Jump to content

Increased power TD5's - what have you done to solve the MAF issues?


twr7cx

Recommended Posts

I'm interested to know what methods others are using for the MAF issues that arise when running larger turbos/VNT/VGT or sometimes even the standard turbo with the waste gate adjusted a lot.

One method I have seen but not tried myself, is the MAF bypass hose - I believe for this a secondary output is put from the air filter box to the rocker cover breather connection on the pre-turbo air intake pipe allowing some air to bypass the MAF and enter without having been metered by the MAF. Anyone had issues prior and then success using this method?

Previously Alive Tuning (formerly TD5Alive) offered a modified MAF which worked. I notice that it is not listed on their website and if I recall it wasn't previously either, I think you had to contact them directly. Sadly it was based on the aftermarket MAFs and the quality was horrendous - it started separating in the first week I had it. I also had concerns about the automatic transmission as there are many stories about it acting strange or gear shifts being rough due to aftermarket MAFs which are resolved when the genuine item is installed.

I then replaced this with a genuine MAF and the IRB Developments Two-Channel Turbo Boost Box (two channel as one does the MAP signal as per the other Turbo Boost Boxes available, but the second channel does the MAF signal). This has worked well since fitting and adjusting in early 2013 but recently my D2a TD5 is running crud (check out IRB Developments Td5 Dual/Two Channel Turbo Booster Box adjustable tuning instructio? for error details) and I suspect due to a failed IRB Developments Two-Channel Turbo Boost Box. I have checked the wiring loom, connections and power and earth to it. Sadly due to the black stuff they put all over the circuitry I cannot test or see if there is any issue in there.

So, I'm hesitant to modify the air filter box (but probably shouldn't be as I'm sure a new lid can be easily sourced from a wrecker), have concerns on returning to the Alive Tuning MAF due to the build quality and Ian at IRB Developments is ignoring my e-mails, Facebook Messages (of which Facebook advises he has received) and What'sApp messages so I don't seem to be able to purchase a replacement and am therefore curious if in the six years that have elapsed since I last looked into this there have been any further developments or options arise?

Also found Diablo Demon Tuning which offer their M.A.F. Demon Land Rover TD5 MAF controller performance tuner . I'm not sure that it actually does what I'm trying to achieve though, I think it might do the opposite? They seem to also make their version of a turbo boost box for the MAP sensor called the Boost Demon which is a quiet neatly packaged to sit next to the sensor itself with the original wiring loom plugging straight in - Land Rover TD5 performance Pro Boost controller boost box and fueling adjustment .But there seems to be no purchase options or contact details on there site to discuss further? Strange.

Link to comment
Share on other sites

Hi, that MAF bypass hose ideea is the worst thing i've ever seen cos it affects the whole air flow reading and can lead to high EGT, all your problems are solvable with a proper remap which can bring up the MAF cut-out limit from 680 to 800 and the overboost limit as well with higher end MAP without using so much external tricking devices .... if you insist to trick the ECU which has an unproper fuel map in it for a VNT turbo simply put a  4.7V clamp on the MAF signal which at least will let the reading to be correct untill the upper limit then cut the excess that's all.... the same principle like what the boost box does with the MAP reading to avoid overboost

any reputable tuner can do all those things within the fuel map no need for all kind of "gizmos" which IMO are only a waste of money and the final result is to shorten the engine's life

  • Like 1
Link to comment
Share on other sites

There is some really interesting reading available on http://www.discotd5.com including, if you dig deep enough, some comparisons on different tuners maps. Generally though, it would seem that previously tuners were a bit limited in what they were/could modify and due to this the electric trickery solutions came about (turbo boost boxes, dual channel variants, variants for the MAF too and modified MAFs) or physical solutions (such as disconnecting the MAF or air bypasses). It would seem that the research and investigation further into the Td5 map tuning by Paul and his associates documented on that site, has opened up the potential within the tuning to resolve these issues through the tune itself. Judging from this link https://bellautoservices.co.uk/store/td5-1-4-bar-boost-ecu-recalibration/ it looks like Bell Auto Services have adopted this for the MAP.

Link to comment
Share on other sites

on my old td5 with a vnt, large bore manifold, charge cooler & associated mods, we used a 3bar map sensor & adjusted the map algorithms / calibrations to take that into account & also adjusted the scaling of the MAF to increase the flow it would:  A read & B still activate the inbuilt ecu engine protection

 

Link to comment
Share on other sites

There are people out there programming like you saw on Discotd5.com and if programmed well, you can have a high power & torque engine with no smoke and in most cases no issues with MAF.

I have a VGT, large PWR intercooler and 4bar MAP sensor (Standard is 2bar), but standard MAF.

In theory the engine should be around 190BHP & 380Nm torque at peaks.

As it's now Auto, I don't have any MAF cuts as it's rarely on high end revs.... (And as I get older I much prefer to potter the majority of the time.....)

There is a member on here who had an upgraded tuning map on a standard engine from the same source and does have some MAF cut issues at high load / high RPM which we've not managed to solve, but it was 4k+ RPM under heavy acceleration. (The same engine had this before the tuning map upgrade too which we cannot understand or cure)

Although genuine ones are hard come by, the same programmer will adapt the maps to use a Nissan Skyline MAF which are capable of handling a lot more air volume and eliminate any MAF cut issues. 

 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We use cookies to ensure you get the best experience. By using our website you agree to our Cookie Policy