TDI CRTD2 Vs CRTD4 tuning box

DriveS · 09-16-2017, 11:47 AM

I recently upgraded my TDI CRTD2 (twin Channel) tuning box to the triple channel CRTD4. After a couple of weeks here is what I have noticed -

I can notice a small increase in power, more noticeable in the mid to high rev range.
TDI originally quoted the twin channel as 370/700 (verified at a meet once) and the triple has always been quoted as 377/730. Now i notice they are quoting the twin channel one at 356bhp, which is probably to sell the triple channel one as there is a higher margin. So the power increase i notice seems to correspond with and extra 7bhp/30nm (approx).

The power curve must be better, as I definitely notice that the power does not drop of before the auto change like the twin channel.

No noticeable difference in responsiveness as it was lightening fast before.

KCH1984 · 09-16-2017, 12:16 PM

This seems to correspond with what others such as @JLR1969 have seen when going from a twin channel to triple channel box.

The addition of the cam sensor better allows the box to manage the increase in rail pressure across the rev range for a 'better' tune. Certainly they don't seem to suffer with any fuel cut issues at higher states of tune, which I know affected 35d owners running Bluespark boxes.

With these now on the market it would seem like a no-brainer for those not wanting to go for a full remap for whatever the reason.

09-16-2017, 11:47 AM	#1
DriveS Lieutenant 220 Rep 541 Posts Drives: F30 335d Join Date: Dec 2011 Location: Newcastle iTrader: (0)	TDI CRTD2 Vs CRTD4 tuning box I recently upgraded my TDI CRTD2 (twin Channel) tuning box to the triple channel CRTD4. After a couple of weeks here is what I have noticed - I can notice a small increase in power, more noticeable in the mid to high rev range. TDI originally quoted the twin channel as 370/700 (verified at a meet once) and the triple has always been quoted as 377/730. Now i notice they are quoting the twin channel one at 356bhp, which is probably to sell the triple channel one as there is a higher margin. So the power increase i notice seems to correspond with and extra 7bhp/30nm (approx). The power curve must be better, as I definitely notice that the power does not drop of before the auto change like the twin channel. No noticeable difference in responsiveness as it was lightening fast before.
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09-16-2017, 12:16 PM	#2
KCH1984 Major 952 Rep 1,447 Posts Drives: Tesla Model Y LR Join Date: Jan 2017 Location: Glasgow, Scotland iTrader: (0)	This seems to correspond with what others such as @JLR1969 have seen when going from a twin channel to triple channel box. The addition of the cam sensor better allows the box to manage the increase in rail pressure across the rev range for a 'better' tune. Certainly they don't seem to suffer with any fuel cut issues at higher states of tune, which I know affected 35d owners running Bluespark boxes. With these now on the market it would seem like a no-brainer for those not wanting to go for a full remap for whatever the reason.
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