Forced Induction Custom FI Setup Questions

FMU set ups - 85 CRX 1.5 GOING BOOST!

Old 03-06-2013, 05:41 AM
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Default FMU set ups - 85 CRX 1.5 GOING BOOST!

Hi everyone, done a fair bit of research into boosting my little Crx.

The engine is a EW3 (1.5 12VAVLE INJECTION)

I want to run seriously low boost - like 3-5psi

A few mains questions really.


Ive been looking into using a FMU (Fuel management Unit) - They come in either 8:1 10:1 or 12:1 Which would i need? Im already running a upgraded fuel pump (4bar)

Also, what should i do in regards to my adjustable fuel pressure regulator?

Ill be running a LC-1 with the car - i guess i should be running 14s the entire time?

What should i do with the dizzy - its a vac advance!

Also the MAP sensor? ive heard of something called the magic box?!

Thanks alot - car in question B)

Attached Thumbnails FMU set ups - 85 CRX 1.5 GOING BOOST!-d4510233-53f7-4dc3-9483-ee0181299846-2411-00000459e0af50c2.jpg  

Last edited by crx-ricki; 03-06-2013 at 05:55 AM.
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Old 03-06-2013, 08:32 AM
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Originally Posted by crx-ricki View Post
Hi everyone, done a fair bit of research into boosting my little Crx.

The engine is a EW3 (1.5 12VAVLE INJECTION)

I want to run seriously low boost - like 3-5psi
Ok, I'll assume you are looking for a tune that will just get it working OK on a low budget, instead of, say, converting to a standalone ECU and dyno tuning it.

Ive been looking into using a FMU (Fuel management Unit) - They come in either 8:1 10:1 or 12:1 Which would i need? Im already running a upgraded fuel pump (4bar)
I'd get one you can adjust the ratio on so you can tune as needed.


Ill be running a LC-1 with the car - i guess i should be running 14s the entire time?
14's off boost, mid to low 12's on it at the level you plan to run. 14s in boost worries me.

What should i do with the dizzy - its a vac advance!
You could simply back off the base timing, although off boost drivability will suffer. There's a couple piggyback timing retards out there like MSD's BTM that you could use as well, although they start adding cost.
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Old 03-06-2013, 12:11 PM
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That's a awesome reply thanks.

I did look into buying a standalone ecu however the price starts at 600 then all you have is a blank box! So 600 + hours and hours at a dyno having a map made from scratch... Too much for me.

How reliable would a FMC be? My car is a daily so it would be as simple as if if there's a possibility it could be a can of ***** then ill bail on all plans.
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Old 03-07-2013, 08:43 AM
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As long as you keep it out of detonation, it should be reasonably reliable at the small amount of boost you want to run.
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