Exhaust Restrictions

[blackwrx]

Modifications I have so far:

APS power pipe with blow off valve

2.5 inch exhaust from cat back

walbro fuel pump

tuned with a CAPA flash tuner.

I have been to see the local work shop who does dyno tuning as my current tune has a problem and the fuel consumption is going up and up.

I have been told I would not be able to get over 260 hp at the flywheel but I am fairly positive when my car was tuned before I had 260KW at the wheels.

Now I have bigger injectors I would like to get them fitted and get it retuned, but I have been told it is a waste of time as I need a new exhaust either 3 or 3.5 inch to allow me to get any more power out of my car.

The question I have is do I need to upgrade my exhaust to make it worth while fitting the injectors / retuning my car? I dont want to go over 300 rwkw.

I may need to send my Flash tuner away for a new tune / is this an option as I do not see myself getting back to perth in the near future?

Thanks

[ZAP]

The Exhaust is good for 300rwkw.

I would check the CAT as it may have melted. If not find a better tuner

[blackwrx]

not many tuners in kalgoorlie, and I dont know when I will be able to get it to perth. I think I would be happy with about 300kw. Just need to find someone who will do a tune for me.

[G6ET8U]

Has the car now got a single 2.5" exhaust on it?

Or is it twin 2.5"?

Jack

[muzza420]

I think the best way is to speak to another tuner and see if they can sort out a solution, Maybe you can send them your box. Now since your near Perth I will recommend Simon from Xtreme Ford Tuning, on this site As Xtremef6.

Is the CAT standard factory?

[blackwrx]

yep my exhaust is a singli 2.5 inch exhaust with the stabdard cat.

Simon tuned my car before and I was very happy with the job he has done, I am not sure if he would like to do a tune for me without roadtesting the car though, but I will ask.

Thanks.

[JimmyXR6T04]

260hp at the flywheel?? don't go back to that shop that's means they don't expect your car to get more then 193kw at the fly?? it would have that at the wheels standard.

[JimmyXR6T04]

I'm sure Simon won't mind doing a mail order tune, just ask him. He's provided a few for me, and I just use a local dyno to run the car and check afrs etc, then I email the graphs to Simon so he can check them out and see what needs doing

[gogo]

yep my exhaust is a singli 2.5 inch exhaust with the stabdard cat.

Simon tuned my car before and I was very happy with the job he has done, I am not sure if he would like to do a tune for me without roadtesting the car though, but I will ask.

Thanks.

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No wonder you can't get much power - put the stock exhaust back on - this is twin 2 1/4 and should flow much better than a single 2.5!!!!

If you are replacing the exhaust you need 3.5 minimum (even 3" as our indiicated is going backwards relative to the stock system), or twin 2.5's - standard cat is usually the restriction, but in your case you might have a whole new level of restriction - so to answer your original question, yes IMHO you would be well advised to replace the exhaust before fitting the bigger injectors - otherwise I beleive you are wasting your time.

Until you get the stock system (or something that will breath a lot better than a single 2.5) back on you will find it much harder to make good power - this will also stress valve springs and have other ramifications...

Best of luck!

Ben.

[gogo]

260hp at the flywheel?? don't go back to that shop    that's means they don't expect your car to get more then 193kw at the fly?? it would have that at the wheels standard.

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I expect the exhaust as indicated will be a MAJOR hurdle to making any sort of power - including matching stock power levels...

New exhaust time or re-install the stock exhaust with a good cat - this will flow enough for 300rwkw. If you are chasing that sort of figure I would highly advise getting valve springs - I am supprised you have not had major issues with these given your current exhaust...