GolfGTIforum.co.uk
Model specific boards => Golf mk4 => Topic started by: Big Tone on 10 September 2010, 20:26
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As above, what is the top speed of a 20vT once its been mapped?
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As above, what is the top speed of a 20vT once its been mapped?
Same as pre-map
You're limited by the gearing and aerodynamics
The biggest change is how quickly you get there
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What is that then? Don't really fancy trying it, I have my :shocked:limits, and so do the roads
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138mph if you believe the figures on Parkers
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I asked this question last night :wink:
http://uk-mkivs.net/forums/t/376580.aspx
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I hit 146 (on a private runway) in mine with a map, that was on sat nav, :lipsrsealed: speedo was over 150
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Would a six speed box make this faster? Or would each gear just be shorter?
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A six speed box will give a higher top speed
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Nice one
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I hit 137 or there about wasnt realy much left probs 1 or 2 mph that was after a remap aswell.
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A six speed box will give a higher top speed
it wouldnt, power is whats needed, a standard 150 would never max out 5th.
and isnt the 6 speed just a shorter shift with same final drive?
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Sorry for bit of a hijack but ive only took my car to 115-120 but when i get there the steering feels all wooley like its starting to snake down the road just wondered if anyone had any ideas all the bushes seem to look fine visually..
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A six speed box will give a higher top speed
it wouldnt, power is whats needed, a standard 150 would never max out 5th.
and isnt the 6 speed just a shorter shift with same final drive?
I think you'll find it would :rolleyes:
An o2j 5 speed is 23.9mph/1000rpm, so with a 6700rpm rev limit gives 160mph theoretical maximum.
With a max rev limit of 8200rpm(big turbo guys), you get 196mph
An 02m 6 speed is 24.6mph/1000rpm, so this gives 165mph, and 202mph
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A six speed box will give a higher top speed
it wouldnt, power is whats needed, a standard 150 would never max out 5th.
and isnt the 6 speed just a shorter shift with same final drive?
I think you'll find it would :rolleyes:
An o2j 5 speed is 23.9mph/1000rpm, so with a 6700rpm rev limit gives 160mph theoretical maximum.
With a max rev limit of 8200rpm(big turbo guys), you get 196mph
An 02m 6 speed is 24.6mph/1000rpm, so this gives 165mph, and 202mph
You know to much :nerd:
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Wilko posted the info in the thread i started :wink:
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O right :smiley:
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Sorry for bit of a hijack but ive only took my car to 115-120 but when i get there the steering feels all wooley like its starting to snake down the road just wondered if anyone had any ideas all the bushes seem to look fine visually..
Steering does seem to ge very light higher up., when my golf was stock we took it for a top speed run and it started snaking and spun off at 120mph, now lowered and remaped etc it feels alot more safer at 120, however at 130 the steering seems to get light and at 140 it feels like it wants to repeat the incident all over....
Not sure what effects the light steering as in my mates LCR mk2 at 170mph it just feels sturdy, same is said for the s3 at silly speeds.
My bushes and tracking are also fine, maybe some one might have an idea why steering goes very light higher up, like is it due to lift etc...?
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Yer thats exactly right.. mine is relatively standard at the moment but i just get worried pushing it incase i lose control of the bleeding thing there must be a reason why the front is lifting up.. maybe if we go an adjustable splitter made up give us a bit of down force ?? :shocked:
Dan
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Yer thats exactly right.. mine is relatively standard at the moment but i just get worried pushing it incase i lose control of the bleeding thing there must be a reason why the front is lifting up.. maybe if we go an adjustable splitter made up give us a bit of down force ?? :shocked:
Dan
Could be, I was discussing this with a mate as well, standard splitter gves it a boat shape which is why it may generate lift, but I think we need some physicists in the house, it's not good when you don't feel confident in your car, as long term this is becoming a low entry track toy for me. I know what I roughly want from it and whats left to do and some of the minor extra's it needs.
Asjustable splitters would be cool, its like the CTR boys get there little side wings, then more and more cars are getting rear diffusers and flat underbody's to accomadate better air flow. We are handicapped :grin:
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We are only a few years behind people its not to bad.. i might try and get a R32 front bumper and get a carbon fibre splitter for that if i cant get one i might make one.. last year at trax there was a doge viper with a huge front carbon adjustable splitter it looked the bollocks :)
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Be cool to fabricate some extra's to the golf, like a new front undertray and adjustable or different splitter. For a 99 onwards car they were good, I remember my mk4 6n polo even though it was 96reg it was way ahead of its competitors interior and extrerior wise in comparison to the saxo, fiesta etc..
I love the diffusers for touring cars etc especially around the arches, but a golf is not that type of car, but improving the front could be a good start from splitter and undertray. I would say flatten its belly, but speed bumps are a pain already :grin:
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But if you flatten the belly you can slide over speed bumps :) It definately needs something to pull the front down but whatever we fabricate it needs to be easily removed otherwise you could be an hour just removing undertray lol Im definately tempted to get a cheap bumper off ebay and have a go at testing :)
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But if you flatten the belly you can slide over speed bumps :) It definately needs something to pull the front down but whatever we fabricate it needs to be easily removed otherwise you could be an hour just removing undertray lol Im definately tempted to get a cheap bumper off ebay and have a go at testing :)
Going to have to look out what splitters are on the market as i hate the anni one somthing thicker and sticking out, developing a new undertray could be easy. For me it will be permanent so removal is not an option, but I do love the "AeroCatch" mechanisms being used on cars to fasten panels together or the DZUS straps/fasteners.
Be good to make something though as this was what was making me steer off the golf for some time and debating a "TT mk1 1.8T K04" for a track project as them lads have tractions control, esp, 4wd and talk alot more about discussions especially on the downforce side as well as different rear spoilers. Only thing thats making me stick with the golf is it still has potential and with all the work done so far switching to the TT would be a waste of time and money especially in price difference. then the golf is more fun to drive as none of that "fancy sh!t" like traction control. :laugh:
So what do you do for a living tech as it would be intresting if you could develop anything?
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I work for the metropolitan police for a living and cars have been my hobby/life for years.. I have picked up a few bits and bobs over time :)
Yes the aero catches seem a good idea.. could also make up some kind of catch to hold the bumpers on for easy removal and refitting like the track cars have.. i think Jake is making his bumpers quick release for speed at the track..
Dan
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PC in the met? I work for the courts, hoping to get out of all that nonsense soon. Was looking at joining the met myself but things have gone tits up in terms of recruitment as I know alot of the officers down Bromley and alot of the traffic team for SE region including some of the marlowe house team down sidcup.
Jake's project looks intresting can't wait till his wide body kit is on as well as additional things he might end up doing to it aerodynamically. But his plans are solid and the outcome will definetly be intresting.
Think I will have to start researching and getting a book on car aerodynamics :grin:
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Nope just a pcso at the moment testing the water seeing if i want to become a PC at a later date.. Yer recruitment has all gone tits up will start again in a couple of years..
I have started another thread asking people they're ideas on ways to produce downforce be good to see some answers.. Getting a book would be a good idea.. There was a guy who made a 200sx from a bare shell and he was amazing with aerodynamics and downforce etc each panel was custom and it looked amazing apparently because the car was so aerodynamic he didnt as much power as the competition because his car just glided around the track..
Dan
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A six speed box will give a higher top speed
it wouldnt, power is whats needed, a standard 150 would never max out 5th.
and isnt the 6 speed just a shorter shift with same final drive?
I think you'll find it would :rolleyes:
An o2j 5 speed is 23.9mph/1000rpm, so with a 6700rpm rev limit gives 160mph theoretical maximum.
With a max rev limit of 8200rpm(big turbo guys), you get 196mph
An 02m 6 speed is 24.6mph/1000rpm, so this gives 165mph, and 202mph
you said that word there though, theoretical, its not the gearing thats limiting the gti, its wind resistance vs power. the way i read his post it sounded like he just thought if he bolted a 6 speed box onto his car right now, would it make it faster, and the answer is no it wouldnt.
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A six speed box will give a higher top speed
it wouldnt, power is whats needed, a standard 150 would never max out 5th.
and isnt the 6 speed just a shorter shift with same final drive?
I think you'll find it would :rolleyes:
An o2j 5 speed is 23.9mph/1000rpm, so with a 6700rpm rev limit gives 160mph theoretical maximum.
With a max rev limit of 8200rpm(big turbo guys), you get 196mph
An 02m 6 speed is 24.6mph/1000rpm, so this gives 165mph, and 202mph
you said that word there though, theoretical, its not the gearing thats limiting the gti, its wind resistance vs power. the way i read his post it sounded like he just thought if he bolted a 6 speed box onto his car right now, would it make it faster, and the answer is no it wouldnt.
Again your wrong fella.
If a five speed car was fitted with a six speed box it's top speed would increase,at any given rpm the six speed box WILL give a higher speed due to the higher mph per 1000rpm ratio.All std 1.8t's will reach the rev limit.
It's pretty simple when you think about it :laugh:
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how? youve just said the thoretical top speed of a 5 speed box is 160mph, yet the actual top speed is 135, therefore the engine doesnt reach its maximum revs, fitting a 6 speed box would drop the revs needed for the same speed, but this could actually lower the top speed if the torque is reduced, not sure where the 1.8t lies with this.
i saw it with my old fiesta 1.0, had a 4speed box and managed 90mph (private test track :lipsrsealed:) fitted a 5 speed box and it wouldnt even reach 80
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Most 6spd boxes use 6th as a overdrive, top speed is reached in 5th.
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Most 6spd boxes use 6th as a overdrive, top speed is reached in 5th.
exactly :smiley:
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how? youve just said the thoretical top speed of a 5 speed box is 160mph, yet the actual top speed is 135, therefore the engine doesnt reach its maximum revs, fitting a 6 speed box would drop the revs needed for the same speed, but this could actually lower the top speed if the torque is reduced, not sure where the 1.8t lies with this.
i saw it with my old fiesta 1.0, had a 4speed box and managed 90mph (private test track :lipsrsealed:) fitted a 5 speed box and it wouldnt even reach 80
It's just not sinking in with you is it :laugh:
What was the mph/rpm ratio of the fiesta box's? Without knowing those it's a flawed argument.
Here are the simple facts for you again......................
The 02J 5 speed box 23.9/1000rpm and gives a top speed of 160.13mph@6700rpm
The 02M 6speed box is 24.6/1000rpm with a top speed of 164.82@6700rpm.
Lets take a simple stage one mapped AGU that will easily reach the rev limit in fifth,stick an 02M box on there and the top speed would increase.Testing this out on the highway would be both stupid and dangerous,but it would be faster.
Can i ask where you get a top speed of 135mph from?
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i read 138mph earlier in thread but for some reason i wrote 135????
dunno what the fiesta box was, that was back in my days of bodging and believing what the scrap yard owner tells me, lol, cant even tell you what revs it was at cos it had a clock instead!
i do not believe that a mapped 1.8t would reach the rev limit in 5th, that is my main argument, read what shakey says on page 1, 137mph and it was reaching its plateu even after a remap, of course if it could reach the limit then the 6 speed would be faster.