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Advice on Boost Controllers

Jho0001

By Jho0001,
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Weihui

Weihui

Clutched

Indeed, my SGD 150 (inclusive of installation) Turbosmart Manual boost controller works pretty darn well and relatively easy to tune. Aside from the fact that I have to tune it under hood where EBC offers in-cabin tuning. But once tuned, you can feel the MBC performs like your stock T-joint (where the MBC replaced) with almost hassle-free. [thumbsup]

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Slowpoke156

Slowpoke156

Neutral Newbie

Your explanation for "just about right" size of turbos is not quite right. It's more appropriate to say stock factory turbo or small turbo. On large turbos, you can hold max boost from the time it sets in all the way to the redline. That's what most people who upgrade their turbos want anyway, otherwise no point.

 

You can have multiple stepped boost control based on rpm, even with the use of multiple MBCs. You just need to know how to wire them up using a separate controller.

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Andrewkb

Andrewkb

Neutral Newbie

Well, as long as the turbo doesn't spool to above "0 bar", that zone is considered as turbo lag, whether we can feel it or not right, since it's still considered NA.

 

So rightfully, anything above "0 bar" is boosted ?

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Elfenstar

Elfenstar

3rd Gear
(edited)
Your explanation for "just about right" size of turbos is not quite right. It's more appropriate to say stock factory turbo or small turbo. On large turbos, you can hold max boost from the time it sets in all the way to the redline. That's what most people who upgrade their turbos want anyway, otherwise no point.

 

You can have multiple stepped boost control based on rpm, even with the use of multiple MBCs. You just need to know how to wire them up using a separate controller.

 

ACtually your turbo choice should depend on what you want out of your car... generally smaller turbo = more response, bigger turbo = more high end power.

 

Also ball bearing turbos spool up faster than normal roller bearing turbos. Then there is the size of the turbines for both front and back. bigger exhaust = slower spool up but higer top end, while bigger intake = faster spool up and higher top end, but then the front and rears have to be balanced in size (i.e. one side cannot be too big). Then there are the twin scroll designs which have a valve to open/close one of the ports that leads to the exhaust turbine...

 

As for rev controlled boost level, only a few EBC's offer them for first gear only to reduce the lieklyhood of wheel spin. There is no way to do it with a MBC. Thats coz MBC's basically bleed air out and work on boost pressure and not anything else.

Edited by Elfenstar
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Jho0001

Jho0001

Neutral Newbie
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Just to add, if you ever overboost, you may stall the compressor in the turbo or cause it to overspin. Not a good condition to be in.

 

What do you do in such a situation?

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Elfenstar

Elfenstar

3rd Gear

when he says stall he means seize (i.e. fuses to something so it cant move) and the result of prolonged overspinning is that the exhaust turbine flies off (best way to remove ur cat [laugh] ) either way once one of these happens, its time for a new turbo.

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Jho0001

Jho0001

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when he says stall he means seize (i.e. fuses to something so it cant move) and the result of prolonged overspinning is that the exhaust turbine flies off (best way to remove ur cat ) either way once one of these happens, its time for a new turbo.

 

 

But if the I'm running stock turbo/ECU wouldnt to ECU boost cut safety feature prevent this from happening? [crazy]

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Elfenstar

Elfenstar

3rd Gear

yup it will but then there are fuel/boost cut defenders etc to get rid of that. not to mention aftermarket ecu's chips which disable or don't have them.

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Jho0001

Jho0001

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So far my credit card is taking a good hammering....

 

N1 Evo installed - has a very nice rumble but noise takes some getting used after using the stock muffler, unfortunately I feel as though I have lost low end, which I expected...more than I thought though :(

 

Fuel regulator - installed but dont know whether makes any different, believe it is supposed to improve response?

 

Turbo boost gauge installed - I find this useful.

 

Boost Controller - installing next week.

 

Hopefully the boost controller will recover and improve my low end since I'm buy the controller which allows me to set boost according to RPM e.g low RPM, high boost (I think this is how it works)?

 

Mechanic suggest I fit a CAI (mushroom type) but I believe this will make my low end worse?

 

Suggestions?

 

Thanks

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Elfenstar

Elfenstar

3rd Gear

your low end shouldnt be affected. In TC cars, the backpressure isnt affected by the exhaust because the exhaut turbine is the most restrictive section of the exhaust system. There should be negligible difference in low down power, but more up top.

 

fuel regs are actually meant to bump up the pressure in the fuel rail (more than stock) so the injectors can "pump" more fuel than they would normally be able to. Unless the person that installed the fuel reg set the base pressure (varies from manufacturere to manufacturere) and rising rate (usually 1:1) the same as stock, you will feel a difference in power.

 

A cai and pod will lower the low down torque a tiny bit, but hey it makes a damn shiok sound when spooling up [laugh]. I would suggest the apexi power intake as its got the best filtration of the lot and airflow is still really good.

 

Can i suggest you get a Power FC and tune while you're at it, or at least a tune coz the fuel reg can muck things up.

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Jho0001

Jho0001

Neutral Newbie
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Low end loss could be phycological as there more noise during pickup whereas previously it was a quiet pickup.

 

Hmmmm....fuel regulator could be still at stock level as I have yet to have the boost controller installed, believe they will tune once this has been fitted?

 

Think I will give th CAI a miss if it is not going to help with low end acceleration, the exhaust note on it's own sound nice enough [dizzy]

 

Thankd for all your advise, it has been very helpful.

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Elfenstar

Elfenstar

3rd Gear

righto. Try and get a proper full tune eh... that would make the car run even better than with just a boost controller and/or fuel reg tune.

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Jho0001

Jho0001

Neutral Newbie
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Was just told thay I may not be able to set boost below 3k rpm, is this correct? even with at RPM based boost controller?

 

Where is the best place to get a good tune and reasonability priced or should I say how much should I expect to pay....all ready broke...sigh.

 

Cheers

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