DIY header install for GS300 *WITH PICS*
05-23-11, 05:58 AM
#107
And we probably won't get a straight answer, at least one that isn't disputed, for quite some time. Most people that install headers have a CAI, after market exhaust, after market y-pipes, etc. My point is headers are a great foundation for a NA build and most people can't accurately gage gains or are not willing to dyno after just a header install.
05-23-11, 07:46 AM
#108
If every 2JGE car was to be dynoed before and after header installation there would be just as many different numbers just like how every 2JGE motor has different hp/torque numbers when stock. What was the ambient temperature, what weight and type of oil was being run at the time, what type of trans fluid was being run, what drag did the accessories have on the motor, how well was the motor broken in....these are just some of the variables.
The performance increase offered by just a header installed could be accomplished by removing all the extra stuff in the car (spare tire, tools, passenger seat, etc) and aside from the labor involved is "free". Does that make it worthwhile?
Point blank: almost every performance mod done to a car will have different results on every car it is done to. Not every mod will increase the hp/tq numbers but may increase drivability and/or mileage. On the flip side, many mods increase the hp/torque but hurt drivability or mileage. "Do this mod and you'll increase peak hp by 15 but the car will be much slower off of the line because of the weight increase" <-just as an example.
Regarding the header swap on my GS300:
1) better drivability
2) increase in mileage
3) easy instal
4) inexpensive
5) slightly better performance
05-23-11, 11:24 AM
#109
It is also funny the obsession with numbers, horsepower and torque. As many have stated, there is an increase in both as determined by different methods. There is an increase in drivability as well as mileage. The instal is easy and the price is not terribly high. At what "magic number" does the modification become worthwhile?
If every 2JGE car was to be dynoed before and after header installation there would be just as many different numbers just like how every 2JGE motor has different hp/torque numbers when stock. What was the ambient temperature, what weight and type of oil was being run at the time, what type of trans fluid was being run, what drag did the accessories have on the motor, how well was the motor broken in....these are just some of the variables.
The performance increase offered by just a header installed could be accomplished by removing all the extra stuff in the car (spare tire, tools, passenger seat, etc) and aside from the labor involved is "free". Does that make it worthwhile?
Point blank: almost every performance mod done to a car will have different results on every car it is done to. Not every mod will increase the hp/tq numbers but may increase drivability and/or mileage. On the flip side, many mods increase the hp/torque but hurt drivability or mileage. "Do this mod and you'll increase peak hp by 15 but the car will be much slower off of the line because of the weight increase" <-just as an example.
Regarding the header swap on my GS300:
1) better drivability
2) increase in mileage
3) easy instal
4) inexpensive
5) slightly better performance
If every 2JGE car was to be dynoed before and after header installation there would be just as many different numbers just like how every 2JGE motor has different hp/torque numbers when stock. What was the ambient temperature, what weight and type of oil was being run at the time, what type of trans fluid was being run, what drag did the accessories have on the motor, how well was the motor broken in....these are just some of the variables.
The performance increase offered by just a header installed could be accomplished by removing all the extra stuff in the car (spare tire, tools, passenger seat, etc) and aside from the labor involved is "free". Does that make it worthwhile?
Point blank: almost every performance mod done to a car will have different results on every car it is done to. Not every mod will increase the hp/tq numbers but may increase drivability and/or mileage. On the flip side, many mods increase the hp/torque but hurt drivability or mileage. "Do this mod and you'll increase peak hp by 15 but the car will be much slower off of the line because of the weight increase" <-just as an example.
Regarding the header swap on my GS300:
1) better drivability
2) increase in mileage
3) easy instal
4) inexpensive
5) slightly better performance
07-31-11, 03:19 PM
#114
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I did dyno my gs , after and and before . I had 11 hp and 5 tq gained with just the headers the srt intake gave another 13 hp and 14 tq by also replaceing the stok mufflers with some aftermarket ones it also gave me some power Not alot. I have some sound clip
http://youtu.be/BXPxUbHE13A
http://youtu.be/BXPxUbHE13A
Last edited by kxm2239; 07-31-11 at 04:10 PM.
12-06-11, 04:01 PM
#117
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I'm surprised no one here has mentioned using a spark plug non-fouler for the O2 sensors. I used them for my SRT-4 neon and my Evolution when I replaced the catalytic converter. Neither car threw a CEL, and it seems a lot simpler than having to wire stuff into the ECU. They are $3 bucks at Auto-Zone.
Looks like this
Looks like this
12-07-11, 12:09 PM
#119
I'm surprised no one here has mentioned using a spark plug non-fouler for the O2 sensors. I used them for my SRT-4 neon and my Evolution when I replaced the catalytic converter. Neither car threw a CEL, and it seems a lot simpler than having to wire stuff into the ECU. They are $3 bucks at Auto-Zone.
Looks like this
Looks like this
post # 17 from here
https://www.clublexus.com/forums/gs-...eader-gs3.html
my opinion of this is i wouldnt personally do it....removing the O2 sensor from the "stream" effectively makes it worthless and its essentially not monitoring anything which is why it doesnt ever throw a code....which then doesnt help you if you have some unseen engine issue which is what the CEL is trying to tell you but again just my $0.02
Last edited by sakataj; 12-07-11 at 12:12 PM.
12-07-11, 04:22 PM
#120
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Maybe I did not read thoroughly enough or I just simply do not understand what an o2 simulator does, but I thought that the o2 simulator removes the the two o2 sensors that are in the place of the catalytic converter from the car's system. IE: the o2 simulator tricks the ECU into thinking that the sensors are still there and functioning and that a catalytic converter is still in place. I could be wrong though, just trying to learn.
Based off this question and OPs response, seems like the o2 sensors no longer do anything.
Based off this question and OPs response, seems like the o2 sensors no longer do anything.
Just a small question. Why do you still need the o2 sensors in the header if you got an o2 simulator? Isn't the whole point of the o2 sim so that you can remove the o2 sensors without trowing a cel? Also, how is the power improvement? Big difference?
Edit: Ok, nevermind....lol I feel like a fool now. I see that you still have the o2 sensor in place pre-cat. The sim is post-cat(or at least where it used to be
). Makes sense
Edit: Ok, nevermind....lol I feel like a fool now. I see that you still have the o2 sensor in place pre-cat. The sim is post-cat(or at least where it used to be
). Makes sense Actually, you were on to something there. I couldnt remove any of the three O2 sensors so I replaced all of them but I am only using one of them. So the other two have been snipped and are simply there to fill the hole to the tune of $70 a piece. I guess I could have gone to Lexus and ask to dig around in their trash for some but I really didnt care. The O2 simulator wires directly into the ECM which is shown in one of the last several pictures.