mazzuri super headers
03-06-08, 07:56 PM
#241
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But this is the 250 right? I know the exhaust configuration is simular, but it's still not the 350. I'd love to do the headers, but I would really like to see how it changes the torque curve, and if it really raises the average hp across the usable revs, or if it justs creates a higher peak. And from what I have benn looking at, it almost seems that you would have to run a piggyback on the ECU to really help shape the power. So, if I were to just put the headers on, what does that look like and how much different or better would it be to put the piggy back on? Suddenly it doesn't look like it's a few bolts and few hours changing headers, but tuning and dyno ing also. Am I reading to much into this?
BTW, Mazzuri, hats off anyway for a great job on the headers.
BTW, Mazzuri, hats off anyway for a great job on the headers.
When I make my headers I always design them to make power in the low and mid range the most, because 95% of my customers DD the cars, and don't need 25WHP at 6500 RPMs and lose TQ down low. I have made race specific headers that have gains more at the top than down low. So with that said, I am sure the gains will be just as uniform on the 350 as it's on the 250.
When you change parts on a car, you veer off the tune that the car has, so you do need to retune it to gain the maximum gains and is for people who have the time/money and want everything to be at the max. You can still put the headers on and nothing else needs to be added/changed, you can add/do all the other stuff as times goes on.
Thank you.
03-06-08, 08:02 PM
#242
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Here is something I want you guys with some ideas to think about.
With the header on, sometimes very rarely under certain conditions (for me it happened ones when the car was cold and I gunned it withou warming it up) the car will "misfire" from what I can tell and will go in to limp mode, cuts most of the power and I think you can't rev past 3k (not sure about this). Turning the car off and on again, fixes the problem. Today this same thing happened to Ian.
I am thinking it's a misfire due to the engine needed better gas, now that it can breathe better. I filled up a tank of 100 when I had the header on and the car loved it.
What do you guys think?
With the header on, sometimes very rarely under certain conditions (for me it happened ones when the car was cold and I gunned it withou warming it up) the car will "misfire" from what I can tell and will go in to limp mode, cuts most of the power and I think you can't rev past 3k (not sure about this). Turning the car off and on again, fixes the problem. Today this same thing happened to Ian.
I am thinking it's a misfire due to the engine needed better gas, now that it can breathe better. I filled up a tank of 100 when I had the header on and the car loved it.
What do you guys think?
03-07-08, 09:10 AM
#244
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Video is up so you can hear how my IS 250 sounds with AFE Intake, Tanabe Exshaust, and Mazzuri Headers.
I have put over 100 miles on the headers so far and the base tone that entered the cabin before has begun to go away, and I am liking the sound alot.
If you watch the video the first couple gears is normal driving under 3000rpms. After that I drop back into a lower gear and gun it. Then I run out of road
so I slow down pretty quick, but you should be able to get the idea. The sound is getting better and better.
http://www.youtube.com/watch?v=aEGxZboFmj0
I have put over 100 miles on the headers so far and the base tone that entered the cabin before has begun to go away, and I am liking the sound alot.
If you watch the video the first couple gears is normal driving under 3000rpms. After that I drop back into a lower gear and gun it. Then I run out of road
so I slow down pretty quick, but you should be able to get the idea. The sound is getting better and better.http://www.youtube.com/watch?v=aEGxZboFmj0
Last edited by CrazyIS; 03-07-08 at 10:37 AM.
