Guest dan4011 Posted August 22, 2006 Share Posted August 22, 2006 when we were piecing together my intercooler set up on my 280z turbo, we decided to place the air flow meter in from of the throttle body instead of on the turbo like original zxt's, it seems to work good if not more efficiantly but ive never really driven a 280zxt other than stock. any views about what you think is better? pros cons Quote Link to comment Share on other sites More sharing options...
stagefumer11 Posted August 22, 2006 Share Posted August 22, 2006 so it seems to be taking the positive boost pressure quite well ? I was told i could not do this. Id love to be able to. Removes a huge restriction front the front of the turbo Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted August 22, 2006 Share Posted August 22, 2006 Several things wrong with this idea: The afm isn't designed to be pressurized. It is now not measuring air at the temperature of outside air, so there is no way that you will have proper A/F ratios. It would probably work ok off boost, but will have problems on boost. Quote Link to comment Share on other sites More sharing options...
Guest dan4011 Posted August 22, 2006 Share Posted August 22, 2006 yea i thought the same thing, i have yet to really get higher into boost because im still breaking the motor in but at about 5-7 lbs it seems to do just fine. no problems. im only running a low amount of boost as it stil has a n/a block (10-12 lbs) so i think this set up will work, ill let you guys know how it does under full boost tho. Quote Link to comment Share on other sites More sharing options...
big-phil Posted August 22, 2006 Share Posted August 22, 2006 I wonder if you can still tune the AFM this way. I'm running 370cc injectors, and my AFM spring is tighter thatn stock. Maybe ?? 14 teeth? Seems like it should work. But the boost in the AFM thing?? How much boost could it take? Quote Link to comment Share on other sites More sharing options...
spotfitz Posted August 23, 2006 Share Posted August 23, 2006 Several things wrong with this idea:It is now not measuring air at the temperature of outside air' date=' so there is no way that you will have proper A/F ratios. [/quote'] I'm not trying to argue with you, I'm just curious. Air temp going into the engine needs to be registered for the engine to know which "fuel map"(I know, not exactly with this ecu) to use for what air temp. If the turbo is raising the air temp going into the engine after the AFM then shouldn't that be registered aswell for proper A/F's? IE: Outside air is 45* and AFM calculates for this, but the turbo has raised temps 20* after the registry to making it 65* inlet air temp. A/F is now not what the ecu is calculated for at 65* I know, this is where the O2 sensor comes in, but that still adjusts what the ecu has already determined to be according to the inlet air. Quote Link to comment Share on other sites More sharing options...
Guest dan4011 Posted August 23, 2006 Share Posted August 23, 2006 I'm not trying to argue with you' date=' I'm just curious.Air temp going into the engine needs to be registered for the engine to know which "fuel map"(I know, not exactly with this ecu) to use for what air temp. If the turbo is raising the air temp going into the engine after the AFM then shouldn't that be registered aswell for proper A/F's? IE: Outside air is 45* and AFM calculates for this, but the turbo has raised temps 20* after the registry to making it 65* inlet air temp. A/F is now not what the ecu is calculated for at 65* I know, this is where the O2 sensor comes in, but that still adjusts what the ecu has already determined to be according to the inlet air.[/quote'] yea i was thinking about that, if you have the afm after the boost and intercooler its measuring the actual air thats going into the intake manifold, where as when on the turbo its not meauring whats actually going into the motor, just what the turbo is pulling in. correct me if im wrong as i am no expert but thats just what im thinking. Quote Link to comment Share on other sites More sharing options...
stagefumer11 Posted August 23, 2006 Share Posted August 23, 2006 Why not just relocate the air temp sensor ? Ive looked at my turbo AFM's i have lying around. And it easy looks like you can remove it, rewire it and put it in the boot infront of the turbo. Easly getting the required Air temps. you could also use the Air temp blacking plate of a N/a AFM Quote Link to comment Share on other sites More sharing options...
rztmartini Posted August 23, 2006 Share Posted August 23, 2006 its measuring the actual air thats going into the intake manifold, where as when on the turbo its not meauring whats actually going into the motor, just what the turbo is pulling in. correct me if im wrong as i am no expert but thats just what im thinking. it still is measuring the amount af air that is going into your engine. the turbo does not add air, just changes the pressure, temp, etc. Quote Link to comment Share on other sites More sharing options...
Guest dan4011 Posted August 23, 2006 Share Posted August 23, 2006 it still is measuring the amount af air that is going into your engine. the turbo does not add air, just changes the pressure, temp, etc. well yea i know its still going to have the same amount of air flowing through no matter what side of the turbo its on, but it seems like it would get a more accurate reading in front of the throttle body Quote Link to comment Share on other sites More sharing options...
rztmartini Posted August 23, 2006 Share Posted August 23, 2006 just switch to the MS MAP sensor and all will be well ... I assume the engineers at nissan put there for a reason. if you have a A/F gauge and can monitor correct mixture then go for it...but then again i am not an engineer... Quote Link to comment Share on other sites More sharing options...
stagefumer11 Posted August 24, 2006 Share Posted August 24, 2006 Well i have a a/f guage. Will show me if i lean out. What would be the max Pressure the afm can take ?. Im running at 15psi atm Quote Link to comment Share on other sites More sharing options...
Clifton Posted August 24, 2006 Share Posted August 24, 2006 Well i have a a/f guage. Will show me if i lean out. Wideand or cheesy rich/lean narrow band gauge. If narrow band you are better off measuring it's actual voltage. Another problem blowing through an afm is the ecu is assuming the airflow through it is at atmosphere. In your case the density varries greatly. The ecu does not know that. Most are fully open at peak torque and you may have enough lag that it won't matter as boost will come about then or a little latter depending on the turbo. Quote Link to comment Share on other sites More sharing options...
wigenOut-S30 Posted August 24, 2006 Share Posted August 24, 2006 what about putting the afm infront of the engine bay and infront of your IC? Would this make a difference in anything? This is a very interesting thread indeed. Quote Link to comment Share on other sites More sharing options...
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