why is the d15b2 rated at 90hp and the d15b1 rated at 70hp whats the difference between them.

 

the restrictor plate is under the throttle body cover right. cuz if it is i took that out so all i would need is a d15b2 cam and ecu and i can gain 20hp in theory?

 

I've never heard of the restrictor plate b/c i rock b-series.
So i searched restrictor plate. Check out 91civicdxdude's post.
https://honda-tech.com/zerothread?id=636167

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

 

huh i forgot all about the mpfi duh. well since my dad got a pick up now ill have to start going to the junkyards down in baltimore.

 

i have a d15b1 but i dont have that "turbo manifold/cat combo", thats wierd so i should have like an HF exhaust manifold.

 

i thought the b1 was carbed.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by pSI civic &raquo;</TD></TR><TR><TD CLASS="quote">i thought the b1 was carbed.</TD></TR></TABLE>

The d13a2 (not a typo) made in 1987 was the last carbed civic motor. The fuel pressure is 3 psi. It used a mechanical fuel pump.

 

i thought there was 1.5l with a carb to. oh well nvm.

 

You are correct. They simplified everything for the 90-91's and stopped making that header-cat combo for the Sexually Transmitted D-Series a.k.a. D15B1. However, the engine did not change so you can put the 90-91 cat-under-the-car style on your 88-89 although it doesn't make a difference in anything.


i have the b1 but from 88



My b1 has the turbo-looking manifold too. And boy does that cam stop making anything happen after 6.2k. OOOO boy. ::dies::