Question about some turbos Post #21

[dsm90gst]

ok yes i have read other threads that were somewhat similar to my question, but i guess i cant still get the answer.

but here goes my question.

Is it bad to put a larger turbo on a stock car (7 bolt), but only running small amount of boost? (15ish psi)

the turbo im talking about specifically would be the "pte 6152e"

the reason i ask this is because, i would like to start of the back with a large turbo, so in the near future i dont have to worry about getting a bigger one. Al i would have to do is to grab supporting mods to boost this baby =D

what can you guys tell me about this plan? good idea or not good idea?
is it harmfull to the motor or anything? Will the small amount of boost even make a difference? Also what kinda hp would you make on that turbo on 15 psi?

lmk

thanks

 

[BLINKY619]

if theres no lag then you should be good... imo.... but dont keep my word... im pretty sure other people here will tell you there opinion...!!!

 

[Aproductions]

It's fine and I see where you come from with the buy it once and buy it right.

low boost is good but you need a external wastegate

 

[flawlessTSI]

thats what i did. i got the turbo first FPhta88 turbo aka 37r and i built everything around it slowly ie. fuel system, intercooler, trany stall. and i did the motor last when i finaly pushed it to its limit and blew it.

and with the bigger turbo i got 30mpg on the interstate because it dident spool up at lower rpm cruising speed like a smaller turbo would and suck down fuel. if that makes since.

 

[dsm90gst]

oh ok i see, well how much power do you think i will make with this that turbo on 15 psi?

lmk

oh and thanks!

 

[BrokenTsi]

I wouldnt consider that turbo all that "big", but I can tell you that it will spool pretty good and make good power. Why would you only run 15psi? Feel free to boost way more even with a stock engine.

 

[tsi1991awd]

I wouldn't see why you couldn't run a larger turbo at low boost. The only thing I would really worry about is the lag but that's to be expected even if you were running higher boost, so....

I say go for it man!

Also, nobody can say how much power you'd make on the turbo. Your profile isn't filled out...and if you have no supporting mods, I wouldn't expect a whole lot more than what you currently have.

 

[dsm90gst]

oh so what psi range would be in the safe zone with the pte 6152e? (on a completely stock motor)
i dont wana blow it

 

[tsi1991awd]

Stock internals are overbuilt...they can handle 400+hp.

If you have no supporting mods, you won't be boosting much because you'll just hit fuel cut.

 

[dsm90gst]

so lets say, stock motor with bigger fuel injectors.
what would be the maximum SAFE psi? on stock internals. i know it can handle more, but for how long? that why i say safe.

thanks

 

[gieri002]

Don't turn your boost up that high. He means your engine can handle that much but obviously your going to need fuel mods and engine management to be able to run it at its full potential.

 

[92EagleAWD]

umm, exactly how stock is your engine? Dont forget even at lower boost numbers you are flowing alot more air and can easily over run your stock fuel system. I had to run lower boost levels when i switched from the 14b to the b16g to avoid knock with the stock fuel system, and it still gained power. You should prob have a logger or a WB02 before you do that.

 

[BrokenTsi]

Get the supporting mods, get the big turbo, get it tuned on a dyno and they will tell you when its safe. There are too many variables to say exactly what psi will be safe.

Follow the upgrade path for DSM's.

 

[turboglenn]

This may or may not be important to you depending on your future boost level plans, but a big turbo running low boost needs a larger wastegate, and a smaller wastegate is more reliable and can be finer tuned when used for a big turbo running high boost... the opposite is true for a little turbo running high boost, it needs a big WG because they spool so much easier you need to bypass much more air in the top to keep from further spool and a smaller WG would be more tunable at lower pressures on a smaller turbo

I'm just typing this for archival purposes but there's a littlem list that goees like this
\
Big Turbo running high boost = smaller WG
Big turbo running low boost = large WG
Small turbo running high boost = Big WG
Small Turbo running low boost = small WG

Now all combos will work and hold boost levels in check, but the right gate for the application will do the best job of preventing boost fluctuations (more so seen in your logs than on the gauge)

One sign that tells ya the gate is too big forr the boost level/turbo combo is when you hear the gate open and close repeatedly like Bap-bap-bap-bap-bap instead of a constant flow of exhqaust (mainly audible on atmospheric dumps)

 

[dsm90gst]

ahhhh i see!
thanks for your help guys!

 

[Zdrummer15]

It may seem tempting, but your performance will only feel more sluggish at stock boost levels. You can't really raise the boost much higher then 15psi on stock injectors and the stock fuel pump. And you can't run bigger injectors without a way to tune it to compensate for the larger injectors. Most people will recommend you buy supporting mods first for this reason. It just makes sense. Installing ECMLink first won't hurt the car or it's performance so why go backwards?

 

[flawlessTSI]

yea you cant realy put a exact number on what boost is safe, there is way tomany variables to take in to account. but i did run 30 psi on a stock 7bolt for a year on a 37r untill the stock head bolts streched and blew the headgasket(cheep gas caused detonation). i did have the proper suporting goodies which is why it lasted so long.

 

[dsm90gst]

got it, thanks guys

Also on another note i got another question

which is a better route to go with?

My goals are to push out in the 500hp range (when built), but the turbo im looking is able to put me over 600

is it better to get a turbo that maxes in the 500 range? or will it be fine not running the turbo to its full potential (the 600+hp turbo onlt runing 500) is it a waste?

 

[Zdrummer15]

It will be easier to tune the car to get the power you want with a bigger turbo (after all supporting mods of course), but a smaller turbo will typically spool faster. Those are only generalizations though and it all depends on the specific turbos you're comparing. Anyway, running a turbo capable of pushing you towards 600hp at it's max is probably ideal for trying to easily and safely obtain 500hp.

 

[dsm90gst]

great! thanks guys you really helped me out alot

 

[dsm90gst]

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