Help me with my boost

[Catfish]

Noone, are you still running the N249 bypass, and have there been any issues?

[noone]

Still bypassed, but will put it back as the N75J worked a treat for me.

I'm not 100%, but I think that both the N249 bypass and N75 change are trying to fix the same issue on chipped cars (electronic boost dumping when you don't want it).

I think the bypass is a good, quick way to see if it will fix wavering boost.

[Blitzen]

I personally think its a safe thing that it isn't peaking to 22psi. 17psi is high enough I think.

[vwthunder]

I personally think its a safe thing that it isn't peaking to 22psi. 17psi is high enough I think.

Really, is your car chipped, I hear most of them run about that, well peak at around 22PSI

It feels slow at around 17PSI

[Blitzen]

Really, is your car chipped, I hear most of them run about that, well peak at around 22PSI

It feels slow at around 17PSI

Yeah, mine is chipped.

[noone]

As the turbo uses the exhaust gasses to compress fresh air, I'm assuming that boosting over the turbo's efficiency range may actually not yield more power?

[vwthunder]

As the turbo uses the exhaust gasses to compress fresh air, I'm assuming that boosting over the turbo's efficiency range may actually not yield more power?

I can tell you the car makes a lot more power at 22Psi than it does only peaking at 17

[Blitzen]

I can tell you the car makes a lot more power at 22Psi than it does only peaking at 17

When it starts punching holes in the pistons you won't be going anywhere too quickly...

[vwthunder]

When it starts punching holes in the pistons you won't be going anywhere too quickly...

Haha. I am sure there are a lot of people going around in chipped polos here.
Maybe because you dont have a boost gauge your not sure of how much boost your actually running

Can some other people with chipped cars and boost gauges help me out here

[Petrina Polo]

That is no bunnings valve you salad makers.. lol

That is an industrial air tap capable of holding over 150psi...

Instead of removing it, just leave it open as the internal diameter is the same as the stock hoses... No need to remove it... it wont leak as its good for 150psi.. Its not pretty but its effective..

Basically does the same thing as the festo valve.

I noticed with the stock N75 that if it was closed too much the ECU would bleed all boost through diverter valve..

With the N75J, you could just about close it off and the car would boost to 22psi+ and go like a rocket..

I also did notice that with the N75J, with the valve open it would only boost to 17psi..

I think that if you want more boost keep the stock N75 valve in and it will boost to 22psi (spike) and stabilise to about 18psi..

The N75J seems to boost less with the valve fully open.. hence the use of the air tap..

[bfeboi]

when i first drove my car i was cheering for weeks. then when i fitted a boost gauge i was surprised it spiked at 22psi then settled around 15-17psi. later i fitted a forge front mount and it smoothed out the power. it now spike to 18 psi and settles to 14-16psi

still alot of fun

[Petrina Polo]

Maybe they were too tight to chip it properly?

Gavin

The car has APR program... not chipped properly?

[vwthunder]

That is no bunnings valve you salad makers.. lol

That is an industrial air tap capable of holding over 150psi...

Instead of removing it, just leave it open as the internal diameter is the same as the stock hoses... No need to remove it... it wont leak as its good for 150psi.. Its not pretty but its effective..

Basically does the same thing as the festo valve.

The N75J seems to boost less with the valve fully open.. hence the use of the air tap..

I removed it totally and the car is now only boosting to about 17Psi

Maybe I need it back on, one thing, who put it on and whos idea was it Petrina, is it cheating running 22psi lol, if the APR flash is not meant to run that high

[Petrina Polo]

I removed it totally and the car is now only boosting to about 17Psi

Maybe I need it back on, one thing, who put it on and whos idea was it Petrina, is it cheating running 22psi lol, if the APR flash is not meant to run that high

The stock N75 will bost harder... I installed it myself on Plautos suggestion...

The APR program does run that high with exhaust and intercooler mods, it just spikes and drops to about 18psi (stock N75)..

The N75J doesnt boost as hard but its more controlled..

[Petrina Polo]

when i first drove my car i was cheering for weeks. then when i fitted a boost gauge i was surprised it spiked at 22psi then settled around 15-17psi. later i fitted a forge front mount and it smoothed out the power. it now spike to 18 psi and settles to 14-16psi

still alot of fun

See... your boosting in basically the same manner (without air tap).. all the air tap is doing is slightly delaying the dumping of boost as N75 receives signal slightly later... its not running more boost... just the same boost a little longer and more smoothly..

Plautos even had dyno graphs proving it was smoother..

The stock N75 is known to fluctuate boost a little under chipped cars. the air tap stabilises it a bit..