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Old 09-07-2002, 09:59 PM   #1
The Ru
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Default Partial Throttle Boost/EGT--- whats bad?

I been reading bout everybody having issues with partial throttle with an MBC. On top of all that, i still have a question. If at partial throttle boost goes up higher than it should(say 12 psi or so), but the egt's are not that high.....is that okay? I mean or is it still running lean, and possibly dangerouisly? Or would the egt gauge still tell me when its getting dangerous by the Temp.

If that was in anyway unclear, please yell at me.

TIA

ian
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Old 09-08-2002, 09:26 AM   #2
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well if it boost thats fine egt well you'll get some high readings sometimes i'd say thats a bit worst. boost is only going to burn more gas (more trips to the gas station ) but i've had mine on for a while and i get roughly 23 mpg now cause i know how to drive it .....took me two weeks and a long trip to get it down but i got it now.
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Old 09-08-2002, 10:52 AM   #3
The Ru
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So its okay for boost to creep up during partial throttle as long as the egt's dont?

ian
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Old 09-08-2002, 11:22 AM   #4
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Ian, just drive your car dude...Stop worrying, before you shed 10 years off your life over part throttle egts....
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Old 09-08-2002, 11:45 AM   #5
The Ru
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New IP- i know, i was actually more wondering than worrying. i just read all these threads and somtimes its tough to get a good final answer on stuff. i wasn't sure whats "right", and supposed to go on.

ian
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Old 09-08-2002, 12:22 PM   #6
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Quote:
Originally posted by The Ru
New IP- i know, i was actually more wondering than worrying. i just read all these threads and somtimes its tough to get a good final answer on stuff. i wasn't sure whats "right", and supposed to go on.

ian
You won't get a final answer in this forum, unfortunately. Some say that PTFB is bad in all forms, others say that as long as you get PTFB but your EGTs are reasonable, that's alright. Some say that MBCs are Satan, others say that they're a great bang for the buck performance mod, as long as you don't go too far.

That's the beauty (and curse, unfortunately) of a place with a lot of opinions, theories and practices. No real, definitive answers will be forthcoming.

Ain't it cool?

Kevin
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Old 09-08-2002, 03:13 PM   #7
thejean
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Here's my take on PTFB and I've researched it to death along with cheap ways to get around it...

It "could" be bad depending on your driving style and where you have your MBC set to. I've heard of people running +1600F EGT's for long periods of time with 0 problems. I've also heard of people (i.e., WRXGuyinTulsa) who melted his cat by running an MBC full-time at 17 psi. Am I going to take a chance with it on a $25K car - no way. On the other hand, if I had a cat-less up-pipe I'd have an MBC for sure... After all, people don't seem to report overly high IAT's with MBC's or pulled timing (i.e., no detonation). So as long as you turf the cat in the up-pipe you should be fine with an MBC. As an added bonus, removing the cat in the up-pipe alone has been dyno proven to produce 10 HP. So, why not kill two birds with one stone?

What I plan to do....
1. Gut the cat in the stock up-pipe. COst = free.
2. pull the hose going to the FBC. cost = free.

This will allow you to hold 0.11 MPa to redline easily and safely and spool-up will be similar to an MBC.

JC

EDIT: FWIW, I think that in stock form EGT's won;t really go above 1450F.
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Old 09-08-2002, 03:18 PM   #8
The Ru
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Ya see, now i up/downpipes with turbo back exahust. My EGT's never break 1500ish. i mean my high would be like 1525, so i dont thikn i have a problem. i was just wondering if we as a board were coming closer to a definitve answer....lol

ian
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Old 09-08-2002, 03:30 PM   #9
thejean
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Quote:
Originally posted by The Ru
Ya see, now i up/downpipes with turbo back exahust. My EGT's never break 1500ish. i mean my high would be like 1525, so i dont thikn i have a problem. i was just wondering if we as a board were coming closer to a definitve answer....lol

ian
The longer people run with them the closer we will be. I would like to see a Delta Dash log of a run at part-throttle on an otherwise stock WRX...

That would tell a lot...

JC
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