just want to make sure this should be OK (boost level)

[TurboSedan]

i turned up the boost from 11-12psi to 13-14psi. MBC grainger valve. it briefly spikes to 15psi (very briefly) then holds 14psi but closer to redline it goes down to 13.5psi or so. 100% stock fuel system. it is not high enough that it hits cut out. stock cal, no ziener diode or anything like that. stock turbo and intercooler too. i am at 4500ft elevation and it's COLD out too. 91 octane gas because that is our "premium"; the highest available here due to our elevation.

i haven't checked plugs yet but i will tomorrow morning. only real mods are full 3" mandrel bent FWDP exhaust and forged JEs FWIW. also has a K&N panel filter, Magnecor KV-85 wires, a vacuum distribution block for MAP, FPR, boost gauge (electronic Autometer) and TiAL BOV. the MBC is sourced from the nipple on the compressor outlet.

so should i be "ok" with 13-14psi on a stock fuel system or should i be using +20s and AFPR? it's only 2-3psi over stock so i figured it should be fine. a new Walbro 255 is going in very soon. i don't have WB02 yet. i cannot hear any audible detonation but i know i can have detonation without actually hearing it. pulls like crazy and seems to run very smooth. i am going to replace the plugs and then check them after "getting on it" a few times tomorrow morning.

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Joshua Mitchell
2000 Audi A6 Quattro - 2.7T/6-speed, 100% stock
1998 Buick Regal GS - S/C Series II L67/4T65-E HD, trade pending!
1991 Dodge SPiRiT R/T - TIII/A-568, 3" FWDP exhaust, MBC @14psi
1987 Shelby CSX #667 - TII/A-520, sale pending!

[CaptMoe]

I thought 16psi was the max on stock cal but I could be wrong.

I've got my MBC set at 14 now as well but I've got an ND cal in mine...

[Murphy]

14.7 should be max on the stock cal

[jl93sundance]

14.7 should be max on the stock cal


It will be on a stock cal, overboost is a 14.7, thats all the 2-bar map can read

[GLHNSLHT2]

if you want to know if your safe get a wideband O2 and make sure you have enough fuel. I'd be worried as the T3's run the injectors wideopen stock.

[TurboSedan]

today i am taking the MBC out and running a straight vacuum line. 6psi is all i need in the winter anyway, not to mention i really need to upgrade alot of other stuff before running higher boost.....suspension/brakes, not to mention fuel system and WB02.

it sure was fun though! it was alot faster than i thought it would be at 14psi.

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Joshua Mitchell
2000 Audi A6 Quattro - 2.7T/6-speed, 100% stock
1998 Buick Regal GS - S/C Series II L67/4T65-E HD, trade pending!
1991 Dodge SPiRiT R/T - TIII/A-568, 3" FWDP exhaust, MBC @14psi
1987 Shelby CSX #667 - TII/A-520, sale pending!

[CaptMoe]

I drove my car for the first time in a few weeks and I have to say it scared me when the boost came on...:bolt:

Never mind what it did to the guy in the VW Golf who was trying to pass me...:D

[TurboSedan]

wow 6psi is boring!!!! haha, well, it IS much more driveable now on the snowy/icy roads.

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Joshua Mitchell
2000 Audi A6 Quattro - 2.7T/6-speed, 100% stock
1998 Buick Regal GS - 3800 S/C Series-II/4T65-E HD
1991 Dodge SPiRiT R/T - TIII/A-568, 3" FWDP exhaust
1987 Shelby CSX #667 - TII/A-520, sale pending