Tumble flaps
Tumble flaps
Hi, Im going to do a carbon clean soon and was reading a lot of people remove the tumble flap.
What are the pros and cons of doing so?
What are the pros and cons of doing so?
Re: Tumble flaps
Better airflow but slight loss of torque at lower rpm I believe.
I left my ones in after my carbon clean as there was no play in them.
Wiki says the tumble flaps are there to assist low engine speed combustion.
I left my ones in after my carbon clean as there was no play in them.
Wiki says the tumble flaps are there to assist low engine speed combustion.
Misano Red RS4 B7 Avant
- RossDagley
- Top Gear
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Re: Tumble flaps
It runs a little more lumpy on part throttle openings, especially when cold. But the benefits are less restriction and less to gum up/go wrong!
Believe only the man who has nothing to gain from what he says.
2017 BMW M4 Competition Pack - Mineral Grey - 530ps by bootmod3, JCWeldfab exhaust.
Previously:
Renault Megane R26 - Liquid Yellow - 275ps.
2015 Audi Exclusive RS4 B8 - Merlin Purple - JCWF Exhaust
2009 Audi RS6 C6 - Phantom Black - 730ps MRC Tuned
2008 Audi RS4 B7 - Phantom Black - 449ps MRC Tuned
2002 Peugeot 106 Gti - Mauritius blue - 430ps Home built.
2017 BMW M4 Competition Pack - Mineral Grey - 530ps by bootmod3, JCWeldfab exhaust.
Previously:
Renault Megane R26 - Liquid Yellow - 275ps.
2015 Audi Exclusive RS4 B8 - Merlin Purple - JCWF Exhaust
2009 Audi RS6 C6 - Phantom Black - 730ps MRC Tuned
2008 Audi RS4 B7 - Phantom Black - 449ps MRC Tuned
2002 Peugeot 106 Gti - Mauritius blue - 430ps Home built.
Re: Tumble flaps
The tumble flaps simple close off half of the intake path leading to the cylinder. As it's low rpm this isn't a restriction but does have the effect of increasing the velocity of the air into the chamber so when the fuel is injected it can mix up a bit better.
If properly mapped there is no loss in power but will hit economy by a couple mpg when just pootling about
If properly mapped there is no loss in power but will hit economy by a couple mpg when just pootling about
Re: Tumble flaps
In order for you to remove the tumble flaps you will have to punch out the freeze plugs. There is a company out there that recommends reusing them by applying loctite upon reinstall but I strongly suggest you don't. New freeze plugs can be sourced (not by Audi) but you'll have to dig a little bit. PM me if you need them.
I have been running a deflapped p/p IM for years now with no adverse effects. Highest g/s I saw was 174 per bank. I believe with a tune that removes the tq limiter and considers less manifold restriction, p/p would tie in nicely. Perhaps Doug from MRC can chime in on this.
If anyone here is looking for a port/polished, deflapped IM (work performed by silverrs4) PM me, I have a spare one for sale.
I have been running a deflapped p/p IM for years now with no adverse effects. Highest g/s I saw was 174 per bank. I believe with a tune that removes the tq limiter and considers less manifold restriction, p/p would tie in nicely. Perhaps Doug from MRC can chime in on this.
If anyone here is looking for a port/polished, deflapped IM (work performed by silverrs4) PM me, I have a spare one for sale.
Re: Tumble flaps
I used a very small ratcheting wrench with a very short torx bit to remove flaps without touching the freeze plugs. Had them all out in 30 minutes
Re: Tumble flaps
If they aid low down torque I think I'll leave them in as it's a little lacking in the low torque dept.
Re: Tumble flaps
This is good to know.SkyDude wrote:I used a very small ratcheting wrench with a very short torx bit to remove flaps without touching the freeze plugs. Had them all out in 30 minutes
Re: Tumble flaps
Hmmm I have a different view, I had low end torque pick up, albeit ever so slightcoffey555 wrote:Better airflow but slight loss of torque at lower rpm I believe.
I left my ones in after my carbon clean as there was no play in them.
Wiki says the tumble flaps are there to assist low engine speed combustion.
It is a bit lumpy below 3k revs when cold
The power gains post de flap and carbon clean are really very noticeable
No error codes yet either, I vote do it and add I take spacers too at same time
- PetrolDave
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Re: Tumble flaps
Was the power gain due to de-flapping, carbon cleaning or both?hlbeckley wrote:The power gains post de flap and carbon clean are really very noticeable
If you did them both at the same time then it's impossible to tell, but anecdotally carbon clean is worth c. 30bhp.
Gone: 2006 B7 RS4 Avant (Phantom Black)
Re: Tumble flaps
Both same time but driven a de flapped post CC and flaps in, delivery is very different
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