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jollyjim81

Hi flow cat without a tune

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Hi anyone...first time posting here. I've got an FG xr6t with 150k on clock..I've had it for about 2 months now and feel it's down on power..I could be getting use to it but doesn't punch you back in seat as I remember...I've checked all intake piping and no leaks and also down the wd40 trick on turbo boost solenoid...I'm left thinking the catalytic converter has blocked up...I've been able to source a high flow one and plan to install but I am due to drive from karratha back to Brisbane a day or to after the hiflow cat has arrived. What are the likely consequences that I drive car without a tune from karratha to Brisbane about 5000km with hiflow cat in place?Ideally I would like to also do further modifications to the car before I had to pony up dollars for a tune as I plan on doing intercooler, boost and injector upgrades.

I'm dyslexic and cannot turn off simple functions in tapatalk

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Tighten your turbo and exhaust manifold nuts and bolts.

 

If you don't give it a hiding on your drive then it is likely that nothing will happen. You might get an engine light due to the rear O2 sensor reading differently from stock.

 

You can swap the intercooler and cat/exhaust without a tune but you'll have to drive off boost more or less until it's tuned. You can't swap the injectors or raise the boost without a tune.

 

You will be better off buying all your parts and then dumping it all at the tuners for fitting and tuning. That way you will only pay for one tune.

 

Go all out and do it once to save money in the long run.

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Thanks puff wagon..as stated I'm in karratha and no ford dealer up here but another agent that can source parts..thought should just go standard for drive back as maybe a couple of hundred... Ford cat converter he quoted $1600... WTF.. I clarified for half a meter of exhaust.... OK happy to go after market hi flow... thanks mate.

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Seems like a lot of hard work to me.

Just wait till ya get back to Brissy. Get a high cat there...

Or pop ya back seat down run the exhaust from boot through the car and out the passengers side window and wrap some duct tape around the mirror to stop it flopping around.:ermm:

Everything the Puff-daddy said is spot on the money...

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Doesn't really make a big difference if I get hiflow here or Brisbane as still reluctant to want to tune just for a cat replacement...also figure likely to get better economy driving back with hiflow cat as turbo working properly.

I'm dyslexic and cannot turn off simple functions in tapatalk

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You'll definitely get better fuel economy keeping it off boost.

Short shift, short shift, short shift all the way through the box.

5000 km and no boost. No overtaking

no give it a nice little gun out of a small town that doesn't even have a cop shop.

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I was going the top way too, through NT...open speed limits I think through certain parts... I guess the mods have started early than I expected.

I'm dyslexic and cannot turn off simple functions in tapatalk

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As has already been said, if you put the high flow cat in, then stay off the boost.

I am pretty sure that will be hard to do, especially if you have the urge to over take.

Now that you mention top speed runs..... I would be more inclined to keep the stock CAT in there and boost it as much as you can.

Might get it flowing again.... :P

Edited by masda74
spelling.

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Lol...OK sort of makes sense...I don't have the self control to stay off boost also... gives me time to get all the hardware I want and then get a tune.

I'm dyslexic and cannot turn off simple functions in tapatalk

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I'm in the same boat- except I had to do the cat replacement when my factory unit literally broke off- now learning to exercise a light right foot and it's harder than I thought it would be!
Also got the engine warning lamp as Puffwagon said.
Just waiting in line now for the tooooon to happen

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He was close LOL and I'm SO looking forward to it! Even though we're only going mild, it'll still be fun :beerchug:

 

 

@jollyjim81 yeah I thought mine might be too till it fell onto the ground - scraping my driveway everyday for 4 years I think just over stressed the flange crease and it cracked thru completely.

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How can a high flow cat install really endanger the engine? The turbo has boost control to avoid overboosting. How does it differ from putting a muffler delete pipe in which allows less exhaust restriction . 

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The factory "boost control" can only do so much. Overboost is possible with more flow than the other stock mechanical components can maintain. The stock GT3582R turbo (and the stock FG XR6T turbocharger, although not quite as capable) is far more capable than the other supporting stock parts.

 

The high flow cat increases flow of air away from the turbo much much faster than stock, whereas removing only a muffler just makes the car a little louder, but hardly increases air flow in comparison.

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The factory boost control is designed to work with factory parts and will catch the rising boost curve in time so it doesn't overboost. 

 

When you derestrict it with intake and exhaust mods the boost will rise quicker and earlier which the boost maps aren't tuned for. 

 

It'll trigger 'overboost' which isn't the end of the world but obviously should be avoided. 

 

You could swap various parts and just drive around it eg: give it half or 3/4 throttle without doing any damage but the proper thing to do is get it tuned. 

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There are a lot of strong opinions on this one all over the internet. From my experience with my car (BA with100 cell cat and factory tune) the factory wastegate setup seems to be fine at controlling the boost. It comes on a bit quicker but catches the rising boost ok.

Since the new cat back system went in in comes on boost a lot quicker (I was quite surprised at the difference it made - I wasn't expecting any) and peak boost is slightly higher before the wastegate catches up and pulls it back a notch. But can still get right up it and doesn't go over the factory boost limit enough to trigger a fault.

The only down side is that it feels like it just starts to rocket and then the wastegate trims the boost back to what the factory tune is commanding. You just get a half a second taste of what the car could be with a tune.

I bought the car at 130k, so of course it is possible someone has made a modification in the past that I'm not aware of. So your experience could vary.

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