PPE Headers on IS250
02-17-10, 07:36 AM
#48
I don't make intakes, so I can't say anything there, but when it comes to making a header at this point I can make one blind.
A good example I can give you is Burns Stainless, you give them your motor specs and they give you some numbers, follow those numbers and you will have a header that will make great power. I have my own formulas that I use and have used it to make a header for the RX8, **** load of Hondas, is300, IS250, many turbo cars and have always made a lot more power.
As for R&D I spend 6 months on it, I even bought a 250 for it. Everything between the 350 and the 250 is exactly the same as far as headers and fitment goes, I verified this.
With all that said, I could have spit out some BS 350 numbers had a graph made, would that have made you feel more "safe". The bottom line is, the headers will not make less than what the 250 made, and that much power from a header is a huge addition to any car.
A good example I can give you is Burns Stainless, you give them your motor specs and they give you some numbers, follow those numbers and you will have a header that will make great power. I have my own formulas that I use and have used it to make a header for the RX8, **** load of Hondas, is300, IS250, many turbo cars and have always made a lot more power.
As for R&D I spend 6 months on it, I even bought a 250 for it. Everything between the 350 and the 250 is exactly the same as far as headers and fitment goes, I verified this.
With all that said, I could have spit out some BS 350 numbers had a graph made, would that have made you feel more "safe". The bottom line is, the headers will not make less than what the 250 made, and that much power from a header is a huge addition to any car.
02-17-10, 07:41 AM
#49
I imagine they'd physically fit (RWD anyway) but it's not a very good idea to use headers designed for an entirely different displacement engine.
There's a lot of engineering that goes into properly designing and sizing headers and it's entirely possible to reduce power by using the wrong ones.
What's kinda interesting about that Mazzuri quote is that when his 350 headers were later actually tested they made a lot less hp than his 250 ones did on a 250. In one dyno test they actually lost hp from stock (though very little).
There's a lot of engineering that goes into properly designing and sizing headers and it's entirely possible to reduce power by using the wrong ones.
What's kinda interesting about that Mazzuri quote is that when his 350 headers were later actually tested they made a lot less hp than his 250 ones did on a 250. In one dyno test they actually lost hp from stock (though very little).
Last edited by Kurtz; 02-17-10 at 11:46 AM.
02-20-10, 11:49 AM
#51
This in interesting. I have the Mazzuri headers with a electronic sim of sorts. It prevents the CEL from coming on which is a good thing.
However, I have noticed that the my vehicle now always displays a 'yellow' LED status when monitoring the ODBII system. So it looks like the vehicle hasn't completed some diagnostic sequence even though I have driven over 30,000 miles on the headers.
The OBDII system needs to have a green status to pass emissions in my state.
How complete is your solution in that regard? Any possibility that you would sell the O2 sensor extension separately? I’d like to get one and try it out.
However, I have noticed that the my vehicle now always displays a 'yellow' LED status when monitoring the ODBII system. So it looks like the vehicle hasn't completed some diagnostic sequence even though I have driven over 30,000 miles on the headers.
The OBDII system needs to have a green status to pass emissions in my state.
How complete is your solution in that regard? Any possibility that you would sell the O2 sensor extension separately? I’d like to get one and try it out.
02-20-10, 12:11 PM
#52
Tech Info Resource
iTrader: (2)
CHECKING MONITOR STATUS
The purpose of the monitor result (mode 06) is to allow access to the results for on-board diagnostic monitoring tests of specific components/systems that are not continuously monitored. Examples are catalyst, evaporative emission (EVAP) and thermostat.
The monitor result allows the OBD II scan tool to display the monitor status, test value, minimum test limit and maximum test limit. These data are displayed after the vehicle has been driven to run the monitor.
When the test value is not between the minimum test limit and maximum test limit, the ECM (PCM) interprets this as a malfunction. When the component is not malfunctioning, if the difference of the test value and test limit is very small, the component will malfunction in the near future.
Perform the following instruction to view the monitor status. Although this instruction reference the Lexus/Toyota diagnostic tester, it can be checked using a generic OBD II scan tool. Refer to your scan tool operator's manual for specific procedures....
The purpose of the monitor result (mode 06) is to allow access to the results for on-board diagnostic monitoring tests of specific components/systems that are not continuously monitored. Examples are catalyst, evaporative emission (EVAP) and thermostat.
The monitor result allows the OBD II scan tool to display the monitor status, test value, minimum test limit and maximum test limit. These data are displayed after the vehicle has been driven to run the monitor.
When the test value is not between the minimum test limit and maximum test limit, the ECM (PCM) interprets this as a malfunction. When the component is not malfunctioning, if the difference of the test value and test limit is very small, the component will malfunction in the near future.
Perform the following instruction to view the monitor status. Although this instruction reference the Lexus/Toyota diagnostic tester, it can be checked using a generic OBD II scan tool. Refer to your scan tool operator's manual for specific procedures....
04-15-10, 05:49 PM
#58
The 250 headers should be about ready from what I hear too so you guys should be good to go very soon!
04-18-10, 08:42 PM
#60
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Waiting for more info and numbers, too...