More boost than stock?

[MarcB]

Quick question about the stock boost on a 2g dsm. I have a 98 Talon TSI AWD that i bought bone stock with 98,000 km's on it, since then iv have put 10,000 km's on it, an injen intake, HKS hi-power catback, a "fake" type S BOV with an jmf fab adapter and had the timing belt, and all the front seals done. I have now just put a boost gauge in and its reading 15-17 psi of boost (sometimes it will go to 14 psi) the stock boost is supposed to be around 11-12 psi i think? I Don't have a boost controller in yet, Iv checked for vacuum leaks/boost leaks the best I could. Just wondering why it would be running higher than stock, and possibly a way to fix it? Thanks!

 

[randman2011]

To my knowledge stock boost was between 12 and 15 psi. I believe the 1gs were 11-12 and the 2gs were a little higher. Wastegate pressure on my old turbo was right at 15 psi. You still have the stock T25 and are using the factory boost control solenoid? Have you done the BCS restrictor delete?

 

[1G Eclipse94928]

If your not experiencing any side effects its probably perfect, I would get ecmlink next

 

[MarcB]

It's still the stock BCS, just dont want to run it too lean and wreak something as it's my daily driver If i did get a MBC it wouldent be a good idea to run any higher right? (with stock injectors, fuel pump etc.)

 

[randman2011]

I wouldn't go higher, no. According to DSMLink on my old 6 bolt with a big 16g, my fuel injectors were maxed out at wastegate pressure at just over 5k RPM. Since the boost gauge the previous owner installed was purely for aesthetics, I have no idea what the boost actually was, but I am assuming that it was less than the 15 psi that it was reading.

I agree with MarcB. Get bigger injectors, probably 650ccs just to be safe. I have 550cc and am at 85% duty cycle at wastegate pressure (15psi) on my T28. So bigger injectors, the fuel pump rewire if you haven't already (no really, it makes a huge difference) and some form of tuning. I couldn't be happier with ECMLink, but there are other options out there, especially if you already have the black top ECU.

 

[92GVR4SC]

put a good boost gauge in the car, and a decent manual boost bleed valve. With stock injectors, fuel pump, ect. you need to stay around stock boost levels, or face detonation and burnt pistons.

 

[68GTOblues]

I agree w/ 92GVR4SC as far as enhancement within stock parameters rather than full tilt crazy (not that there's anything wrong with that ). Are you referring to the Man boost bleed valve for $75, the one with the detents? Also I'm still a bit in the dark as far as splicing into the right lines for the boost gage and bleed valve, please? Thank you.

 

[ThunderChild]

I believe he means boost bleed valve to be BOV. A good 1g bov should hold around 20psi. upgrades can hold more pressure, react faster and bypass/vent more air. Just depends on your level of need.

Generally, bov should be independently tapped at the intake manifold, and the boost gauge can use a "T" into the FPR vac/boost line.

 

[68GTOblues]

As a newbie to turbos, I'm still confused & apology if I don't use the right buzzword. Are we controlling boost at the waste gate or BOV or both? I'm looking for some specific answers of parts & plumbing, please. The goal is just to enhance what I have and run the safest amount of max boost as a daily driver, please. Thanks for your help.

 

[ThunderChild]

The waste gate is regulating max possible boost, in conjunction with whatever boost controller you run, given everything working correctly and sized appropriately.

Boost controllers can be manual or electronic, possibly other kinds, and are a way to regulate the amount of boost the waste gate references to modulate max boost pressure.

BOV's or BPV's are a way to vent or bypass excess boost pressure present in the tract, out of said tract, after the throttle body has closed. This helps prevent damage to the throttle plate, the turbo compressor wheel and turbine shaft.

The BOV/BPV is usually located on the intercooler piping, between the compressor outlet and throttle body, usually close to the throttle body. A BOV will vent to atmosphere usually, a BPV will redirect boost pressure to turbo inlet after the maf.
A BOV is generally used on a speed-density system (no maf), and a BPV is generally used with a maf system.

 

[68GTOblues]

Thanks for the 101. Is there a way to "enhance" boost on the lower end of my cash reserve?

 

[ThunderChild]

If you're completely stock, a boost controller will allow you to increase boost pressure some.

What all does your car have? Filling out your profile with current parts/mods will help in the future so others see what you have on the car and make suggestions.

 

[68GTOblues]

1) I have edited my profile car is stock, 'cept for a K&N. Thanks.
2) Suppose I should figure how much boost I really have. What's good max boost value for daily driver?
3) FPR = fuel pressure regulator? Is there a list on this site? ("Acronyms for $2000 Alex")

 

[doubleclutch]

1) I have edited my profile car is stock, 'cept for a K&N. Thanks.
2) Suppose I should figure how much boost I really have. What's good max boost value for daily driver?
3) FPR = fuel pressure regulator? Is there a list on this site? ("Acronyms for $2000 Alex")

You really shouldn't turn the boost up without any fuel modifications. The stock injectors can hardly keep the injector duty cycles at a reasonable level at 15 psi. Thankfully your stock turbo (t-25) can't hold 15 psi to redline. You could "turn up" your boost to 15psi if you weren't there already if you acquire a way to measure your boost pressure. You should check out the "free mods" under the resources tab. or here: http://www.dsmtuners.com/threads/basic-horsepower-ugrades-2g-4g63t.480196/

No acronym list, if you read in context usually they aren't hard to figure out. FPR could be fuel pressure regulator or a forced performance red turbo depending on context.

 

[68GTOblues]

"Double Clutch" - good stuff. So now I know what the engine is capable of.

I must take some time on that link you sent as well - just what I needed.

I know this sounds corny, but I'm thankful for the people on this website.

 

[1990TSIAWDTALON]

You are asking the right questions and LISTENING to those that are trying to help so just keep it up. All of the members here are more than happy to try to help out. If you have different problems, do a search and if nothing comes up, then start a new thread so we can work on things one at a time not all together. WELCOME!!!!

 

[1990TSIAWDTALON]

This should be helpful to all new comers and those well versed the same, a list of common acronyms:

http://www.dsmtuners.com/threads/dsm-acronyms.507033/#post-153614765