Intakes less response???
LA G Club
Joined: Nov 2007
Posts: 2,233
Likes: 0
From: L.A. Cali
Guys, today I gave he car a good run. I must say something funny happened, the car actually responded a lot better today
I don't know if the ECU finally adapted it self to the increase in the air flow or was it the weather conditions. In manual mode the shifting was actually better, smoother and more torque, from second to third it actually kick pretty hard. In DS mode the car responded very aggressive in up-shift, but also in down-shift specially into second. This part is not so pleasant since the down shift is hard and it is felt, but I guess that is expected. In normal D, it depends on how you play with the gas pedal, it has to be in the right position for the car to take of aggressively. The down side is that once the car is rolling, the car seems to get very docile and to get the car to down shift, you might have to pretty much floor it, for the G to recognize that you want the lower gear.
But to avoid this, the car has the other two modes right. I'll keep testing the car some more and see what else I notice.
I don't know if the ECU finally adapted it self to the increase in the air flow or was it the weather conditions. In manual mode the shifting was actually better, smoother and more torque, from second to third it actually kick pretty hard. In DS mode the car responded very aggressive in up-shift, but also in down-shift specially into second. This part is not so pleasant since the down shift is hard and it is felt, but I guess that is expected. In normal D, it depends on how you play with the gas pedal, it has to be in the right position for the car to take of aggressively. The down side is that once the car is rolling, the car seems to get very docile and to get the car to down shift, you might have to pretty much floor it, for the G to recognize that you want the lower gear. But to avoid this, the car has the other two modes right. I'll keep testing the car some more and see what else I notice.yeah definitly good to hear because I'm real close to pulling the trigger on these
Very good to hear. Same exact thing happened to me when I had the Fujitas, JWT, Stillen 3G and now the Injen CAI. First day or two, it was really sluggish, I found myself mashing the pedal to push the car. But after a couple of days, damn it pulls nicely. Especially in higher RPMs, WOW!
Registered User
Joined: Dec 2008
Posts: 344
Likes: 2
From: the Big KY
[quote=SilverRSXJezus;2622089]When the o2 sensor is running on open loop (wide open throttle) the ecu will be using preset fuel maps, so you will have more air coming in for a fixed amount of fuel.
Not in MAF systems. That statement would be true if these cars were speed density based, but thats one of the reason engineers moved from s.d. formula. The loss in power is due to the loss of acoustic resonance tuning. When you change the length or diamater you change the dynamics of the acoustic response in the intake tracts. The same is true on the other side of the cylinder. When you change exhausts you change the acoustic response and therefore can see losses due to increased "pumping loss"..ie. the cylinders abiliy to fully scavenge all of the exhaust gases during the exhaust cycle.
Not in MAF systems. That statement would be true if these cars were speed density based, but thats one of the reason engineers moved from s.d. formula. The loss in power is due to the loss of acoustic resonance tuning. When you change the length or diamater you change the dynamics of the acoustic response in the intake tracts. The same is true on the other side of the cylinder. When you change exhausts you change the acoustic response and therefore can see losses due to increased "pumping loss"..ie. the cylinders abiliy to fully scavenge all of the exhaust gases during the exhaust cycle.
Registered User
Joined: Dec 2008
Posts: 1,264
Likes: 4
From: Knoxville, TN
Registered User
Joined: Jul 2005
Posts: 525
Likes: 0
[QUOTE=G_Thang;2624717]
It depends on the MAF system. The hot wire MAF does respond to changes in air density...I am not sure what the G37 uses, though.
When the o2 sensor is running on open loop (wide open throttle) the ecu will be using preset fuel maps, so you will have more air coming in for a fixed amount of fuel.
Not in MAF systems. That statement would be true if these cars were speed density based, but thats one of the reason engineers moved from s.d. formula. The loss in power is due to the loss of acoustic resonance tuning. When you change the length or diamater you change the dynamics of the acoustic response in the intake tracts. The same is true on the other side of the cylinder. When you change exhausts you change the acoustic response and therefore can see losses due to increased "pumping loss"..ie. the cylinders abiliy to fully scavenge all of the exhaust gases during the exhaust cycle.
Not in MAF systems. That statement would be true if these cars were speed density based, but thats one of the reason engineers moved from s.d. formula. The loss in power is due to the loss of acoustic resonance tuning. When you change the length or diamater you change the dynamics of the acoustic response in the intake tracts. The same is true on the other side of the cylinder. When you change exhausts you change the acoustic response and therefore can see losses due to increased "pumping loss"..ie. the cylinders abiliy to fully scavenge all of the exhaust gases during the exhaust cycle.
It depends on the MAF system. The hot wire MAF does respond to changes in air density...I am not sure what the G37 uses, though.
Registered User
Joined: Dec 2008
Posts: 1,264
Likes: 4
From: Knoxville, TN
I'll do my best bro definitely. Got family coming to visit this weekend, but Sunday afternoon is gonna definitely be "car time". I'll probably do before/after vid of OEM vs. Injen SRI to see if there's a sound difference, also an in-cabin comparison.
LA G Club
Joined: Nov 2007
Posts: 2,233
Likes: 0
From: L.A. Cali
thanks
and post your honest opinion about them
if they really do make a difference when driving etc.......
Sorry to thread jack: I keep reading about "Pulling the trigger" and all I can think about is how in college that meant sticking your finger down your throat to puke and rally..
carry on..
carry on..
LA G Club
Joined: Nov 2007
Posts: 2,233
Likes: 0
From: L.A. Cali
hey since your in L.A. check out the upcoming events page
I'm trying to set up a Sunset Blvd meet
so check it out
ok back to the subject
Registered User
Joined: Dec 2008
Posts: 1,264
Likes: 4
From: Knoxville, TN
LOL! That was completely random. Haven't heard it called "pulling the trigger", but I have heard "puke & rally". Thankfully my drinking days are pretty much behind me. I work too much now to be hungover.
Registered User
Joined: Dec 2008
Posts: 1,264
Likes: 4
From: Knoxville, TN
Update: UPS guy just delivered my Injens!!! Everything looks great in the box. DAMN the air filters are huge! This is gonna be a fun install job. Thanks to Lou over at Amp'd for the great deal. Install planned for the weekend.