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BigKev2

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    Retired Mechanical Engineer. Like cycling and motorcycling
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    County Durham

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    Octavia 1.5TSI SEL 2017. Reg Jan 2018.

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  1. Hi Soup. As you suggest inlet manifold pressure is a function of turbo spool speed which in turn is a function of exhaust gas flow . Give what you say a try, as there will always be some lag as the input feeds through the system. Just remember to leave the house a bit earlier
  2. Xman - Good post my man. Its good to get a bit of tech detail. I think you are on the right track. The Miller Cycle has been around for decades but not used much. With cars now having forced induction via turbos its possible to make use of the efficiency gains offered by Mr Millers cycle. The Miller Cycle is basically the same as the Otto cycle ie valves, pistons, spark plugs etc. The difference is that the compression and expansion strokes are different. Not physically of course but effectively. The compression stroke is shortened by leaving the inlet valve open for a while as the piston rises on the compression stroke. You would think that's daft as the fresh charge would return to where it came from but not so. The clever bit is the inlet manifold is under pressure from the Turbo so reverse flow is limited. So we get a reduction in compression losses without a loss in the power stroke. I am getting 53MPG long term which I reckon is remarkable for my 1.5TSI petrol. MPG like that is well into diesel territory. The only way to beat the kangaroo is to over rev the engine on pullaway - great when you want to nip out quick at a roundabout, but crap at all other times - clutch wear ?
  3. Its been quite a while since anyone posted on this thread. I have been trying to live with the nose dive without success and have even started to buy magazines and look at another car. However I have decided that first I will go back to the dealer and discuss it. So before I do, has anyone (like me) had the over revving sorted and has then been back to the dealer to see about the nose dive.
  4. ettiz - what a great post. You explain perfectly a situation that drives me mad. Every time I pull away I try to beat the bas-ard but it normally wins. I never considered that it may be intervening based on speed. Its sad that we are so technically advanced now and yet we could pull away better 40 years ago. I am an engineer so I feel I need to persue this crap. On the other hand I am 65 and wonder if I can be bothered. I badgered and badgered to get the rev assist moderated but not sure I can go through it again. Her indoors with all her technical know how is loving it, 'I told you Skodas are sh-t'.
  5. Just back from doing some pull away tests in Tesco car park. I wanted to get more info on when and how the nose dive occurs. It occurs when pulling away in first gear before the clutch is fully released. I can defeat the nose dive if I slip the clutch more using high revs. I can also defeat it if I do a clutch lift with hardly any revs and then put the revs on once the clutch is fully released. I then tried crawling in first gear at tickover speed with clutch fully released. Applying the throttle slowly or fast the car moved smoothly forward with no nose dive. So I believe the clutch position is a factor in the fuelling. I know that the clutch position is the trigger for the over revving on pull away. The trigger point for the rev increase is just off the floor but not yet at bite point. It seems to me that there is another clutch position near the fully released that is involved in the nosedive. For the record I am getting 53mpg long term average and the car drives so smoothly (apart from pullaway) - 1.5 TSI.
  6. You don't have a choice. The car has two issues: As soon as you lift the clutch pedal when in gear a switch tells the brain to rev the engine to approx. 1800rpm. This is before the clutch bites. Your wife will comment, 'you seem to rev this car a lot'. This will drive you mad and the dealer can do a software mod that will tone down this 'Pull away assist' so that it only revs to 1000 from an 800 idle. You will be able to live with that. Before you get the car ask them to do software update - they wont unless you ask (my view) The second issue is the nosedive which seems to have nothing to do with the Pull Away Assist and I like the term Nose Dive Assist. Over revving, 9/10 for annoyance, Nosedive, 4/10. I have yet to start my campaign with Skoda to sort the nosedive, I ride my motorcycle instead. The trick with the 1.5TSI is don't stop, keep moving at all times then it really is a lovely car. The nose dive does however give you the satisfaction of watching wifes head rock forward, revenge for her over revving comments.
  7. Thanks SD. Oh this seems familiar dosnt it, here we go again. After Pullaway saga I just wanted to have a breathing space and hoped I would settle into nose diving. Called to see my mate a couple of days ago to see how he liked his new Octavia and without prompting he said, great car, but it nose dives. Arrrgghh. That set me off again. That's all I needed to re awaken grumpy old man . So I fear its back to see Mr Skoda dealer. I believe there is a mod you can do to fix this issue. It is to fit a thing called a DTUK pedal box. We should not have to do this but if anyone has fitted one to their 1.5TSi Skoda I am interested to hear about it, ie how much, where from, how it fits.
  8. Earlier this year I started a thread regarding the over revving feature that Skoda fitted , called pull away assist. This annoying feature raised the revs to 1800 when you lifted the clutch in first gear. After a campaign with Skoda they reduced the severity of this feature with a software update. Now I have another issue that I am going to take up with Skoda. The car nose dives when pulling away. Its as though the throttle is not responding to your foot. I have tried to work round this issue but just cant get consistent smooth pullaways. So before I go back to my dealer I would like to hear of others experiences when pulling away. My car is a 2018 Octavia 1.5 TSi
  9. Its been a while since I posted. Since I started this thread we have come a long way, 8 pages of posts and a successful outcome with Skoda. However its disappointing to see that Skoda are still releasing these non updated cars knowing that there is an issue with the Pull away assist. Its been several weeks since I had my update carried out. The car still does a very small increase in revs but its OK. What I do struggle with still is the throttle response when pulling away. The car still nose dives at the 1st / 2nd gear change unless the throttle is pressed what seems to be a long way. I just don't seem to be able to get a smooth pull away unless I concentrate on the throttle and revs. Am I going back to the dealer, no. After the Pull Away assist I just cant be bothered with the hassle. |Its a lovely car mind !
  10. SoupD has described perfectly what I experience. I am glad as you begin to doubt yourself. I did suspect that the poorly set up pull away assist was a different issue to the , shall we say , 'nose dive assist'. Isnt it odd that car technology has moved on so much yet driveability can be worse. Years ago If I had a car that performed like the Octavia I would have the plugs, points, HT leads changed and probably stripped down the carb ! As SoupD says its not worth losing sleep over.
  11. Its such an insult to be told to just drive it for a month. Will the car magically heal itself ? I have had the software update and the rev issue is gone, well its still there but hardly noticeable. The car however is still not smooth on pullaways. Its as though you have taken your foot off the accelerator, it nose dives when letting the clutch up in second gear. It seems to be the throttle response. All the cars I have driven have only needed a touch of throttle to maintain momentum as the clutch is lifted in second gear. With the 1.5TSI you have to give it quite a bit of Acc pedal movement to avoid a nosedive. Anyway it is what it is as I have had enough of chasing Skoda. It dosnt really spoil the car, I am getting a long term MPG of 48 which is good for a petrol car with mostly shortish trips and cold weather
  12. Well its been a week since I had the software update to remedy the Pull Away Assist revs (1.5TSI Octavia). I don't think anyone else has had it done yet - or they havnt posted. As I posted at the time the revs are now much improved with only a slight kick as the clutch is lifted. The car still however has an unusual response when pulling away I have been driving 2 litre diesel cars for the last 20 years so maybe I have not adapted to a petrol. The 1.5TSI seems to pull from very low revs and will crawl in 2nd or even third without protest. The peculiarity is that on pull away its as though the fuel is cut off for an instant causing driver and passenger to move forward. Bottom gear seems low and I think the 'bogging down' seems to occur when at the 1st to 2nd change over point. Maybe I am being too lazy with the throttle. Its as though the car wants you to hold onto first gear longer then give it more throttle when lifting the clutch in second. Its not something that would send be back to the dealer but I would be interested if others recognise what I mean when they have their software updated.
  13. It didn't take long to do. I went to the local Mini dealer 200 yards away (spent 20 grand ! ) when I came back car was done. Isnt it strange being retired. When I was at work taking a day off to get car sorted was a pain. Now its oh I am going to meet nice people who will give me a scone and a cup of coffee. Some dealerships are just push push push. Pulmans are great, so relaxed and a nice café. I will have to find something else to winge about so I can come home from the pub and check Briskoda.
  14. The dealer didn't say what had gone wrong and I didn't ask. I don't think the dealer will know as they are likely to be given a code to punch into the cars brain. Its not like the old days where a part was replaced or an adjustment made. He did say that when he drove the car into the workshop the over revving was very noticeable.
  15. SFTWARE UPDATE DONE - FEEDBACK. Software update done and its much better. To explain fully I will say how it was, how it is now, and how it affects pull away BEFORE: Lift clutch, revs jump to 1700 - 1900 from 800 If you keep the clutch at that point (lifted but not yet at bite point) the revs stay at that level. As you continue to lift clutch and bite point is reached the revs fall as load is put on engine. Noise, clutch wear, angry driver. HOW IT IS NOW: Lift clutch, revs flick up to 1300 - 1400 and quickly fall to 1000. This is with the clutch held at the pre bite point. In practice you lift the clutch in one movement so the flick up to 1300 is not noticeable. So I would say that if the car was like this when I got it I would not have noticed that it had a 'pull away assist.' So for me that's the end of the Pull Away revs issue. I did discuss the hesitant nature of the car with the head technician. It appears that emissions and MPG rule in the car world. Cars run on a much leaner mixture than they did years ago. This leaness does seem to make itself felt when pulling away - like not enough choke for those that remember pulling that knob on the dashboard in their youth. I also think the Octavia has low gearing, especially first gear. As soon as the car is rolling you feel the need to get into 2nd gear as it sort of nose dives as the gear is too low to make progress. Anyway I'm not losing sleep over that issue, I will bask in the smugness of my non revving pull aways.
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