Well, Im really pissed off. I installed 3 days ago K&N typhoon SRI for my 2008 lancer GTS (with previously installed RRM iming box, RRM piggyback and RRM headers) and has it dynoed Today. The result was a noticable power decrease (like over 6 hp). I dont know if I got it installed wrong or what??? Did it every happened to anyone?? what could be wrong??

 

I'm not exactly sure what the issue is but the k&n filters leave a lot to be desired. That said I find it hard to believe you lost power after getting a tune. Unless I am reading your post wrong? But here......

https://www.evolutionm.net/forums/ev...t-results.html

Was it the same dyno? same correction factor? same dyno operator? There could be a lot of variables. Does the car feel the same when driving?

 

Yes it was same dyno...we did 2 runs. The power and torque decreased through whole band at all RPM range. K&N said it would give 6,75 HP increase, for me it was a decrease....

 

did u retune after the install?

 

I would either try another filter or question the tune!!! By that I mean maybe your ecu is dumping more fuel from the new filter flowing more air. Its up to your tuner to lean it back out to get the full benefit of the filter addition. I don't have too much confidence in k&n's claims.

 

I didnt do any retune. I got RRM piggyback...I spoke with them recently and they said that the piggyback I got from them was already pretuned by them for SRI....The filter seems fine....Today I went back to my old K&N dropin filter which gave me much better results (dyno proven) - although its very strange to me...

 

by the way...I drove over 100 miles with SRI before the dyno runs so the ECU should adjust to it by that time

RRM also said recently that without installing SRI I wont get a full benefit from the piggyback and their headers (which gave me only 2,1 HP increase).....therefore Im even more surprised withe this situation

 

I spoke with Rob from RRM Today...he suggests that I should retune the Piggyback by adding more fuel....

How do you connect the Piggyback to the computer however???

 

Good luck with all that. I have no clue. I have an Evo ix and use ecuflash/evoscan so...
Maybe you should get some sort of wideband o2 sensor that you could log air/fuel ratio's to really see whats going on. Like I mentioned before K&N is not the best filter out there. Do yourself a huge favor and check out the link above on the filter shootout. Otherwise I guess just pick the brains of people that use the piggyback you are using to figure it out. My not so educated guess is that the filter really isn't flowing what it claims or that piggyback leaves a lot to be desired. It's hard to use one size fits all tunes and expect repeatable results even if they are the same model car with similar mods. Just read through some of the general tuning threads and that's one thing that will become very apparent. Just my not so educated .02!!

 

WE found with our own dyno testing that the K&N kits, in fact any SRI kit actually lost horsepower, not gained. The additional heat inside the engine bay just meant the vehicle lost horsepower. We did back to back testing on around 5 different brands.

Additionally, simply adding fuel indiscriminantly with a piggy back is just plain wrong. In many cases these vehicles run too rich from the factory, and in fact need fuel taken out, especially if it is sucking in hot air from a SRI system.

We found that a proper cold air kit system, produced consistantly better results. All our tuning also found that removing some fuel, adding small amounts of timing and playing with the camshaft timing produced the overall best results.

 

Thanks. What I did yesterday is created a new fuel map. I added extra fuel and good quite good result. Below are links to dyno and AFR sheet, with base and modified by me map.

As you can see during Test 3 the engine was lacking fuel at the high end and the power dropped seriously. After adding extra fuel the situation has improved very much.

http://s782.photobucket.com/albums/y.../Piggy%20tune/

 

The thing you need to remember, is because you are using a piggy back ecu, you are changing the air flow meter values. When you change htese you not just change fuel, but you change ignition timing as well. Just need ot be careful and check for any ignition knock. When you get knock, the car will run richer and pull timing out

Sounds like you are on the right track though

 

Well the R4 software for piggy has 2 diffrent MAPs. MAP A for fuel curves and MAP B for timings. I dod not make any changes to map B. I think that my current timings are just fine (I got the Timimg Control Box - which makes a good job - increased the engine power by 8 HP)

 

i installed a k&n typhoon into my evo 8mr and it felt a bit weaker also. i had to reset the ecu and that made it better. more importantly what i found was that my fuel trims were now way out on the rich side. i adjusted trims and that seemed to resolve the issue.

the heat shield that comes with it is pretty useless...better than nothing but come on, i would have expected something a bit better from the likes of k&n.

my 2c...

 

the heat shield for new lancer is quite good...it seems a bit better than the one you have

But with these SRI intakes I think that manufacturers should warn peaple that they require ecu remaping. It seems necessary not only for the performance but also for proper engine work...when I checked my AFR after installation at about 5500 RPM it was abt. 18.0:1 what is becoming seriously dengarous for the engine because of the temperatures.