Hello fellow 4G'ers,
I was wondering I have a 90 hb with DPFI and I had a friend give me the MPFI Intake. Is the power gain worth adding the new intake to the 1.5L ? If so I know that I need a pm6 ecu and a SI resistor box and to redo the wiring harness, someone told me I would need an SI distrubutor, do you know if there is any truth to that?
Thanks Guys

Thanks Alot, That webpage is really helpful. I found a SI ECU for $50. I'll write ya back and let you know how she runs.


[Modified by sk90civic, 4:21 AM 2/22/2003]

 

I think that it is worth it. I may have a si ecu i can sell you if you are interested let me know

 

hey, yeah changing from DPFI to MPFI I've heard is like the difference between night and day. It'll probably take you around 2-3 hours to do if you've never done it before and if you have read up on it and know what to do before you start. If you want, I just did a little write up on the parts needed, approximate cost for parts, and wiring a couple days ago. http://www.angelfire.com/d20/hcivic88/dx-siwiring.html

good luck if you decide to do it

 

Well by adding the intake you will have about the same power as the Si does so I would think it was worth it. Many people have said that it is the best mod for a DX is to switch it MPFI and also things like intake and exhaust will respond better with MPFI than DPFI. Yes it is true you need the Si distributor. You can do a search and find out what and how exactly to do it there are quite a few good posts with the info in it. Also this months Honda Tuning had an article on how to do it but there are 4 wires that were switched around in the article that someone posted on not too long ago.

 

It's soooo worth it. You'll wonder how you drove your hatch without it. If you need some pointers, or what not to do, check some of my archived posts back when I did it. Good luck.

 

ok nevermind found it


[Modified by DX_Tuner, 6:52 PM 2/21/2003]

 

it actually generates more hp than an si b/c the c/r is higher than an si's.

mpfi swap is a must for you. the difference is night and day


mpfi swap..... way over hp of an si now tho =P


[Modified by limoZeen, 5:02 PM 2/21/2003]

 

DO IT and you love it..if you don't love it...go back to being a DX and sell the parts..to some one who does..

I would higly recomend it..

 

The new Honda Tuner magazine has a How-To on DPFI > MPFI.

 

Just make sure it's not an HF intake. That would suck. What is the compression for the D15B2?

 

Fuel injected Si only 156 psi
Fuel injected all others 185 psi (D15B2)
info taken from quickhonda.net

 

It wil not make more hp than a si..the diff in compression isnt enuff to compensate for the std/dx cam and smaller displacement also the std has the crappy exhaust manifold...mods will respond better to mpfi over the dpfi..it is worth it...I just didnt want to you to be misinformed that a b15 with just mpfi swap will have more hp than a d16a6

 

I thought the DX dizzy was missing the TDC sensor, not crank angle.... Right?? If I am right Hcivics write up is wrong....


[Modified by mr. skelly, 3:06 PM 2/22/2003]

 

it has been proven that an mpfi swap on a std or dx *will* beat an si. weight is a factor, compression is a factor. while the std can dx cams are not as agressive in their profiling, they have power bands in different locations which makes up for the excess power generated by the si cam in general. the std exhaust manifold is more restrictive than the si's however it is not restrictive enough to make you lose to an si...... its funy that you brought this up, as you stated the std cams suck thus expelling LESS exhaust than an si's.

also displacement is hardly an issue. w/ the d15s

the dx/std dizzy is missing a crank angle sensor.

sidenote: mpfi swaps on ANY car that is dpfi is a dramatic increase in power. some turbo aplications will see gains upwards of 50hp (ie mitsu starions) simply b/c of a multiport swap.

you'll see that im saying after youve done it

sidenote2: with a mpfi swap, short ram, axle back exhaust, the rear section of my car gutted, and an si trans, STOCK cam, STOCK exhaust manifold, i was able to keep w/ b18b 4th gens hatches (we were dead even actually). id really like to see an si w/ 50 less lbs, a short ram and and axle back do that.


[Modified by limoZeen, 5:42 PM 2/22/2003]

 

can anybody else confirm this? let me know if my info is wrong so that i can change it before anyone else gets confused


[Modified by Hcivic88, 5:16 PM 2/22/2003]

 

nope buddy u are wrong
on my old STD , i had a crank angle sensor code.. and it limited my rpms to only 3500 .......
the STD/DX missed the CYL sensor

 

Ive heard that the DX engine is more powerful with MPFI than an si engine is, but I still dont belive it ... I wanna see some numbers

 

I dont know if it'll be more powerful, the DX with MPFI does have a higher compression ratio, although the Si has a heavier cam. although a DX may be faster than an SI because of weight differences.

also, about the crank angle sensor. I know that the DX has one, but isnt changing the wires from C1 and C2 over to B10 and B12 for the crank angle sensor? then the extra wires that are run for the cylinder sensor?


[Modified by Hcivic88, 7:38 PM 2/22/2003]

 

Man, your article was really helpful thanks!!

 

I'm guessing that you're talking to me??
if you are, no problem, i just gathered info from a few different sites and magazines and put them together in easy to read format. good to know it helped somebody out

 

I'm pretty sure the DX dizzy is missing the TDC sensor. Thats the only diff....

 

if u can do the wiring it is, if u have to pay someone it wont be.

 

i did the swap two weeks after i got my dx after that i did a header and exhaust.. the little bit of mods i did. made such a big diff i would say do it as soon as you can.

 

I stand by that the d16a WILL still make more HP than a b15 with mpfi and will be faster...The si may weigh 88lbs more than say a crx dx but the Si trans is geared way better..Thats why a DX trans and zc in a std will still loose to a si..the diff in compression is only about .5 which is not enuf..a general rule of thumb is you only gain about 2hp per piston with a full point of compression... and if any of the d15 did make more hp than a si it would be the 88std since it has the most...plus cam is the heart of the engine...the si cam is more of a perfomance cam and dx was designed for gas mileage..the d16a6 responds better to bigger cams and turbos since it has a lil more displacement..I still agree it is worth doing the mpfi swap on the lil 1.5 just dont expect your 4 speed hatch to whip on a Si even a dx with mpfi will not beat a well tuned all stock Si..If you own a DX with the 1.5...I really encourage you to drive a Si you will be able to tell the diff..I own both

 

whoever is saying that a mpfi dx will smoke up a stock si You are smokeing the rock there is no way my si had 201000 on it before i took the motor out (a6) and it smoked like a bitch but i still smoked 2 dxi's like a month before i took it out and they couldnt touch me your deff smokeing the rock man

and fullMetalJacket,
i agree with what you said about the si except the 2hp per .5 compression are you freeking nutts??? you cant say "generaly 2hp blah blah" there is no general comparison to hp/cr you need to lay off the crack pipe that totally depends on the motor and mods and begining cr exc... the only way to a fast na car is c.r. how are you suposidly to make any na car fast without seeing massive gains due to compression?? some neon wiper nozzles or glowing exhaust tip??

oh by the way sorry to be kinda mean about it

-larry