4.0 litre Air Filters
- Thread starter Kenlog770
- Start date
I agree with the filter change intervals. I changed mine just after it's first service and I'll do the same in March when it has it's 4 year.
In honesty, I could probably change them a little quicker now I know what I'm doing and I derad to think what an OPC would charge in labour.
Dan
In honesty, I could probably change them a little quicker now I know what I'm doing and I derad to think what an OPC would charge in labour.
Dan
I recently had mine changed on my 981S and the OPC charged me £353 for parts and labour. This also included changing the V belt which is also required every 6 years or 60k miles. The labour appeared to be about £200 so I guess one hour!
A very relevant post regarding air filter change on the 4.0 engine. My CGTS 4.0 is 4 years old and 15,000 miles up. I have been considering changing the air filters anytime now.
I have always changed the air filters before the recommended intervals on all of my Caymans. The job was an easy DIY on 987's and a very tricky faff on the 718 4 cylinder cars. I managed it okay.
Is the removal of the various plastic and metal trim pieces the same on the 4.0 as on the 4 pot cars?
As the 4.0 has two. air filters for each bank of cylinders, I would also appreciate any tips regarding achieving access to the air filter housings and replacing the air filters. I would enjoy being able to do this job myself if possible, as I did on my previous Caymans. I'm a little puzzled by the rope attached to the right air filter housing shown in the photograph.
Brian.
I have always changed the air filters before the recommended intervals on all of my Caymans. The job was an easy DIY on 987's and a very tricky faff on the 718 4 cylinder cars. I managed it okay.
Is the removal of the various plastic and metal trim pieces the same on the 4.0 as on the 4 pot cars?
As the 4.0 has two. air filters for each bank of cylinders, I would also appreciate any tips regarding achieving access to the air filter housings and replacing the air filters. I would enjoy being able to do this job myself if possible, as I did on my previous Caymans. I'm a little puzzled by the rope attached to the right air filter housing shown in the photograph.
Brian.
mikeg
Member
This is the YouTube video I used Brian. It’s for the 981 GT4 but is the same as the 718 4.0. Just don’t loose the plastic ‘top hats’ from the trim locator pins when you take the panels off.
Take your time and you may find the removal of the airfilers themselves a little tough. Use 2 zip ties linked and looped together around the 2 loops at the top and bottom of the air filter housings. Make sure they are tight enough to unlatch the retaining clip and then pull really hard. They’ll come out eventually. The new filters don’t have any screw holes in so you’ll have to use some force to screw the new filter into the housing. Be sure to hoover out the detritus from the intake tube. I found some dead leaves and small stones in mine. This is a comparison old vs new after about 15000 miles.
Take your time and you may find the removal of the airfilers themselves a little tough. Use 2 zip ties linked and looped together around the 2 loops at the top and bottom of the air filter housings. Make sure they are tight enough to unlatch the retaining clip and then pull really hard. They’ll come out eventually. The new filters don’t have any screw holes in so you’ll have to use some force to screw the new filter into the housing. Be sure to hoover out the detritus from the intake tube. I found some dead leaves and small stones in mine. This is a comparison old vs new after about 15000 miles.
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Thank you Mike and Dan for your very helpful replies.
Is the Porsche gasket lubricant necessary or can a substitute serve the same purpose?
Brian.
Is the Porsche gasket lubricant necessary or can a substitute serve the same purpose?
Brian.
You could doubtless use the K&N equivalent, however, all of these products are expensive so you may as well use the correct item?
The product is Kluber Syntheso Glep 1.
Porsche part # 000-043-305-01
BMW part # 83239407778
That is for a 100g tube and will cost £30-40.
10g is comfortably more than you will need to do both filters on a 4.0 litre and can be bought for £10 from ebay.
The product is Kluber Syntheso Glep 1.
Porsche part # 000-043-305-01
BMW part # 83239407778
That is for a 100g tube and will cost £30-40.
10g is comfortably more than you will need to do both filters on a 4.0 litre and can be bought for £10 from ebay.
Thank you for the very helpful information on the gasket lube and extracting the filters.
On my previous Caymans I have always used the specialist cotton air filters as supplied by BMC or K&N. In my experience both products have been trouble free and had the advantage of being reused after cleaning with the propriety cleaning kit. I used the K&N cleaning kit successfully on both the BMC and K&N filters. Before selling the car I chose to replace the air filters with the OE product.
I would appreciate comments from others who've done this job regarding replacing the air filters on the 4.0 engine with BMC, K&N, or original Porsche paper air filters. Are there any warranty quibbling issues if the cotton air filters are fitted, and have any owners asked the OPC to fit the BMC or K&N filters in place of the OE item, and has the OPC agreed to do this?
Brian.
On my previous Caymans I have always used the specialist cotton air filters as supplied by BMC or K&N. In my experience both products have been trouble free and had the advantage of being reused after cleaning with the propriety cleaning kit. I used the K&N cleaning kit successfully on both the BMC and K&N filters. Before selling the car I chose to replace the air filters with the OE product.
I would appreciate comments from others who've done this job regarding replacing the air filters on the 4.0 engine with BMC, K&N, or original Porsche paper air filters. Are there any warranty quibbling issues if the cotton air filters are fitted, and have any owners asked the OPC to fit the BMC or K&N filters in place of the OE item, and has the OPC agreed to do this?
Brian.
I just replaced with the OEM paper filters. Studies have found that changing to oiled filters provide very little in the way of HP increases but they do provide more induction noise. GT products us BMC filters however they are expensive on the 4.0 (around double the cost of the paper filters IIRC). A word of caution though, over oiled filters can lead to clogged MAF sensors which can be a proper ball ache to clean.
Asking your OPC to change from paper to oiled depends on the relationship you have with them.
Dan
Asking your OPC to change from paper to oiled depends on the relationship you have with them.
Dan
Thank you for your helpful comments Dan.
On this occasion I was leaning towards fitting the OE air filters and your comments support this.
I am aware of the oiled air filters potential to interfere with the MAF sensors. Although I have had no such problems with this aspect in the past on all my 987 and 718 Caymans.
I'll stick with the standard OE air filters on this occasion. The job will be done soon and I'll report back with comments as appropriate.
Brian.
On this occasion I was leaning towards fitting the OE air filters and your comments support this.
I am aware of the oiled air filters potential to interfere with the MAF sensors. Although I have had no such problems with this aspect in the past on all my 987 and 718 Caymans.
I'll stick with the standard OE air filters on this occasion. The job will be done soon and I'll report back with comments as appropriate.
Brian.
I decided to fit the BMC cotton air filters after all. I ordered both the OE paper filters and the BMC filters to compare both side by side before finally deciding. The superior build quality of the BMC product was unquestionably apparent. The provision of gaskets to secure an airtight fit between the filter and the plastic housing unit was a nice touch I thought. The OE paper air filters are put aside for replacing the BMC products when I eventually sell on my car.
I used an ice scraper with a slot cut in it to help dislodge the plastic trim pieces. I also took the tip to deploy a tiny piece of Blue Tack to secure the rubber cones on the prongs before refitting the trim panels. Thankfully no cones were lost.
The removal of the 6 trim panels was easier than refitting them. Patience and perseverance are the watchwords here.
As with the other photos on this thread, the dirty filters removed from my car were distorted to the extent that the paper folds were almost closed together. This would have a detrimental effect on efficient airflow. Intense heat inside the air box tunnels, together with moisture inhalation when driving in the wet, results in softening of the paper element leading to further distortion.
The 4.0 engine is a high revving unit and the air flow pressures inside the air box tunnels leads to a very challenging environment. This is a big capacity engine requiring an efficient pair of lungs. The suction forces passing through the paper filters, particularly at higher revs, leads to the paper fold distortions seen on each of the photos of dirty filters. The aluminium frame and mesh supporting the BMC cotton air filters provides a far more robust and durable air filter performance in my opinion.
A 100km (62 miles) road test following the BMC filter replacement confirmed two perceptible outcomes. Normal gentle driving produced no increase in cabin noise. Only when opening the taps and revving through the 4000 rpm threshold was a throaty induction growl apparent. Throttle response in the mid-range revs sector seemed sharper and more responsive than before.
My grateful thanks to all for the help and support provided by contributors to this excellent thread.
Brian.
I used an ice scraper with a slot cut in it to help dislodge the plastic trim pieces. I also took the tip to deploy a tiny piece of Blue Tack to secure the rubber cones on the prongs before refitting the trim panels. Thankfully no cones were lost.
The removal of the 6 trim panels was easier than refitting them. Patience and perseverance are the watchwords here.
As with the other photos on this thread, the dirty filters removed from my car were distorted to the extent that the paper folds were almost closed together. This would have a detrimental effect on efficient airflow. Intense heat inside the air box tunnels, together with moisture inhalation when driving in the wet, results in softening of the paper element leading to further distortion.
The 4.0 engine is a high revving unit and the air flow pressures inside the air box tunnels leads to a very challenging environment. This is a big capacity engine requiring an efficient pair of lungs. The suction forces passing through the paper filters, particularly at higher revs, leads to the paper fold distortions seen on each of the photos of dirty filters. The aluminium frame and mesh supporting the BMC cotton air filters provides a far more robust and durable air filter performance in my opinion.
A 100km (62 miles) road test following the BMC filter replacement confirmed two perceptible outcomes. Normal gentle driving produced no increase in cabin noise. Only when opening the taps and revving through the 4000 rpm threshold was a throaty induction growl apparent. Throttle response in the mid-range revs sector seemed sharper and more responsive than before.
My grateful thanks to all for the help and support provided by contributors to this excellent thread.
Brian.
Brian,
On my Cayman project the car was initially fitted with new OEM airfilters when the 3.8L engine was installed but when mapping the ECU on a Dyno they fitted BMC filters and gained 5PS at the top end. I think you are seeing the benefit of BMC over OEM plus a clean filter. Of course Porsche use BMC on Cup and GT3 R race cars.
On my Cayman project the car was initially fitted with new OEM airfilters when the 3.8L engine was installed but when mapping the ECU on a Dyno they fitted BMC filters and gained 5PS at the top end. I think you are seeing the benefit of BMC over OEM plus a clean filter. Of course Porsche use BMC on Cup and GT3 R race cars.
Thank you Ralph.
As a keen follower of the 911 Carrera Cup and Cayman Sprint Challenge, I am gratefully reassured that BMC cotton air filters are default fittings on these race cars. If it's good enough for them......
Having seen the poor condition of my 15,000 mile OE paper filters, I am pleased to have fitted the more robust and durable BMC variety. I would venture the opinion that OE paper filters are not best suited to the extremely hostile environment within the Cayman and Boxster air induction system.
Brian.
As a keen follower of the 911 Carrera Cup and Cayman Sprint Challenge, I am gratefully reassured that BMC cotton air filters are default fittings on these race cars. If it's good enough for them......
Having seen the poor condition of my 15,000 mile OE paper filters, I am pleased to have fitted the more robust and durable BMC variety. I would venture the opinion that OE paper filters are not best suited to the extremely hostile environment within the Cayman and Boxster air induction system.
Brian.
Having driven 170 miles since fitting the BMC air filters, the PCM screen suddenly went blank. This was easily rectified by performing the soft reset procedure. Holding down the volume control button for 15 seconds restored the reloading of all car and navigation systems. All working normally.
I'm assuming it is not a coincidence that the manual PCM reset was necessary following the BMC air filter replacement. The significant changes to air flow volumes point to this.
Have any other 4.0 owners experienced a similar PCM reset after fitting the BMC filters?
Needless to say I am absolutely delighted with the results. The driving pleasure has been enhanced beyond expectations. My CGTS 4.0 sounds better, and goes better, following this filter upgrade.
Brian.
I'm assuming it is not a coincidence that the manual PCM reset was necessary following the BMC air filter replacement. The significant changes to air flow volumes point to this.
Have any other 4.0 owners experienced a similar PCM reset after fitting the BMC filters?
Needless to say I am absolutely delighted with the results. The driving pleasure has been enhanced beyond expectations. My CGTS 4.0 sounds better, and goes better, following this filter upgrade.
Brian.
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