dam son 15psi? Most of the stage 2's are 9-10psi. She must have some real good power. I have not heard of anyone doing that psi on stock internals.
I have put a Forge manual boost controller (UNOS)on my Rabbit and with it turned all the way down (and the softest spring) I am hitting 15/16lbs. Its been this way for two weeks now and so far so good. I have yet to hit the 15/16lb and stay into to it for more than a couple secs tho. The motor has the stock bottom end and no head spacer. Anyone out there boosting over 10lbs ? looking for some thoughts.
i can say that i have boosted consistently 11lbs. and one evening i was tired and mistakenly forgot to connect my wastegate line. and ummm? yeah hit 13-15lbs like a banshee and immediately got out of it. kinda scared me lol...but i've done a compression test and all is still good.
so at least i didnt blow my rings or valve seats...
god i love my car. it may not be fast, but it's crazy fun!
C2 stage 2 TURBO!!! ACHTUNG!!! 2.5liter 5cylinder contents under pressure!!!
the biggest issue would be the hot turbo, hence the oil temps.
oil cooler, imo, is a must after 8-10 lbs
Going over 10 psi on stock compression is usually not recommended... I would get it in the 9-10 range to be safe till you can lower compression, honestly.
well.. this begs the question that jeff always tells me:
"who has done it?"
the exciting and scary thing about the 2.5 is that MOST people and companies havent really tested... meaning: do it till it breaks. then record the braking point.
IE: we know that after 15-16 psi, the oe fuel pump CANT do more.
we know that we CANT use 87 on a turbo car.
we know that 8-10 psi with no intercooler WILL eff up the piston rings.
we know that the 2.5 flows BETTER than a vr6, but we dont know how to take advantage of the flow. etc
sugestion: break it.
log, test and go till it breaks.
most important thing: do you have a proper fuel map at said PSI?
lastly: when/if it brakes, replace the engine. then you can build it.
now comes the real question: what WILL you do?
Pretty sure this is what he is trying to AVOID by asking us this question...
Not many people have the funds to blow motors for research purposes and the fact that NO company has done it so far proves that point lol.
Over the course of the last few years, we have learned things about the 2.5L (as Fred mentioned above) and we, as car nuts and companies, have also learned a lot about turbo cars in general over decades of performance tuning. If you operate within what we've learned and the general rules of what's safe, your motor will stay in tact. Pushing those boundaries (which you may be doing right now) results in a blown motor.
There is absolutely NOTHING wrong with testing boundaries.... hell, that's how we have all of the performance software available today from TONS of companies; they pushed the boundaries. The problem becomes, if you push those boundaries hard enough and the motor blows, can you fund another motor?
yea, I would never unless someone sponsors the testing (pay for new parts when the engine blows) plus I don't feel like messing around with it and spending the time to fix.
I bought the head spacer kit which is known to make it safe to go to 15psi and not worry about blowing you engine, which will cost money and time to fix. But now MY question is, can you go over 15psi with head spacer
United Motorsports 2.5T
Over 15 psi?
Andre and Jeff report that OEM fuel pump runs out
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So i'll upgrade it
No, i'm just kidding. This car will probably never go any further than the upcoming mods. I mean the thing is already fast enough just stage 2! There is no need to go further, but I wanted a project for when I come home Plus I want my dad to stop making fun of me saying that the car's not that fast
Last edited by pennsydubbin; 04-25-2012 at 01:59 PM.
United Motorsports 2.5T
All good feed back guys..... do I want to blow a motor with only 9k on it ??? nooooo but if I do ill build a beast ! lol. Like I said so far she will hit 15/16lbs (if gauge is correct) and then ill back it down. No funny smells, no wierd noises, no starving of fuel. Now... I havnt layed into it at the 15/16lbs for more than a couple seconds which i am sure can open up a whole other can of worms. I am running C2 stage II software. Deff will agree that 9-11lbs of boost is safe for a NA motor (at least the 2.5L) I also know from a liability standpoint a company will never recommend anything over a safe point. For the guys that build and test their cars.... you do learn a lot about how it ticks and usually can use your judgment on how it runs. I believe its all a learning curve so all feed back is appreciated guys.
my personal insight.
15-16 psi on stock pump and stock motor is too much
after 15psi you should have a inline pump and head spacer
10 psi is SAFE on a stock 2.5L. more IS possible but not safe......
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