EA288 2.0 TDI 184PS Development thread..

[monkeyhanger]

Andrew,

Does 3+1 have less of a signal modification than 4+1 across the “map” (and presumably being more efficient through lower fuel usage at any given output), or is the shape of the “map” just slightly different? I have just filled up my car, so I’ll give it a tank’s run on 3+1 and see what I get.

Looking at the 2 dynos, the 4+1 has marginal power gains over 3+1 to 2400rpm (but with almost identical torque development from 2000-2500rpm). That is reversed from 2500rpm to 4000rpm, where the 3+1 edges it in both power and torque right through said range.

[Andrew@DTUK]

Andrew,

Does 3+1 have less of a signal modification than 4+1 across the “map” (and presumably being more efficient through lower fuel usage at any given output), or is the shape of the “map” just slightly different? I have just filled up my car, so I’ll give it a tank’s run on 3+1 and see what I get.

Looking at the 2 dynos, the 4+1 has marginal power gains over 3+1 to 2400rpm (but with almost identical torque development from 2000-2500rpm). That is reversed from 2500rpm to 4000rpm, where the 3+1 edges it in both power and torque right through said range.

Did i give you some coloured graphs with the kit?

[monkeyhanger]

Did i give you some coloured graphs with the kit?

I'm sure they were in the box (I remember seeing them), but the box is now up in the loft so i'd have to dig it out. I thought it might be a case of asking what the voltage increases were on your maps for both 3+1 and 4+1, then make the assumption that if 3+1 has a lower voltage increase across the range then it should be fuelling less than 4+1. Either way i'll give 3+1 a go when I get home tonight.

[Andrew@DTUK]

Did i give you some coloured graphs with the kit?

I'm sure they were in the box (I remember seeing them), but the box is now up in the loft so i'd have to dig it out. I thought it might be a case of asking what the voltage increases were on your maps for both 3+1 and 4+1, then make the assumption that if 3+1 has a lower voltage increase across the range then it should be fuelling less than 4+1. Either way i'll give 3+1 a go when I get home tonight.

Im sure you have the same map 3 as me, give it a whirl and it shouldn't feel as aggressive in the lower rpm.

[KyleB]

Are you recommending 3+1 then Andrew as the optimum map?

[virginVWman]

240bhp... !! That is seriously impressive

[Millie_chops]

240bhp... !! That is seriously impressive

Yip. That's why I'm fairly sure I will be investing in one when I receive my GTD

Will run it for a 1000 miles or so first then most likely bite the bullet.

[monkeyhanger]

Had to pop to Screwfix to get a mini bit set as those T10 bits are so hard to come by for opening up the DTUK box.

Made the adjustment to 3+1 at Screwfix and drove the 2 miles home. It was wet (for the first time in quite a while) and I don't know whether I was just a bit enthusiastic, but I got my first taste of 3rd gear wheelspin on the move with the DTUK box, with the traction control kicking in very noticeably. I'll see what it is like on a real run tomorrow, whether it needs a bit more control on my part to avoid wheelspin in 3rd. If it does, I will probably switch back to 4+1.

I'll leave mpg out of it because I filled up with Shell (I had a £5 voucher that needed using) - and Esso with 80mL of Millers gives by far my best mpg. Shell without Millers (I added when I got home) gave me 41mpg for my first 15 miles.

So far on 4+1, the car has been transformed with the DTUK box.

Looking at the graphs for map modification settings that Andrew included with the box implies that the 3+1 setting would use less fuel to achieve its output as the signal alteration is noticeably lower than that for 4+1, although there are no implications of the car being wasteful with fuel in terms of soot generation - the cra is doing far less active DPF regenning than it was at stock.

[TheCarMadDad]

240bhp... !! That is seriously impressive

Yip. That's why I'm fairly sure I will be investing in one when I receive my GTD

Will run it for a 1000 miles or so first then most likely bite the bullet.

+1

[ffrank]

240bhp... !! That is seriously impressive

Yip. That's why I'm fairly sure I will be investing in one when I receive my GTD

Will run it for a 1000 miles or so first then most likely bite the bullet.

+1

+2