- mat_the_cat
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In gear acceleration times?
Such as 50-70mph etc - anyone know how these are done, i.e. do you potter along at 50mph in 5th and then just boot it, or boot it at 45mph and start the clock when you hit 50?
I've been doing a few this morning and wanted to compare them to Citroen's figures and road test results of the time...
I've been doing a few this morning and wanted to compare them to Citroen's figures and road test results of the time...
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Re: In gear acceleration times?
The magazines have electronic timers now but you can do it with a stop watch and someone else driving ( not Vanny and not on your back road)
You hold it at whatever speed you are going from in that gear and then boot it till you reach the appropriate speed and clock it.
Ideally it should be done on a levelish road, like an old airfield.
You hold it at whatever speed you are going from in that gear and then boot it till you reach the appropriate speed and clock it.
Ideally it should be done on a levelish road, like an old airfield.
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
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- mat_the_cat
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Re: In gear acceleration times?
Yeah, that's what I did - this will be obviously a longer time due to turbo lag. Difficult to find a level road around here though. Trouble is 2 people gives extra weight to the car.Philhod wrote:You hold it at whatever speed you are going from in that gear and then boot it till you reach the appropriate speed and clock it.
For what it's worth this is what I got (1 run only)
30-50 (3rd) 3.5 secs
30-50 (4th) 5.5 secs
50-70 (4th) 6.6 secs
50-70 (5th) 7.9 secs
That is still better than some old road test figures I was reading last night, the bizarre thing is the difference between models (all with the same 1769cc TD engine) over the years the BX was produced! I'm assuming it's different weather conditions/production tolerances/amount the engine has been run in etc.
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Re: In gear acceleration times?
there is an iPhone app for this, it 'senses' the gear change with its twin accelerometers.
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Re: In gear acceleration times?
Ooooh, I'll have to see how mine compares to yours (oooo errrr). Mine struggles a bit in 5th TBH
....There he goes, one of God's own prototypes, a high powered mutant of some kind never even considered for mass production......too weird too live.....and too rare to die
- mat_the_cat
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Re: In gear acceleration times?
Don't you have the valver 5th gear?
TBH, having another look at the figures achieved in road tests from the 90s I'm suspicious that I may have been going slightly dowhill or had a tailwind!
30-50 (4th) 7.3 secs
50-70 (5th) 10.4 secs
(Figures for an estate)
I'm expecting mine to be a bit quicker than standard, but I think to be a fairer test it needs to be the average of say 3 runs, or maybe 2 runs in the opposite direction. Wish I'd tried it with the original engine now...
TBH, having another look at the figures achieved in road tests from the 90s I'm suspicious that I may have been going slightly dowhill or had a tailwind!
30-50 (4th) 7.3 secs
50-70 (5th) 10.4 secs
(Figures for an estate)
I'm expecting mine to be a bit quicker than standard, but I think to be a fairer test it needs to be the average of say 3 runs, or maybe 2 runs in the opposite direction. Wish I'd tried it with the original engine now...
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Re: In gear acceleration times?
I did these in the 19n/a about 8 years ago on a flat surface.
I've been looking for them since you first posted
30-50 3rd 3.4
30-50 4th 5.6
50-70 4th 6.1
50-70 5th 8.0
So not all that different really.
I've been looking for them since you first posted
30-50 3rd 3.4
30-50 4th 5.6
50-70 4th 6.1
50-70 5th 8.0
So not all that different really.
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
Now XBX And into HDI.....as well as other ...err.... things.
Now XBX And into HDI.....as well as other ...err.... things.
- mat_the_cat
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Re: In gear acceleration times?
Well, that pissed on my fire! Are you sure that was an N/A? Or were you heading towards a large magnet?
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Re: In gear acceleration times?
No. That was with 2 up for accuracy too. It also only had about 80 thou on it then too. The 19 n/a is much quicker away than the turbo.
It's only once you get a good spin on the turbo that it picks up.
If you drive the 2 back to back round town, it's very obvious. The n/a is much more sprightly.
It's only at speed on the m/way that the turbo has much more in gear punch.
The later multi angled vanes like the one in my Picasso rectify this, although I think my HDI would improve with an I/C.
It's only once you get a good spin on the turbo that it picks up.
If you drive the 2 back to back round town, it's very obvious. The n/a is much more sprightly.
It's only at speed on the m/way that the turbo has much more in gear punch.
The later multi angled vanes like the one in my Picasso rectify this, although I think my HDI would improve with an I/C.
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
Now XBX And into HDI.....as well as other ...err.... things.
Now XBX And into HDI.....as well as other ...err.... things.
- mat_the_cat
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Re: In gear acceleration times?
Those are quick times - looking at a magazine group test from 1989 (that had the BX16v against an Alfa 75 3 litre) it would appear that an BX 1.9 non turbo diesel is faster than both... Are you sure you've got the decimal point in the right place?Philhod wrote: 30-50 3rd 3.4
30-50 4th 5.6
50-70 4th 6.1
50-70 5th 8.0
Alfa = 5.1/7.0/7.1/9.9 seconds
Valver = 4.8/6.9/7.1/10.9 seconds
It also makes a mockery of my figures, as I used to have a 75, and it felt considerably faster than my BX!
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Re: In gear acceleration times?
Well those are what Derek recorded, with me driving. I have his card here in front of me in his writing.
Mine's a 93 TXD, one of the last ones made, if that makes any difference. It even has the GTI dash and interior, like all the last batch.
I'll tell you what. When I have finished the refurb, I'll do it again and you can operate the stopwatch
Mine's a 93 TXD, one of the last ones made, if that makes any difference. It even has the GTI dash and interior, like all the last batch.
I'll tell you what. When I have finished the refurb, I'll do it again and you can operate the stopwatch
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
Now XBX And into HDI.....as well as other ...err.... things.
Now XBX And into HDI.....as well as other ...err.... things.
- mat_the_cat
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Re: In gear acceleration times?
Ahhhh, that could be it 'cos you have 71 bhp rather than the 65 bhp of the early ones.Philhod wrote:Mine's a 93 TXD, one of the last ones made, if that makes any difference.
Cool, but not after I've been making any cocktails...Philhod wrote:I'll do it again and you can operate the stopwatch
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Re: In gear acceleration times?
Err... especially traffic light coloured ones. and it has 72 BHP cheeky
They were same engine as in the xant, with the fuel filter over the thermostat and the longer oval inlet tracts. Oh and it has Pug alloys on it too! wow.
They were same engine as in the xant, with the fuel filter over the thermostat and the longer oval inlet tracts. Oh and it has Pug alloys on it too! wow.
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
Now XBX And into HDI.....as well as other ...err.... things.
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- docchevron132
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Re: In gear acceleration times?
hmm, I've never timed my TD, but would guess it would be a little better than that..mat_the_cat wrote:Yeah, that's what I did - this will be obviously a longer time due to turbo lag. Difficult to find a level road around here though. Trouble is 2 people gives extra weight to the car.Philhod wrote:You hold it at whatever speed you are going from in that gear and then boot it till you reach the appropriate speed and clock it.
For what it's worth this is what I got (1 run only)
30-50 (3rd) 3.5 secs
30-50 (4th) 5.5 secs
50-70 (4th) 6.6 secs
50-70 (5th) 7.9 secs
That is still better than some old road test figures I was reading last night, the bizarre thing is the difference between models (all with the same 1769cc TD engine) over the years the BX was produced! I'm assuming it's different weather conditions/production tolerances/amount the engine has been run in etc.
It is a tad tuned mind, and it's not an estate..
1989 BX 17TD P2 Hybrid
1990 BX 16V It's got big hairy bollocks
1971 BL 350FG ambulance
1993 Dennis Lance 132 It's got mahooosive hairy bollocks!
Euthenasia, because enough's enough already.
1990 BX 16V It's got big hairy bollocks
1971 BL 350FG ambulance
1993 Dennis Lance 132 It's got mahooosive hairy bollocks!
Euthenasia, because enough's enough already.
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Re: In gear acceleration times?
It now has that cylinder head on that you gave me Doc and I've never blasted it since.
It's not got a cam in it that you had a play with by any chance.........
It's not got a cam in it that you had a play with by any chance.........
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
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Re: In gear acceleration times?
No, it's a std Td 5th gear but with a GTi diff - so, longer legs but not as quick. It struggles torque wise to turn the 5th. It's ok, still accelerates ok for the motorway. It could do with the Garrett T15 a la Xantia. A Zafiara has what looks like the right housings.mat_the_cat wrote:Don't you have the valver 5th gear?
The other thing to do is to steal Doc's idea and put the 2.1 block with the BX head/turbo on it. Whilst I like the apparent 'sprintiness' of the 1.7, I drive it and expect it to behave more like it's big diesel. So 2.1 I may as well!
Regarding your times and thinking you had a tail wind etc, you're not comparing like for like are you? You have a Xanty 1.9 TD which has more torque than the 1.7 TD non?
....There he goes, one of God's own prototypes, a high powered mutant of some kind never even considered for mass production......too weird too live.....and too rare to die
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Re: In gear acceleration times?
If you stick the 1.9 head on a 2.1 block, what does the compression ratio rise to?
If it gets much above 25:1, won't it start to affect the swirl chamber inserts?? I mean, they have a tendency to crack with age anyway.
If it gets much above 25:1, won't it start to affect the swirl chamber inserts?? I mean, they have a tendency to crack with age anyway.
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- docchevron132
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Re: In gear acceleration times?
can't say I've worked it out on paper to be precise, but I suspect the difference in compression ratio would be next to fuck all, if anything I'd say it would be just an insignificant amount lower.
Personally if I'm going to the trouble of pulling a head then I'd replace the swirl chambers anuhow since yes they tend to crack a bit when they get older, although I've seen some REALLY fucked up chambers and they never seem to part company with the head.
Personally if I'm going to the trouble of pulling a head then I'd replace the swirl chambers anuhow since yes they tend to crack a bit when they get older, although I've seen some REALLY fucked up chambers and they never seem to part company with the head.
1989 BX 17TD P2 Hybrid
1990 BX 16V It's got big hairy bollocks
1971 BL 350FG ambulance
1993 Dennis Lance 132 It's got mahooosive hairy bollocks!
Euthenasia, because enough's enough already.
1990 BX 16V It's got big hairy bollocks
1971 BL 350FG ambulance
1993 Dennis Lance 132 It's got mahooosive hairy bollocks!
Euthenasia, because enough's enough already.
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Re: In gear acceleration times?
I hadn't thought of C/R issues, but as the head what where the valves seat is effectively flat, wont the C/R remain unchanged?
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Re: In gear acceleration times?
Well yes the head is flat but the pistons have a recess shaped like 2, 2 pence pieces, joined by a square and not much deeper than the coins either.
It's only as I was writing this that I realised Doc is right. If the 2.1's piston has slightly larger recesses, then of course it would drop the CR a bit, not increase it.
Well hush my mouth
It's only as I was writing this that I realised Doc is right. If the 2.1's piston has slightly larger recesses, then of course it would drop the CR a bit, not increase it.
Well hush my mouth
72... AND STILL ROCKIN..........around the world...... NOT in a chair yet
Now XBX And into HDI.....as well as other ...err.... things.
Now XBX And into HDI.....as well as other ...err.... things.