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Old 03-09-2014, 05:20 PM   #1
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Default Tuning with an INS box.

Hey guys, I haven't raced nitro tourers competitively for quite a while, and i'll be going a race event at the end of this month. The event rules say that I must run an INS box (which is fair enough), but I've never used one before so I just want to know; do I just tune my engine the same way as always, or are there some things I should do differently?

I know it sounds like a dumb question, but I've only ever used the basic "open" air filters.
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Old 03-10-2014, 01:05 AM   #2
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You have to re-tune the engine a tiny bit but there is nothing different to it.
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Old 03-10-2014, 02:07 AM   #3
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Quote:
Originally Posted by Roelof View Post
You have to re-tune the engine a tiny bit but there is nothing different to it.
OK cool thanks.
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Old 03-10-2014, 05:50 PM   #4
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Keep in mind the position of the inlet holes (facing forward/back) on the INS box play a big role
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Old 03-10-2014, 06:06 PM   #5
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Keep in mind the position of the inlet holes (facing forward/back) on the INS box play a big role
When you say facing forward/back, do you mean in relative to the engine or facing forward/back in relative to the chassis?
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Old 03-10-2014, 06:15 PM   #6
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Quote:
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When you say facing forward/back, do you mean in relative to the engine or facing forward/back in relative to the chassis?
More or less he is saying keep note of it. If its open and scooping in air or if its on the backside not scooping air. There are usually two holes near the top and the direction you point them should remain close to the same especially if you are running the box toward a cut out window or opening. Most of the boxes I have seen have the holes not acting as scoops and are facing toward the rear. That's what I do anyway. I haven't noticed too much change if any in the box.
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Old 03-10-2014, 06:28 PM   #7
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Sorry, should of explained it alittle more, but TerribleTY did....

I prefer to run them facing rear wards more, just keeps the dust and stuff out of them. Some prefer to run them facing forward, to get more air "forced" in.
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Old 03-10-2014, 06:32 PM   #8
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Thanks for all the input guys, i'll be having a look at it.
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Old 03-10-2014, 06:35 PM   #9
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I should add that it's an O.S Speed INS box.
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Old 03-13-2014, 10:18 AM   #10
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+1 for rear wards facing holes although I have run both front facing and rear facing and it did effect tune but once re-tuned didn't seem to change the power or drivability of the engine at all.
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Old 03-13-2014, 11:48 AM   #11
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As with real racing cars the air intakes are facing forward I also do face it forward.
The funny thing is that there are no instructions how to face the holes.
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Old 03-13-2014, 04:05 PM   #12
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Spent the whole day fighting tune with an engine and after 4 rounds and final realised we'd positioned the fuel nipple too close to the air filter/INS and the vibration would cut the fuel line
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