Blitz Nur Spec fitted but...

[mac79]

I have just had my exhaust fitted with a single pipe from the first cat back.

It sounds great but i feel down on performance. I seem to have to push the car hard to get it to boost, the gauge is reading right so do i need to fit a more free flowing air filter and give the ecu a reset?

I also fitted a HKS SSQV but the gauge is reading -0.8 at tick over and 0.8 on boost so i dont think there is any leaks with that.

Edited November 15, 2013 by mac79 (see edit history)

[Josh]

Since putting the second decat and restrictor ring back in, I've noticed it starts making positive boost at higher revs and under higher load than with just the second cat in. Maybe it doesn't, but it does seem to have made a difference. Maybe due to the difference in the restriction between the second cat and when the restrictor ring is fitted with the decat.

 

To add, I'm also running a Nur Spec R

[mac79]

When it was first done the revs were more responsive and it did feel quicker.

So maybe get a restrictor ring fitted?

[Josh]

When it was first done the revs were more responsive and it did feel quicker.

So maybe get a restrictor ring fitted?

 

Are you still running both cats? If the boost is staying at 0.8bar, then there shouldn't really be any change AFAIK.

 

You'll only need the restrictor ring if you remove both cats.

[mac79]

I have left the first cat in. The pipe is 3" back from that to the backbox.

[Josh]

I have left the first cat in. The pipe is 3" back from that to the backbox.

 

That's the most restrictive one, so it shouldn't really have made a difference changing the exhaust. You'll need someone more knowledgable than me now, as it may be to do with the BOV.

[mac79]

Thanks for trying to help.

[TBDevelopments]

reset the ecu and take it for a drive, see if you get any improvement.

 

Had this a few times with the Mr2's and the ecu's not liking the sudden change in the way the engine breaths. Goes against all logic or how it should work. But lets the ecu go back to its basics without any knock correction its had over the years and learns from a fresh

 

Worth a try.

 

Tim

[Pipedreams]

Maybe it´s just the lower back dyno foolin you With a free flowing exhaust you will build boost earlier and get a smoother powerband without a real kick in the back but you are moving faster earlier.

[mac79]

reset the ecu and take it for a drive, see if you get any improvement.

 

Had this a few times with the Mr2's and the ecu's not liking the sudden change in the way the engine breaths. Goes against all logic or how it should work. But lets the ecu go back to its basics without any knock correction its had over the years and learns from a fresh

 

Worth a try.

 

Tim

 

Do you think its worth dropping a blitz panel filter in as well before giving the reset?

We need to go out for a run at some point as well!

[mac79]

Maybe it´s just the lower back dyno foolin you With a free flowing exhaust you will build boost earlier and get a smoother powerband without a real kick in the back but you are moving faster earlier.

That does make sense it might just be that.

[TBDevelopments]

well ecu reset is only a 2min job anyway.

 

your only down the road from me aren't you? you should pop over one night your always welcome

 

Tim

[mac79]

I take it you are still working late down the unit?

I will pop over. I made need your bracket making skills to locate my bov.

[TBDevelopments]

depends on the day, usually till 6pm or tomorrow i'll be there late as have a rush job for a guy.