Tuning ??'s AAM/UTEC/TN ST
Tuning ??'s AAM/UTEC/TN ST
I'm have spent tons of time reading and learning what I can from this forum. It has been a great reasource and thanks to everyone for sharing their experiences.
As I said, I have spent hours reading threads and it has been invaluable. Last summer I got back into the Z-Car world after about 20-years of absence (owned a couple 280ZX Turbos). I've always loved the cars.
I decided to go FI and am doing the following mods to my '04 Roadster:
Mike with AAM has been a huge help - Thanks again Mike. So, with Mike's input we will be doing the initial Tune and if needed I will ship the car out to get it dyno tuned later.
There are a few questions that I would appreciate input on that I haven't been able to find seraching the forum.
1. I've read a fair amount on the tuning process and from my calculations to get the fuel I will need at high engine load I may need to run a fuel pressure as high as 68psi with the 440cc injectors supplied to me with the Turbonetics Kit I bought. I came to this through calculations out of Ben Strader's Tuner Manual assuming max 500 FWHP (best case) and a Brake Specific Fuel Consumption (BSFC) of 0.65 (worst case). If my calculations are right, is there a problem running a fuel pressures of 68psi, or should I go to larger injectors??
2. Will jacking up the fuel pressure like this affect the injector parameters in the TurboXS UTEC?
3. I've tried to get a handle on target A/F rations for my setup. I've seen some conflicting opinions on what the ideal A/F range should be for a FI Z. At this point it looks like 10.5-11.5 for my set up under high load. Any help on what the right target A/F should be would be appreciated.
I am also open to any other input and/or suggestion.
Thanks again for all who have made this forum such a wealth of info and have taken the time to read my lengthy post!
Mark
As I said, I have spent hours reading threads and it has been invaluable. Last summer I got back into the Z-Car world after about 20-years of absence (owned a couple 280ZX Turbos). I've always loved the cars.
I decided to go FI and am doing the following mods to my '04 Roadster:
- Turbonetics Single Turbo Tuner Kit
- AAM ECU Re-Flash
- AAM Spec 1 Fuel Return System
- AAM Spec Angled Intake Plenum Spacer
- AAM Spec Oil Pan Spacer w/ Line Kit
- Turbo XS UTEC
- TurboXS UTEC MAP Sensor
- TurboXS Tuner Reg Wideband
- Walbro 255LPH Fuel Pump
- RC 440cc Injectors
- JWT Aluminum Fly Wheel
- JWT Heavy Duty Clutch
- NISMO Cat-Back Exhaust
- Test Pipe
- Greddy SMI Meters
- SMI Integrate Controller
- Boost Meter
- EGT Meter
- Fuel Pressure Meter
Mike with AAM has been a huge help - Thanks again Mike. So, with Mike's input we will be doing the initial Tune and if needed I will ship the car out to get it dyno tuned later.
There are a few questions that I would appreciate input on that I haven't been able to find seraching the forum.
1. I've read a fair amount on the tuning process and from my calculations to get the fuel I will need at high engine load I may need to run a fuel pressure as high as 68psi with the 440cc injectors supplied to me with the Turbonetics Kit I bought. I came to this through calculations out of Ben Strader's Tuner Manual assuming max 500 FWHP (best case) and a Brake Specific Fuel Consumption (BSFC) of 0.65 (worst case). If my calculations are right, is there a problem running a fuel pressures of 68psi, or should I go to larger injectors??
Here's my calculation that brought me to this:
Fuel Requirement = HP * BSFC = lbs of fuel per hour
lbs of fuel per hour * 10.2 = cc's/min
(cc's/min) / (# cylinders) = cc's/min per injector
All of this gets me to 552.5 cc/min injector requirement. My understanding is that you want to keep your injector max duty cycle at 80%, so that means the injector flow rating at this point would be 690 cc/min. In order to get the nominal 440cc/min injectors to flow at this rate the fuel pressure needs to be about 68 psi (or 59% higher than the standard 43.5 psi injector rating point)
Fuel Requirement = HP * BSFC = lbs of fuel per hour
lbs of fuel per hour * 10.2 = cc's/min
(cc's/min) / (# cylinders) = cc's/min per injector
All of this gets me to 552.5 cc/min injector requirement. My understanding is that you want to keep your injector max duty cycle at 80%, so that means the injector flow rating at this point would be 690 cc/min. In order to get the nominal 440cc/min injectors to flow at this rate the fuel pressure needs to be about 68 psi (or 59% higher than the standard 43.5 psi injector rating point)
2. Will jacking up the fuel pressure like this affect the injector parameters in the TurboXS UTEC?
3. I've tried to get a handle on target A/F rations for my setup. I've seen some conflicting opinions on what the ideal A/F range should be for a FI Z. At this point it looks like 10.5-11.5 for my set up under high load. Any help on what the right target A/F should be would be appreciated.
I am also open to any other input and/or suggestion.
Thanks again for all who have made this forum such a wealth of info and have taken the time to read my lengthy post!
Mark
ok your list looks ok but you don't need a reflash and a Utec. Just a utec will do. As for your injectors, should should be fine with 440's as long as your stock block and won't be getting into high boost. Your base FP should be set around 50 and with a 1 to 1 ratio FPR it will go up 1 psi for every psi of boost you are in. So if you start out @ 50psi and build 8 psi of boost your FP will be @ 58psi. After you set this up you can go into the utec and control the injector. You wanna tune your A/F around 11.2-11.5.
Originally Posted by ZU L8R
ok your list looks ok but you don't need a reflash and a Utec. Just a utec will do. As for your injectors, should should be fine with 440's as long as your stock block and won't be getting into high boost. Your base FP should be set around 50 and with a 1 to 1 ratio FPR it will go up 1 psi for every psi of boost you are in. So if you start out @ 50psi and build 8 psi of boost your FP will be @ 58psi. After you set this up you can go into the utec and control the injector. You wanna tune your A/F around 11.2-11.5.
You could go to larger injectors; I believe you can get a set of RC 550's for about $590 (from AAM's website), and considering how much you are allready spending, that is not really all that much difference.
The larger injectors would give you the ability to go to higher boost in the future, and add in some safety room as well. And I have been told that 550's will not affect your idle smoothness.
Dave
The larger injectors would give you the ability to go to higher boost in the future, and add in some safety room as well. And I have been told that 550's will not affect your idle smoothness.
Dave
Originally Posted by Dave 90TT
You could go to larger injectors; I believe you can get a set of RC 550's for about $590 (from AAM's website), and considering how much you are allready spending, that is not really all that much difference.
The larger injectors would give you the ability to go to higher boost in the future, and add in some safety room as well. And I have been told that 550's will not affect your idle smoothness.
Dave
The larger injectors would give you the ability to go to higher boost in the future, and add in some safety room as well. And I have been told that 550's will not affect your idle smoothness.
Dave
I am not trying to skimp. But also don't want to do something that isn't neccesary. If the 440's will work, they are already installed...
Thanks for your input!
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The 440's will certainly work, going bigger will just add a margin of safety, but is not necessary. However, if you are putting in the AAM system, you will have it torn down to the fuel rails anyways, and the installation of new injectors, at that point would take 30 minutes.
Changing the injector parameters in the UTEC is easy, I believe it is just a one line entry.
Anyways, either way you go, it will be fun!
Changing the injector parameters in the UTEC is easy, I believe it is just a one line entry.
Anyways, either way you go, it will be fun!
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