Exhaust System BX TXD

[kiwi]

OK driving home tonight was followed by the rear silencer box

Snapped of cleanly from the pipe. Now the question is beside the not so obvious (its a diesel) sound increase. Would that have a performance impact ? (again its a no turbo diesel).

My thinking is to just extend the pipe to stop the fumagation and settle with just one silencer. Any problems or risk you can think of?

[citsncycles]

There will be a difference, but it's hard to tell if it will be good or bad. The critical length is engine to first silencer, but the rest does make a difference too. I've found that as a general rule of thumb the less bends, silencers or other restrictions the better the flow, although this can be offset by the change in total length, which changes the engine speed where peak power is generated.

As the expense is minimal, I'd stick a length of pipe in and see what happens.

[Tim Leech]

My thinking is to just extend the pipe to stop the fumagation and settle with just one silencer. Any problems or risk you can think of?

Having done this I wouldnt bother, it gets quite loud!

A rear box is very cheap, £20 at the last look, same one as fitted to a BX 16 and 19 non injection petrol too.

I bought a rear box for my ZX from a german outfit that dispatched all over the place, it was still cheaper than buying one locally even with shipping.

[kiwi]

A rear box is very cheap, £20 at the last look, same one as fitted to a BX 16 and 19 non injection petrol too.

Nothing is very cheap here when it comes to parts! You turn up at one of the so called"exhaust specialists" and they either are focused on making the job bigger and selling you a modified super deluxe wide bore or telling you how great such and such exhaust would be on a Subaru.

I have been contemplating removing the 19TRS rear exhaust system and using that instead although it being probably as old is a risk in itself.
The risk is disturbing the anything on the rear of the exhaust will show up the other weak areas.

With one silencer loud you say??? I did not notice being a diesel the tick over sounds louder than whats coming out of the exhaust

Three BXs and each has a fault with it!!!! oh and a holiday weekend so nothing can do until Tuesday either.

[Tim Leech]

Three BXs and each has a fault with it!!!! oh and a holiday weekend so nothing can do until Tuesday either.

Just one?

Lucky you!

http://www.ebay.co.uk/itm/Exhaust-Rear- ... 74cb3#shId

Is it worth asking these people if they will ship to NZ as they do most other places?

[kiwi]

Thanks Tim

Tell you what though I am not looking forward to doing this job myself with just a set of car ramps. Besides the obvious of a twenty year old exhaust system. Theres a weakness on the pipe further down that was welded a few months ago when I got the vehicle so this may end up being a bigger job.

basically its a clean break literally on the joint to the box itself. Removing the section of pipe still in place looks challenging with more corrosion visible.

Dropping the 19TRS system looks more appealing although once thats off thats practically the death nail for that car and that I want to avoid.

[Tim Leech]

Thanks Tim
.

Dropping the 19TRS system looks more appealing although once thats off thats practically the death nail for that car and that I want to avoid.

If the 19TRS is a carb fed one (which I assume it is) its the same system asides the front pipe, so could you not swop it?

[kiwi]

Thanks Tim
.

Dropping the 19TRS system looks more appealing although once thats off thats practically the death nail for that car and that I want to avoid.

If the 19TRS is a carb fed one (which I assume it is) its the same system asides the front pipe, so could you not swop it?

I realise it is the same however I dont want to risk dismantling it and causing somas it looks fragile with rust areas near joints. A good sign if disturbed may break.

On further inspection it looks like I may have to replace the entire rear section (thats what I would do with dropping the 19TRS system). Reason being only one exhaust clamp on that middle sillencer two the two pipes the second (the one to the rear silencer) looks like it has been welded.

[kiwi]

Update

Getting a new exhuast system is an arm and a leg

A local Mechs has loads of bits and pieces and is going to make up a system for me, one snag it wont be until next wednesday at the earliest

Nothing like a bit of car trouble and being told we will do it next week! Yes I know find another garage well this is another garage they are just slack around here

Now I think about it it would have been quicker to order from overseas at least the parts would get here in time to be fitted.

[MULLEY]

Would it not be worth just getting a full stainless steel system fitted instead? It might not be all that much more expensive than getting the standard mild steel version?

[kiwi]

I did think about that mulley but given the lack of corrosive elements i.e. Salt on the roads here it probablt make little differance.


One burning question though about exhaust systems is would fitting random type mufflers make any differance to the performance or more crucially fuel consumption.

Thats something I have been thinking about given the 19TZS has a modified system that has the flow go straight through the first muffler as opposed to the normal pipes in and out of the same side of that first muffler.

Reason I ask is the TZS fuel consumption is heavier than the 19TRS (same engine spec) although someone reckons that the drive belt to the aircon causes that heavier load even when not in use?

Something I want to avoid with the Diesel is losing that economy I got the thing for even if just a few percent loss. Although power gain on the hills would be nice

[Way2go]

I did think about that mulley but given the lack of corrosive elements i.e. Salt on the roads here it probablt make little differance.

Salt in this case is probably not the main cause of failure. A bigger contributor is the acid compounds being formed between the exhaust gases and water vapour as they pass through. Rot in exhaust sytems (despite any surface rust) is usually from the inside out and SS is less susceptable to these acids.

[kiwi]

I did think about that mulley but given the lack of corrosive elements i.e. Salt on the roads here it probablt make little differance.

Salt in this case is probably not the main cause of failure. A bigger contributor is the acid compounds being formed between the exhaust gases and water vapour as they pass through. Rot in exhaust sytems (despite any surface rust) is usually from the inside out and SS is less susceptable to these acids.

Either way the exhaust systems seem to last longer here in my own experiance. Salt was used as one example of corrosive element lacking on the roads here.


Although this detracts from the question regarding performance issues by fitting a none standard system to the BX.

[MULLEY]

Difficult to say tbh, a straight through exhaust should technically offer more performance as there is less in the way if you know what i mean? However, i've heard that all these boxes in the exhaust system are designed to create a certain amount of pressure which means the car has the performance that its supposed to have, & without them it can cause the car to have less power.

The only way to know is by trying both & then see which one you prefer.

[kiwi]

It makes sense what you said. Having the 19TZS and 19TRS to compare which have differant designs on the exhaust system is what made me start thinking about this factor.

The TRS has the original design but the TZS has the effectively straight through design and of the two I find the TRS better on acceleration and fuel consumption. I did put this down to the anomaly of the TZS having inaccurate speedometer and odometer of about 10% less distance than actual and like I said the aircon. Although the TZS also has a skimmed head from its head job that may reduce compression further.

This should be interesting to follow I think once it is done.