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Discussion Starter · #1 ·
So I installed my boost gauge today and I never once saw my boost drop. I wasn't pushing my car all the way to redline but I just wanted to know at what rpm's is everyone seeing a drop in boost? My gauge needle bounces up and down a little when at full boost boost but I saw a good 17-18 psi but no drop in the high R's before redline
 

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my boost starts falling around 5-5400rpm. I can hold 16-18psi till redline. I have noticed it depends on the weather because this morning I boosted 24-25psi and was in shock lol
 

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Discussion Starter · #4 ·
Coming right off the turbo I think. My buddy was the one who actually put the vac line on but he tee'd in right at the turbo. My car was boostin a little more this morning also cause it was 35F outside
 

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Discussion Starter · #7 ·
When I was first testing the gauge at WOT I was only doing 2nd gear pulls but I tried a pull in 3rd today and saw it go from 18 to 15 so I guess I'm not really holding boost. But every 2nd gear pull I've done I have not seen a drop. So Since I'm tee'd in right at the turbo im actually at 16.5 and not 18?
 

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If you are connected to a feed line coming right off the turbo then you are seeing what the turbo chargers is producing, which would be the largest boost measurement in the system.
That is based on various things like temperature, engine load and rpm.

If you run through longer gears like 3rd and 4th, you will see the boost taper off as you approach redline. The computer boost control does this.

Once the boost gets to the engine, the amount will be lower from traveling through all the pipes, the intercooler, and throttle body. For the most part, you want to know what boost pressure the engine is actually getting.
 
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