Set of cogs to gear up your 8V GTI in 5th gear

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Mike E (uk)
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Set of cogs to gear up your 8V GTI in 5th gear

Post by Mike E (uk) » Sat Dec 17, 2005 11:16 am

I am having a bit of a BX parts clear out this season,

18 months ago, I modified my 16V gearbox to improve top gear cruising.

I am VERY pleased with the result, and in the process I got a spare set of 16V gearbox 5th speed cogs.

These are what you need to gear up an 8V GTI in a similar way.

The 8V engine has more torque at lower speeds than the 16V, so the mod saves you even more rpm than on the 16V car.

This reduces noise and saves fuel, making a more relaxing motorway drive.

A handy thing is that you do not need to remove the gearbox to do this.
The cogs are accessable under the n/s wheel arch.

For a GTi this gives:
was 21.6mph per 1000rpm
modified 24.7 mph per 1000rpm

70mph was 3237rpm, modified is 2832rpm

Mike
Last edited by Mike E (uk) on Sun Dec 18, 2005 11:29 am, edited 1 time in total.

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sleepy0905
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Post by sleepy0905 » Sat Dec 17, 2005 9:48 pm

will it work on a 1.9 TGD and reduce the revs at the top end which would reduce the fuel consumption more if so how much for them. :D
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Post by Jaba » Wed Dec 28, 2005 8:22 am

The answer to Sleepy's question is no I'm afraid.
These gears only work on the 8v GTi.
The Joy of BX with just one Citroën to my name now. Will I sing Bye Bye to my GTI or will it be Till death us do part.

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Post by sleepy0905 » Wed Dec 28, 2005 8:52 am

ok thanks is it right that turbo 5th gear will do the job :?:
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Post by jeremy » Wed Dec 28, 2005 9:00 am

I doubt if dropping the revs in 5th will save anything on a 1.9D engine - in fact the opposite may well be true as the thing won't have the power to pull 5th most of the time and you will probably have to use 4th most of the time.

Remember that a diesel engine cuts off all fuel on the overrun and is at its best on part throttle.

The torque of the 1.9D is about 90 lb/ft and the 1.7 turbo engine is 133 lbft which is how it pulls the very tall 5th gear.

jeremy

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Post by sleepy0905 » Wed Dec 28, 2005 9:07 am

ok thanks for the advice. :roll:
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tim leech

Post by tim leech » Wed Dec 28, 2005 9:14 am

You could always slow down sleepy! Lol or pedal llike I do in my 19D
Went to Kens yesterday in the TZD with my mate infront in a 4.0 V8 Landrover, had a sore right foot from having it pushed into the rubber mat!

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Post by sleepy0905 » Wed Dec 28, 2005 9:44 am

What do you mean slow down my lady loves to cruise at 85 she will happily do that all day without moaning but the revs are at about 3600 Rpm
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Post by tom » Wed Dec 28, 2005 9:51 am

As they bloody well should be. Don't you think that better minds than yours would have calculated the CORRECT gear ratios for your car?

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Mike E (uk)
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Post by Mike E (uk) » Wed Dec 28, 2005 12:39 pm

No :lol:


Mike

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Post by tom » Wed Dec 28, 2005 12:59 pm

Thought not. What you have done is introduced a big hole between fourth and fifth, lost your fifth gear acceleration and reduced your top speed by a couple of MPH as the engine won't pull peak RPM. Having to drop to fourth to overtake and changing up later to avoid the hole will mean that you don't save any fuel either although I concede that the car may be quieter.

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5th gear mod.

Post by Mike E (uk) » Wed Dec 28, 2005 2:31 pm

Hi Tom,

My 'No' was tongue in cheek.

But it does drive perfectly well.

Perhaps you think I have changed the ratios more than I actually have.
rpm is only reduced by 13% in 5th.

If you have not driven a BX16V with this exact modification, you are welcome to take mine for a spin and try it out. Are you going to the Feb. meeting?

I am not saying that Citroen got it horribly wrong, only that their priorities must have been a bit different. Their car will accelerate a bit faster in 5th. But to me, this is less important than cruising ability on A roads and motorways.

There is no 'hole' between 4th and 5th. The change is perfectly normal.

Top speed may be reduced from 133 to 130mph perhaps, but I never will drive that fast.

You may be surprised by how well it works. I was!

It was only after I had done the mod and driven it, that I was convinced I had done the right thing.
I was afraid of a 'hole' appearing too, so I took a bit of a chance that I would have to swap it all back again.

To overtake you will normally drop to 3rd or 4th gear anyway, because the 5th gear is an overdive.

MPG is improved, I have recorded 42. That was motorway driving at 70ish. Before I would have expected about 38mpg. That surprised me, but typical short journeys will give no saving.

Happy New Year,

Mike

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Post by classic2cv » Fri Dec 30, 2005 4:47 pm

i'll just stick to my turbo D

as it all comes as standard :D
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Post by Mr B » Fri Dec 30, 2005 10:56 pm

I'll be bolting on a TD box onto my N/A shortly, that will really bugger the gearing in 5th, cos I know better than Citroen.

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Post by ken newbold » Fri Dec 30, 2005 11:00 pm

I have a TD box on my MK1 19rd. Fortunately mine was a very quick 19d whereas some are slugish.

I find it much better now, does more mpg and less rpm but if it's your daily drive you will notice the hills a bit more.
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