Diesel exhaust systems

orca1911

Tuner
Points
57
From
Canada
Car
Peugeot 206 1.6 HDI
An intercooler warms up as it works, the larger it is means it can stay cooler for longer. Add in the extra distance the air has to go, the additional turbulance and you have a need to match intercooler size with requirements for it to stay cool for longer.

Rule of thumb I use is 3 litres of intercooler capacity per 100bhp.

Water or methanol injected on the intercooler can also help to keep it cool and I've seen this done where space was limited for a larger intercooler.

Read our full guide here, if you haven't already.
https://www.torquecars.com/tuning/aftermarket-intercooler.php
Do you have a guide on catalytic converters, types, etc ? I want to find one for a small diesel car but there are only the ones for trucks lol

I’ve no idea on specifics but the standard turbo will have to fill a larger area which may reduce the effects of the boost that reaches the throttle body?..some may argue it could increase turbo lag where some may say you’ll see around a 5-10% increase in power?..I personally wouldn’t upgrade the intercooler without also upgrading the turbo..but I’m no master on the subject...my car made 40BHP more over stock with the remap alone ..the turbo and intercooler upgrade then took that to just over 100BHP above stock..
3l per 100bhp does make sense when you think about it, the only thing that doesnt is the placing of some stock intercoolers, like, almost on top of the engine. One can only imagine how fast it heats up when idling like that.
 

Greg1990

Torque Junkie
Points
292
From
Pontefract
Car
S40 2.0D SE sport
I know what you’re saying..Subaru Impreza intercoolers sit on top of the engine whereas mine sits across the bottom of the bumper in the main stream of cool air...
 

Lunchmoney

The Torque Meister
Points
492
From
Poole, UK
Car
'98 JDM Impreza STI
There's a reason why moving our top mounts (TMIC) to the front (FMIC) is a common mod for Scooby drivers chasing big power. It's a must for 400+bhp.
 

orca1911

Tuner
Points
57
From
Canada
Car
Peugeot 206 1.6 HDI
5 pages later and my lack of knowledge/experience that started this topic is shrinking at least thanks to various input and information on this forum and page.

I've learned that black smoke is just a result of dumping too much fuel into the engine that ends up unburnt in the process, which was my main concern.

Now for the other parts of the exhaust dilemma, how do you fix the emissions issue that come with an upgraded engine? Can you have a better performance with bigger filters that provide better airflow? My aim is to have a street legal car that i can drive anywhere without being fined.
 

Greg1990

Torque Junkie
Points
292
From
Pontefract
Car
S40 2.0D SE sport
Diesels have low emissions as a rule...all the modifications I’ve done has not had a negative impact on emissions..my exhaust has one silencer,no DPF or CAT..With the addition of the methanol kit my emissions have actually improved..
 

Greg1990

Torque Junkie
Points
292
From
Pontefract
Car
S40 2.0D SE sport
I don’t but it flies through what’s called an MOT over here..it’s a test to show your vehicle is safe and fit to be used on the highway...
 
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