Forum:
Thought i'd start another topic as opposed to adding to "looked at YRV turbo today"!!
Since picking up my YRV Turbo on Friday, I noticed there appears to be almost like an overdrive like feature in certain gears. I'm not used to autos by the way! For eg. in 2nd gear, steershift, you could be gently accelerating up towards 3k rpm and there's a dip in revs momentarily, and then revs/speed continue to rise as normal and then it changes to third. I noticed a similar thing in full auto mode. For eg. accelerating in fourth gear it sounds like its changing up into another gear, depending on throttle load etc. (obviously its not because its already in top gear) Maybe i'm not used to autos yet, as i know when you push the accelerator slightly the revs rise instantly, THEN road speed starts to increase (a bit like a slipping clutch really) but that's common with all autos. I realise alot depends on accelerator position/load etc etc. So to recap, its almost like some gears have another separate gear of their own (like some older vehicles had with a switch on top of the gear lever giving you twice the number of gears)
The car's done 22k so hopefully its not knackered just yet!!
Mine does this....
Both Yellow YRV and myself have answered that one on your original post
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'12' Plate Mazda MX-5 2.0 litre NC 3.5 Venture Roadster 160BHP
'15' Plate SEAT LEON 184 FR TDI. 240BHP/500nm Torque.
Past: '53' Plate Yellow YRV Turbo Approx. 150BHP
Talking about it...
Yes, check the other thread, but here is an excerpt from my post in the what's better" http://www.daihatsu-drivers.co.uk/node/13082 thread:
"The DVVT actuates roughly around 3000rpm, you can actually hear (especially with a modified exhaust) and feel the difference when it kicks in. If you do not have the accelerator pedal more than about 50% pushed down, then in auto mode the car will change up a gear before it activates the DVVT. However on steershift, like you say, you can still get over 3000rpm even though you are not really booting it, so the car stays in DVVT actuation and is much more responsive and torquey...
There is one other difference between auto and steershift, for some reason, the "overdrive" does not activate in steershift in 4th gear. You can test this by cruising in steershift in 4th gear at about 70mph, then switch over to auto and you will notice the revs will drop by a few hundred rpm. I reckon this saves a bit of fuel on motorway journeys. "
I took a drive up from Bristol to Oldham to collect my wife's 2003 Charade, stopping along the way for the night in Preston (I saw the yellow YRV Turbo at the dealership) and a few other places in Lancs, saw a red YRV premium as well, slowed down to look at it because I couldn't recognise the "premium" sticker on the back as its the first I have seen! Wonder if it was yours...
Anyway, I had plenty of time to experiment with the gearing on this journey, and I would say in effect the YRV has the equivalent of 9 mini-gears
With my uprgaded exhaust, you can clearly hear the difference and definitely there is a noticeable change in pull when actuated at around 3000rpm. Overtaking is quite a fun experience and you can easily pass some much more powerful cars. In auto mode however, you will find the gearbox hunting a bit as it is trying its best to stay out of DVVT actuation. When I tried the kickdown in 4th in auto going about 70mph, it was going a bit crazy, overdrive on and off, 4th into 3rd and back and into overdrive. Switched to steershift and did the same thing and it was just rapid spool up and then so swiftly up to 85mph that I had to brake quite hard.
The reason for having variable valve timing is actually for fuel efficiency. A desired side effect is the increase in power at those higher revs. It allows an engine to adjust how long the intake valves stay open and the timing (when the spark plugs fire in the combustion cycle) according to rpm. This means that by waiting a bit longer, there is more air (oxygen) taken into the cylinder before ignition.
Similar systems are Honda's Vtec system, and Mitsubishi's MIVEC, Hyundai CVVT, and in my opinion the best of all the systems - Nissan's NeoVVl with independent intake and exhaust adjustment. They all want that same increase in power with better fuel efficiency.
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Just call me G...
2004 Yellow YRV Turbo
Thanks Yellow YRV Turbo & jpor!!
Cheers guys, I guess these autoboxes have some strange characteristics!
I'm pretty rubbish at explaining things! I cannot understand why, in steershift, that the revs DROP slightly at approx 3k rpm in both 2nd & 3rd when accelerating. It's like a momentary pause/gearchange up as the revs near 3k rpm then after this drop in revs it carries on fine. Doesn't do it in Full Auto at all. I didn't think it was the dvvt kicking in as i would have thought there would be a power increase, not a pause? Sorry if I am repeating myself. If your cars do this, do you know why as it seems a strange thing to do whilst you are accelerating. Could understand it if you were not giving it full throttle. Will post some pics up later. Thank you. Wayne
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2004 Yellow YRV Turbo
Could be the ECU compensating....
To answer this, it could be the ECU compensating, as it will probably be mapped to stop overboosting of the turbo perhaps. Don't forget that the Auto-box also has an ECU as well so the 2 talk to each other and therefore it will be how it is mapped. I wouldn't worry
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'12' Plate Mazda MX-5 2.0 litre NC 3.5 Venture Roadster 160BHP
'15' Plate SEAT LEON 184 FR TDI. 240BHP/500nm Torque.
Past: '53' Plate Yellow YRV Turbo Approx. 150BHP
Not going to worry
Yeah I think you're probably right. Have you not noticed this on yours then?
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2004 Yellow YRV Turbo
Oh Yes...
Swapped the cars back over this week and using the YRV again to and from work. Used Steer-shift on the way back home tonight and the same happens, gets to 3K then a dip then it carries on with more power afterwards
Nearly forgot that I was driving the YRV, saying that the YRV could do with better hugging seats ;). It will be hard if I end up choosing to get rid of one of them 
I was thinking about getting rid of the YRV after driving the Impreza for a couple of weeks, but you know what each car gives me a buzz, the YRV has a better launch than the STi, yet the STi goes round corners rather well
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'12' Plate Mazda MX-5 2.0 litre NC 3.5 Venture Roadster 160BHP
'15' Plate SEAT LEON 184 FR TDI. 240BHP/500nm Torque.
Past: '53' Plate Yellow YRV Turbo Approx. 150BHP
Would be a hard decision!
Interesting to hear that the YRV has better launch, although it weighs alot less than an STi. The seats in the YRV are somewhat lacking in the support department, but mine are a huge improvement on the premium, although the turbo has half the miles of the premium which helps. The impreza is a different animal altogether, and I would imagine is more of a drivers car compared to the YRV. Had change up lights on in 1st and 2nd earlier...........very ammusing indeed!
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2004 Yellow YRV Turbo
The launch difference would
The launch difference would be with the turbo and tuning. On the YRV the turbo comes in @ roughly 1,900 RPM, and being a small turbo will spool faster, plus I do have a straight through exhaust system (Blitz Nur-Spec-R) with now only 1 CAT. The STi has a bigger turbo and more lag factor and comes in @ 2,500 RPM, but will pull better with more torque. Horses for Courses
Yeah a lot of people don't realise that green means be ready to change up and red means you have hit the limitof the turbo and to change up. I beleive green comes in @ 6K RPM and red just after 6.5K RPM as this is the most the turbo is desinged to pull at. It's the Same on the Impreza, yet I have the ability to set the warning bleeper and light to where I want this, but I normally set this to max @ 6.5K RPM.
I do beleive Daihatsu were going to fit out the YRV Turbo with a Recaro seat set-up, but for some reason they never did, would make a difference in my opinion to the seating position. I have read that you can use the same recaros from a Suzuki Ignis Sport and these will fit our rails. Before you know it you will want to mod your car
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'12' Plate Mazda MX-5 2.0 litre NC 3.5 Venture Roadster 160BHP
'15' Plate SEAT LEON 184 FR TDI. 240BHP/500nm Torque.
Past: '53' Plate Yellow YRV Turbo Approx. 150BHP
Tested this exhaustively on the way to work today!
Well anyone who saw me driving today must have thought I was either drunk or crazy. Was trying to check whether what you are experiencing is normal or not.
Here are my results in steershift mode:
Slow acceleration - car revs up past 2900 and just as it passes 3000 it drops in revs BUT NOT ACCELERATION - I checked this many times. It seems like a pause because of the sound, but watch your speedometer and you will see the car is still accelerating at the same rate (unless something is wrong with the tuning?) and this is precisely what the variable valve timing is for - to provide the same power at lower revs to improve efficiency.
Faster acceleration - pedal more than 50% depressed - there is a definite "surge" in power delivery after the DVVT changeover. The car revs the rest of the range quicker and acceleration is increased. This would occur in non-DVVT cars as well, but at the cost of efficiency (or power) either higher up or lower down in the rev range, depending on the camshaft duration and timing. DVVT optimises this with different timing below and above 3000rpm.
This is all assuming the car is tuned for fuelling correctly at all rev ranges.
Has anyone else tried this and what results do you get? Be very interesting to see if all the YRV turbos are performing differently!
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Just call me G...
2004 Yellow YRV Turbo
Yes this is exactly what I am
Yes this is exactly what I am reffering to. It's almost like it's changing gear except that the revs only drop slightly, more of a "dip" really. I know jon (jpor) experiences the same thing. Mine seems to do it in 2nd and 3rd gear, only in steershift and regardless of throttle position.
Cheers for checking yours, like you say would interesting what the other owners say.
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2004 Yellow YRV Turbo