I am not sure how to do this, any advice would be great. I am planning on removing the restrictor plate on my d15b1 in my 1990 Civic hatchback STD. If anyone has done this, what do you notice in terms of hp gain or anything? Thanks, again, I really dont know what I am doing so any advice would be excellent.

 

Anyone have any ideas, advice, anything?

 

Advice: If it were me, Id ditch that entire manifold and just do an MPFI swap.

 

you're not gonna feel anything on the butt dyno, as it's just a mesh apparatus that bolts right on top of the throttle body basically. you already have an air filter so there isn't technically a need for it.

Remove it if you want, but an mpfi swap would net you the 108 horsepower of the D16A6, and yes, you would feel that a lot more than with keeping the same throttle body, intake manifold.

Look up how to do this swap and other things about it in the FAQ section of the EF/CRX forum. Good luck!

 

leave it in lmao it will make ur car bog lol i did it it lost hp lol it dosent help because it makes the car take to much air in and the injecters cant supply the fuel do a mpfi conversion or a vtec conversion its worth every peney

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 89s1 &raquo;</TD></TR><TR><TD CLASS="quote">Advice: If it were me, Id ditch that entire manifold and just do an MPFI swap. </TD></TR></TABLE>

Just don't bother messing with it.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stockbee &raquo;</TD></TR><TR><TD CLASS="quote">you're not gonna feel anything on the butt dyno, as it's just a mesh apparatus that bolts right on top of the throttle body basically. you already have an air filter so there isn't technically a need for it.</TD></TR></TABLE> Correct

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by stockbee &raquo;</TD></TR><TR><TD CLASS="quote">
Remove it if you want, but an mpfi swap would net you the 108 horsepower of the D16A6, and yes, you would feel that a lot more than with keeping the same throttle body, intake manifold.
</TD></TR></TABLE> not correct. a6 has a different cam. Close to an a6 but not as good.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ***$nyper &raquo;</TD></TR><TR><TD CLASS="quote"> not correct. a6 has a different cam. Close to an a6 but not as good.</TD></TR></TABLE> What is the D15B7 for $200 $nyper?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dr_latino999 &raquo;</TD></TR><TR><TD CLASS="quote"> What is the D15B7 for $200 $nyper?</TD></TR></TABLE> I will shush

havn't messed with d series in too long

 

is it true you'll lose hp if u take the restrictor plate off?

 

What is true is that the engine only makes 70 hp at the crank back in 1990 when it was built.

That is ungodly weak. A geo 3 cylinder would probably rape you. My advice is to leave it the hell alone and save for a modd-able motor.

 

yea but removing a restrictor plate wont cost anything. Im just looking for a little more power in the mean time

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by scottso990 &raquo;</TD></TR><TR><TD CLASS="quote">yea but removing a restrictor plate wont cost anything. Im just looking for a little more power in the mean time</TD></TR></TABLE>

It will only hurt you. You will notice NO difference. Anyone who tells you otherwise does not know what they are talking about.

 

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

It will only hurt you. You will notice NO difference. Anyone who tells you otherwise does not know what they are talking about.</TD></TR></TABLE>


X 10, random removal of honda engineered parts does not make more power,

 

For what it's worth the DX and STD also had different ECUs, which must account for some of the hp difference along with the restrictor.

 

and the STD has weaker cams

 

You would notice more power through less weight after removing it, then by noticing how much more air it lets in.

If you want your car faster, start removing seats.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by scottso990 &raquo;</TD></TR><TR><TD CLASS="quote">and the STD has weaker cams</TD></TR></TABLE>

I've heard that the STD engine has a weaker cam than the DX engine, but I've never seen proof in specs, etc.

I believe I'll check the 1990 Honda Service manual and see if they list the lift/duration for the differents camshafts for the different D engines.


Modified by B18C5-EH2 at 1:28 PM 3/10/2008

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 &raquo;</TD></TR><TR><TD CLASS="quote">

I've heard that the STD engine has a weaker cam than the DXe engine, but I've never seen proof in specs, etc.
</TD></TR></TABLE>

Well what else negates the difference in power between the regular d15b2?

I thought it was just a different cam and different airflow restrictions.

Let us know your finds in the service manuals.

 

You don't have to take the plate off. If you wanna improve the HP you have to blueprint the plate opening the existing hole. There is a "strange layout" o'ring which board the beveled hole. Make it wider (close the 'oring).
The reason you cannot take if off is because you will not get full throttle. The plate is thick and will make the throttle cable shorter. The other reason why you cannot take it off is because there will be kind "a false air" and the engine will be running as if you hitting the gas and laying off, hitting the gas and laying of.... even when you parked.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jonnexport &raquo;</TD></TR><TR><TD CLASS="quote">You don't have to take the plate off. If you wanna improve the HP you have to blueprint the plate opening the existing hole. There is a "strange layout" o'ring which board the beveled hole. Make it wider (close the 'oring).
The reason you cannot take if off is because you will not get full throttle. The plate is thick and will make the throttle cable shorter. The other reason why you cannot take it off is because there will be kind "a false air" and the engine will be running as if you hitting the gas and laying off, hitting the gas and laying of.... even when you parked.</TD></TR></TABLE>

wow. All that is absolutely wrong......Way to start off in here.

 

Doing a DPFI swap on a 1.5. will not net the HP of a stock 1.6 MPFI D16A6, Who on earth thought that this made sense?

 

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

Remove it if you want, but an mpfi swap would net you the 108 horsepower of the D16A6, and yes, you would feel that a lot more than with keeping the same throttle body, intake manifold.

Look up how to do this swap and other things about it in the FAQ section of the EF/CRX forum. Good luck!</TD></TR></TABLE>

no the 1.5 wont put out the WHP that the 1.6 does, looks like you need to check it out.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B18C5-EH2 &raquo;</TD></TR><TR><TD CLASS="quote">For what it's worth the DX and STD also had different ECUs, which must account for some of the hp difference along with the restrictor.</TD></TR></TABLE>

I have a 1991 civic dx and a 1991 civic std. sitting in my front yard and they have the same ecu's. They are also stock so............

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ~sp33~ &raquo;</TD></TR><TR><TD CLASS="quote">

Well what else negates the difference in power between the regular d15b2?

I thought it was just a different cam and different airflow restrictions.

Let us know your finds in the service manuals. </TD></TR></TABLE>

YOU guys are forgetting the fact that the std had a 4spd. They are the same engine, different tranny and that makes the power difference. FACT!

 

from what i found, it stirs up the air to help it mix with fuel.
keep the strainer thing on, but remove the plate thing

will post pic shortly
(after photobucket is fixed)