mazzuri super headers
Advanced
Joined: Mar 2008
Posts: 613
Likes: 0
From: Illinois
I think that ndk83 was refering to the stock manifolds being purpose built for the IS350 and then used on the 250s regardless. That's been my theory for some time now. I am not having much luck with the AWD version but am looking into a solution.
Last edited by Gaugster; Sep 3, 2008 at 07:11 AM.
Lexus Champion
Joined: Jun 2008
Posts: 2,297
Likes: 2
From: Ga
When I was running the headers on my 07,350 I gained something like 7 hp and 35+ wtq. The dynos are some where in this long thread. I removed them because I started having misfires. After removing the headers my car has ran perfectly. I am not sure why I showed the most gain out of 350's then started having the misfire. Maybe my ECU rejected the headers after a while, and started running too lean. On my dyno charts the AFR looked good. But, I obviously wasnt misfireing at the time of the dyno. I can say, I felt a difference with the headers. I installed the headers and uninstalled them three times. The first time I didnt notice an increase, I think it just took the car some time to get used to the headers. The other times I felt the increase right away.
I am currently interested in installing my headers onto another 350. I just need someone to commit to it. I have been in PM's with someone on this thread. I hope to eventualy install them on his car.
I am currently interested in installing my headers onto another 350. I just need someone to commit to it. I have been in PM's with someone on this thread. I hope to eventualy install them on his car.
I would buy them for you if i didnt have an 08 model.
Erikbakers dyno results are here-
https://www.clublexus.com/forums/sho...&postcount=632
The results are completely unreliable however since the "stock" plot is obviously not valid (hp and torque do not cross at 5250 as physics requires them to)
They do cross at 5250 on the "after" graph but given both are from the same dyno we can't really trust either result...
I vaguely recall the dyno flat out broke right after one of these pulls so it was certainly already unreliable during the pull.... I think this was the "stock" one, done on a different stock IS350, as EB didn't dyno his own car before the headers (which makes comparing them even less usefull).
So no offense at all intended to EB, but his results can't really be counted as proving any specific gains at all given the dyno problems and the fact we're not even comparing the same car
https://www.clublexus.com/forums/sho...&postcount=632
The results are completely unreliable however since the "stock" plot is obviously not valid (hp and torque do not cross at 5250 as physics requires them to)
They do cross at 5250 on the "after" graph but given both are from the same dyno we can't really trust either result...
I vaguely recall the dyno flat out broke right after one of these pulls so it was certainly already unreliable during the pull.... I think this was the "stock" one, done on a different stock IS350, as EB didn't dyno his own car before the headers (which makes comparing them even less usefull).
So no offense at all intended to EB, but his results can't really be counted as proving any specific gains at all given the dyno problems and the fact we're not even comparing the same car
Last edited by Kurtz; Sep 3, 2008 at 07:48 AM.
Rookie
Joined: Apr 2008
Posts: 78
Likes: 0
From: Florida
The dyno broke after the other 350 that is true.
I did however eventualy dyno my car after removing the headers. This was done on the same dyno so take it for what its worth.
The graph is a little off on the first dyno, but the numbers, I was told are acurite. It is just the location on the graph that was off. The guy owes me another dyno pull because of this. Check out post #790, that what I came up with after all this...
I did however eventualy dyno my car after removing the headers. This was done on the same dyno so take it for what its worth.
The graph is a little off on the first dyno, but the numbers, I was told are acurite. It is just the location on the graph that was off. The guy owes me another dyno pull because of this. Check out post #790, that what I came up with after all this...
Pole Position
Joined: Jun 2007
Posts: 2,827
Likes: 2
From: DXB / AD
yup you understood correctly, thanks. Been following ur story/posts on my.is Good luck with that
Last edited by ndk83; Sep 3, 2008 at 09:56 PM.
I need some custom work done if anyone knows how to reach him please PM me that info. 
wierd thing happened today. after having the headers and the sim chip working fine for about 8k miles, the cel finally tuned on for the first time. has this ever happened to anyone else? how did you fix it?
Advanced
Joined: Mar 2008
Posts: 613
Likes: 0
From: Illinois
I have a bit less miles then you on the headers but no CEL.
How do you know it is related to the headers? Did you read the code. I guess my point is that it could be some other problem that is not related with the headers.
How do you know it is related to the headers? Did you read the code. I guess my point is that it could be some other problem that is not related with the headers.
