Hi folks,
I have a Golf TDI with a manual transmission. Love it, BTW.
Today, while the car was fully warmed up, I noticed that, for about 10 minutes or so, the car became dramatically more responsive, as though the turbo suddenly had zero lag whatsoever.
Anyone with a similar engine/transmission set up probably knows that, unless you're always keeping the revs high, there's a pretty noticeable turbo lag. Plant the pedal at, say 2200 RPM in 2nd gear, and not much happens for a beat before the turbo spools up and wafts you forward. And it's even more noticeable in the super-short 1st gear, where by the time the turbo wakes up, the tack is zinging past 3000 RPM and it's time to shift anyway.
But for a few minutes today, I was really surprised to find that, even in 1st gear and after letting out the clutch gently, I could plant the pedal and the engine pulled hard and instantaneously with zero lag from as low as 1500 RPM. Same in other gears, though the effect was most noticeable in 1st and 2nd gears. I tried lugging the engine around to see how low I could get the turbo to spool up, and shockingly, it was pulling hard by 1300 RPM or so, not the usual 1800-2000.
Also, the little shift "suggestion" on the MFI, which recommends and upshift or downshift depending on driving conditions, was behaving very differently. Cruising at 1800-2000 RPM in 3rd or 4th, the indicator was suggesting a downshift. Normally, any cruising over 1500 RPM results in a suggested upshift.
Finally, it was idling a little rough during this period. It shuttered lightly every once in a while in no particular pattern, like a cylinder was misfiring occasionally.
Anyway, it was great fun for about 5-10 minutes, but then the car started behaving normally and did so for the rest of the 40 minute drive.
This happened when the car was fully warmed up, 300 miles into a tank of diesel with 1635 miles on the odometer.
Any ideas? I thought maybe it was burning off stuff in the particulate filter, thus changing the fuel mapping, but I'd be surprised if that would change the engine dynamics so much.
Sorry for the long post, I just wanted to cover all the bases.
I have a Golf TDI with a manual transmission. Love it, BTW.
Today, while the car was fully warmed up, I noticed that, for about 10 minutes or so, the car became dramatically more responsive, as though the turbo suddenly had zero lag whatsoever.
Anyone with a similar engine/transmission set up probably knows that, unless you're always keeping the revs high, there's a pretty noticeable turbo lag. Plant the pedal at, say 2200 RPM in 2nd gear, and not much happens for a beat before the turbo spools up and wafts you forward. And it's even more noticeable in the super-short 1st gear, where by the time the turbo wakes up, the tack is zinging past 3000 RPM and it's time to shift anyway.
But for a few minutes today, I was really surprised to find that, even in 1st gear and after letting out the clutch gently, I could plant the pedal and the engine pulled hard and instantaneously with zero lag from as low as 1500 RPM. Same in other gears, though the effect was most noticeable in 1st and 2nd gears. I tried lugging the engine around to see how low I could get the turbo to spool up, and shockingly, it was pulling hard by 1300 RPM or so, not the usual 1800-2000.
Also, the little shift "suggestion" on the MFI, which recommends and upshift or downshift depending on driving conditions, was behaving very differently. Cruising at 1800-2000 RPM in 3rd or 4th, the indicator was suggesting a downshift. Normally, any cruising over 1500 RPM results in a suggested upshift.
Finally, it was idling a little rough during this period. It shuttered lightly every once in a while in no particular pattern, like a cylinder was misfiring occasionally.
Anyway, it was great fun for about 5-10 minutes, but then the car started behaving normally and did so for the rest of the 40 minute drive.
This happened when the car was fully warmed up, 300 miles into a tank of diesel with 1635 miles on the odometer.
Any ideas? I thought maybe it was burning off stuff in the particulate filter, thus changing the fuel mapping, but I'd be surprised if that would change the engine dynamics so much.
Sorry for the long post, I just wanted to cover all the bases.