Boost Spike

[shaun123]

hey guys,

i recently changed my cat back exhaust (from a aftermarket 3" to a different 3"), left everything from there untouched (stock dump pipe). I was fiddling around to change my dump pipe and decided to leave it for another day as it seemed i needed to take the heat shield out.

In the process of trying to loosen some of the screws on the heatshield, i took off an earthing wire but then i put it back on when i gave up for the day..

my car has always held constant 0.5bar boost, now when i drive it, 5000+rpm or so, it spikes to 0.7bar boost? any reason why its doing this? any help appreciated...

The earth in question is circled red

Edited May 21, 2010 by shaun123

[Dose Pipe Sutututu]

completely normal, more exhaust flow, turbine spins quicker = more boost

[shaun123]

but i still have my stock dump pipe, wouldnt this mean that no matter how big the catback exhaust was, it'd still only flow to the stock specs?

I used to have a aftermarket 3" system on it before anyway, and i just changed it to another aftermarket 3" system...

[SargeRX8]

0.7bar wont cause any damage to your turbo or engine. Does it hit .7bar every single time you pass 5000rpm or is it random? Check the vac lines on the actuator make sure they're seated nice n tight.

[lachlanw]

its not a spike either

a spike is if you graphed it and the graph had a sudden rise then sudden drop eg a spike

and its normal

what are you worried about

and that earth has SFA to do with anything

Edited May 21, 2010 by lachlanw

[kwickr33]

why worry about 1.5psi? lol won't do any thing apart from a baby kick