Intake Temperature Test- Fujita vs Stock
#16
How many people gonna band wagon jump again?
It's my opinion that while the aluminum does cool faster and there is a mild horsepower increase, the true culprit is the throttle body. I'm not willing to disconnect the coolant flow and run the risk of a leak. So if the throttle body will always be hot, I don't see the rationale for a $300 plus intake no matter what the brand for my particular driving style.
What are the pros and cons? It had to have been there for some reason.
#17
Registered User
The coolant is there for folks like me that drive in freezing weather. It keeps ice crystals in the intake air from entering the motor and it also keeps the butterfly from freezing in a stuck position. Nissan loves this and has it on all of its new vehicles if I'm not mistaken.
#20
Registered User
#21
First, congrats to Ampd and ironchef for the great work. Very informative.
But... before anyone starts tampering with the coolant lines, consider this. Computers WILL lie if you're feeding them bad data.
The ECU software will often make decisions based on parameter ratios rather than the parameters themselves. Having said that, this coolant mod sounds like GIGO waiting to happen. "Garbage in, garbage out".
I'm no expert on the Nissan ECU but I CAN tell you that, in my line of work, we use ratios all the time. Say the ECU wants to make a decision based on coolant temp vs. air intake temp and you've altered the coolant lines. That means you've provided "garbage in" to the ECU.
Think about CEL problems the test pipe/HFC community has. Those CELs don't cause much trouble because they are downstream in the air/fuel system. Now you're looking at upstream problems and that's an entirely different story.
There are some things you just don't want to mess with.
My .02.
Kahn - principal software engineer, vehicle automated diagnostic systems
But... before anyone starts tampering with the coolant lines, consider this. Computers WILL lie if you're feeding them bad data.
The ECU software will often make decisions based on parameter ratios rather than the parameters themselves. Having said that, this coolant mod sounds like GIGO waiting to happen. "Garbage in, garbage out".
I'm no expert on the Nissan ECU but I CAN tell you that, in my line of work, we use ratios all the time. Say the ECU wants to make a decision based on coolant temp vs. air intake temp and you've altered the coolant lines. That means you've provided "garbage in" to the ECU.
Think about CEL problems the test pipe/HFC community has. Those CELs don't cause much trouble because they are downstream in the air/fuel system. Now you're looking at upstream problems and that's an entirely different story.
There are some things you just don't want to mess with.
My .02.
Kahn - principal software engineer, vehicle automated diagnostic systems
#22
Banned
iTrader: (26)
First, congrats to Ampd and ironchef for the great work. Very informative.
But... before anyone starts tampering with the coolant lines, consider this. Computers WILL lie if you're feeding them bad data.
The ECU software will often make decisions based on parameter ratios rather than the parameters themselves. Having said that, this coolant mod sounds like GIGO waiting to happen. "Garbage in, garbage out".
I'm no expert on the Nissan ECU but I CAN tell you that, in my line of work, we use ratios all the time. Say the ECU wants to make a decision based on coolant temp vs. air intake temp and you've altered the coolant lines. That means you've provided "garbage in" to the ECU.
Think about CEL problems the test pipe/HFC community has. Those CELs don't cause much trouble because they are downstream in the air/fuel system. Now you're looking at upstream problems and that's an entirely different story.
There are some things you just don't want to mess with.
My .02.
Kahn - principal software engineer, vehicle automated diagnostic systems
But... before anyone starts tampering with the coolant lines, consider this. Computers WILL lie if you're feeding them bad data.
The ECU software will often make decisions based on parameter ratios rather than the parameters themselves. Having said that, this coolant mod sounds like GIGO waiting to happen. "Garbage in, garbage out".
I'm no expert on the Nissan ECU but I CAN tell you that, in my line of work, we use ratios all the time. Say the ECU wants to make a decision based on coolant temp vs. air intake temp and you've altered the coolant lines. That means you've provided "garbage in" to the ECU.
Think about CEL problems the test pipe/HFC community has. Those CELs don't cause much trouble because they are downstream in the air/fuel system. Now you're looking at upstream problems and that's an entirely different story.
There are some things you just don't want to mess with.
My .02.
Kahn - principal software engineer, vehicle automated diagnostic systems
I agree, i wouldn't mess with the coolant lines.
#26
Registered User
iTrader: (3)
5hp kept. meaning throughout dyno runs the hp would drop 5 hp over a span of runs because the coolant would heat the TB. when the bypass was done we never saw a drop in hp. so while your not really gaining hp its more of the simple fact your not loosing hp. I would see the gains on this car being larger as we have two TB's
#30
Like the S2000, the ECU in our cars and older G35's will be fine with the mod. It's more of a warranty issue. You're essentially bypassing a major component and it may be considered as a reason for denying coverage. If done right though, the mod could always be removed prior to service and here's the link to the most widely used one on older G's:
http://motordyneengineering.com/cata...products_id=47
http://motordyneengineering.com/cata...products_id=46
You would have to contact Motordyne to inquire about getting double of one of these kits minus the gaskets, which I believe won't work on our G37's.
http://motordyneengineering.com/cata...products_id=47
http://motordyneengineering.com/cata...products_id=46
You would have to contact Motordyne to inquire about getting double of one of these kits minus the gaskets, which I believe won't work on our G37's.
Last edited by ironchef2008; 07-19-2009 at 09:41 AM.