How much boost to run?

[gusu]

I have the stock 1g maf, stock injectors, and I'm about to install my wally 190.

When I looked around I couldn't find anything to specific to my needs.

I would like to push my 14b with out risking it. I heard the injectors can do up to 18 PSI but that seems like a bit much.

I guess I'll have to reinstall the software to use my palm again too

 

[92AWDHX40]

Boost, do you have a wideband? A must for turning up the boost, or youll be needing another engine.

 

[210 dsm]

yeah the injectors might be good till 18 but other things will stop u b4 u hit 18. with what seems to be stock fuel and ignition parts u shouldn't go passed 10-11psi. for the sake of your engine do some other mods before turning up the boost. haha i know it could be tempting ,but don't do it. you'll regret it.

 

[TSi Kid]

14lbs is safe if you have a boost controller and a AM boost gauge.

 

[Ghost1984]

Yeah I agree make sure you have a wideband and a logger to keep tabs on everything if you decide to turn the boost up, but until than i wouldnt go higher than stock boost levels.

 

[TSi Kid]

If you have a stock setup why would you need a wide band?

 

[gusu]

Yes, I do have a AEM wideband and a palm datalogger. I have been running 15 psi with no knock or anything unusual showing up on my wideband. I wasn't sure if the vfaq was correct on their chart but it was showing 18 is doable on stock injectors and a pump but 20-22 requires 550s. What should I be looking for? Just extra heat from running the turbo just barely out of it's efficiency range? If so I also have a 2g manifold and edt I never installed.

 

[TSi Kid]

I run 18 with stock injectors and walbro 255 w/o hitting fuel cut.

 

[Absit]

If you have a stock setup why would you need a wide band?

If you ever plan to modify anything ever, you need a wideband.

 

[gusu]

I run 18 with stock injectors and walbro 255 w/o hitting fuel cut.

Do you notice much of a difference from 18? I noticed a HUGE difference from 10 to 15 psi. I would imagine it would be blowing a great deal more hot air than at my current boost level. Also do you have a FMIC because I would imagine that would also play a big role in performance with the added temp of air. I still have the side mount myself but plan on upgrading to a punishment kit come tax time.

 

[nightmares GS-T]

yeah the injectors might be good till 18 but other things will stop u b4 u hit 18. with what seems to be stock fuel and ignition parts u shouldn't go passed 10-11psi. for the sake of your engine do some other mods before turning up the boost. haha i know it could be tempting ,but don't do it. you'll regret it.

Man the stock ignition has plenty of fire.

 

[LiquidX]

15 psi on stock fuel and stock turbo which you are currently under.

You may not hit fuel cut but your %IDC is above 100% at 18psi which means your injectors are staying open constant and not pulsing. That will lead to trouble. Your ARF will lean out but not in the proper way at all. Turn it back down to 15psi or less until you get larger injectors and a way to tune and log.

Stock ignition doesn't need to be changed at all even for high # HP. It's preferred to upgrade after Xpsi to prevent spark blow out but it's not needed. 25psi on the stock ignition here without issues.

 

[Absit]

What's your AFR look like?

 

[LiquidX]

Absit, the AFR will be leaner but they are lean because the injectors cannot keep up with the demand as they are too small. No pulsing, just a constant stream. You need to tune for a leaner AFR by having larger injectors.

 

[gusu]

Cool thanks for the information.

I was thinking about a 2g MAF soon anyway, I have heard a lot of people say they run 550s to cancel out the effects of the MAF. Now I would assume this is since they have no tuning solution to correct it.

So would I be able to run more boost or only the same boost because it is being used for compensation? The whole idea behind this is a bit confusing to me and I'd be interested in hearing how it actually works out.

I'm looking to do a classic build before moving onto my 16g/750/ECMlink 3 build when I have the money to do so.

Plus I'd LOVE to see what I can push out of my car with out any tuning. I think I'll get it dynoed before the upgrades and take it to the strip here and then again after to see the difference.

 

[92AWDHX40]

Well i guess you will find out in time. You can run th3 560s with the 2g maf but it isnt a drop in and go situation, thats why i skipped the 2g and got the maf cheap, so im waiting on my ecu to get changed to eprom and link on the way.