SdGSR01

Do you guys just run with the secondaries fully open all the time? I know its been covered, but not with the info I need. I'm just getting ready to put in my turbo in Thursday night and am making my list of mods I need in the next two months(fuel pump, boost controller) and want to know how much of a priority getting a new IM should be. I'll be running Hondata, so I'm not sure if that'll make any difference. Basically I want to know will it be a minor annoyance, or will i cost me some serious HP? I have exactly enough to cover a new IM now, but wanted to hold out in case something comes up during the install.

Scott - 93HB Si

run the butterflies open, or better yet - make the P28 able to run P72 code and control the butterflies

Boofster

Or even better, go Skunk2 IM

B18Flip

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Scott - 93HB Si &raquo;</TD></TR><TR><TD CLASS="quote">run the butterflies open, or better yet - make the P28 able to run P72 code and control the butterflies</TD></TR></TABLE>

how do you do that?

EDIT: i mean converting a p28 to control the butterflies

SdGSR01

You just disconnect the vacuum line, from what I've read. Would I see $300 worth of gains if I get a Skunk 2?

mekkis

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18Flip &raquo;</TD></TR><TR><TD CLASS="quote">

how do you do that?

EDIT: i mean converting a p28 to control the butterflies </TD></TR></TABLE>

Sift http://wiki.pgmfi.org

"ECU HardwareMods"

SdGSR01

I think I'd just pay someone to hook up a chip, wouldn't even try that myself.

Honda_Tengoku

disconnecting the IAB's on a naturally aspirated B18C1 I have heard of some serious torque losses but on boost, from what I have heard it causes a restriction and the B18C's do better without them. The IAB's are spring loaded open, and vacum closed. so if u leave the car running and pull the vacumm line off of the diaphram. The should instantly slap open and stay that way. Personally I am going to remove the throttle plate and the shaft on my H22A and have the holes welded, but of course that is a totally different engine. As far as the skunk2 manifold, I have heard good things about it. Supposed to make good power increases. If u have the money personally I would go skunk2 but thats just me.

RudeLude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Honda_Tengoku &raquo;</TD></TR><TR><TD CLASS="quote">disconnecting the IAB's on a naturally aspirated B18C1 I have heard of some serious torque losses but on boost, from what I have heard it causes a restriction and the B18C's do better without them. The IAB's are spring loaded open, and vacum closed. so if u leave the car running and pull the vacumm line off of the diaphram. The should instantly slap open and stay that way. Personally I am going to remove the throttle plate and the shaft on my H22A and have the holes welded, but of course that is a totally different engine. As far as the skunk2 manifold, I have heard good things about it. Supposed to make good power increases. If u have the money personally I would go skunk2 but thats just me.</TD></TR></TABLE>

if u disconnect the vacuum from them, they are supposed to stay open on the h22 right? how does this affect performance for a boosted h22?
thanks
dnaiel

SdGSR01

Cool, thanks for all the info. You guys totally answered my question. You guys are making my decent into the dark side very easy.

Honda_Tengoku

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

if u disconnect the vacuum from them, they are supposed to stay open on the h22 right? how does this affect performance for a boosted h22?
thanks
dnaiel</TD></TR></TABLE>

yes. I run with mine open all the time on my H22 and its still NA for the time being.
I disconnected my IAB's and where I have my VTEC set (4600 RPM) I have noticed a big difference. I think since my VTEC engagement was set so low that the IAB's were coming on too late and my engine may have been restricted by airflow. I think my IAB's were not functioning properly either, so that may have been some of my problem.
As far as running them when u are on boost well I have heard of people having the IAB's being held closed by boost when they are hooked up and functioning properly. The theory is when the engine recieves positive pressure (way b4 the IAB's ever open up) sometimes (depending on how much) can hold the IAB's closed cuz the spring pressure cannot overpower the pressure in the manifold. Atleast thats the theory. I have never seen any real test reslults on this so dont quote me on this one. Not to mention a boosted engine doesnt need any IAB to create torque cuz a properly sized turbo will create that and more. The IAB's create more a restriction than anything on a boosted H22. Cuz the H22 was never designed to flow that volume of air at that low of RPM. Personally I am going to get rid of them on my H22 all together (shaft, diaphram and plates).
On the B18C1 I would be more inclined to do a skunk2 manifold, or something similar. The reason I say this is cuz the dynos that I have seen when B18C1 are naturally aspirated they lose tons of torque. Like 10-15 foot pounds of torque throught the entire lower, to midrange RPM by disconnecting the IAB's. Now on boost obviously a properly sized turbo should negate any loses, but it also depends on the turbo size, and when the turbo creates boost too. If your turbo doesnt create boost till 5000 RPM, well u are going to lose tons of torque below that with the IAB's open. Alot of the people on H-T are turbo envious and like dyno queens and from what I have seen like oversized turbos, so I would say for these people not to disconnect the IABs. But for people like me who like a more responsive, faster spoolin turbo, and who dont mind pushing more PSI to make power then I would lean towards (if a skunk2 manifold is not within the budget) disconnecting it cuz the IAB's should be a restriction when u start recieving boost in the low to midrange RPM. Just my two cents. good luck.

RudeLude

so i should just leave them as they are then, i'm not finished with my turbo setup yet, but i was just wondering if this would be like a little free power adder. thanks for the info.
daniel

Turbo92Si

Or even better, go Skunk2 IM

PHiZ

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18Flip &raquo;</TD></TR><TR><TD CLASS="quote">

how do you do that?

EDIT: i mean converting a p28 to control the butterflies </TD></TR></TABLE>

You add the circuitry to the ecu. Kind of like converting a non vtec ecu to vtec. (which hondata does when you buy ECUs, BTW)

-PHiZ


Modified by PHiZ at 11:06 AM 8/24/2004

Honda_Tengoku

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Turbo92Si &raquo;</TD></TR><TR><TD CLASS="quote">Or even better, go Skunk2 IM </TD></TR></TABLE>
this is where my vote is

boostinh22

go skunk2

crxste

Does anyone know how to add the necessary bits to a P30 ECU to enable IAB operation?

If not links would be great

Cheers