as it seems to have been raised a number of times, I thought I would write a short piece on blanking the EGR and DPF removal with a dongle, I've had mine in for nearly 5,000miles, so I can give a decent review now, and gives a good indication of the pro's and con's. The basics are that it is a cheap way (around £30) of fully blanking the EGR and deleting the DPF, with decent fuel savings and hopefully long term benefits for the car! Especially for those who don't want a full 'power remap' (because of insurance, having read about engine issues, MOT failures or having a chocolate clutch on the 1.9!) I had my MOT today with the smoke test (which was the final piece of evidence before I wrote this review), and it easily passed.
What is it?
The dongle is a modified OBDII reader. This sits permanently in your OBDII port (just under the foglight switches. The dongle has two built in functions:
1. EGR blanking. 2. DPF ‘removal’, which are selectable with switches (so you can have with without the other)
• Better MPG. Average mpg over 5,000miles before fitting (running with an EGR restrictor) was 43.5mpg, in the 4,000+ miles since, it is 46.5mpg (6% better). About the same as the drop measured by the American trucking association measured over their fleet when EGRs were introduced!
• £££, due to the above, this gives me about 50 miles extra per tank, or £7saving (paying for itself quickly), especially as I get paid 14p per mile with work.
• Do you find yourself riding the clutch a little too much for your liking when pulling off in first? I used to….the car is now FAR more responsive at these low revs (it was a shock first time!), and a little more responsive through the engine range
• Less soot in the manifold and on the swirl flaps etc (which also produces less soot in the exhaust as it causes flocking of particles).
• MOT test. I had my MOT today, pass level 1.50 l/m (or 3.0l/m if produced before 2008), the car passed with 1.12 l/m, well within the pass level
• More power, probably around the same 6% as efficiency savings, it is certainly noticeable below 2,000rpm, but elsewhere not hugely noticeable (first time I drove after DPF removal the turbo was boosting to it’s limits often (on acceleration) as there was less back pressure on it, the ECU quickly lowered the boost to account for this, learning the new turbo behaviour, so over boosting does not occur now.
• No DPF or EGR issues!!!!
• Lower maintenance? Hopefully with the points noted above,there should be benefits, longer clutch life, no EGR failures, less likelyhood of swirl valves sticking, less gunk in the turbo, reduced gunk in the inlet valves, and all the issues associated with those (MPG, driveability, cost)
• Occasional EML light, this has happened 3 times since fitting the dongle. Clears when the engine switched off and keys removed (appears the cause is removing the key too quick! The light appears on the next journey. The dongle needs around 4 secs to clear the fault codes between switching off and key removal)
• You need to core, or drill your DPF (luckily I was given a 2nd hand one free which I used), some people are concerned the law may be changed (though interesting the latest changes were not retrospective).
• Some people like to have another dongle in their OBDII port (to continuously read their engine), this will clearly be in use.
• More soot out the exhaust (not stopped by the filter) , but still well within legal limits.
How does it work?
The first answer is that it is NOT a remap, none of the codes are rewritten, and as soon as the dongle is removed, it will be as if the dongle has never been present.
EGR: When the engine is switched off the dongle will delete error messages associated with the EGR being blocked. It will not delete other messages (and hide genuine issues with your engine). The EGR error light normally comes on after 2-3 journeys when the code is produced. So deleting the code after each journey avoids the light coming on (which would be an MOT failure).
For the DPF removal, this works slightly differently. The DPF regenerates after a set period of driving (around 16 hours), or when the pressure builds up too high (and the car sees the DPF as blocked). The dongle works by resetting the clock on every engine shutdown. By removing the DPF (or coring it), there should be no blockage. It is my understanding you must retain the temperature and pressure sensors (as these are also error code producers).
How Do it get it?
Fixitsan now has a yahoo group (Yahoo! Groups
), you can ask to purchase one on there. You will also need to purchase an EGR blanking plate (~£3.50 on ebay), and core/ drill your DPF (you do not NEED to do both, I drove mine for around 1,000miles solely in EGR blanked mode before coring my DPF).