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Thread: Which cabrio?

  1. #201
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    Quote Originally Posted by adrianw View Post
    Equal toe would just cancel each other out, other than tyre wear it will make no difference to handling,
    Well, it does affect understeer; more is less ;-)
    Also does no good to straight line stability and tram lining.
    Anyway, it´s OEM now save for the negative camber.
    With no PAS and the mid engine lay-out, changes are very noticeable; I like the way it is going.

    Would have loved combine the camber bolts and alligning with fitting 30 mm shorter progressive TEIN springs for both lower centre of gravity and so much nicer looks, but the ground clearance, no, no, NÓ.

    Time to get serious about lighter rims ... and real rubber tyres instead of these nogrip gladial type cancer dust specials.
    2 kg off each corner and proper grip will be só much more confidence inspiring.

    Input about tyres is welcome.
    Will go 195/50R15 and 205/50R15.
    When the going gets tough, the DAF gets going.

  2. #202
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    When the going gets tough, the DAF gets going.

  3. #203
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    The strawberries where 5€ for two 2 kg. boxes on the market this morning :D
    So; one box for the mountain, one box for the coast.








    The idea behind the bonnet vents is pressure relief in the frunk = less pressure under the car = less lift = more stabilty (read less instability) at speed. Even if just a bit.

    Waiting for the aero lip to stick onto the rear to improve the drag which should do the same and reduce sensitivity to side wind.
    When the going gets tough, the DAF gets going.

  4. #204
    Quote Originally Posted by Huertecilla View Post
    The strawberries where 5€ for two 2 kg. boxes on the market this morning :D
    So; one box for the mountain, one box for the coast.



    The idea behind the bonnet vents is pressure relief in the frunk = less pressure under the car = less lift = more stabilty (read less instability) at speed. Even if just a bit.

    Waiting for the aero lip to stick onto the rear to improve the drag which should do the same and reduce sensitivity to side wind.
    You've been reading my stuff! venting the bonnet won't do you any favours, the airflow hitting the windscreen will create more drag, the vents need to be on the wings.

    As it is a hot country and the car is normally aspirated wrapping the exhaust is worth a few horsepower and less heat in the engine bay.

  5. #205
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    Quote Originally Posted by adrianw View Post
    You've been reading my stuff! venting the bonnet won't do you any favours, the airflow hitting the windscreen will create more drag, the vents need to be on the wings.

    As it is a hot country and the car is normally aspirated wrapping the exhaust is worth a few horsepower and less heat in the engine bay.
    I did read your links and a lot more.
    There are more ways to Rome and also Rome is not the only destination.

    Unfortunately the wings are not a feasable option.

    The wee bit extra airstream hitting the windscreen will álso result in downforce. As topspeed is not even in síght as an issue an increase of drag there is not either. I expect the effect to be marginal and hope the addition of the rear strip will work in combination, reducing the drag thus equalling out.

    I´ll find out. Without the PAS everything is ever so directly felt in the hands. I was disappointed that the strip has not arrived yet, but tis way I will feel the differences. Íf there is something to feel that is....

    Concerning cooling I hope even a slight increase in flow will help.
    Permission for a reduced registration plate up front is still on the roll. Again not much of a difference expected but still it wíll make a difference. The less restricted entry will allow more air in and the vents are in anticipation.
    Thís one I on purpose put last.
    Well, not all as there is still the bl@@dy big wing I may or may not bolt onto the rear.
    When the going gets tough, the DAF gets going.

  6. #206
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    When the going gets tough, the DAF gets going.

  7. #207
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    Went down the mountain, took a detour and a bit of extra highway; the hígh way, literally; the toll road to Málaga. A piece of road building art linking tunnels to long; high viaduct to tunnels to etc.
    Very little traffic, smooth tarmac, wide curves and the occaional STRONG winds through the valley crossed by the viaduct.
    Overtook a few lorries with strong crong crosswing at about 160 km/h.

    Ok, the difference.
    1. With my car the left front corner of the bonnet started to ´lift´ at 60 km/h.
    Now it stays put till 160 :o
    2. At 160 passing a lorry with strong sidewind, the car is more stable than before at 140 on its own.
    3. The surprise was the notable reduction of buffeting. It is logical but unexpected.
    More of a difference, wáy more, than expected.

    All in all a success. It looks better than I expected and the result is beyond what I could have imagined.
    Rather a large difference from a few narrow slits.
    Reasoning it; the location and the design probably create a low pessure zone efficiently extracting the air at a higher pressure under the bonnet.
    The extra air means more mass of air rushing over the windscreen, thus rolling over just a bit further back behind it.

    Hope the rear lip arrives Friday. Can´t wait to try that out now.
    When the going gets tough, the DAF gets going.

  8. #208
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    Back in the mountains again.
    It was tough at the coast.





    Yes, noticed the difference consistently.
    Took the interior ´scenic´ route through the valley. That is a second norm route showing differences. This time the camber/allignment ánd the bonnet vents since the previous time I travelled it.
    Verdict; more planted at the front.
    When the going gets tough, the DAF gets going.

  9. #209
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    Aero gadgets






    Should work a treat; change drag, create a proper wake, even extract more air from the engine bay.
    When the going gets tough, the DAF gets going.

  10. #210
    Quote Originally Posted by Huertecilla View Post

    Should work a treat; change drag, create a proper wake, even extract more air from the engine bay.
    Hmmm air in engine bay! how long have you got? very little air goes in, you will find that you don't have laminar air flow on the sides, you will need to play with vortex generators to make the airflow re attach, the ducts do nothing, the first thing to do is remove the grill at the back.

  11. #211
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    Quote Originally Posted by adrianw View Post
    Hmmm air in engine bay! how long have you got? very little air goes in, you will find that you don't have laminar air flow on the sides, you will need to play with vortex generators to make the airflow re attach, the ducts do nothing, the first thing to do is remove the grill at the back.
    The SW30 has a side entry which does very little, true.
    The ´diaper´ though, in combo with the subframe, does direct some of the air under the car up in the engine bay.
    I have already removed the drip trays from under the louvres, freeing up any flow there might be.

    The upper rear gril is very open structure. Taking it out should do next to nothing.
    The lower one is largely closed. That woúld add a serious opening. Not sure why it closed, so leaving that as is for the moment.
    The lip should create a wake, reduce turbulence, right where the upper grill is. Shoúld improve air flow, however little. It is basically all marginal but that lip does work very effectively. Ok, within the framework of limited expectations.

    Coming Tuesday is father´s day in Spain but no takers for the large rear wing as present ;-)
    Last edited by Huertecilla; 15th March 2019 at 13:34.
    When the going gets tough, the DAF gets going.

  12. #212
    Calculate the area of the grill you will get a shock, underneath the car is a low pressure area, there is no airflow there

  13. #213
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    Quote Originally Posted by adrianw View Post
    Calculate the area of the grill you will get a shock, underneath the car is a low pressure area, there is no airflow there
    I measured front, rear and side vents.

    As to no airflow under the car I beg to differ.
    The underside it surprisingly important as the air on the ground is partically still.
    Hence flat bottoms and some sort of diffuser makes such huge difference. In the MX5 scene taking off the rear bumper is fairly popular for track use and with good, proven aerodynamic reason.
    When the going gets tough, the DAF gets going.

  14. #214
    Quote Originally Posted by Huertecilla View Post
    I measured front, rear and side vents.

    As to no airflow under the car I beg to differ.
    The underside it surprisingly important as the air on the ground is partically still.
    Hence flat bottoms and some sort of diffuser makes such huge difference. In the MX5 scene taking off the rear bumper is fairly popular for track use and with good, proven aerodynamic reason.
    OK think about it, do you think a volume car manufacturer would deliberately design a car to produce lift, they are not race cars so not perfect, however they will do everything they can to minimise lift.

  15. #215
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    Quote Originally Posted by adrianw View Post
    OK think about it, do you think a volume car manufacturer would deliberately design a car to produce lift, they are not race cars so not perfect, however they will do everything they can to minimise lift.
    Yes, have thought about it and yes they have minimises lift ánd there is soem.
    As you say it is not a race car.
    Also a ´mass produced´, competitively priced one for a fairly wide public.
    As such it is a pretty good compromise but still a compromise and some lift at illegal speeds is a well known ´issue´.
    Now I have a bit less.

    Take a look at the first Audi TT. Quite a reputable manufacturer who know what they are doing yet the rear end was a bit of a mess aerodynamically. A duck tail spoiler lip was a quick fix improving the drag/wake.
    The SW30 is comparable at the rear. A small lip creating a shear ridge improves things. Toyota offered something alike as a dealer fix for customers who complained about side wind sensitivity.

    Took mountain love for a spin and she volunteered noticing less buffeting from 80 km/h and most markedly at 120; ´did you change something? There is less wind noise, less disturbance!!´

    The rear lip is a minor thing but;
    - it contributes tothe less turbulant air flow over the tub; that is not subjective
    - the rear feels just that bit more planted; that may very well be subjective
    When the going gets tough, the DAF gets going.

  16. #216
    Quote Originally Posted by Huertecilla View Post
    Yes, have thought about it and yes they have minimises lift ánd there is soem.
    As you say it is not a race car.
    Also a ´mass produced´, competitively priced one for a fairly wide public.
    As such it is a pretty good compromise but still a compromise and some lift at illegal speeds is a well known ´issue´.
    Now I have a bit less.

    Take a look at the first Audi TT. Quite a reputable manufacturer who know what they are doing yet the rear end was a bit of a mess aerodynamically. A duck tail spoiler lip was a quick fix improving the drag/wake.
    The SW30 is comparable at the rear. A small lip creating a shear ridge improves things. Toyota offered something alike as a dealer fix for customers who complained about side wind sensitivity.

    Took mountain love for a spin and she volunteered noticing less buffeting from 80 km/h and most markedly at 120; ´did you change something? There is less wind noise, less disturbance!!´

    The rear lip is a minor thing but;
    - it contributes tothe less turbulant air flow over the tub; that is not subjective
    - the rear feels just that bit more planted; that may very well be subjective
    Is that k or MPH, my friend Mark has one with a supercharged 2.0 tuned Celica engine making 360bhp, at snettertton I could make it slide but mot move about. He also has a stripped out standard one for trackdays

  17. #217
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    As planned; inland route to the coast, old N340 eastwards, oldest bit of N340, then from Almuñecar over the N4050 to Granada.

    Whereas the N340 is the original Routse 66 so to speak, the N4050 must be one of thé unspoiled riders´ routes; almost 50 kms of varied driving heaven. The old name for the rout is ´la ruta de suspiro del moro´; ´the route of the moor´s sigh´. It is indeed breathtaking for most of the 50 kms.

    On the remnants of the pre war N340 we encountered a Cabra montés; a wild mountain goat. A more extreme example of how out of use those 4 kilometers are would be hard to think of.

    Oh and the car was a dream!



    Charming company;
    ´Ooooohhhh I lóve those pop noises´ about the occasional afterburn exhaust sounds on the overrun.
    ´...and why would you want that wing? For what extra traction/stabilty?? You already ignore speed limits by several factors!!´




    When the going gets tough, the DAF gets going.

  18. #218
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    Mrs V used to own a Mk1 before I met her. Last week I sold the very practical but boring Toyota Auris and I bought her a one owner FSH Mk3 - we are now a soft top household


  19. #219
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    Cool

    Quote Originally Posted by Velorum View Post
    Mrs V used to own a Mk1 before I met her. Last week I sold the very practical but boring Toyota Auris and I bought her a one owner FSH Mk3 - we are now a soft top household


    That is rather romantic!

    My Málageña love has Peugeot 307cc.

    Wishing you much topless fun!!
    When the going gets tough, the DAF gets going.

  20. #220
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    Cool

    Drove the 307 yesterday at the coast.
    Over the N340 as well, much the same bit as Saturday in the MR.
    Whát a difference!!

    Both compact convertibles with 140 hp.
    2+2 versus strictly 2 is not the crux.
    Neither is it being 50% heavier.
    It is the FF vs MR.
    The bulk of the larger mass up front being púlled ahead makes for a HUGE difference: The concept is inherently much more stable. It is like a baseball with a tail vs a pingpong ball.
    Quite relaxing btw for touring the N340 under the sun.
    When the going gets tough, the DAF gets going.

  21. #221
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    Not much sun here!

    Since Mrs V's MK3 arrived its had the hood up

    I dropped mine yesterday on the drive back from Sussex to Berkshire. Wearing a cap, scarf and gloves and with the heater blowing it was most pleasant - however it wasn't long before the rain put a stop to that!

  22. #222
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    Quote Originally Posted by Velorum View Post
    Not much sun here!

    Since Mrs V's MK3 arrived its had the hood up

    I dropped mine yesterday on the drive back from Sussex to Berkshire. Wearing a cap, scarf and gloves and with the heater blowing it was most pleasant - however it wasn't long before the rain put a stop to that!
    Thanks for sharing that!

    Memories of both the previous (4x4) ragtop with which I ventured high up into the Sierras in winter suited up in motorcycle gear :-)
    Memories of driving the Spitfire 1500 in the Netherlands. Bought a tonneau to keep most of the rain out. Vinyl seats and rubber floor matting (cut away the carpeting from the footwells) were quite useful.

    Coming back up from Málaga there were near black clouds above Las Pedrizas pass but since the hood is put up in seconds I kept it down and the few rain drops did not even wet the windscreen.
    Unfortunately that was all the rain that sofar has fallen out of the ´promised´ three wet days. All sunny forecasted till Tuesday next week. Máybe a shower tomorrow afternoon.
    When the going gets tough, the DAF gets going.

  23. #223
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    Quote Originally Posted by Huertecilla View Post





    That looks a bit familiar. My brother has a place in one of the villages in the Valle de Lecrín. It's a bit remote for my taste, but he and his mrs. like it.

  24. #224
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    Quote Originally Posted by Incredible Sulk View Post
    That looks a bit familiar. My brother has a place in one of the villages in the Valle de Lecrín. It's a bit remote for my taste, but he and his mrs. like it.
    Well spotted!!

    The Valle de Lecrín is a fairly extensive region though with enórmous differences in local climates and remoteness. The northern bit borders the city of Granada.
    Only just to the south are subtropical vallye but the northwestern part of V.de Lecrín is a barren, tundra-like high plane where the few hamlets/villages sit less exposed in small depressions or gorges.
    The rouds though and the views are WOW-factor.
    When the going gets tough, the DAF gets going.

  25. #225
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    Talking ....and now for something completely different

    When the going gets tough, the DAF gets going.

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