how far can i stretch my egi? :confused:

[alistair bridge]

Having just bought my car on ebay for not a lot of pounds and pence i'm planning a few mods. simple stuff like removing all emissions gear air pump cats the lot and puttion a cold air induction set up in.

How far can i take the standard ecu+injectors. i have heard that there is a lot of power to be gained but need to know that i can supply enough fuel. can i just fit larger injectors? does anyone know of a good place to get injectors cleaned balanced and blueprinted? or should i just buy new ones. help please...

alistair

almost forgot the car is gen2 1989 N/A

[bill shurvinton]

You need to be a bit more specific on that one. the stock computer has only been cracked by 1 US tuning firm, so if you are after serious power (230 ish) you need aftermarket IMHO.

To put it in perspective. A friend in Florida has just popped a 50DCOE throttle body on a 12A and added an £80 home brew EFI computer. He is now doing 0-60 in 6.3 seconds on stock internals.

But let us know what you are trying to do, what you can do yourself and how deep your pockets are .

Bill

[alistair bridge]

i'm still a student so funds are quite tight, having said that my car was only 250 quid so have a bit of money to tweek it with. I can easily afford a new manifold RB etc and will be making my own custom exhaust which will be much less restrictive than the knackered cats i have at the moment. i will also be making a heath robinson (but massive) cold air induction system. ihave heard that these mods with standard internals can make 210bhp.

I need to know if the ecu can supply enough fuel. ireally dont want carbs. i've had problems with them before and like the idea of a reliable, consistent system.

Is anyone out there making reasonable power out of the standard set up? (ie 200+hp)

the 80 quid homebrew sounds like fun though

[bill shurvinton]

OK we have a starting point. Couple more questions

1. Where are you based?
2. What is your electrical knowledge (i.e. which end of a soldering iron gets hot etc).
3. How much of a sense of adventure do you have

Certainly 200 is possible from a 6-port with just exhaust mods. I am trying to get hold of the results from racing beats recent tests of a ported engine. On carbs they were getting 220, so I would expect just shy of 230 on EFI. These are engine dyno figures so trustworthy.

Bill

[alistair bridge]

based in birmingham uk. electrical knowledge is ok :). (currently doing third year of engineering science at oxford university) I can learn very quickly.

As for sense of adventure i only paid 250 pounds for my car so i'm pretty much up for anything that doesn't cost lots. if it all goes wrong i'll stick a carb on it sell it and buy another.

[bill shurvinton]

Aha. we have something to work with then. (Cambridge meself)

You have a couple of options available to you. We can either discuss these on the forum or if the moderators prefer, off-line it until we have something up and running.

Certainly you can use the stock computer for spark and concentrate on fuel for a while. There is evidence that more advance at lower RPM is helpful, but no empirical data to back this up.

On the fuel front there are 2 computers I am playing with

First is the megasquirthttp://www.bgsoflex.com/megasquirt.html . This is the £80 build it yourself one. Laptop programmable, very flexible, but fuel only. My westfield runs this for fuel.

The other is modding a junkyard GM unit. Have a look at Robin's page of stuff. We did an ignition conversion on his X-flow over christmas.

http://www.furyworld.fsnet.co.uk/GMECM.html

I am currently working on an adaptor so you can do fuel and spark off a mazda CAS. I have full source code for the ECU to add trailing spark control. This is more work but ultimately has far more IO potential.

Bill

[Glenn Butcher]

Hi Bill/Alistair!

Please keep this on the Forum - would be very interested to see what you end up doing.

[bill shurvinton]

I'm a little tied up for the next couple of days as I am building up a wideband O2 controller for Pip and then I have to get at least one car back on the road.

In the meantime start thinking about goals for the project

1. What are you optimising for
2. Do you want to keep it 'stock looking'
3. Fit and forget or inveterate tweaker.

As I am an incurable tweaker, this is a vital question to ask.

I'll get back with a treatise as soon as time allows

Bill

[alistair bridge]

the megasquirt system looks good. generic and simple. to make the most of it i would probably have to make up some throttle bodies? and there are ways of changing ignition timing on the stock system. i saw a superchips icon box on ebay for £40...

Progress may be a little slow at the moment for me too as i have finals part one this year and am supposed to be working hard for them.

Things i am looking for are a clean free revving/breathin powerful naturally aspirated system that will not give me a headache when i want to change my setup. I do tend to fiddle with things once i have them but don't want a system that needs constant attention.

I like the idea of being able to swap fuel maps when i want to and simply because it is cheap it gets my vote.

shall i order my bits now?

cheers

[bill shurvinton]

No Rush,

as there are plenty of other things to sort out. Also it would appear that parts ordering is about to get little easier.

Hopefully on monday there will be a fax waiting for me with some useful info. There is a mag in the USA called Drag Sport Racing which has been running a set of articles by the racing beat crowd on how far you can push a 6-portwith both carbs and EFI. With 50DCOE TBs peak was 226 BHP. but the side draft dellorto actually had a better power curve below 6500. A lot of this is due to tuned lengths, but throttle diameter will be part of it.

The 226 figure tallies with some numbers from Rob Goulden at Pineapple racing, but only if everything is spot on.

What i would do is see if you can find a junk lower manifold to play with. I've got an old weber adaptor that may bolt up, but you will have to decide how you do the port actuators.

Bill