I would un-plan on doing the cam.. I've been told they don't really work on CFI (bad idle)

Really there isn't a great deal you can do to a CFI - I mean even if you spent $1000 and got a mechanic to do the MPFI conversion with good parts there isn't really much you can do that will give you the same cost/benefit

$1000 = 19kW (more commonly around $500 totalled)
You can spend $1000 on a full exhaust system or chip and not get that..

My 2 cents

Dan...

 

Burn it, and collect the insurance money. Not too expensive to do, and should get good results!!!

Seriously though, why dont you want to MPFI it? It gives better power for the same fuel economy...
Plus it's kind of pointless putting in a better cam with CFI

Other than that, I'd suggest a manual conversion.

 

For around 200 u could get MPFI parts and get around 15kws power extra. use the CFI manifold as a door stop hehe

 

Yeah as Gli 90 said - manual conversion if its auto.. Change diff ratio.. Stuff around with the air intake.. Full exhaust system..

And you'll have a car as fast as a stock manual mpi depending on the diff ratio... seriously..

Dan...

 

But then, having done all this, put the MPFI on it, and then you will have a car as fast as a MODIFIED mutipoint setup!
Getting serious for a second, why don't you want to put MPFI on the car???
It will give you more power than the exhaust, as Axeman has already said.

 

i would, but i am not to sure if the parts i get are any good and i am not to sure how much work is involved etc. IT IS A MANUAL. with a 2.5" exhuast system on it.

 

Doing the MPFI conversion is pretty well documented these days..

And for the cost that you would spend on extractors and cam (around $700 for parts + labour = ~$1000) you could get the conversion done for you with the doubtful parts being bought new... But if cost is the major concern (like me!!) then you don't have any real good options..

Dan..

 

I had the same hesitations about converting to MPFI as u do. However when i FINALLY found a cam available for the CFI I was quickly put off by the fact that even after purchasing it for $350+ I would still have LESS power than a completely standard MPFI'd 3.9
roughly $200 later and I now have an extra 19kw's and 27NM of torque to play with

 

we REALLY need to put together a guide on CFI->MPFI. we have lots of info, but its in so many places and so hard to find...

 

we REALLY need to put together a guide on CFI->MPFI. we have lots of info, but its in so many places and so hard to find...

It's my fault that we don't have a comprehensive CFI->MPI tutorial yet, because Karl and Scott Hart are going to convert mine when I finally get the rest of the parts I need. I've been really busy lately and haven't had much of a chance to check the wreckers. The tutorial will cover everything, and both Karl and I have digital cameras so nothing will be missed Stay tuned...

Ash

 

Hey Kenaz that sounds awsome. As soon as u put up that tutorial i'll be the first one have a crack at it.

P.S. give us a rough date to when u will have this tute up and running.

cheers.

 

Hopefully the end of this month

 

Change diff ratio.. Stuff around with the air intake..

what should us EA cfi people do for "air intake stuffing around" with... ?? hehe i didn't think there was much ya could do.. ??

how do ya change da diff ratio

the mpi conversion info sounds sikkkk guys!!
cheers

 

tubbyhippo, u can cut the top off of the snorkel to let in more air..

I did it, and while it doesn't necassarily give you more power, it does improve responsiveness and it revs a little faster too.. Give it a go, it's free too..

 

Like Karl said, should be by the end of the month, I'm getting my car back from the mechanic tomorrow morning (don't ask) and will check the wreckers around Bayswater before I come home. Hopefully with every other part I need in hand, fingers crossed...

Ash

 

are nz and scott willing to do another car?
im willing to pay for the help!!

 

My car is a 3.9lt CFI 3 spd auto but is a straight gas car, not petrol. About a year ago I was considering the CFI to MPFI conversion but stopped when I realised the Injectors don't actually operate on gas cos the system is pressurised. My parents EB Fairmont Ghia is also kept on gas for most of the time (4.0lt, 4spd, Dual Fuel) but is a lot faster, and sounds better. So I am not quite sure whether the MPFI setup would have any benefits. Any idea's? I know the extra capacity and tranny play a part but would it my car be the same by boring out to 4 lt and chucking in a 4 spd.

 

Im not sure but perhaps fitting a 4.0i LPG cam would be helpful

 

My car is a 3.9lt CFI 3 spd auto but is a straight gas car, not petrol. About a year ago I was considering the CFI to MPFI conversion but stopped when I realised the Injectors don't actually operate on gas cos the system is pressurised. My parents EB Fairmont Ghia is also kept on gas for most of the time (4.0lt, 4spd, Dual Fuel) but is a lot faster, and sounds better. So I am not quite sure whether the MPFI setup would have any benefits. Any idea's? I know the extra capacity and tranny play a part but would it my car be the same by boring out to 4 lt and chucking in a 4 spd.

The type of manifold you run on your car makes a difference even when you run LPG, talking from personal experience here.

The MPI manifold is a much better design, it flows better.

So basically, if you run straight LPG, there should be some gains, however, probably not as much as one running ULP. On the other hand, you won't need to pay for injectors(plug up holes), fuel pump, wire loom etc... simply because you don't use them for gas.

Should work out cheaper for you.. so it might be worth giving it a go... even if it's just for the induction note of the MPI manifold

 

The type of manifold you run on your car makes a difference even when you run LPG, talking from personal experience here.

The MPI manifold is a much better design, it flows better.

So basically, if you run straight LPG, there should be some gains, however, probably not as much as one running ULP. On the other hand, you won't need to pay for injectors(plug up holes), fuel pump, wire loom etc... simply because you don't use them for gas.

Should work out cheaper for you.. so it might be worth giving it a go... even if it's just for the induction note of the MPI manifold

Actually people probably wont (want to) beleive this but the cfi manifold is better for gas

And Jason, I talked to hart about yours and from the picyou sent there was a bit to be changed i think and the benifits of going to MPI gas so to speak would be nill. He recommended that if you use gas all of the time to leave it unless you wanna spend the $ convertng

 

GLi 90 did a tutorial a while ago, dunno if it can be dug up from the threads but he does still have the wiring diagrams etc I believe...

 

Actually people probably wont (want to) beleive this but the cfi manifold is better for gas

And Jason, I talked to hart about yours and from the picyou sent there was a bit to be changed i think and the benifits of going to MPI gas so to speak would be nill. He recommended that if you use gas all of the time to leave it unless you wanna spend the $ convertng

As I said, it is what I have experienced. Different manifold designs/lengths make a difference to performance.

The method in which LPG is delivered to the engine is similar to the way a carbie engine works... and it's common knowledge that manifolds make a big difference in those engines.... all along the lines of air speed etc.

Just my 2c Karl

 

i really want to give it a crack - i just need someone to help me get the petrol stuff up and going. ill work out the LPG later, im pretty sure itll be easy.. im more worried about the dizzy, getting the timing right, etc. and it looks like a prick to get at some of those manifold bolts!

Jase