Boost increase from stock
- Thread starter d_ragon78
- Start date
RevLimitLaunch
Member
- :
- 06 MS6/03.5 MSP
boost controller.
jcgemt2003
Member
- :
- 06 speed6
dont bother...its not worth it till you can tune...fuel cutoff is at18psi...thats 1.5more lbs of boost...you wont feel any difference.
RevLimitLaunch
Member
- :
- 06 MS6/03.5 MSP
15.6...if fuel cut is at 18, you got 2.4 to go lol, but not worth it at all. save yourself and save the 9.5:1 comp all aluminum motor that mazda probably won't warrant if/when they know the boost went up.
freekwonder
Contributor
- :
- Datsun 510/Nissan Frontier
None of them came with Factory boost gauges. Do a search on boost gauge in the Mazda 6 section. There are quite a few thread about them and a lot of different gauges and styles used.
DSMConvert
AWD...say Bye Bye
- :
- Titanium MS6
The fuel cut issue is a fairly easy problem to overcome. This was a prevalent problem on DSMs and was solved by running an air/fuel controller(AFC) and larger injectors. THe ms6 uses a disi system as opposed to a disi system, but it still works in the same way. First let me exlain how a system normally works and then I'll explain how the fix works. Ok in a stock system the ecu knows a few things about the air coming in, more specifically it knows the air count from the maf sensor and it knows the injector size(obviously it knows lots of things but these are the only things we need to be concerned with in thsi situation). To determine how much fuel it should use at a given rpm/boost level it simply checks its air count input and then references a predetermined fuel map to determine how long it should pulse the injectors. Since it knows the size of the injectors it always knows that a given pulse width will deliver a specific amount of fuel. So to eliminate/raise the fuel cut level you use the afc to lower the air count value the ecu sees, thus making it happy. Now obviously if you only do this you'll be running lean, b/c the ecu is only going to deliver the fuel according to the air counts it receives. So to balance the system again, you install bigger injectors. This works b/c the ecu still thinks it is using the stock injectors. So though its assures itself the fuel delivery is the same b/c the pulse width is the same, it is actually delivering more fuel b/c the larger injectors allow for more fuel to pass at the same pulse width compared to the stock injectors. Ok now an example to clarify:
Say we want to run a boost level that requires dialing down the air counts by 10% to keep the ecu from being unhappy. Well now the ecu is thinking there is 10% less air and thus delivers 10% less fuel, even though the real air count is higher. To keep the engine from running lean and balance the system again you'll need injectors that are 10% bigger to match the percentage of air count change. So what you end up with is a happy ecu that thinks you're still running stock and a happy motor that still has the correct amount of fuel.
DISCLAIMER: fuel ratios according to air counts are not linear functions, I merely made it appear so to keep the example simple. In actuality a 10% reduction in air counts will be a ranged % value for fuel depending on load and rpm.
Ok to clarify the fuel cut is triggered by an aircount associated with a boost level, not an actual boost level(though the ecu does have the ability to know boost pressures at all time and is an entirely different discussion). It can do this b/c it was programmed to know that a given input value from the maf is tied to a specific boost level produced by the stock turbo.
As far as fuel injectors go currently there isn't a company specifically producing the needed injectors to make this work, though 2 companies Delphi and Bosch do offer variable flow/variable pressure DISI injectors on a custom application basis.
Ok this is fairly long and I'm sure I missed something, so if anyone finds an ommission or issue just let me know and I'll edit as necessary.
Say we want to run a boost level that requires dialing down the air counts by 10% to keep the ecu from being unhappy. Well now the ecu is thinking there is 10% less air and thus delivers 10% less fuel, even though the real air count is higher. To keep the engine from running lean and balance the system again you'll need injectors that are 10% bigger to match the percentage of air count change. So what you end up with is a happy ecu that thinks you're still running stock and a happy motor that still has the correct amount of fuel.
DISCLAIMER: fuel ratios according to air counts are not linear functions, I merely made it appear so to keep the example simple. In actuality a 10% reduction in air counts will be a ranged % value for fuel depending on load and rpm.
Ok to clarify the fuel cut is triggered by an aircount associated with a boost level, not an actual boost level(though the ecu does have the ability to know boost pressures at all time and is an entirely different discussion). It can do this b/c it was programmed to know that a given input value from the maf is tied to a specific boost level produced by the stock turbo.
As far as fuel injectors go currently there isn't a company specifically producing the needed injectors to make this work, though 2 companies Delphi and Bosch do offer variable flow/variable pressure DISI injectors on a custom application basis.
Ok this is fairly long and I'm sure I missed something, so if anyone finds an ommission or issue just let me know and I'll edit as necessary.
Last edited:
Antoine
Administrator
Some posts have been removed due to vendor bashing. Please note the following site rule:
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Let's keep this thread on track and help d_ragon78 with his question. Thanks!
9. Vendor and merchant disputes from customers must be handled privately. Negative reviews for vendors can only be posted after (a) direct communication to the vendor has failed, and (b) you have contacted a forum administrator or super moderator explaining the situation and have gained permission to post a negative review. Personal attacks towards a merchant or vendor authorized to do business on the forums is strictly prohibited. Mazda Forums has a zero tolerance policy towards unwarranted attacks on vendors and merchants (users with the title "Authorized Vendor" or "Authorized Merchant Member" under their username). They are the "lifeline" of the Mazda aftermarket. Making unwarranted attacks, or negative reviews without proper permission, against vendors or merchants can result in an immediate and permanent ban without warning.
Let's keep this thread on track and help d_ragon78 with his question. Thanks!
Anon Y Mous
Banned
Antoine said:
sig heil hitler. Don't you mean that vendors are the life blood of your advertising income from this forum? Wouldn't that be a more fair response?
