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| Author | Subject: 6th gear upgrade or gearbox swap |
 atgti6
Newbie  Location: winchester Registered: 19 Jan 2014 Posts: 10 Status: Offline |
Post #1
Hi all im new to the club and I am looking for some help!I have a gti 6 and the gearbox ratios are irritating me, is there a 6th gear upgrade to make it longer so I can lower the engine rev in 6th? OR does anyone know if there is a different gearbox that will fit, that will give me better mpg. any advice is appreciated! Thanks |
 Posted 19th Jan 2014 at 15:55
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scotzman
Seasoned Pro  Location: Dundee Registered: 24 Jun 2011 Posts: 1,408 Status: Offline |
Post #2
What mpg are you getting?They don't rev overly high in 6th at motorway cruising speeds. ________________________________________ '90 1.6 205 GTi, '98 306 GTi-6 |
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Posted 19th Jan 2014 at 16:27
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atgti6
Newbie Location: winchester Registered: 19 Jan 2014 Posts: 10 Status: Offline |
Post #3
I'm not really sure about mpg but barely getting 300 miles to a tank, and I'm not driving it hard. Mine revs at 2750@ 60 in 6th and about 3500@ 70 in 6th. This is a bit excessive for 6th gear |
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Posted 19th Jan 2014 at 16:44
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woody.
Senior User  Location: London Registered: 18 May 2009 Posts: 799 Status: Offline |
Post #4
Probably your lambda sensor giving up if you're getting poor mpg. Have a search as there's numerous other threads about mpg |
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Posted 19th Jan 2014 at 16:46
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pugheaven
Seasoned Pro  Location: Fareham Registered: 17 Dec 2006 Posts: 4,602 Status: Offline |
Post #5
Iirc you can change it for the diesel 5th gear which will go e you around 2k rpm at 70 |
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Posted 19th Jan 2014 at 17:04
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atgti6
Newbie Location: winchester Registered: 19 Jan 2014 Posts: 10 Status: Offline |
Post #6
Kl do you know if the diesel 5th gear will swap straight out? Is that the 5th gear from the 306 2ltr hdi |
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Posted 19th Jan 2014 at 17:19
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pugheaven
Seasoned Pro Location: Fareham Registered: 17 Dec 2006 Posts: 4,602 Status: Offline |
Post #7
So I'm led to believe and yes the hdi one, not sure what you acceleration will be like with it fitted tho |
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Posted 19th Jan 2014 at 17:41
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #8
atgti6 wrote: I'm not really sure about mpg but barely getting 300 miles to a tank, and I'm not driving it hard. Mine revs at 2750@ 60 in 6th and about 3500@ 70 in 6th. This is a bit excessive for 6th gear You have something wrong with your car...  Recently I managed to get 224 miles to the first half of a tank from a fill-up, doing a solid 70 mph on the motorway. As you can see from my signature, my GTi-6 is supercharged running 454bhp. If I can manage that fuel economy on a motorway run then yours should easily do it. I suspect your lambda sensor is probably giving up the ghost. The ratios in this gearbox are perfectly suited for the road, with 6th being a lovely cruising gear. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone  |
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Posted 19th Jan 2014 at 17:44
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scotzman
Seasoned Pro Location: Dundee Registered: 24 Jun 2011 Posts: 1,408 Status: Offline |
Post #9
Has anyone ever tried that gear conversion? I suspect the engine might be a bit bogged down at those revs at 70 and your MPG probably wouldn't be improved.As said at constant motorway driving I can get 450+ miles from a tank easily and normal day to day use is 360+. ________________________________________ '90 1.6 205 GTi, '98 306 GTi-6 |
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Posted 19th Jan 2014 at 17:50
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pugheaven
Seasoned Pro Location: Fareham Registered: 17 Dec 2006 Posts: 4,602 Status: Offline |
Post #10
I know a few people with gti6 turbo conversions that have changed 6th gear to the hdi 5th, I agree that something is wrongfor you to get poor mpg but lowering the rpm at motorway speeds will always be a good thing! And Stan driving off "boost" is essentially the same as driving a standard six so you having 454bhp has nothing to do with it..... |
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Posted 19th Jan 2014 at 17:58
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atgti6
Newbie Location: winchester Registered: 19 Jan 2014 Posts: 10 Status: Offline |
Post #11
Cheers il think about the diesel 5th gear swap out.I have never got more than 365 miles to a full tank! The gear ratios are too close together, unless you only interested in racing it to max revs. I only use 1st 2nd 4th 6th because 3rd and 5th are too similar to 4th and 6th. I don't commute on motorways so don't expect to get great mpg. |
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Posted 19th Jan 2014 at 18:02
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atgti6
Newbie Location: winchester Registered: 19 Jan 2014 Posts: 10 Status: Offline |
Post #12
I hear what your saying about the lambda sensor and Il change that first to see what improvement I get! |
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Posted 19th Jan 2014 at 18:09
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #13
pugheaven wrote: And Stan driving off "boost" is essentially the same as driving a standard six so you having 454bhp has nothing to do with it..... I know, but there is a feeling out there that once charged, regardless of speed they are worse on fuel. I was merely pointing out that that isn't the case. If anything, mines slightly better than when it was standard. ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 19th Jan 2014 at 19:36
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JWP EFi
Turbo Legend!  Location: edinburgh Registered: 07 Mar 2010 Posts: 2,163 Status: Offline |
Post #14
Stan, i don't understand how it can be better on fuel as your on lower compression meaning it would be less efficient, obviously good mapping will help but your also consuming power by driving the charger |
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Posted 19th Jan 2014 at 22:29
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buzzbrightyear
Seasoned Pro  Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,901 Status: Offline |
Post #15
I know what the op means, when your used to other cars that rev low and are silent at 70-80 and you get in a 6 it feels like your revving the absolute tits off it on the motorway, then you look at the rev counter and although it's quite high it's not asHigh as it seems. ________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 19th Jan 2014 at 22:45
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stan_306gti6
Forum Admin Location: Kent Registered: 18 Jan 2004 Posts: 21,768 Status: Offline |
Post #16
T99PUG wrote: Stan, i don't understand how it can be better on fuel as your on lower compression meaning it would be less efficient, obviously good mapping will help but your also consuming power by driving the charger Yep, I know exactly what you're saying mate, however the MPG speaks for itself. I was really surprised to get that kind of consumption on a long run I must say as I expected worse, but there you are. Having said that though, on the same trip I did manage to use 1/3 of a tank to only 28 miles when really playing hard in the French Alps.  ________________________________________ "Supercharged - 454.1bhp/317.5lb/ft"Peugeot 306 GTi-6 2000 (X), Moonstone |
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Posted 20th Jan 2014 at 07:31
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scotzman
Seasoned Pro Location: Dundee Registered: 24 Jun 2011 Posts: 1,408 Status: Offline |
Post #17
buzzbrightyear wrote: I know what the op means, when your used to other cars that rev low and are silent at 70-80 and you get in a 6 it feels like your revving the absolute tits off it on the motorway, then you look at the rev counter and although it's quite high it's not as High as it seems. Should try my 1.6 205 then, around 4K at 70mph and its not the quietest  ________________________________________ '90 1.6 205 GTi, '98 306 GTi-6 |
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Posted 20th Jan 2014 at 08:08
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m306
Seasoned Pro  Location: south coast Registered: 16 May 2011 Posts: 1,074 Status: Offline |
Post #18
buzzbrightyear wrote: I know what the op means, when your used to other cars that rev low and are silent at 70-80 and you get in a 6 it feels like your revving the absolute tits off it on the motorway, then you look at the rev counter and although it's quite high it's not as High as it seems. Yeah i agree, the gti6 revs a whole 1000rpm higher at 70 than my megane does. ________________________________________ supercharged China gti6 - Thu 16th Sep 1999 - sold2010 megane rs250 |
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Posted 20th Jan 2014 at 09:57
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superchargedblack1997gti6
Seasoned Pro  Location: guildford Registered: 15 Aug 2009 Posts: 2,376 Status: Offline |
Post #19
Is this a confirmed swap? As the supercharged cars could benefit from this for ultimate top speed?Can anyone confirm this as having been done ? chers ________________________________________ Super high boost Completed, destroyer of gearboxes and 160mph club |
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Posted 20th Jan 2014 at 10:59
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pugheaven
Seasoned Pro Location: Fareham Registered: 17 Dec 2006 Posts: 4,602 Status: Offline |
Post #20
Iirc pug performance have done it for a few customers |
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Posted 20th Jan 2014 at 12:23
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superchargedblack1997gti6
Seasoned Pro Location: guildford Registered: 15 Aug 2009 Posts: 2,376 Status: Offline |
Post #21
Cheers mate just seems like an idea to get done at the same time the straight cut gears go in. no need to use 6th until 140mph anyways so thought this should give a top speed of approx 190?________________________________________ Super high boost Completed, destroyer of gearboxes and 160mph club |
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Posted 20th Jan 2014 at 12:31
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buzzbrightyear
Seasoned Pro Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,901 Status: Offline |
Post #22
m306 wrote: buzzbrightyear wrote: I know what the op means, when your used to other cars that rev low and are silent at 70-80 and you get in a 6 it feels like your revving the absolute tits off it on the motorway, then you look at the rev counter and although it's quite high it's not as High as it seems. Yeah i agree, the gti6 revs a whole 1000rpm higher at 70 than my megane does. Yep but I just look at it as the characteristics of the car, if we really don't like it then we have the wrong car and should just go get a 6 speed big engined diesel that revs at 2k at 70-80 ________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 20th Jan 2014 at 14:03
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buzzbrightyear
Seasoned Pro Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,901 Status: Offline |
Post #23
superchargedblack1997gti6 wrote: Cheers mate just seems like an idea to get done at the same time the straight cut gears go in. no need to use 6th until 140mph anyways so thought this should give a top speed of approx 190? Would you really want to do 190 in a 306 though?  ________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 20th Jan 2014 at 14:05
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superchargedblack1997gti6
Seasoned Pro Location: guildford Registered: 15 Aug 2009 Posts: 2,376 Status: Offline |
Post #24
Andy do you actually use the six speed in youres. I think that it would be awesome for mega top speed in our boxs?________________________________________ Super high boost Completed, destroyer of gearboxes and 160mph club |
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Posted 20th Jan 2014 at 14:06
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buzzbrightyear
Seasoned Pro Location: hiding all receipts for car Registered: 09 Jul 2008 Posts: 11,901 Status: Offline |
Post #25
Yes mate use 6th loads, doubt I would if it was that high though________________________________________ andrew315rawson@live.co.ukMoonstone phase 7 gti6 My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1 |
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Posted 20th Jan 2014 at 14:34
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