downsides of raising boost level?

[Onnipotente]

on a stock tsi or gst... well with a boost controller... what are the downfalls to upping the boost level to 15psi?

harm turbo...engine? decrease engine life? what exactly?

 

[Bohrn]

too much boost = more heat = more knock = less timing = less power. Excessive, long term knock can lead to engine failure tho, keep that in mind. The actual noise that knock produces is the early compression ignition flame front colliding with the spark plug flame front. Also if the early, non planned for ignition happens when the piston is travelling upwards, the piston will have some downwards force applied to it when the rest of the engine is attempting to raise it to top dead center. Not really a good occurrance. If I'm missing something here, someone else will correct it, Im sure.

Raise octane of fuel, raise availiable fuel(pump and injectors), lower intake charge temp(intercooler) and then you can up boost.

I see that you are a N/T driver so I am assuming that you are thinking of getting a turbo? Good choice

I can't speak for a 2g turbo, but with a 1g, if you have good pump gas(94 octane) and you rewire your fuel pump, you should be able to run 16 psi quite effectively.

 

[RipperXX]

I run 15psi daily.. I know I am geting some knock past 5,000rpm (no logger I can just feel the timeing get pulled real quick) But I have a hacked MAF, so thats probly why.

(got to put that comb back in there some time)

 

[kgt_rdr]

more boost = more power = much more heat (otherwise stock engine). like has been said before, this will lead to knock, and pulled timing...which in turn will mean less power. i wouln't get a boost controller until you get some supporting mods, but thats just my opinion.

 

[Bohrn]

first thing anyone should do after ALL the maintainance stuff is an aftermarket boost guage.

Then free mods, then if you can afford it, full exhaust, then boost controller, fuel pump.

 

[Focusonme13]

i always see this posted, and been searching how to do it..and wat it does....but cant find nething....wat does the fuel pump rewire do?...and wat r u doing when u do it?

 

[TSi999]

it wears your your turbo faster.

 

[Enigma_Man]

Originally posted by TSi999
it wears your your turbo faster.

Not necessarily. Some turbos actually spin slower (and therefore wear less) at a higher pressure, but that's splitting hairs and since we're talking about stock stuff, untrue, but I figured I'd throw it in there, for some added thinking-stuff-abouty.

15 psi is right on the verge of possibly being bad. On my 1G, with its mods, and its current state of maintained-ness, 15 psi isn't a possibility. I'd knock way too much.

Some people can run 16 psi stock, some can only run 13. YMMV

-Jesse

 

[Defiant]

Originally posted by Onnipotente
on a stock tsi or gst... well with a boost controller... what are the downfalls to upping the boost level to 15psi?

harm turbo...engine? decrease engine life? what exactly?

I think it's safe to say that 15 psi is a generally accepted "safe" level of boost for a DSM. That said, more load is more wear is more heat is less safety margin. Worse, once you feel more power, it's the VERY rare driver who doesn't USE more power.

 

[RipperXX]

Very true ^^

Take one of my friends for instance, he had his V6 in his 300XZ NA rebuilt very tight and before it was even close to broke in he was raceing ppl up to 130mph and doing stupid shit.. Im fankly suprised he hasn't damaged the engine


I tend to normaly stay under 7psi just minding my own buisness driveing daily.. but every now and then you get that itch in 1-3rd gear...

 

[DSMkid311]

Originally posted by Bohrn
first thing anyone should do after ALL the maintainance stuff is an aftermarket boost guage.

Then free mods, then if you can afford it, full exhaust, then boost controller, fuel pump.

anyone have a list of these "free" mods. i assume it has something to do with cutting up the filter box and removing the silencer cone but what else is there?