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(Post Link) post #1 of 5 Old 03-06-14 Thread Starter
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Any worthwhile cheap mods on 2.4 jtd 10v

As title fellas. Anything worth doing? Drilling airbox? Decatting? Etc. Any restrictors in place like reduced diameter piping in inlet path etc. Induction kit worth any gains? Anyone done a cold air feed to the filter or intercooler? Interested to hear your views.

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Phil.
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Yes Decatting will help. Remapping helps a LOT. EGR / DPF delete is worth it - usually goes hand-in-hand with remap

https://www.alfaowner.com/Forum/alfa-...te-thread.html

Airbox drilling???? Why will this ever help? The box is designed for optimal flow. On some cars there are resonators on the intake to take out some drone that could disturb airflow. There are very few induction mods that help on their own, especially on a turbo car. Putting in effort for cold air intake, only to have the compression heat it up and then intercooler cool it down again seems pointless. A more efficient intercooler can make a difference.
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Thanks for the reply. Surely the colder the air before turbo charging the colder it will get after cooling via the IC. Also the standard air boxes have been designed with the standard power in mind so could they become restrictive as power is increased. Will definitely look at decatting and losing the EGR.
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Quote:
Originally Posted by AlphPhil View Post
Thanks for the reply. Surely the colder the air before turbo charging the colder it will get after cooling via the IC.
What you say is correct, but one thing that comes into the mix is Newton's cooling law:
The rate of heat loss/gain of a body is proportional to the temperature difference between the body and its surroundings.
So if you get colder air in, it will heat up faster, coming closer (but still lower) that the original temp. In the intercooler the opposite happens. If cooler air enters the IC, the cooling will be less and the temp drop will not be as significant.

What I am getting at: If your air intake is 5degC cooler than before, the nett effect is that by the end of the IC the temp will only be 2degC cooler than before (all else equal). If you put effort into making your IC more efficient - you can gain more than 2degC.

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Originally Posted by AlphPhil View Post
Also the standard air boxes have been designed with the standard power in mind so could they become restrictive as power is increased.
Yes you are correct again - Air velocity has to become higher to service more power, but if you are going to punch a random hole in the middle of the airbox, you will create a vortex that will slow the air down. The cylindrical filter is big enough to flow the air needed beyond 300HP. That is why I suggest looking at the intake resonator / pipe / what have you: This guy calls it a downpipe

https://www.alfaowner.com/Forum/tunin...ngly-good.html
or:
https://www.alfaowner.com/Forum/tunin...ds-or-cda.html
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Quote:
Originally Posted by Gertie View Post
What you say is correct, but one thing that comes into the mix is Newton's cooling law:
The rate of heat loss/gain of a body is proportional to the temperature difference between the body and its surroundings.
So if you get colder air in, it will heat up faster, coming closer (but still lower) that the original temp. In the intercooler the opposite happens. If cooler air enters the IC, the cooling will be less and the temp drop will not be as significant.

What I am getting at: If your air intake is 5degC cooler than before, the nett effect is that by the end of the IC the temp will only be 2degC cooler than before (all else equal). If you put effort into making your IC more efficient - you can gain more than 2degC.


Yes you are correct again - Air velocity has to become higher to service more power, but if you are going to punch a random hole in the middle of the airbox, you will create a vortex that will slow the air down. The cylindrical filter is big enough to flow the air needed beyond 300HP. That is why I suggest looking at the intake resonator / pipe / what have you: This guy calls it a downpipe

https://www.alfaowner.com/Forum/tunin...ngly-good.html
or:
https://www.alfaowner.com/Forum/tunin...ds-or-cda.html
Many thanks for the reply and links. Mixed reviews about the Airbox/snorkel mods so definitely something to ponder.
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