the car was running a chipped P28 ECU, with a 9,200 RPM redline and VTEC at 5600. Good guess.</TD></TR></TABLE>

Drop that vtec to 4,700 - 4,900 and you will see HUGE midrange.
EVIL

 

Actually, with the Toda "D"s, if I drop VTEC down that low, the car will run like poop. Toda midrange is very nice, non-VTEC lobes

 

I was just talking about the graph you posted, maybe not your current setup. My buddy has an eg making 240 hp at the wheels out of a 1.8 bseries running 12.3 @ 110. His vtec is set at 4,800 with toda spec C's. That car you dont even hear the vtec with ITB's, it just rips.
EVIL

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Evil DOHC &raquo;</TD></TR><TR><TD CLASS="quote">My buddy has an eg making 240 hp at the wheels
EVIL</TD></TR></TABLE>
Someday...

 

b19coupe sounds like you already have with allmotor 220 to 240+ package how come only 205???

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B19c5-eg6 &raquo;</TD></TR><TR><TD CLASS="quote">b19coupe sounds like you already have with allmotor 220 to 240+ package how come only 205???</TD></TR></TABLE>

His 205 whp was done at Importbuilders...
That is is like 230 whp at Area51....

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B19c5-eg6 &raquo;</TD></TR><TR><TD CLASS="quote">b19coupe sounds like you already have with allmotor 220 to 240+ package how come only 205???</TD></TR></TABLE>
That's what I want to know
I have another block, getting much bigger pistons and going back to the dyno in about a month.

 

What intake manifold where you using?

Did you port match the tb to the manifold?

 

ITR intake manifold-port matched to the TB.

 

ahh thanks for all the input guys.. I noticed you said 70mm tapered down to 68mm. would 70mm all the way thru be bad? or is it better to get one that tapers down?