Thread: Another open cone vs sealed box debate

Originally Posted by tazyboy28

i thought the whole point of a CAI was to reduce heat which in turn reduces knock . . . and also more airflow of course.

you also arent understanding that colder air creates more knock because the car is running more timing because of the colder air.

Ok, again I've been called ignorant on the other GP website,

Darkrelic post to me is as follows.
"What are your plans for your GTP? do you want a drag racer, street racer/daily driver, or a circuit track car. If you just want a straight line machine you should listen to the guy about the turbo's. There are good choices for turbo charging your car, but you are going to have to do something about that transmission of yours before you are going to make enough power to run out of "stock airbox"

your sucking air through a straw theory does sound nice, but you clearly have a lot to learn about your GTP. The bigger restrictions are in the manifolds and u-bend, and adding additional hot air into the mix makes it worse. Are you scanning for KR yet? If not you really need to stop being so passionate about your ignorance. You are off to a good start, just don't ruin it and piss off the people on this forum trying to help you. The M90 is only an air pump that doesn't compress the air like a twin screw or a turbo, it only forces more air into the engine than the car can take. It's why these cars typically do better with exhaust mods than intake mods. All of the boost you generate is because of Boost stacking. If you want to add hot air on top of the +200 the supercharger is already producing above ambient then be my guest.... but if you want to drop pulleys remember to go 0.1-0.2" larger than the rule of thumb.

I have scans using my autotap showing runs in the same day ~2hours apart. They aren't dyno runs, or anything to use as bench tested data, but it is data logged from before and after for my hot air intake and with the stock 99+ airbox with a K&N Panel Filter, and then another log on a different day with the custom wizaired cloned airbox on. (I used different insulating materials then they do). It was also done with a tuned 3.4" pulley and SLP ceramic headers/full exhaust.

-My Peak flow from the MAF was ~35.6lbs/min of air at 5751rpm's (2nd gear) with the stock airbox on 3 pulls in a row only deviating +/- .2lb/min .
-My peak flow from the MAF was 36.971lbs/min of air at 5772rpm's (2nd gear) With the hot air intake on the first pull, then 36.412lbs the second pull, and 36.361lbs the third pull same stretch of road and everything.
-My peak flow from the MAF was 37.786lbs/min of air at 5747rpms (2nd gear again) with the airbox over the same piping/filter as the HAI, then 37.392lbs/min second pull, and 37.411 lbs/min the final run. (the larger amounts of air with the airbox are most likely because this was in the morning on a slightly colder day)

What was interesting was what my KR and IAT showed me...
the HAI IAT showed 26+F before the runs, jumped up to 42*F and got back down to 28* before shifting to 3rd and hanging steady at 26*F at over 100mph, the second run got even hotter to 45*F before cooling back down to 27*F before shifting to 3rd. KR peaked at 8* at one point (1st and second gear both, 3rd gear KR was like the others with less than 2*KR). (ZZP's tune runs my car excessively rich, I was 9.9:1 AFR with all 3 tests and my LTFT's locked in at 0)
The CAI IAT showed 18*F before the runs and didn't get above 22*F with <2*KR it was very consistent and would make it much easier to tune.
The stock airbox IAT showed 26*F before the first run and did heat up to 28*F by the third run with KR similar to the CAI airbox setup. (<2*KR)

I originally thought the same way you did before I ran my own tests. The stock airbox is restrictive, but there's a reason we are telling you to put a box on it. Granted I don't have a scan of a Hot air intake on a hot day...... but I may just do that this summer to see how bad it is, another before and after the box comparison. I'll go worse case scenario in August I think. It gets pretty humid and hot then. For every 1*KR you have, you typically lose 2-3hp.... so for me to increase 6*KR that means I'm losing potentially 12-18 mid-range HP by running a HAI. I know, another rule of thumb, but it is something that has been dyno proven again and again."



Here's a pic they posted showing me what they said a HAI caused, I highly doubt it was just an intake