SPT Power Pack: Fact or Fiction??

Ditto the 225 for an STi. I remember seeing that last year at the weekend dyno event.

I have never heard anybody talk about big power from a CAI. Everyone just loves hearing that intake roar. Like all those stupid K&N ads. :biggrin:

 

Here's the final results. I decided after doing my pulls with the SPT hardware yesterday to go back to stock and do another pull today. ECU was reset last night and the car was putting better numbers down pull after pull today so it seems it didn't have enough time to learn.

Long story short: Looks like in order to see any gains with the SPT intake you need a tune!

 

Send that ish to Subaru/SPT.

 

hooray for sucking in hot engine air!

 

Hood was open with a fan blowing on the front of the car. How's hot engine air going to get to the filter like that? Better yet, how's hot engine air in enough quantity to lose that much power going to get there? I don't think there was a temp increase great enough to cause a 7% drop. Something else was going on as well.

Ron seemed to think that the increase in air flow may have caused the ECU to run a different map with more timing and in doing so caused knock and it retarded timing to fight it. My boost was also coming on a lot slower. That's all speculation though since no logging was done.

 

That probably won't happen.

The OEM ecu map is setup where as load (ie, sucked in air) increases, the timing decreases, assuming that the loads stay within the range of the map.

If intake temps rise above 120*F, the ecu will start to pull timing up to 8% of the base value. However, after thinking about it, I don't think this is the main cause (but it was probably a factor). Looking at the power loss up top makes it look like the package might be a greater restriction than the stock stuff.

 

Do you think maybe it started to add too much timing as it saw the air flow increase, saw knock and started to pull it back? Someone on iwsti or nabisco logged a WOT throttle run (on the street) with the SPT intake and was seeing somewhere around 75GPM more air. I did visually noticed the car almost “hiccup†on one of the runs.