Am I the stupid one here, or is he??
Thread Starter
Registered User
Joined: Aug 2005
Posts: 146
From: Downingtown, Pennsylvania
Am I the stupid one here, or is he??
On ********, I had made a post about what the exhaust that I'm getting sounds like, and this guy is arguing with me that a 3" exhaust is better for an N/A ka24e then 2.5". He said this:
"No, it isn't anywhere near too big for NA. It's been dyno proven that
a 3" exhaust gains from 13-15whp on a nearly stock naturally aspirated
KA24DE, whereas a 2.5" exhaust on a KA24DE with the same other mods
gains only 7.5whp.
You are wrong, and backpressure is not a good thing."
I had said that 2.5" is deffinitly enough and that 3" is just too much, I'm just confused here now. Am I wrong or is he?
"No, it isn't anywhere near too big for NA. It's been dyno proven that
a 3" exhaust gains from 13-15whp on a nearly stock naturally aspirated
KA24DE, whereas a 2.5" exhaust on a KA24DE with the same other mods
gains only 7.5whp.
You are wrong, and backpressure is not a good thing."
I had said that 2.5" is deffinitly enough and that 3" is just too much, I'm just confused here now. Am I wrong or is he?
either works fine, not that big of a difference. i have dual 2.75" pipes on my apexi, tq and butt hp are definently stronger in lower and higher rpm's. i would go with a 3" personally, usually will sound deeper too.
Contributing Member
Joined: May 2005
Posts: 1,634
From: Hershey, PA
Let me guess the guy debating with you must of been (Insanity Inc)......
It sounds like something he would say.....
I would pay no attention to him, he has no dyno charts of his own.....LOL I also argue with him every other week, so who cares......
There is not enough room in the power band to make 14WHP with exhaust alone. Under the SAE NET the KA engine produces 155 HP, this rating is given through power from the ecu and all applicable bolt on's.
There was a dyno a few years back in fresh alloy where supposedly this bone stock s13 with only a apexi N1 exhaust made 14WHP. Technically that is not correct info. The ecu was throwing codes, It needed a new thermostat, (who knows what kind of errors the engine will have during OPEN loop as well), plus the engine was dead cold!!!!!
That is just a way of manipulating HP numbers, and I don't find 14HP believable, that means against all odds without the 15% degredation that the 240sx makes with the drive train, the exhaust alone it made 19HP at the crank without any other modifications.The catylitic converter holds back soooo much pressure that flow wouldn't even move fast enough through the 3"exhaust to even matter if it was 3" or not......
Don't listen to most of the crap you hear.
2.5" is fine and will help maintain a healthy power band....
It sounds like something he would say.....
I would pay no attention to him, he has no dyno charts of his own.....LOL I also argue with him every other week, so who cares......
There is not enough room in the power band to make 14WHP with exhaust alone. Under the SAE NET the KA engine produces 155 HP, this rating is given through power from the ecu and all applicable bolt on's.
There was a dyno a few years back in fresh alloy where supposedly this bone stock s13 with only a apexi N1 exhaust made 14WHP. Technically that is not correct info. The ecu was throwing codes, It needed a new thermostat, (who knows what kind of errors the engine will have during OPEN loop as well), plus the engine was dead cold!!!!!
That is just a way of manipulating HP numbers, and I don't find 14HP believable, that means against all odds without the 15% degredation that the 240sx makes with the drive train, the exhaust alone it made 19HP at the crank without any other modifications.The catylitic converter holds back soooo much pressure that flow wouldn't even move fast enough through the 3"exhaust to even matter if it was 3" or not......
Don't listen to most of the crap you hear.
2.5" is fine and will help maintain a healthy power band....
Thread Starter
Registered User
Joined: Aug 2005
Posts: 146
From: Downingtown, Pennsylvania
Originally posted by BigVinnie
Let me guess the guy debating with you must of been (Insanity Inc)......
It sounds like something he would say.....
I would pay no attention to him, he has no dyno charts of his own.....LOL I also argue with him every other week, so who cares......
There is not enough room in the power band to make 14WHP with exhaust alone. Under the SAE NET the KA engine produces 155 HP, this rating is given through power from the ecu and all applicable bolt on's.
There was a dyno a few years back in fresh alloy where supposedly this bone stock s13 with only a apexi N1 exhaust made 14WHP. Technically that is not correct info. The ecu was throwing codes, It needed a new thermostat, (who knows what kind of errors the engine will have during OPEN loop as well), plus the engine was dead cold!!!!!
That is just a way of manipulating HP numbers, and I don't find 14HP believable, that means against all odds without the 15% degredation that the 240sx makes with the drive train, the exhaust alone it made 19HP at the crank without any other modifications.The catylitic converter holds back soooo much pressure that flow wouldn't even move fast enough through the 3"exhaust to even matter if it was 3" or not......
Don't listen to most of the crap you hear.
2.5" is fine and will help maintain a healthy power band....
Let me guess the guy debating with you must of been (Insanity Inc)......
It sounds like something he would say.....
I would pay no attention to him, he has no dyno charts of his own.....LOL I also argue with him every other week, so who cares......
There is not enough room in the power band to make 14WHP with exhaust alone. Under the SAE NET the KA engine produces 155 HP, this rating is given through power from the ecu and all applicable bolt on's.
There was a dyno a few years back in fresh alloy where supposedly this bone stock s13 with only a apexi N1 exhaust made 14WHP. Technically that is not correct info. The ecu was throwing codes, It needed a new thermostat, (who knows what kind of errors the engine will have during OPEN loop as well), plus the engine was dead cold!!!!!
That is just a way of manipulating HP numbers, and I don't find 14HP believable, that means against all odds without the 15% degredation that the 240sx makes with the drive train, the exhaust alone it made 19HP at the crank without any other modifications.The catylitic converter holds back soooo much pressure that flow wouldn't even move fast enough through the 3"exhaust to even matter if it was 3" or not......
Don't listen to most of the crap you hear.
2.5" is fine and will help maintain a healthy power band....
lol
Contributing Member
Joined: Oct 2004
Posts: 609
From: Idaho
There's a dyno chart somewhere, too lazy to find it but I will later, that had stock number, then numbers after a 3" apexi n1 or similar was installed.. and there was a 12hp peak gain I believe, and no losses at all, in TQ or HP. ..
Originally posted by lrb_2000
There's a dyno chart somewhere, too lazy to find it but I will later, that had stock number, then numbers after a 3" apexi n1 or similar was installed.. and there was a 12hp peak gain I believe, and no losses at all, in TQ or HP. ..
There's a dyno chart somewhere, too lazy to find it but I will later, that had stock number, then numbers after a 3" apexi n1 or similar was installed.. and there was a 12hp peak gain I believe, and no losses at all, in TQ or HP. ..
Can a 3" make just as much top end power if not more than a 2.5"? Yes, but if you were going to compare the differences in all reality a 3" would only probably produce 1 additional HP over a 2.5" in top end power. The reduction of back pressure wouldn't matter so torque numbers would relatively stay the same (due to the catylitic converter). 3" is just to freakin loud for streetable conditions. If you do infact run an exhaust system without a catalytic, then you run into scavaging issues which will decrease HP and lose torque in the low end, and eventually decrease fuel.
Originally posted by BigVinnie
There was a dyno a few years back in fresh alloy where supposedly this bone stock s13 with only a apexi N1 exhaust made 14WHP. Technically that is not correct info. The ecu was throwing codes, It needed a new thermostat, (who knows what kind of errors the engine will have during OPEN loop as well), plus the engine was dead cold!!!!!
That is just a way of manipulating HP numbers, and I don't find 14HP believable, that means against all odds without the 15% degredation that the 240sx makes with the drive train, the exhaust alone it made 19HP at the crank without any other modifications.
There was a dyno a few years back in fresh alloy where supposedly this bone stock s13 with only a apexi N1 exhaust made 14WHP. Technically that is not correct info. The ecu was throwing codes, It needed a new thermostat, (who knows what kind of errors the engine will have during OPEN loop as well), plus the engine was dead cold!!!!!
That is just a way of manipulating HP numbers, and I don't find 14HP believable, that means against all odds without the 15% degredation that the 240sx makes with the drive train, the exhaust alone it made 19HP at the crank without any other modifications.