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Title: What Is Max Boost
Post by: tyson23 on March 17, 2008, 08:20:40 PM

hi
just wondering what is the maximum boost i can go to i have stock twins decat after market air filters powerfc with standard injectors

any ideas just interested
and what is your setup and bhp

Title: What Is Max Boost
Post by: Hayward North on March 17, 2008, 08:27:20 PM

stick to 10psi and reliability :D
Iv been boosting to 12psi for over a year with no probs.

Title: What Is Max Boost
Post by: Timmy on March 17, 2008, 09:06:57 PM

You can goto 1.0 bar around 14psi but you might max your injectors out first, fuel system upgrades maybe required. I think you can get to around 0.9bar on stock injectors.

Title: What Is Max Boost
Post by: shaunwil on March 17, 2008, 09:15:42 PM

Yep, I\'m running about 85% with 1200 secondaries at 1bar of boost. Although the turbos don\'t really last all that long ! got about 2yrs of weekend driving out of mine before they became suspect. Going single to cure this :D

I would say don\'t go above 0.85bar with the stock injectors. Stick to 0.8bar and you should be ok.

Some people do increase the fuel pressure to the injectors to get more out of them but there is an increase chance of failure due to running over recommended pressures. This is done with an after market FPR.

0.9 bar is very much the limit, you ideally don\'t want to go over 80-85% on the injectors before you risk big issues. After early 90% the injectors are running at 100% regardless.

Shaun

Title: What Is Max Boost
Post by: FEED Rocket on March 17, 2008, 11:30:09 PM

I\'m running 0.98bar and its maxing out my injectors big time. Just bought some 1680cc ones and fuel rail, just need a damn pump and regulator!

Title: What Is Max Boost
Post by: michaelb on March 23, 2008, 02:50:17 PM

Hi

I am running 0.94 boost with injector duty up to 92% similar modd, de cat, hks racing suction kit, no air pump, blitz dumb valve, Apexi pfc, greddy pulleys

Having siad that engine detonated due to turbo manifold crack and flap getting stuck thus over boosting = detonation

200 miles on a full re-build, as soon as it reaches 1000 miles I will re map with JaeDay and lower to safer boost

Who knows if it is the higher boost what has damaged the turbo housing...

Regards,
Michaelb

Title: What Is Max Boost
Post by: SiH on March 23, 2008, 09:10:35 PM

I\'m running up to about 0.89 Bar, set by Pip when it was mapped.
However on track the other day i hit 94% injector duty, i think i may have to knock it down a bit.

As for your max boost - i\'d say whatever the guy who is mapping it is happy with ;)

Title: What Is Max Boost
Post by: Jono FD3 on March 23, 2008, 11:06:44 PM

Normaly on twins 0.85 bar is your safe max, but most knock it down to .8 to be on the safe side of cautious!!

Jono

Mazda Rotary Club

General => General Technical => Topic started by: tyson23 on March 17, 2008, 08:20:40 PM