Why am I losing power???
Thread Starter
Driver School Candidate
Joined: Apr 2007
Posts: 45
Likes: 0
From: TX
Why am I losing power???
Lexus IS250/IS250-AWD /IS350: 2006 IS350
Which Exhaust: HKS Hi-Power
Dyno: Stock 260.0 HP/232.1 ft-lbs
w/K&N Typhoon 261.1 HP/239.0 ft-lbs (gained 7hp in the midrange)
w/K&N Typhoon and HKS Hi-Power 247.9 HP/220.4 ft-lbs (loss 13 HP/19 ft-lbs)
Did you feel any Hp/Tq difference, if yes, how much/where in the powerband, ect? Yes...I'm pissed off my car got slower!
Comments on your exhaust: I picked HKS Hi-Power because i like the look and the sound. But i am very disappointed in the performance of my exhaust. The combination of intake and exhaust sound really good but i can really feel the loss of torque from 2-5k rpms. I added all the upgrades the same day (saturday) so it cant be the temp or weather that caused the loss.
Which Exhaust: HKS Hi-Power
Dyno: Stock 260.0 HP/232.1 ft-lbs
w/K&N Typhoon 261.1 HP/239.0 ft-lbs (gained 7hp in the midrange)
w/K&N Typhoon and HKS Hi-Power 247.9 HP/220.4 ft-lbs (loss 13 HP/19 ft-lbs)
Did you feel any Hp/Tq difference, if yes, how much/where in the powerband, ect? Yes...I'm pissed off my car got slower!
Comments on your exhaust: I picked HKS Hi-Power because i like the look and the sound. But i am very disappointed in the performance of my exhaust. The combination of intake and exhaust sound really good but i can really feel the loss of torque from 2-5k rpms. I added all the upgrades the same day (saturday) so it cant be the temp or weather that caused the loss.
Last edited by javyLSU; Jul 16, 2007 at 05:34 PM.
Lexus IS250/IS250-AWD /IS350: 2006 IS350
Which Exhaust: HKS Hi-Power
Dyno: Stock 260.0 HP/232.1 ft-lbs
w/K&N Typhoon 261.1 HP/239.0 ft-lbs (gained 7hp in the midrange)
w/K&N Typhoon and HKS Hi-Power 247.9 HP/220.4 ft-lbs (loss 13 HP/19 ft-lbs)
Did you feel any Hp/Tq difference, if yes, how much/where in the powerband, ect? Yes...I'm pissed off my car got slower!
Comments on your exhaust: I picked HKS Hi-Power because i like the look and the sound. But i am very disappointed in the performance of my exhaust. The combination of intake and exhaust sound really good but i can really feel the loss of torque from 2-5k rpms. I added all the upgrades the same day (saturday) so it cant be the temp or weather that caused the loss.
I know this post isnt for all this so i'll start a new post to get some help on this.
Which Exhaust: HKS Hi-Power
Dyno: Stock 260.0 HP/232.1 ft-lbs
w/K&N Typhoon 261.1 HP/239.0 ft-lbs (gained 7hp in the midrange)
w/K&N Typhoon and HKS Hi-Power 247.9 HP/220.4 ft-lbs (loss 13 HP/19 ft-lbs)
Did you feel any Hp/Tq difference, if yes, how much/where in the powerband, ect? Yes...I'm pissed off my car got slower!
Comments on your exhaust: I picked HKS Hi-Power because i like the look and the sound. But i am very disappointed in the performance of my exhaust. The combination of intake and exhaust sound really good but i can really feel the loss of torque from 2-5k rpms. I added all the upgrades the same day (saturday) so it cant be the temp or weather that caused the loss.
I know this post isnt for all this so i'll start a new post to get some help on this.
Thread Starter
Driver School Candidate
Joined: Apr 2007
Posts: 45
Likes: 0
From: TX
All things the same....on the dyno...hood open and fans blowing directly on intake. we did a baseline with no upgrades, then we added the intake and made power (7hp in the mid and 9 ft-lbs on the top)....then pulled the carr off the dyno to install the exhaust....30 minutes later back on the dyno and lost major power. We even added an extra fan because we could believe it was losing that much power.
All things the same....on the dyno...hood open and fans blowing directly on intake. we did a baseline with no upgrades, then we added the intake and made power (7hp in the mid and 9 ft-lbs on the top)....then pulled the carr off the dyno to install the exhaust....30 minutes later back on the dyno and lost major power. We even added an extra fan because we could believe it was losing that much power.
Thread Starter
Driver School Candidate
Joined: Apr 2007
Posts: 45
Likes: 0
From: TX
gernby, i saw how fast u ran and that helped me decide on HKS (besides the look and sound). i agree that it should not be losing 12hp and 19 ft-lbs and thats why i was so disappointed. although with my hood down the gain from my intake will be minimized, on the dyno all factors were the same.
caymandive, both the dyno and the seat of my pants say i lost power. i really feel the loss in the mid range and throttle response is less.
one thing we did not do is reset the ECU....do u think i should reset and go back to the dyno?
caymandive, both the dyno and the seat of my pants say i lost power. i really feel the loss in the mid range and throttle response is less.
one thing we did not do is reset the ECU....do u think i should reset and go back to the dyno?
Don't reset the ECU. It will adjust its maps on its own if it hasn't already. If you are certain that it is slower, I recommend pulling the exhaust off to verify that there are no obstructions in the pipes and the gaskets are well centered. It should be a super simple job to do yourself if you have some rhino ramps.
Trending Topics
iizzle, you're not using the silencer inserts by any chance, are you?
That would be very disappointing to hear otherwise. I haven't felt much difference one way or another, but I would hate to know that my exhaust could actually be reducing power...
That would be very disappointing to hear otherwise. I haven't felt much difference one way or another, but I would hate to know that my exhaust could actually be reducing power...
Thread Starter
Driver School Candidate
Joined: Apr 2007
Posts: 45
Likes: 0
From: TX
i called HKS to ask about why i lost power. i was told that it could be due to the intake...they say they only tested their exhaust with a stock air box and with the increased air and loss of back-pressure, i could be losing power.
i think that is crazy because if i get more air in and should want to get it out, right?
i will check the installation when i get home but i took it to a very reputable shop here in houston for installation/dyno.
i think that is crazy because if i get more air in and should want to get it out, right?
i will check the installation when i get home but i took it to a very reputable shop here in houston for installation/dyno.
i called HKS to ask about why i lost power. i was told that it could be due to the intake...they say they only tested their exhaust with a stock air box and with the increased air and loss of back-pressure, i could be losing power.
i think that is crazy because if i get more air in and should want to get it out, right?
i will check the installation when i get home but i took it to a very reputable shop here in houston for installation/dyno.
i think that is crazy because if i get more air in and should want to get it out, right?
i will check the installation when i get home but i took it to a very reputable shop here in houston for installation/dyno.
