I have CTSC and people say I need air/fuel ratio and booth gauges. I know A/F gauge help you see if the car is running lean or rich. But if I attach the A/F to O2 all it show is from lean to rich when I step on the gas. How do I know how rich or how lean? And do I really need all the gauges? I just want to make sure my SC won't damange my engine.
why all the gauges
- Thread starter Wheel
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this is just my opinion and we all have them.I believe in gauges..but gauges that really work.for a s/c which btw I dont have I would get those two gauges.the boost will tell you how much psi your pushing or if something is wrong with your f/i system and the a/f for me is a must but dont waste your money on a crappy a/f gauge that attaches to your stock o2 worthless imho.go with a five wire motec type setup.it will give precise info of your ratio.just my 02 worth.and as stated before I dont have a supercharger.I run nos and theres no way I would feel safe without monitoring the system while spraying
david
david
Yellow Rose
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Wheel - Carma is absolutely correct. The cheapo AF gauges that display dancing lights are worthless. Period. They may look cool, but do not quantify the exact AF. If you are into tuning, the *exact* AF ratio reading is a must.
While Motec offers high quality five-wire O2 sensors, I will get one from FJO.
On a closing note, I used to have a CTSC - first a 6 PSI unit then a 9 PSI unit. If that is all you do, Comptech has done a superb job of packaging the unit and an AF gauge is a waste of money. JMO.
While Motec offers high quality five-wire O2 sensors, I will get one from FJO.
On a closing note, I used to have a CTSC - first a 6 PSI unit then a 9 PSI unit. If that is all you do, Comptech has done a superb job of packaging the unit and an AF gauge is a waste of money. JMO.
I have one of those worthless digital A/F gauges. That is exactly what they are. They look cool but do nothing.
Yellow Rose
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Do I need to monitor the fuel pressure for the CTSC?
My thought is "no". When the blower is making boost with the engine under load, you can hear the fuel pump relay click to the "on" position at about 4000 RPM. The relay is behind your head, under the the black panel. If you hear the click, then by default the required fuel pressure is met.
My thought is "no". When the blower is making boost with the engine under load, you can hear the fuel pump relay click to the "on" position at about 4000 RPM. The relay is behind your head, under the the black panel. If you hear the click, then by default the required fuel pressure is met.
Yellow Rose
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Andy, Do you plan on running the FJO sensor all the time? or just for tuning?
All the time, I just haven't yet decided where to locate the display unit.
Every once in a while, I will disconnect the display unit and plug the controller into a laptop, for datalogging / tuning. Much more precise than tuning on a dyno. This is hugely important on a boosted NSX. The ultimate boost level I am targeting is 9-10 PSI.
All the time, I just haven't yet decided where to locate the display unit.
Every once in a while, I will disconnect the display unit and plug the controller into a laptop, for datalogging / tuning. Much more precise than tuning on a dyno. This is hugely important on a boosted NSX. The ultimate boost level I am targeting is 9-10 PSI.
I agree with Andy,while we are using different hp increasers we want to have the same realtime data on A/F available all the time and as he stated for logging per tuning ect.and the data is precise like on a dyno wideband a/f data
david
Street tuning and dyno tuning are both very accurate if done with a good quality meter. Street tuning is superior in my opinion because it simulates actual driving conditions. Generally at the dyno you tune wide open throttle maps. It's VERY costly to try to make partial throttle maps, which are much more important in a street driven car. Wide open is just part of the tuning puzzle......part throttle maps will take at least 10 times longer.
Andy how are you going to adjust the A/F with the Splitsecond controller? Does it really have a fuel map where you can adjust on a set RPM/load basis...or is it just a static fuel 'trim'? What is the 'map's' resolution?
So back to Wheel's question; I would say choosing gauges really depends on exactly how far you are going with your car. If you plan on doing tuning yourself or raising boost etc. Give us some details on your plans and I'll tell you what gauges (if any) I would choose.
Andy how are you going to adjust the A/F with the Splitsecond controller? Does it really have a fuel map where you can adjust on a set RPM/load basis...or is it just a static fuel 'trim'? What is the 'map's' resolution?
So back to Wheel's question; I would say choosing gauges really depends on exactly how far you are going with your car. If you plan on doing tuning yourself or raising boost etc. Give us some details on your plans and I'll tell you what gauges (if any) I would choose.
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Yellow Rose
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Andy how are you going to adjust the A/F with the Splitsecond controller? Does it really have a fuel map where you can adjust on a set RPM/load basis...or is it just a static fuel 'trim'? What is the 'map' resolution?
A-F ratio is adjusted while the car is driven, with an FJO wide-band O2 sensor feeding info to the laptop. One person drives the car while the person riding shotgun monitors A-F ratio. Adjustments are made to the fuel map and timing map as the car is being driven. You bring up a very good point - this method of tuning allows part throttle tuning as well as wide open throttle tuning.
Yes, the Split Second controller does have adjustable fuel map and timing map. I do not know what the resolution is, but it is felt to be not good enough for high boost applications. As mentioned by NRS on another thread, my car tested yesterday at 4 PSI. Until the engine management controller issue is resolved, we will limit boost to 6 PSI with the Split Secong controller. Eventually with the right controller, boost will be increased to 9 PSI.
A-F ratio is adjusted while the car is driven, with an FJO wide-band O2 sensor feeding info to the laptop. One person drives the car while the person riding shotgun monitors A-F ratio. Adjustments are made to the fuel map and timing map as the car is being driven. You bring up a very good point - this method of tuning allows part throttle tuning as well as wide open throttle tuning.
Yes, the Split Second controller does have adjustable fuel map and timing map. I do not know what the resolution is, but it is felt to be not good enough for high boost applications. As mentioned by NRS on another thread, my car tested yesterday at 4 PSI. Until the engine management controller issue is resolved, we will limit boost to 6 PSI with the Split Secong controller. Eventually with the right controller, boost will be increased to 9 PSI.
status=limbo price 1200 if you shop around
david
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