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Overboost


senna_T

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  • Member For: 17y 1m 21d
  • Gender: Male
  • Location: SW Sydney

hey I only just caught up on this thread!

Azid Rush, yes it will overboost with a gutted cat, this is the same as deleting it all together

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  • Member For: 18y 4d
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on my car I had a plazmaman stage 1 kit with the stock zorst, it ran 211.5 rwkw on the factory tune and having 4.8 psi. cv dyno.

this kit has the underbattery pipe and all the xover removed and replaced with big pipes.

as soon as I started modding the exhaust I found that on the stock tune it would hit 8 psi and cut out.

running my custom tune it hit 18 psi spike. up from 14. after zorst mods.

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  • Member For: 18y 4d
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to add more.

I can now, with a high flowed cat and plaz 800 kit , run 14 psi with no spike or fall off but if I add more boost it spikes and falls away to 14 again.

I now need to mod my wgate and actuator to get a solid 15 psi.

Edited by BFHOON
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  • 3 months later...
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what are the fines with gutted cats??

and how are they checked??

the fines for a gutted cat are about 10k, checking them is not easy if the cat is simply gutted epa could tell but your average joe blo policeman would be hard pressed to tell the difference

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  • Member For: 16y 11m 12d
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I wouldn't be too sure, you can feel strong smell of petrol. and if mr policeman knows what it means he will call in someone who can tell.

But even though I'm against this mod I have to say that I haven't heard of anyone being caught.

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  • 5 weeks later...
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  • Member For: 20y 11m 2d
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Well, in the earlier BA days cars started to develop a problem of boost cutting when accelerating hard. Most people found this out when trying to overtake.

My old ute when 100% stock did this fairly frequently.

When I added a CAI then did it everytime the accelerator was nailed.

Ford revised the PCM calibration and eventually got it right after a few attempts.

It's possible that people who experience this still don't have the latest calibrations.

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  • 5 months later...
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  • Member For: 16y 3m 9d
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  • Location: newcastle

interesting read. heres what I have found.

big cooler relocated fillter to r/h spotlight 3inch pipe from turbo to t/b stock exaust no gutted cat nothing.

and 8psi generic holds 8psi perfect no overboost no other mods. cant see how intake mods would make a diff if any,could someone shed a bit more light on this.

however I can understand exhaust mods creating overboost.

Edited by bda12pleaseu
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