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Mid-Box Pipe Removal or Not?


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Gents,

Typical!! Been planning this for ages and now the time has come, I'm not sure.

Ok, situation is thus:

1994 110 300Tdi CSW. Pump's been tweaked, K&N etc.

Booked in with Jon at Brunel for a high-flow intercooler to be fitted on Friday at Billing.

My specialist can weld a straight pipe to replace the mid-box tomorrow after she's had her MOT.

Is this worth it? Not the money, but the reward?

Yes, I've read Western's post countless times and every other post I can find too.

Your comments please.

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Guest diesel_jim

FWIW on my 90 i had a 3" stainless straight through system. was darn noisy.

i swapped it for a standard downpipe, an ex V8 "sports" rimmer 90 silencer and tailpipe (looked almost the same as a standard Tdi pipe)

engine seemed to rev virtually the same as my 3" freeflow system, power was the same, drivability was the same, i just didn;'t get a headache after 3 hours of driving.

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Well my engine only has the small intercooler and the pump optimised by Alli-Sport. I found that it was more drivable.

Then I took that silencer out.

Boy oh boy what a difference.

I can travel in a 30mph limit at 1.100rpm something I couldn't do before. I had to drive in the town in top gear [4th to you I supose] I believe there is a lot more lowdown torque with that silencer removed.

Two MOT's later still no problem

mike

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if the pumps/ecu/intercooler have been tweaked/flashed/upgraded/changed then removing it will give you better performance and mpg!

If the engine is std then the only thing you gain is a headache!

well thats my experience with tdi and td5s anyway

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Cheers guys!!!!

Excellent advice as ever. Mid-box will be out this morning.

If nothing else, I've got a VERY excited 4 year-old son who's been asking when Daddy will make the 110 noisier.

Confidence restored.

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You can remove both the silencer boxes on a turbo motor. The turbo acts as a silencer.

I've heard both a 200Tdi 90 with a Janspeed with no boxes. A 300Tdi 90 with a mild steel systen, no boxes. Both do not sound loud. Certainly not as loud as some of the quieter big bore hot hatches.

mike

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Cheers guys!!!!

Excellent advice as ever. Mid-box will be out this morning.

If nothing else, I've got a VERY excited 4 year-old son who's been asking when Daddy will make the 110 noisier.

Confidence restored.

I fitted one of the Paddocks S/S mid pipes last week (old centre section had rotted through just behind the box).

My engine is untweaked yet It is pulling better than before & no louder.

Definitely worth doing for the price imho.

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I replaced mine with a SS mid section as I smacked my centre box a few times off roading. Bought it off ebay 2nd hand for 25 notes, but when it arrived the previous guy had never fitted it as it was new.

Can't say I noticed any difference performance wise etc on my standard TD5 90.

It drones a bit a motorway speeds but otherwise ok. Extra noise may be down to the fact that my rear pipe exits out of the rear now not the side. Still have small rear box.

Cheers

Steve

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It drones a bit a motorway speeds but otherwise ok. Extra noise may be down to the fact that my rear pipe exits out of the rear now not the side. Still have small rear box.

Cheers

Steve

I'd like to get a side exiting rear section in stainless for mine (300Tdi) does anyone know if there are any suppliers who do these?

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I have the rear box removed from my 110 and replaced with a bit of straight stainless. It certainly felt like the turbo span up quicker when I first did it but the old box was completely shot so theres no surprise there. Whether its better than standard who can say. Doesn't sound noisier just slightly deeper.

Will :)

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fella's, not trying to be smart, but how can removing the main muffler help performance on a 300Tdi when the stock muffler is a straight through perforated tube that is a bigger ID than the exhaust pipe ??

There would be absolutely no back pressure created at all by this.

FWIW, I have a 3" straight through system, dump opened out to 2.5" ID, 15* taper up to 3" to minimise flow separation, no main muffler, just a resonator at the rear and it does spool up better than stock and gears can be held much longer (revs out better) but the differences aren't startling.

I'll be fitting a centre muffler soon as the noise and drone is getting to me on a trip. Without the rear resonator the noise was absolutely painful.

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fella's, not trying to be smart, but how can removing the main muffler help performance on a 300Tdi when the stock muffler is a straight through perforated tube that is a bigger ID than the exhaust pipe ??

There would be absolutely no back pressure created at all by this.

FWIW, I have a 3" straight through system, dump opened out to 2.5" ID, 15* taper up to 3" to minimise flow separation, no main muffler, just a resonator at the rear and it does spool up better than stock and gears can be held much longer (revs out better) but the differences aren't startling.

I'll be fitting a centre muffler soon as the noise and drone is getting to me on a trip. Without the rear resonator the noise was absolutely painful.

Because the gasses go into the silencer and stop the others going down the pipe. In other words the gasses slow them selves down.

mike

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Mornin 110

For what its worth

i have the upgraded interccoler (good stuff too) (my was a fearn conv)

I was recomended to upgrade the exhaust system to 65 mm through-out (this i in the end didnt do)

What i did do was put a std defender 90 system on but onlx the middle box - no back box and ran a tail pipe straght through exiting just right of the rear tow hook with a slight down tilt

main thing i also did was get rid of the cat and put the replacement LR part from the manifold to the firts box - that maks a difference ans in my case the system runs sweeter the turbo is more responsive, Overall there is very little in the way of black smoke under heavier accelaration

all the best

& happy trails

Abe

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Well, it's off now and a Brunel intercooler went in at Billing for good measure.

Noticed no real noise difference on the way to Billing - just a bit more resonance on the overrun / trailing throttle but nothing annoying.

Turbo spool-up time? Mmmm. Not sure as most of the time after box removal and before intercooler was spent with a full-load.

However, now Jon at Brunel has done his stuff, I'm sure the mid box deletion has aided the engine a bit. Loads of pull and the engine spins up a bit quicker.

For the money, and if the engine is being warmed-up, then do it.

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I have done mine a couple of weeks ago.....I have fitted a K&N filter, not yet re-set turbo pressure or fuel pump, or uprated my intercooler, but there is certainly a marked difference! :D

The cockpit noise difference is negligible, pulls like a good 'un and the drive is totally enhanced and just feels 'lighter' underfoot, if you know what I mean?

Would highly recommend it to you!

I had mine done through Powerflow Exhausts (dont know how to do one of those Link things, sorry) in Snor Bans (St Albans!) but they have franchises all over the place. Took all of 20 minutes, and I got change from 50 quid for a 2 inch stainless pipe.

Martin

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