Max safe boost? [Merged 10-6]

[Turbolaser]

Is it safe to do the boost contol solenoid mod on a stock 1G?

 

[Absit]

i dont have stock turbo ill have a big 16g. and 550 injectors dont need tune.

Even if they work ok, a tune would not only increase your power, but your fuel economy and parts life as well. Not to mention if you can't log, you can't turn up your boost.
If you don't have wideband, you can't turn up your boost.

Well, you can.. You can do anything once.

Road Race Engineering's Eclipse Fuel Delivery Upgrades
RRE says you can run 17 to 18 PSI, but again, without logging and wideband it's a terrible idea.

 

[ilco187]

550's do need a tune. you will foul your plugs from running rich and boost has nothing to do with how this works.

 

[Dsmkauai]

Oh update your profile then. But you do need a tune with 550's even would help stock. You will run rich at idle and cruise, and you need to be able to change your deadtime and global fuel settings. The ecu needs to know the changes your making or things just don't run as efficient. But do as you will

 

[dsm03]

i dont have stock turbo ill have a big 16g. and 550 injectors dont need tune.

Im not sure Im getting this,

You have upgraded injectors and you don't think you need a tune or you have a tuning device already?

 

[motozachl]

AFTER a tune.....about 21-25lbs for that turbo

 

[TsiJohn333]

hey everyone. I am currently building my girlfriends 1998 eclipse gst spyder (automatic). i just purchased an evo III 16g turbo, 550cc injectors walbro 255 fuel pump, apexi safc II, evoscan and an aeromotive fuel pressure regulator.
i already installed a big frountmount intercooler with all the hard piping, greddy type s bov, coil on plugs, turboxs mbc, 2.5 inch apexi n1 turbo back exhaust system with a cat delete, tubular exhaust manifold, injen intake, autometer boost and oil pressure gauges, and an aem uego wideband. i plan installing everything over the weekend and tuning it as well.
Now my question is how much boost would it be safe to run on 550cc injectors? I've heard numerous answers but don't know the right one. If someone could please help me out i would greatly appreciate it. Thanks!

 

[91stocker]

550cc @ 100% IDC will support 39.48lbs/min
550cc @ 80% IDC will support 31.58lbs/min

You should be able to max those injectors fairly easy. Just slowly turn up the boost and watch your logs and afr's. Every car is different. There wont be a set psi limit.

Most people dont like to run much over 80% idc. Its gives you some leeway.

 

[LiquidX]

550cc @ 100% IDC will support 39.48lbs/min
550cc @ 80% IDC will support 31.58lbs/min

You should be able to max those injectors fairly easy. Just slowly turn up the boost and watch your logs and afr's. Every car is different. There wont be a set psi limit.

Most people dont like to run much over 80% idc. Its gives you some leeway.

Pretty much summed it up right there. PSI is just a number, it's relation to air flow is not relevent between turbos.

But to answer you ideally do not want to go above 80% IDC (100% is no longer pulsing) and you want to monitor your timing pull/knock. Those will be needing the use of a logger to figure out.

 

[TsiJohn333]

Ok, so maybe if I went bigger injectors like 650s instead of maxing out the 550s, maybe this would give me a little bit more room to work with? So I'm not running the 550s at 100% compared to 650cc probably being at 70% to 80%? Does evoscan monitor timing pull/knock? Sorry for all the questions.

 

[dsm03]

Ok, so maybe if I went bigger injectors like 650s instead of maxing out the 550s, maybe this would give me a little bit more room to work with? So I'm not running the 550s at 100% compared to 650cc probably being at 70% to 80%? Does evoscan monitor timing pull/knock? Sorry for all the questions.

Precisely.

Keep in mind, most will go with the biggest injectors you can find for future mods and upgrades so it is one less thing to upgrade down the road, if that is in your future plans. Although, seeing as how you are tuning with a AFC your max injector size you can go with is 650s.. unless you upgrade your tuning device to dsm/ecm link..

 

[Absit]

Does evoscan monitor timing pull/knock? Sorry for all the questions.

EvoScan can monitor absolutely anything your ECU puts out via OBD or MUT.

 

[TsiJohn333]

Thanks guys! I didn't know that 650cc injectors is the biggest you can go on a safc II. Also one more question, when i install my afpr should i set it for a base line of 43.5psi with a walbro 255 fuel pump?

 

[Absit]

Unless you have a reason to set it otherwise..factory tends to work well.

 

[TsiJohn333]

Ok cool! Thank you guys for all your help!

 

[LiquidX]

Well the fuel pressure needs set to factory level until you have the ability to tell the ECU hat you have a different fuel pressure. Changing it willthrow off you trims unless the ECU knows otherwise. Most people will keep the fuel pressure at the stock level regardless if they have a way to tell the ECU to use a different pressure.

So depending in your actual goals for the vehicle, you may be better off ditching the SAFC and going with a better way to tune. I had a 16g for a while but knew I would be going with a larger turbo so when I got ECMLink I ordered 1250cc injectors to run with.

 

[STLskater92]

Go with the biggest injectors you can find. I have 550cc's and with a big 18g I fuel cut at 24psi. And I do have a 255 fuel pump set up properly. On days where the air is denser i've fuel cut as low as 20psi. It's all about amount of air more so than pressure of the air.

 

[91stocker]

Go with the biggest injectors you can find.

He cant really since hes on a safc. 650's would give you alot more room to work with and is about the max you can run on safc.

650cc @ 100% IDC will support 46.66lbs/min
650cc @ 80% IDC will support 37.32lbs/min

Those would be very nice numbers on a 16g.

But like liquidx said, what are your goals? You may want to upgrade your tuning to maybe link or ostrich and tunerpro. Then you can basically run the biggest injectors you can find and have plenty of room to grow for when that 16g is just too small haha.

 

[ziggo0]

He cant really since hes on a safc. 650's would give you alot more room to work with and is about the max you can run on safc.

650cc @ 100% IDC will support 46.66lbs/min
650cc @ 80% IDC will support 37.32lbs/min

Those would be very nice numbers on a 16g.

But like liquidx said, what are your goals? You may want to upgrade your tuning to maybe link or ostrich and tunerpro. Then you can basically run the biggest injectors you can find and have plenty of room to grow for when that 16g is just too small haha.

That's about what I see with my 550s with fuel pressure high enough to make them flow like 650s.

 

[JayB12]

Nevermind. Haha.

 

[DROPthatCLUTCH]

So i found 2 cracks in my exhaust manifold today, aswell as, a crack in my 14b.
Also found out that it's my turbo that been burning my oil lately.
Buuuuut.. It's all good! because, it's my excuse to buy a evo III big 16g, and some headers.

How much boost you guys pushing on this turbo?

 

[red92tsi]

I had an Evo III on my last car and had it set at 21psi.

 

[broken_eclipse]

30psi, and yes thats way out of its efficiency...hence the current setup.

 

[MichaelSuch]

16g's really don't wake up until around 16-18psi. I wouldn't run any less than 18 if it were me.

 

[tips000]

im only hitting about 12 and it pulls harder than rudolf!

 

[DROPthatCLUTCH]

im only hitting about 12 and it pulls harder than rudolf!

I litterally just ed.

But seriously!? That much boost?
I was thinking, more like 15?