Hey all. I am looking into a Civic and swapping a b18a1 engine into it.. (91 acura integra engine) I would like to run boost but was wondering what kind of fuel injector systems that these cars use.. Please don't tell me they are MAP That would be a major problem if it was..

Thankyou.
Jude

 

Every Honda car that i can think of has a MAP sensor. But...

www.zdyne.com has the absolute kickassest ECU ever made for 88-91 Hondas. check that site out, that will solve all boost problems, and allow infinite tuning.

 

You can run check valves, no big deal.
Or, you can go standalone.
I'm running DSM 450's and an AFC set to 40% fuel trim, which modifies the MAP signal enough that the ECM never registers boost, and hence no MAP sensor error code. It's good for about 9lbs of boost.
Oh, and if you go standalone, the stock MAP sensor is only good up until around 12lbs. If you want to run more boost, you'd need a 3Bar MAP.

 

what is meant by satndalone, and how do you "trim" the MAP? I thought of the check valves, But It would get a vaccume trapped in it wouldn't it? Please post a diagram...

Thankyou..
Jude

 

Standalone = standalone engine management. Basically somehting that replaces the stock ECM completely.
An AFC is a piggyback fuel controller that modifies the inputs to the ECM in order to add or take away fuel. The AFC happens to use the MAP signal to do this. It increases the MAP signal to make the ECM add fuel, and decreases the MAP signal to dial in less fuel. If you used 450cc injectors, you would need considerably less injector pulse to idle and run them without being overly rich. If you used an AFC to accomplish this(-40% fuel trim), you would be lowering the MAP signal by 40% at the same time, which gives you enough room to boost up to 9lbs without throwing a MAP sensor code, since the signal to the ECM is within spec because it is being lowered by 40%.

With check valves, you set them up like this:

throttle body
[]
|_
|_
|_
|
[]MAP sensor

| = vacuum lines

_ = check valves

Basically short sections of vac line with tees connecting them. The check valves go on the ends of the tees to bleed boost, and the MAP sensor is still able to read vacuum.

 

allrite!! I got the check valve thing now!! using > as the check valve symbol representing the flow of the valve, this is what I thought was ment...

[]-<--- {map}

now I understand that what was meant was

^ ^ ^
[]--I---I---I---{map}


Now that I've got this sorted out, how do I bleed the boost off of the MAP without loosing alot of boost out of the valves? This idea would bleed off some boost, But not alot.. isn't there somthing to go in the line before the bunch of T's? the MAP would read the same boost as the manifold still wouldn't it?

Maby I am missing somthing.. Where is the MAP on the honda engines? I know the ford MAP setup, which has the MAP threaded into the upper intake plenum of the manifold the opposite end of the TB.. is the honda's MAP there as whell, or on a vaccume line? I don't currentally own a honda (yet) but am gathering info cauz I want to build it and get it goin real fast!

Even better, Would someone be able to post a link of real pictures? That would help alot more I think..

Thankyou so much!
Jude

 

Hondas usually have the MAP sensor right on top of the t/b. The boost that's bled with the check valves doesn't really effect manifold pressure much, if at all.

This is my Missing Link alluminum check valve that I was using until recently:



The black thing on top is the MAP sensor, the silver thing in the middle is the check valve, and the t/b is on the bottom.