I just installed an RMR intake and grounding kit this morning. After resetting the ECU and going on a test drive, I noticed loss in power. The car did not pull as hard as the stock intake. Has anyone else had this issue? Does the car need more time for the ECU to adjust to the new filter?

 

From what I read here, some intakes will cause the symptoms you are experiencing. It is best that you need to have it tuned since the ecu is compensating for the amount of extra air flow coming in by making the car run rich.

 

My car definately felt slower, and stalling problems. But thats what you get if you want the bad-*** sound of sucking and blow off.

 

Well, just remember that immediately after you reset your ECU, the car is gonna run "funky" as it re-learns its fuel trims.. so don't be too concerned..

About the HP gain.. Well, its a bit subjective since the perception seems to be that the car lost power.. It feels a little soggier down low, and an unrestrictive filter/intake pipe *CAN* cause stalling, but normally it doesnt once the ECU catches on. The reason for the stalling is the lower MAF reading due to lower air velocity at idle.. Its a weird situation..

This has been discussed many times...

The general consensus is that a Filter or a Filter/Intake pipe aren't necessarily the best first mods to do. Most recommend a Panel filter..

Honestly there's not a huge performance gain to be had.. Most of the gains "documented" by the manufacturers of the filters are due to how it affects airflow through the maf sensor (causing the car to run a little leaner)

Even though its a bolton, most feel the stock airbox is adequate for most performance mods. It isn't until you exceed the air capacity of the airbox that an unrestrictive setup should be installed.. You'd have to do a bit more than the basic boltons to get to that point.

Now, the good news is you can get a reflash, or piggyback to tune for these things and also get improvements in performance over the filter.. But I do understand the need to keep things simple, and not affect warranty..

If I had to do it again, the air filter would not have been my first mod.. though after a bit of tuning with my first tuning setup (an S-AFC) it did make things alot better.

 

Thanks everyone for your input. I myself think that this was a mistake for a first mod. So it looks like I will need to get an S-AFC or have my ECU reflashed at some point in order to fix the problem. I plan on leaving it on for the next several days to see how the car responds. If no change, I will reinstall the stock box and wait till I can afford a reflash. However, I don't want to void my warrenty so I may have screwed myself.

 

I'm pretty sure the Vishnu Evo has a stock intake. That car is reported to have around 500bhp, indicating that a properly tuned Evo can generate tremendous horsepower with a stock intake and supporting mods.

Speedlimit...