mazzuri super headers
Driver
Joined: Oct 2006
Posts: 159
Likes: 0
From: CA
I know it's a long long thread, but just to keep you from having to read the whole thing. I do not have the headers installed. This is just a baseline dyno so we will know gains once the headers are installed. The headers should be down here in a couple of weeks. My access to my friends lift is limited to sundays. This being said, I will do what i can to get them on asap once i get them.
From what I understand the install is not really hard, but not real easy either. I think Daniel/carchitect/lobux and a few others could do it in less than 1-2hrs. I am guessing it will take me and my friend 4-5. Reading here (and talking to carchitect it looks like the drivers side is where it's real tight.
To others:
I talked to carchitect on sunday and time permitting (he is super busy) he might be able to come grab my car this thursday and take it up to Lexus with him. There he will hook up the scan tool and get us more data.
"progress through proxy"
we'll keep the thread updated as progress continues.
From what I understand the install is not really hard, but not real easy either. I think Daniel/carchitect/lobux and a few others could do it in less than 1-2hrs. I am guessing it will take me and my friend 4-5. Reading here (and talking to carchitect it looks like the drivers side is where it's real tight.
To others:
I talked to carchitect on sunday and time permitting (he is super busy) he might be able to come grab my car this thursday and take it up to Lexus with him. There he will hook up the scan tool and get us more data.
"progress through proxy"
we'll keep the thread updated as progress continues.
Thanks for the SAE corrected graphs.
Based on the MPH, it looks like they used 5th gear. If so, there were probably another couple ponies left on the table. It's not that big of a deal, but make sure they do the same next time.
Based on the MPH, it looks like they used 5th gear. If so, there were probably another couple ponies left on the table. It's not that big of a deal, but make sure they do the same next time.
Lexus Fanatic
iTrader: (10)
Joined: Nov 2004
Posts: 13,441
Likes: 1,081
From: Under an IS F since 2008
Some input..
^^ The preferred gear to use on an IS250 & IS350 is 4th gear..
(Using 3rd or 5th is just not good for accurate testing results)
I agree with Lance here on this...
I have independently Dyno tested 3 different IS350's and all put down Base numbers of 264-265 rwhp.. (SAE Corrected and Dyno'd in 4th gear)
This of course was on 3 separate occasions, but using the same DynoJet System, with same operator and pretty much same conditions..
Joe Z
(Using 3rd or 5th is just not good for accurate testing results)
I have independently Dyno tested 3 different IS350's and all put down Base numbers of 264-265 rwhp.. (SAE Corrected and Dyno'd in 4th gear)
This of course was on 3 separate occasions, but using the same DynoJet System, with same operator and pretty much same conditions..
Joe Z
5th gear was never used for any of the pulls. manual mode was set to 4th and it never went past that. Watch the video and count.
How will the peak hp change regardless of where it's plotted on the graph?
How will the peak hp change regardless of where it's plotted on the graph?
Rookie
Joined: Apr 2008
Posts: 78
Likes: 0
From: Florida
Damn, CEL, CHECK VSC, hazard indicator, and tracktion controll light is on. My car is misfiring in random cylinders as well. I am sitting at my dealership right now, typing on their computer. On my way up here I averaged 45.5 MPG, thats a good thing right?
Seriously I am very nervious about my car. The good news is that my service rep here has headers on some of his cars. So he understands what they can and most importantly cant do. He doesnt think the headers are whats causing this issue. He also said that if they cant fix it with the headers on I can remove them and all the work will be covered under warrenty.
I will keep everyone updated on this issue.
Seriously I am very nervious about my car. The good news is that my service rep here has headers on some of his cars. So he understands what they can and most importantly cant do. He doesnt think the headers are whats causing this issue. He also said that if they cant fix it with the headers on I can remove them and all the work will be covered under warrenty.
I will keep everyone updated on this issue.
Advanced
Joined: Mar 2008
Posts: 613
Likes: 0
From: Illinois
Damn, CEL, CHECK VSC, hazard indicator, and tracktion controll light is on. My car is misfiring in random cylinders as well. I am sitting at my dealership right now, typing on their computer. On my way up here I averaged 45.5 MPG, thats a good thing right?
Seriously I am very nervious about my car. The good news is that my service rep here has headers on some of his cars. So he understands what they can and most importantly cant do. He doesnt think the headers are whats causing this issue. He also said that if they cant fix it with the headers on I can remove them and all the work will be covered under warrenty.
I will keep everyone updated on this issue.
Seriously I am very nervious about my car. The good news is that my service rep here has headers on some of his cars. So he understands what they can and most importantly cant do. He doesnt think the headers are whats causing this issue. He also said that if they cant fix it with the headers on I can remove them and all the work will be covered under warrenty.
I will keep everyone updated on this issue.
You are gonna have to pay if it's related to the mods'. Hopfully you will get luck and it will be something else.
Just a suggestion. Good luck.
I won't dispute the 4th gear thing, but I'm surprised that 4th gear will reach 120 MPH. Anyhow, the reason why HP changes based on gear is because gearing loss increases as you get further above or below a 1:1 ratio, and 4th gear is closest to 1:1. If you use 3rd or 5th gear, the whole power curve would shift down a bit.
Rookie
Joined: Apr 2008
Posts: 78
Likes: 0
From: Florida
Super great gas mileage can be a sign of a vacuum leak. Always check the obvious first i.e. the mods'. Not sure about the original health of your car prior to headers etc... but I would confirm that the sleeves on your JoeZ pipe are tight around the throttle body and air box. Air bypassing the MAF sensor is no good. I would not think that the headers are the problem unless one of the sensors is jack'd up.
You are gonna have to pay if it's related to the mods'. Hopfully you will get luck and it will be something else.
You are gonna have to pay if it's related to the mods'. Hopfully you will get luck and it will be something else.
FYI if the issue is related to the headers, I have been told all I need to do is replace them with the stock headers and they will fix my car for free, they will consider it a warrenty issue. Thats the best news I've gotten so far about my problem.
ClubLexus Stories
Celebrating Lexus & Toyota from Around the Globe
Top 10 Most Confusing Things Lexus Has Ever Done!
Joe Kucinski
2026 Lexus ES Review: Lexus Re-Embraces Founding Principles
Michael S. Palmer
10 Lexus Bargains That are Cheaper Than a New Toyota RAV4
Joe Kucinski
8 Weirdest Things Lexus Has Ever Built
Verdad Gallardo
10 Lexus Designs That Have Aged Like Fine Wine
Verdad Gallardo
8 Tips for Improving Your Hybrid or Plug-in Hybrid's Efficiency!
Michael S. Palmer
10 Best Lexus Models No One Remembers
Joe Kucinski
TRD Off-Road Premium: Best 2026 4Runner, Except This One Thing
Michael S. Palmer
Top 10 Lexus & Toyotas to Drive Before You Die!
Joe Kucinski
Rookie
Joined: Apr 2008
Posts: 78
Likes: 0
From: Florida
On another note, while I was at the dealer today I saw Shaun (the dealer who dyno'd a stock 350 for us). He let me drive his car. He has the Lexus HKS exhaust and a K&N filter. Wow, my car is/was definitly faster then his. My car does/did throw you back into your seat a lot more. I was doing this comparision by flooring it at 45mph. We all know that when you do this the car drops into 2nd and takes off. My car definitly throws you back into the seat with much more agression, than his will. Gotta love that butt dyno...
On another note, while I was at the dealer today I saw Shaun (the dealer who dyno'd a stock 350 for us). He let me drive his car. He has the Lexus HKS exhaust and a K&N filter. Wow, my car is/was definitly faster then his. My car does/did throw you back into your seat a lot more. I was doing this comparision by flooring it at 45mph. We all know that when you do this the car drops into 2nd and takes off. My car definitly throws you back into the seat with much more agression, than his will. Gotta love that butt dyno...
Driver
Joined: Oct 2006
Posts: 159
Likes: 0
From: CA
On another note, while I was at the dealer today I saw Shaun (the dealer who dyno'd a stock 350 for us). He let me drive his car. He has the Lexus HKS exhaust and a K&N filter. Wow, my car is/was definitly faster then his. My car does/did throw you back into your seat a lot more. I was doing this comparision by flooring it at 45mph. We all know that when you do this the car drops into 2nd and takes off. My car definitly throws you back into the seat with much more agression, than his will. Gotta love that butt dyno...
Lexus Test Driver
Joined: Sep 2007
Posts: 1,097
Likes: 0
From: Dallas
are the headers getting sent to combfilter any different than the ones listed on the mazzuri website?? i remember Daniel saying something about changing a few things on the comb's.. also when are they getting sent?
