h22 throttle body -> m62 blower : gains from porting?
04-23-2002, 08:31 PM
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h22 throttle body -> m62 blower : gains from porting?
my throttle body is 62mm on the inlet and outlet sides, or 3020 sq mm. it plugs into a short (<4") cast s-pipe of sorts which is 64mm on the inlet side (3215 sq mm) and transitions internally to a rectangular opening with radiused corners of approx 115 x 33mm (3700 sq mm.)
given this, do you guys think there are possible gains from a larger or ported throttle body? if i recall it was good to have a slight increase in diameter at each junction, which makes it sound like i should probably hog out the beginning of the s-pipe too. i doubt the TB can any further than 66mm, but that's still a reasonable increase in area.
while i'm at it, what does one do about the throttle plate? get a bigger one!?!?
given this, do you guys think there are possible gains from a larger or ported throttle body? if i recall it was good to have a slight increase in diameter at each junction, which makes it sound like i should probably hog out the beginning of the s-pipe too. i doubt the TB can any further than 66mm, but that's still a reasonable increase in area.
while i'm at it, what does one do about the throttle plate? get a bigger one!?!?
04-28-2002, 08:57 AM
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Re: h22 throttle body -> m62 blower : gains from porting? (schwett)
There is a lot of information on porting JRSC's on http://www.theoldone.com. You can get information about porting the manifold, blower, or s-tube. I know Larry has talked about throttle bodys also. If i remember correctly you will have to do a search? or maybe e-mail them? It's been a while since i've been on the site.
04-28-2002, 09:06 AM
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Re: h22 throttle body -> m62 blower : gains from porting? (schwett)
Mark,
I had the stock Si throttle body (60mm at the exit) and I had my inlet tube machined out to 64mm so that I could use my RC Eng bored throttle body (64mm).
The hole in the JR inlet tube was off-center and not even round!
Here's a pic of the "after":
Anyway, I ran both throttle bodies back-to-back at DSR on the dyno. I had the coolant lines bypassed so that I could do the swap quickly. Result? EXACT same power curve. No gains anywhere!
Disclaimer: I was still running the stock JR "fuel management" and my a/f above 6000 was soooo rich that it was off the scale on the DSR sensor. Throttle bodies tend to help out in the mid and on top and my car was running so badly there that the potential gains of the bigger throttle body were probably negated. I ended up selling the larger throttle body and applying the money towards my Hondata.
Sonny
I had the stock Si throttle body (60mm at the exit) and I had my inlet tube machined out to 64mm so that I could use my RC Eng bored throttle body (64mm).
The hole in the JR inlet tube was off-center and not even round!
Here's a pic of the "after":
Anyway, I ran both throttle bodies back-to-back at DSR on the dyno. I had the coolant lines bypassed so that I could do the swap quickly. Result? EXACT same power curve. No gains anywhere!
Disclaimer: I was still running the stock JR "fuel management" and my a/f above 6000 was soooo rich that it was off the scale on the DSR sensor. Throttle bodies tend to help out in the mid and on top and my car was running so badly there that the potential gains of the bigger throttle body were probably negated. I ended up selling the larger throttle body and applying the money towards my Hondata.
Sonny
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