Quote:
Originally Posted by Dean
Huh? WB is essential to tuning. Don't get tuned by anybody who says otherwise. Nothing else tells you what is happening as well in open loop. EGT is a lagging indicator and can lead you down the wrong path to a blown motor.
And in a turbo car, you don't want it in the up-pipe, as the temps are too high. Downpipe is the correct location for a WB.
Oh, and what Scott said.
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I said a wideband gauge isn't a good tuning tool, not a wideband sensor. You need to be reading/logging it through tuning software for it to be useful. EGT lags slightly, buts it's a pretty consistent delay. As for fuel pressure, it's an indicator of potential problems you may not have been able to notice until it's too late, lik eoil pressure. If you have a VF34 on a Walbro, it's probably superfluous. But if you got a setup like Scott's that's on its third or fourth large turbo iteration, it's the only indicator you'll ever have that your fuel pump is not capable and/or goiong out. Story: Vishnu Stage 4 WRX tester made 376 wheel horses on Shiv's (at the time) low-reading dyno. But the funny thing is, the first 20 pulls or so maxed out between 325 and 330. But towards the end of the session, it sudenly started magically climbing. Shiv was rather perplexed. After various investigations, they found that the Walbro was failing, causing the car to get lean after boost. A fuel pressure gauge would have shown this the moment it started to happen. Anyway, fuel pressure isn't super vital, I just htink it's as viable as other fluid temp/pressure gauges.