Patrik Neutral Newbie March 27, 2005 Share March 27, 2005 ↡ Advertisement Link to post Share on other sites More sharing options...
Turbonetics 2nd Gear March 27, 2005 Share March 27, 2005 to look at how much boost ur FI is running in...normally in PSI readings.... some can be set to ur own preference... example ur car max boost is 10psi.... den u can set it to anything lower than dat...ie:6psi so it will not exceed dat... not 100% sure...ha ha... Link to post Share on other sites More sharing options...
Kax2 Neutral Newbie March 27, 2005 Share March 27, 2005 (edited) The stock boost gauge is not the most accurate one in the world. Many modifications you make will increase boost even if you don't think they will. As a result, you need to be sure that you are able to accurately know how much boost you are creating. The result of over boosting will be detonation and eventually damage. The stock "boost gauge" does not actually measure pressure. The ECU "calculates" the boost based on information it gets from the Mass Airflow Sensor, temperature, barometric pressure, engine RPM, and some efficiency assumptions. The problem is this is those assumptions are thrown out the window when you mod the car and the ecu is not set up to understand flows above the stock levels. An aftermarket boost gauge measures actual pressure in either psi or bar(kg/cm2) at the manifold. Choose the one that best suits your needs. There are two basic kinds: Boost and Boost/Vac gauges. I recommend the Boost/Vac gauge since vacuum variations can help indicate problems which might be hard to diagnose. It also lets you see the whole range of the turbo's behavior (spool up). Typical gauges read from 30mmHg to either 20, 25, or 30 PSI. I recommend 25 at a minimum for large cc cars. Anything lower will just prove useless in the future Edited March 27, 2005 by Kax2 Link to post Share on other sites More sharing options...
Elfenstar 3rd Gear March 28, 2005 Share March 28, 2005 (edited) Hahahha... ok to actually answer your question, the boost gauge is there to tell you how much boost your turbo is making. turbonetics>> for your injectors, you need software that plugs into your ecu (or can read it) to tell you the injector duty cycle to tell you how they're working. Edited March 28, 2005 by Elfenstar Link to post Share on other sites More sharing options...
Turbonetics 2nd Gear March 28, 2005 Share March 28, 2005 i guess boost gauge is not only for turbos....but superchargers too.... correct me if iam wrong....cheers.... Link to post Share on other sites More sharing options...
Elfenstar 3rd Gear March 28, 2005 Share March 28, 2005 yup, you're right i forgot abt superchargers... a vacuum gauge would be good for a NA car, though I don't know the co-relation between power and amount of vacuum. Link to post Share on other sites More sharing options...
Zrun Neutral Newbie March 28, 2005 Share March 28, 2005 (edited) low vacuum = high load/power high vacuum = low load/power Vacuum is directly related to how much you step on accelerator. If you see low vacuum, it means that you step on it, high vacuum means your throttle is almost closed. The vacuum exists because of the following reasons.. During low throttle: The throttle plate is almost closed, and engine continues to suck air from intake manifold, leading to high vacuum. (or low pressure) During high throttle: The throttle plate is opened, then air flows freely from intake into intake manifold, lead to low vacuum. (higher pressure, comparative to previous case) Note that both "high" and "low" vacuum are lower than atmospheric pressure due to moving air, thus the word "vacuum" is used, rather than "pressure", which usually mean compressed air. IMO, why need a gauge to gauge your foot position? Edited March 28, 2005 by Zrun Link to post Share on other sites More sharing options...
Lordalfa Neutral Newbie March 29, 2005 Share March 29, 2005 That is why on WOT, you need free breathing. Suck in fast, expel it fast. Link to post Share on other sites More sharing options...
Genie47 1st Gear March 29, 2005 Share March 29, 2005 IMO, why need a gauge to gauge your foot position? Could be a diagnostic tool (which it is anyway) if the car is really old. Consider it a cheapoman's AFR monitor or OBD reader. Link to post Share on other sites More sharing options...
Thumbs Neutral Newbie March 30, 2005 Share March 30, 2005 The stock boost gauge is not the most accurate one in the world. Many modifications you make will increase boost even if you don't think they will. As a result, you need to be sure that you are able to accurately know how much boost you are creating. The result of over boosting will be detonation and eventually damage. The stock "boost gauge" does not actually measure pressure. The ECU "calculates" the boost based on information it gets from the Mass Airflow Sensor, temperature, barometric pressure, engine RPM, and some efficiency assumptions. The problem is this is those assumptions are thrown out the window when you mod the car and the ecu is not set up to understand flows above the stock levels. An aftermarket boost gauge measures actual pressure in either psi or bar(kg/cm2) at the manifold. Choose the one that best suits your needs. There are two basic kinds: Boost and Boost/Vac gauges. I recommend the Boost/Vac gauge since vacuum variations can help indicate problems which might be hard to diagnose. It also lets you see the whole range of the turbo's behavior (spool up). Typical gauges read from 30mmHg to either 20, 25, or 30 PSI. I recommend 25 at a minimum for large cc cars. Anything lower will just prove useless in the future Where did you copy-paste this from? It contains a lot of outright errors. Link to post Share on other sites More sharing options...
Thumbs Neutral Newbie March 30, 2005 Share March 30, 2005 turbonetics>> for your injectors, you need software that plugs into your ecu (or can read it) to tell you the injector duty cycle to tell you how they're working. Not necessary. You can just use a DSO. Link to post Share on other sites More sharing options...
Thumbs Neutral Newbie March 30, 2005 Share March 30, 2005 IMO, why need a gauge to gauge your foot position? Because although boost is related to throttle position, it is not the same thing. e.g. for cars running with antilag, TPS has low voltage, yet car is already making boost... Link to post Share on other sites More sharing options...
Thumbs Neutral Newbie March 30, 2005 Share March 30, 2005 Could be a diagnostic tool (which it is anyway) if the car is really old. Consider it a cheapoman's AFR monitor or OBD reader. Use the right tool for the job. Just because a spanner is hard, doesn't mean that you should use it to hammer nails. Link to post Share on other sites More sharing options...
Genie47 1st Gear March 30, 2005 Share March 30, 2005 It is the right tool if your car is carburetted. Most install a vac gauge w/o knowing how to read it. Link to post Share on other sites More sharing options...
Robin 4th Gear March 31, 2005 Share March 31, 2005 low vacuum = high load/powerhigh vacuum = low load/power IMO, why need a gauge to gauge your foot position? The level of vacuum can also determine your FC/how efficiently you are driving. Low vacuum = more fuel is burnt. High vacuum = less fuel consumed foot position? i dunno Link to post Share on other sites More sharing options...
Dennisk Clutched March 31, 2005 Share March 31, 2005 how much is vaccum meter? where to get? Link to post Share on other sites More sharing options...
Robin 4th Gear April 1, 2005 Share April 1, 2005 u can check at most car accessory shops. they should carry it as its quite a common item. If u are not brand conscious (n go for delpi brand) the jap/taiwanese bands go for 40-70 bucks.. depending on the type of function (water temp, volt, vacuum, boost etc) Link to post Share on other sites More sharing options...
Lordalfa Neutral Newbie April 1, 2005 Share April 1, 2005 For NA cars, any vacuum condition is on part throttle. ZERO Vacuum or atmospheric is considered WOT. For FI, any reading above atmospheric is boost condition. More fuel will be injected and viola; torque. ↡ Advertisement Link to post Share on other sites More sharing options...
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