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Hi guys newbie wanting more power


Barracitric

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  • Puff
  • Gold Donating Members
  • Member For: 9y 1m 28d
  • Gender: Male
  • Location: South Australia
2 hours ago, Puffwagon said:

It's hitting the overboost threshhold.

 

The tune is holding it back. You can't get any more out of it without a tune.

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  • Gold Donating Members
  • Member For: 8y 11m 6d
  • Gender: Male
  • Location: Canberra ACT

These guys are telling you two things:

Firstly, our cars have full electronic boost control, managed by the ECU. A manual boost controller will trick the wastegate into allowing more boost, but the ECU will still see that boost via the car's boost pressure sensor. If the ECU sees more boost than what the ECU is commanding ("overboost") by a certain threshold, the ECU will shut the fun down. This is what is happening to you. In these cars, a manual boost controller is of zero benefit. You need to have the tune in the ECU edited to command more boost, which it will do with the existing hardware (ie without a manual boost controller). Also 10 psi is getting very marginal for the factory fuel pump and injectors and if your ECU had allowed that boost and not shut you down, you might be shopping for a new engine now as you would have been dangerously lean.

Secondly the plugs in and of themselves do not make more power. At higher boost levels, the boost blows out the spark with a large gap, which causes a misfire. Closing the gap sorts this out, as the spark has a smaller gap to cross and is therefore stronger and more resistant to blowing out. The smaller gap allows you to run more boost without blowing out, and therefore make more power. If the spark isn't blowing out, then smaller gaps won't make any more power.

Hope what we are saying is helpful.

You basically need to decide whether you want to do some more mods and tune all at once, or just tune now on the factory hardware. I tuned my BA for about 9 PSI with a cat upgrade and bigger fuel pump. That was noticeably better than stock but nothing mind blowing.

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