jerryb Posted February 12, 2007 Share Posted February 12, 2007 Im in the final details of setting up my RB20 and am working out the gauge details. ..... excuse my ignorance but.....why would one want a boost vacuum gauge over a straight boost gauge. Im thinking of going boost only as its a cleaner scale. Is knowing the vacuum important on a boosted engine?? I dont get it! Thanx Quote Link to comment Share on other sites More sharing options...
TONY C Posted February 12, 2007 Share Posted February 12, 2007 I Like My Boost/vac Gauge For 3 Reasons. 1. Gives You More Accurate Timing On When The Boost Is Going To Come On. Like Approching A Curve At Lower Speeds. 2. When Tuning. Watching Your Speed And Rpms Are Very Broad In Change And Not As Precise.. A Vac Gauge Will Help You Keep A More Even Feel On The Throttle For Constant AND consistant Pulls During Tuning. 3. Knowing The Vaccuum A Certain Engine Pulls, Will Help To Figure Out What Spring Is Needed In The Bov. Quote Link to comment Share on other sites More sharing options...
GrayZee Posted February 12, 2007 Share Posted February 12, 2007 I agree, vacuum reading are handy for several reasons. I would always choose a dual gauge over straight vacumm. Quote Link to comment Share on other sites More sharing options...
MrFancypants Posted February 12, 2007 Share Posted February 12, 2007 Me 3 on vacuum being worth it. I dont see why you'd want just positive pressure. Vacuum is a useful thing to know. - Greg - Quote Link to comment Share on other sites More sharing options...
synthtk Posted February 13, 2007 Share Posted February 13, 2007 I also will always take a vac/boost gauge over just boost for the reasons mentioned above and the fact that you are not always in boost, and in reality for most cars you are seldom in boost just cruising around or low load situations so knowing where there is problems vac side can help with tuning. Quote Link to comment Share on other sites More sharing options...
Z U L8R Posted February 13, 2007 Share Posted February 13, 2007 not like this pertains to these particular motors, but when my brother had his fd (93 rx7) he heard a pop noise while on the highway and after that it had a rattle to it at idle. so when he got the car home i could hear the rattle and it sounded like it was coming from where the turbos bolts up to the housing. so i'm thinking maybe one of his turbo's took a ♥♥♥♥. so after about 20 minutes he says "oh yeah my vacuum/boost guage is bouncy at idle", so i immediately shut the hood and said "you chipped an apex seal let's go eat dinner" so it also helps you diagnose engine problems/vacuum leaks. Quote Link to comment Share on other sites More sharing options...
jnjdragracing Posted February 14, 2007 Share Posted February 14, 2007 I agree, we used the combo as well. Lets me know how much vaccum I am pulling. John Quote Link to comment Share on other sites More sharing options...
jerryb Posted February 14, 2007 Author Share Posted February 14, 2007 Thanx for your comments...very helpful!! A combo gauge it is!!! Quote Link to comment Share on other sites More sharing options...
eec564 Posted February 14, 2007 Share Posted February 14, 2007 Manifold pressure is an excelent tuning and diagnostic tool. You can see if your engine is out of adjustment by seeing how smooth a vaccum it pulls, among many other things. The thing I like about having one is for tuning at cruise speed. Tuning your car to cruise with a high vaccum can result in significant milage increases. It's cheaper then a wide-band, and doubles as your boost gauge too! Quote Link to comment Share on other sites More sharing options...
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