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Hi guys, I recently got a stage 3 Weistec put in my car. They didn’t go crazy with power as I have standard box still (556rwhp). At times under light/moderate throttle the car will “surge” ie almost like I’m taking foot off accelerator then back in again.
my tuner says this issue is caused by the standard air boxes:
This is the stock air box issue
Basically there is a vacuum build up in between the air box and the supercharger, the recirculating valve which dumps boost, gets caught up in this vacuum issue and doesn’t open as it should
anyone else had this issue and did putting aftermarket airboxes in fix it?
I had similar issues and I doubt air boxes will resolve the issue completely. I decided to install an electronic bypass controller and the difference is night and day. Driveability is superb and it came with other features as boost lock, boost level control and vallet. Check it at smoothboost.com Speak to Levon, he is really helpful.
so put airboxes on? if that doesn't fix it find a better tuner.
I’ve ordered some airbox spacers first then if not I’ll have to bite bullet and pay the ripoff prices for aftermarket airboxes.
the tuner is one of the best C63 tuners in the country so I don’t think it’s the tune.
Investigate, don't estimate.
Place a vacuum gauge in the duct between the filter & throttle plate - check the surge relates to the vacuum.
FWIW, I am very sceptical about the air-boxes creating the issue - if that was the case the engine would starve terribly at high rpm & run extremely rich. A reading of the MAF sensors will indicate the limit of the air boxes.
My guess (& it can only be a guess without data) is that there is either something wrong with the bypass / bypass-actuator, or more likely, a calibration (tune) anomaly. Even "the best C63 tuners in the country" sometimes miss a field or jump to a conclusion.
My recommendation is to get some facts/data ... at this stage it appears you are relying on opinion. HPTuners MPVI2 is a good investment.
I am having the same symptom that my shop could not diagnose on my stock setup with v7 EU tune. I've tried older and stock tune also and same thing. I just drive in manual mode now and avoid 1-2k rpms at cruising.
My shop suggested is was a small intake manifold leak that wasn't large enough to through any codes.
It's annoying but I'm living with it a while to see if it changes.
Can’t get the Magnuson bottoms anymore unfortunately.
The Magnuson Lower Airboxes are available, in stock, in Australia.
Contact VCM Performance www.vcmperformance.com.au (sales@vcmsuite.com.au).
From what I am told, they are something like Au$150 for a pair. (~US$110).
The Magnuson Lower Airboxes are available, in stock, in Australia.
Contact VCM Performance www.vcmperformance.com.au (sales@vcmsuite.com.au).
From what I am told, they are something like Au$150 for a pair. (~US$110).
I called them this morning mate and they said nothing in stock...
I called them this morning mate and they said nothing in stock...
You called VCM Performance in Melbourne, Australia?
They definitely have them in stock & for sale. Just called & confirmed. $150 +GST for a pair.
If in doubt, email mario@vcmsuite.com.au
You called VCM Performance in Melbourne, Australia?
They definitely have them in stock & for sale. Just called & confirmed. $150 +GST for a pair.
If in doubt, email mario@vcmsuite.com.au
Yeah mate it was definitely them I called and the guy said nothing in stock. I’ll try again. Thanks
I had same issue. It was my tune. Changed tuner issue gone instantly
i agree based off the information provided. optimum load mapping table is entirely wrong. if this is occurring at low throttle situations its the tune 100%. if it was occurring going into boost or coming off of boost, that is a whole different topic. although, still should start with the tune, faulty equipment could play a role as well.
essentially the computer is seeing something different than actual and its taking over control because it's reference point does not match actual.
just because someone owns a shop doesn't make him a tuner. just because someone has flashed a map, doesn't make him a tuner. just because someone owns software capable of tuning, doesn't make him a tuner. tuning is an art and skill as is carpentry is at the highest levels. go watch an episode of This Old House, and tell me you can do better than him.
would these lower boxes be compatible for non supercharged configurations? i would assume no?
A new/custom Y-duct between the air-boxes & the manifold would be required.
A duct could be relatively easily made by 3D printing a mould & making in silicon... I would do it if there was enough interest.
$150 for the pair plus ?$80? for the Y in silicon? I believe some of the C63 guys are already buying M63 Y pipings for added power. I'm sure there is an interest, but i wouldn't be a good judge on that.
A new/custom Y-duct between the air-boxes & the manifold would be required.
A duct could be relatively easily made by 3D printing a mould & making in silicon... I would do it if there was enough interest.
Could you make a bigger box that would use say an amg gt filter and make it fit?
So wait, the tuner wants you to get aftermarket air boxes? not row boxes? lol. Why does your car only make 20whp more than mine with a way bigger blower on it. Mine was done on a mustang dyno as well which read lower than dynojets usually. If tuner is so great you should probably name him...
So wait, the tuner wants you to get aftermarket air boxes? not row boxes? lol. Why does your car only make 20whp more than mine with a way bigger blower on it. Mine was done on a mustang dyno as well which read lower than dynojets usually. If tuner is so great you should probably name him...
Why would he want me to get ROW airboxes when that’s what my car has as standard?
As stated in my original post mine could have made more power but wasn’t pushed as has standard gearbox still, did you miss that part?
Also, he’s the guy who tunes most of the fastest C63s in Australia (multiple in the 9 second bracket).
10-27-2019, 04:05 AM
