ok guys just bought an ARC topmount today and after a good clean up of inside and out i thought i'd do some testing. and a little disapointed to be honest with you, especially considering the hype everyone gives this thing on the forum. Spec of the car hasn't changed from when i started this thread.
Did a few tests on my bench flow tester that i use for porting cylinder heads. Anyway tested against the stock one. The ARC has a 0.4psi pressure drop more than standard so its more restrictive. and was showing more restriction when i turned the machine up as high as it would go compaired to stock. This was also shown when i did a before and after test of the cores, outside temps the same i would hit 0.9bar solid with the stock IC, 0.88bar solid with the ARC showing a greater pressure drop, ok not labratory accurate but you get the idea.
i couldn't relaly do temperature tests accurately apart from its been about 5 degree's here today and with the old stock one if i booted it 2/3/4th to 100mph my intake temps would peak at 62 degree's using that fast acting sensor. tried it again today and it was flucuation between 4/5 outside temp and i still hit 60 degree doing the same run. Not very accurate i know but you get an idea that there similar in cooling ability. both massivly heat soaked on what is a cold day from only 3 gear pull that lasted what 10-15 seconds maximum. This was done on the move not sat on a dyno so seeing real world conditions. tempersatures were outside 5 degree's both showed 20-21 intake before i started the test
Only real benifit i noticed from this is that it returned to ambiant temps faster after you lift off where the stock would hold onto its temp average 10 seconds longer than the arc before ballancing out at hte same temp.
thought people would find this intersted.
Wish i had a dyno so i could do a back to back power run, but butt dyno says no difference and temperature and flow tests show no difference so i'm going to take an educated guess and say there would be negligable power gains either.
Tim
