fiestaturbo.com

[chris@vortech]

As above really i bought Megasquirt v2.2 a few weeks back to replace my OFAC management on my efi XR2 turbo. However recently im getting fooked off with the car being off the road (3yrs now!) and am toying with leaving the OFAC management on there and just drive the thing!! With my current setup is there much benefit changing to Megasquirt? I'd imagine the car is around 200hp as it stands @ 14psi and its a handful as it is keeping it in a straight line! I've only ever driven it at Brunters a few months ago and apart from a smokey turbo (which has now been replaced!) it was faultless!!

The engine spec is:

1650 CVH
Cossie T3 turbo with 360 thrust etc
Fully balanced and blueprinted
Blydenstein gas-flowed cylinder head with silicon valve stems
Low compression pistons (7.0:1 CR)
Escort Cossie Group A K&N Filter
Ahmed Bayjoo Phase2 conversion (OFAC)

Car in question is:




Any advice would be great.

Cheers
Chris

[GavStyli]

thats really a question for the mapper.
obviously less hassle for you if u leave the ofac in there and just leave the phase 2 chip in, but u wont be making the most of your mods.
your also limited to 1.1 bar boost, so if u want more power megasquirt is the way to go
if its running fine, leave it as it is until u get bored of the power and go from there

[heeman10]

I'm with the hairdresser on this one Chris. You don't say what internals you have, but if you've gone as low as 7.0:1, 1 bar is hardly any boost to be putting through it and it's almost a waste of such a low compression ratio and the dull off-boost performance won't really be matched by what should be back-shoving on-boost performance.

As Gav says, you can only really run about 15psi on OFAC safely, so the Megasquirt would allow you to get that figure up (if your turbo can produce more?). If your turbo can't really push past 15psi anyway, you don't plan on upgrading it (and perhaps your internals aren't up to much more than 200bhp either?) and you don't want more power, then stick with the OFAC.

[sailorbob]

I thought Stu at MSD can get around the OFAC boost limit now?

[heeman10]

I'm not sure which way you mean precisely Mr Sailorbob, but one thing he has done is to set the fuelling and timing extremely safely at the OFAC MAP sensor's limit, meaning that once the sensor stops sensing increasing boost pressures, the fuelling and timing are still good for higher boost levels. I don't know how far he's pushed past 1.1 bar, but I'd guess he won't be exceeding 20psi boost spikes. Yes, it'll be rich up until 15psi, but at least then it'll safely boost to higher pressures.

[sailorbob]

I'm not sure exactly what's done to get over the limit, I was hoping that he had found out where the MAP_Transfer_Table and limits are in the code so that he could use a bigger range MAP Sensor to allow more boost. Hopefully he's not relying on speed density calculations to up the boost, to do this and have boost spikes above the limit he would have to disable the overboost protection routine. (Maybe he'll see this thread and enlighten us )

[chris@vortech]

to be honest im not sure what internals the bottom end has. I bought the engine some time ago from a chap off of here (cant remember his username but it was from the frst with the audi door handles, leather interior etc etc - quite a regular at the time).

Chris

[georob]

No idea about your quey but your mk2 looks AWESOME!!!!!!!!!!

[heeman10]

Hopefully he's not relying on speed density calculations to up the boost, to do this and have boost spikes above the limit he would have to disable the overboost protection routine. (Maybe he'll see this thread and enlighten us )

Yep, the overboost limit will be removed, as with most chips. Boost will be set as usual, and he maps it to be safe at the maximum boost levels. From that point down to 1.1 bar it'll get a little too rich, but once the manifold pressure gets down to within the range that the MAP sensor can read, things are controlled as usual.

Chris - Sounds like you have JJ's engine, drop him a PM if you're unsure

[chris@vortech]

yeah thats his name I remember it now!! Had the euro look mk3 which I bought off of him as a donor car.....

I did pm him a while back but not sure if he comes on here anymore!

Chris

[frostie]

i would go too megasquirt the possibilities are endless and cost next to nothing