Anyone got wastegate flutter?

[Cupraken]

Hi all, got this weird noise between 3500/4000 rpm, ie when the boost kicks in on my car. Best described as ffttt ttt ttt tt ttt ttt t a bit like an old VW Beetle exhaust! Goes once thru this rev band and doesn't seem to affect the power delivery, dyno graph shows no glitches there either, nor vag-com. It's always been there despite 3 different maps, had the revo boost turned up last week and it may be me but I think it's more noticeable now, possibly boost related? Spoke to a guy at Audi, he says it may be wastegate flutter...... Looked on t'internet and seems very common, didn't find any threads on Cupras, not very common car, that's why I bought one! Any thoughts?

 

[SteveTDCi]

Hi all, got this weird noise between 3500/4000 rpm, ie when the boost kicks in on my car. Best described as ffttt ttt ttt tt ttt ttt t a bit like an old VW Beetle exhaust! Goes once thru this rev band and doesn't seem to affect the power delivery, dyno graph shows no glitches there either, nor vag-com. It's always been there despite 3 different maps, had the revo boost turned up last week and it may be me but I think it's more noticeable now, possibly boost related? Spoke to a guy at Audi, he says it may be wastegate flutter...... Looked on t'internet and seems very common, didn't find any threads on Cupras, not very common car, that's why I bought one! Any thoughts?

nothing to do with this post but ... what have you done to your airbox to modify it ?

 

[Cupraken]

Basically opened up the box where the air intake joins the front panel, its very restrictive and also is open to the engine bay at the rear , drawing in very hot air. I made up a plate to block this off so the only air comes from the front grille, i'll try and find the original thread for you!

 

[Cupraken]

Try this : http://www.seatcupra.net/forums/showthread.php?t=227426
Sorry about picasa, hadn't sussed photobucket at this time!

 

[SteveTDCi]

thanks

 

[Poverty]

with a forge spacer fitted the engine can flutter.

 

[Cupraken]

No spacer fitted.......................

 

[Hurdy]

EVOM's intake

Turn it up as the induction roar almost drowns it out

 

[Adam's Cupra]

EVOM's intake

Turn it up as the induction roar almost drowns it out

Have you got an EVOM's? Do you find it too load...

 

[revo carl]

It's not wastegate flutter;

it's the N249 stabilizing the charge pressure as it sits at 1.5-1.6bar

 

[Cupraken]

Thanks, Carl. Is this ok to leave as is or should I be doing something about it?

 

[SteveTDCi]

i guess from the smilie its normal and its venting pressure to keep it around the 1.5bar

 

[Hurdy]

Yes, I have the EVOM's kit. It is loud and the induction roar does sound a little like Darth Vader under the bonnet, but I love it

The best thing is the missis likes it too

 

[Cupraken]

I see there's loads of threads on removing the N249 on the Leon Mk1 forums but nothing on Mk2's. if this is common how come it's not a popular mod for the Mk2 Cupra?

 

[revo carl]

no it's fine you don't need to do anything! the MK2 and the MK1 are completely different cars! and the boost control system works in a different way, the N249 is fine where it is

 

[Adam's Cupra]

Yes, I have the EVOM's kit. It is loud and the induction roar does sound a little like Darth Vader under the bonnet, but I love it

The best thing is the missis likes it too

Interesting.. your putting out some good figures so no problem from heat soak that people keep talking about then

Misses liking it is always a bonus!

 

[Hurdy]

Interesting.. your putting out some good figures so no problem from heat soak that people keep talking about then

Misses liking it is always a bonus!

I have the Forge Twintercooler which helps. I've also just bought the THS intercooler, so that pretty well maxes out anything I can do to combat heat soak until the W/M kit goes on

 

[cJ]

When scanning my car, shows up a N249 intermitent mechanical error, what is exactly the N249? is this the diverter valve? or some other thing? thank you mates.

 

[Cupraken]

N249 is a solenoid that controls the diverter valve, the Mk1 boys remove them as they're troublesome but I haven't heard of a Mk2 giving problems... It could be the DV itself giving problems and throwing up a code for the N249, check the diaphragm on the DV hasn't split, common on earlier Mk2s, solved by fitting a Forge or OEM piston type replacement

 

[vRSy]

would uprating your waste gate to the new forge one with stiffer springs solve any wate gate issues