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Old 06-07-2004, 20:37   #1 (permalink)
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So many questions

I don't know where to start... first can someone explain the role of the EECIV and EECV, which E series had what on them... are they interchangeable at all?
Next.. are there any aftermarket 4v heads for the E series sixs? if so how much do they cost and is it worth it?
What are some of the cheapest quickest easiest ways to gain some extra Kw from the E series? what are some of the more expensive?
say you have a 4.0 litre six..... how far can it be bored and stroked and how many more litres can u expect to get from it?
Does anyone kow a site which explains what the gear ratios and diff ratios are? all i see is 3.5:1 and stuff like this.. i have no idea what this means.
Lastly (for now) how much power can be pumped from a 4.0L while keeping it naturally aspirated as well as cost efficient. eg not spending 40k on it
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Old 06-07-2004, 20:45   #2 (permalink)
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Re: So many questions

EECIV and EECV are the engine control computers

EECIV was EA to ED
EECV was EF/EL

Main difference was the EECV is able to control a BBM (Broad Band Manifoldm, has long and short runners), were as the EA to ED had fixed length runners.

Diff Ratios are in simple turns the number of turns the wheels will do compared to the tail shaft, so 2.77:1 meand the wheels have done 2.77 turns and the diff 1 turn, so the high the number the more the wheels turn per tailshaft turn, hence the faster you can launch - strangley the high the number the lower the ratio so 3.45:1 is a low ration and 2.77:1 is a high ratio (that i know, why though I have no idea).

If you change the diff ration just bear in mind that the speedo will then be wrong, and a new speedo gear would have to be put in to correct the speedo, unless you change to a really low ratio like 4.11:1 in which case a little black box would be needed to convert the speedo signal as no speedo gear exists to correct for that ratio.

eafalcon.com has alot of specs that might help.
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Old 06-07-2004, 20:56   #3 (permalink)
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Re: So many questions

Other way round Dellboy. When the tailshaft has turned 2.77 times the wheels have turned once. So the lower the diff ratio i.e 3.45:1 means it is easier for the engine to turn the wheels, but this compromises highway rpm and top speed. So you have to figure out exaclty what you use your car for. There is no point putting in 4.11 diff gears in if you spend a lot of time travelling.
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Old 06-07-2004, 20:57   #4 (permalink)
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Re: So many questions

What are runners?
are the EEC's interchangeable, which is better?
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Old 06-07-2004, 22:01   #5 (permalink)
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Re: So many questions

DOH , always get one part of that diff story wrong somewhere ... hehehehhehe

runners are the intake part, the long tubes letting air into the engine.

Yes you can interchange EEC's, but no gain to be had, unless you get a matched XR6 cam and EEC, or install BBM in which case an EECV would make life easy.

They are different EEC's for manual and automatic as well.

Jason
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Old 06-07-2004, 22:39   #6 (permalink)
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Re: So many questions

an inlet manifold is made up of 3 parts

the flange:- where you bolt it to the head.. has holes that match the ports on the head

the runners:- as Dellboy said, the tubes that carry the intake charge into the head

the Plenum:- used to distribute the intake charge evenly into the runners.

the EF EEC is not interchangable unless you want to run the coil pack on your engine

The BBM mainifold is a feat of engineering in the fact that there is a set of butterflies inside that route the intake charge depending on RPM..
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Old 06-08-2004, 00:21   #7 (permalink)
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Re: So many questions

well thanks for sorting out the diff part.. im stilll learning...... now how about the bore and stroke sizes for the sixes?
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Old 06-08-2004, 01:14   #8 (permalink)
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Re: So many questions

no real point stroking the 4.0 six, there big enough. most people just get there 4.0l's mildly ported, cam and a decent exhaust. but id change diff gears to 3.45 LSD first. changing the Cam to an EF one is a cheap and easy mod (providing youve got a tourqe wrench) and the benefits wll be noticeable.
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Old 06-08-2004, 05:11   #9 (permalink)
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Re: So many questions

Torque wrench........pffffffffttttt!!! lol

I put my EL cam in my EA without one. Took the rocker cover off to remove it and all the rocker pedestals were cracked from being over-tightened!!

Hmmmm..........me thinks torque wrench is good idea. Hehehe.
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Old 06-08-2004, 06:26   #10 (permalink)
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Re: So many questions

haha same thing happened to me when I changed my cam.

SOMEONE over torqued the rocker cover bolts when they put the EF rocker cover on.....

$32 bucks later my pedestals aren't cracked, but the replacement lifters tick their nuts off. :(
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