The TXD Turbot trouncer

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Dollywobbler
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Re: The TXD Turbo rocket

Post by Dollywobbler » Fri Jan 04, 2013 6:43 pm

Yeah, it's hard to throttle back once that boost kicks in. Fun.

If you do a lot of pottering and then boot it, you'll get clouds ahoy. This is just a guess and could be wrong (seeing as I know sod all about fuelling) but my guess is that the fuel supply is set for when the turbo is doing its thing, so when the turbo isn't blowing, it's slightly over-fuelling. That leads to soot and when you do a lot of pottering and then boot it, there's a clag-cloud as the soot gets blown through. As I say, that's my understanding rather than actual fact!

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Re: The TXD Turbo rocket

Post by saintjamesy89 » Fri Jan 04, 2013 7:58 pm

I thought that too, but then I did some reading on the 306 forum on XUD tuning, and apparently there is this thing called boost compensator fuelling, and can be adjusted. It's one of the crews that they recommend you play with along with max fuel and boost. I don't know much about it, or if it works by increasing fueling during boost or the other way around, but apparently if you adjust this screw you can reduce/stop smoking off boost. I keep meaning to read up on how all this turbo, fuelling, pump and other related gumph works.
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Re: The TXD Turbo rocket

Post by Dollywobbler » Fri Jan 04, 2013 8:07 pm

I should look it up really as well, but not now.

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Re: The TXD Turbo rocket

Post by saintjamesy89 » Fri Jan 04, 2013 8:15 pm

If I do end up keeping it, then I think I will want to 'improve' it. Get it more or less sorted so it's reliable, solid etc and then try to reduce turbo lag (bigger exhaust), maybe get a variable geometry turbo and a bigger front mounted intercooler and other things, it just feels like it can give so much more torque, power, black smoke and fun :D
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Re: The TXD Turbo rocket

Post by Dollywobbler » Fri Jan 04, 2013 8:20 pm

I must admit that the lag is a bit of a shock. I drive a lot of minibuses with 'next generation' diesel engines. The turbos on those pull from 1500rpm and are much smoother in their spooling.

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Re: The TXD Turbo rocket

Post by saintjamesy89 » Fri Jan 04, 2013 8:27 pm

Lol, yes, the BX turbo kind of pulls the rug from under you feet when it spools up! I remember reading somewhere that up to a point (say late nineties), smaller turbos were used as they could be utilised better, no longer needing bigger turbos with bigger lags. For example, the HDI that replaced the XUD had a garret T15, smaller than the T2 (and similar) fitted to XUD's. Interstingly, the T15 can give about 115bhp max whereas the T2 can give 130. Read it on a 306 forum, and can't find the bloody link!

Maybe a good way to upgrade a BX TD would be to use two smaller turbos? With a clever exhaust and intercooler systems. That should help with lag :)
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Re: The TXD Turbo rocket

Post by Dollywobbler » Fri Jan 04, 2013 9:22 pm

All adds complication and how would you fit it all in? It did my head in for a bit, but you learn where the power is and how to keep it on boost.

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Re: The TXD Turbo rocket

Post by Birotor » Fri Jan 04, 2013 9:39 pm

If you really want to experience turbo lag try taking a 350 HP 3.3 litre Group B Porsche round Spa at race speeds and I doubt if any of you have....,.!
The answer is you apply the BRAKE as you press the accelerator and once on boost gently ease off the brake. Not suggested for amateurs or on public roads until you have got it weighed off.
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Previously owned include 1983 BX14RE Leader, Porsche 924, 1972 Porsche 911T, 1973 Porsche Carrera RS 2.7 (FIA Group 4), 1974 Porsche Carrera RS 3.0 (FIA Group 4 ex Le Mans), 1969 911 T/R (FIA Group 3 ex Le Mans), 1981 Porsche Group B 3.3 litre World Endurance Championship, 1991 Footwork Arrows Porsche Formula 1 (ex Alboreto & Caffi),

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Re: The TXD Turbo rocket

Post by Dollywobbler » Fri Jan 04, 2013 10:29 pm

400bhp in a Lola T70 replica on the road was scary enough for me. Glad that didn't have a turbo...

The rally drivers of the Group B monsters were big on left-foot braking, because they needed to keep the throttle down to keep the turbo spooled up. By contrast, I read about someone demonstrating a tweaked Land Rover Defender using a similar technique! I do tend to try not to fully close the throttle when approaching a bend. Not too difficult around here as gravity means you don't have to actually brake. You do end up stirring the cogs more, which is why a NA diesel is so relaxing by comparison as it has a very flat torque curve (ie not very much across the rev range!).

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Re: The TXD Turbo rocket

Post by saintjamesy89 » Tue Jan 08, 2013 9:14 pm

Darn car has used a litre of LHM since Friday. I've been trying to book it into the local hydraulic mechanic since before christmas but he was closed from then until Monday, and I can't give it to him until Friday night as i'll need it for work this week. Might be able to borrow my stepdads 306 n/a estate but will ring the garage tomorrow to book/enquire about courtesy car.
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Re: The TXD Turbo rocket

Post by Dollywobbler » Tue Jan 08, 2013 10:53 pm

Mine seems to be using a LOT less fluid since I replaced the strut returns. Still need to stop the FDV drip though...

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saintjamesy89
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Re: The TXD Turbo rocket

Post by saintjamesy89 » Wed Jan 09, 2013 7:38 am

I haven't really had a chance to look at it, one leak may be a strut return as it's in that area. Also the FDV must leak or be worn etc, as the back end of the car will be on it's bump stops roughly 2 hours after parking up. Still, a litre in 4 days, 2 of which it wasn't driven, is an excessive leak in my book. LHM is more expensive than diesel.
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Re: The TXD Turbo rocket

Post by Dollywobbler » Wed Jan 09, 2013 9:15 am

Yup. That sounds pretty bad. Mine needed a litre a month according to the previous owner, but I haven't had to top it up at all since doing those strut returns. Leak could be anywhere though!

Back end of the TXD drops pretty swiftly - within minutes sometimes. Green Tiger can stay level for hours.

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Re: The TXD Turbo rocket

Post by saintjamesy89 » Wed Jan 09, 2013 5:59 pm

More delightful news... The electrics on this car are quite unique. I was investigating the headlamp wiring today at lunch as, when I need to go somewhere and it's dark I need my lights on, but get the irritating one on full beam and the other insipid with interesting dash dispalys, sidelights and full beam was what it wasa telling me this morning... Worked out that every time that happens if I wiggle the wiring that goes from the headlight unit to a union plug/mini loom below the drivers side headlight it works! Also must have brushed the little sensor/plug thing on that side of the radiator as when I started her up to go home the stop light was on, and the radiator light too. Wiggled that, all fine...
Another issue, I have no fan blower as of this evening, started her up to go home and nothing. Which is incredibly helpful toonight as there are no clouds and it'll be a frost, which will not have thawed by half 7 tomorrow. I'll have to see if I can have a look at the blower fan switch thingy on the weekend, or if I can find a torch, one evening.
Another, not so serious, but equally irritating issue, the door shut sensors are dirty/damaged/jammed as when you gently wiggle/rotate the plunger the lights come on, but press it in and let go = no lights. I'll look at that at some point too.

Seem to be amalgamating an awful lot of little niggles. Mostly electrical ones, the rear light wiring (where the tow bar electrics are taken from) still crackles like radio interference, unless you have the heater fan on full speed and the headlights on that is, any further load and it'll crackle same for less electrical load. The really irritating bit are when you indicate or have the wipers on, then it's rhythmical crackling - akin to chinese water torture...
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saintjamesy89
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Re: The TXD Turbo rocket

Post by saintjamesy89 » Thu Jan 10, 2013 7:08 pm

It's redeemed itself today, blower fan is now mysteriously working again!? Haven't touched anything. Still, i'll look at it at some point. Perhaps this auto-fix was because I booked it into the nice hydraulics specialist man in town on Monday :) He's also going to look at the clonk in the front suspension and the grinding bearing noise.

From my description of the leak, he has told me it's almost certainly a split in the height corrector return pipe, that is connected to the octopus somehow, he certainly knew what he was on about! I suppose he should be, being a specialist and all. I get to borrow my stepdads 306 1.9 n/a for the week :) I'm sure i'll miss the turbo, but it'll be interesting how it compares.

Can't wait to have a non-leaking, quiet and smoother TXD! Then I might be more inclined to do niggles like rev counter and glowplugs.
I'm not a Saint, or a James, but a Tom Saint-James!

Mes voitures:
1985 Citroen BX19 GT
1988 Volvo 740 2.0 GL Hearse
2002 NIssan Micra 1.0 S CVT
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