boxpin Posted September 30, 2010 Report Share Posted September 30, 2010 For some reason everyone that is running an 18T has this 18psi limit in their head...its in mine too. Where or who set this limit? Does something magical happen at 19psi like you grow Fairy Wings? Why do we all set the PSI to 18? I am sure there are lots of you out there with 19T's, K24's, etc running more boost but where did this 18psi number come from? Link to comment Share on other sites More sharing options...
TRACStar Posted September 30, 2010 Report Share Posted September 30, 2010 Makes no sense to me, I run my 16T at 18psi. Link to comment Share on other sites More sharing options...
BlackT5 Posted September 30, 2010 Report Share Posted September 30, 2010 I think some of the 18T shelf tunes are maybe set for 18psi? Could also be that people don't wanna risk bending rods with more boost. Link to comment Share on other sites More sharing options...
Wagoneer855 Posted September 30, 2010 Report Share Posted September 30, 2010 Because even with an 18T anything over 18psi isn't going to gain you much horsepower, just mid-range torque which is what breaks things. Link to comment Share on other sites More sharing options...
caanglin Posted September 30, 2010 Report Share Posted September 30, 2010 Makes no sense to me, I run my 16T at 18psi. Same here I run 18-19. People say it blows hot air at that psi but; that hot air makes it pull harder some how. Link to comment Share on other sites More sharing options...
TRACStar Posted September 30, 2010 Report Share Posted September 30, 2010 Same here I run 18-19. People say it blows hot air at that psi but; that hot air makes it pull harder some how. Agreed Results speak for themselves. ;) Link to comment Share on other sites More sharing options...
WayAway Posted September 30, 2010 Report Share Posted September 30, 2010 How safe is that with an 18t on stock rods thou. Ive been looking into this for my next upgrade, but i wouldlt wanna risk bending my poor rods Link to comment Share on other sites More sharing options...
regime Posted September 30, 2010 Report Share Posted September 30, 2010 I think its written in your state constitution out there =) I would have to hazard a guess that it loses efficiency higher up... but just a guess... Plus that whole Spaghetti Rod issue.. Link to comment Share on other sites More sharing options...
Black Betty Posted September 30, 2010 Report Share Posted September 30, 2010 Look up the compressor maps. If you could just turn up any turbo no one would ever upgrade from a 15g... Link to comment Share on other sites More sharing options...
magicaljake Posted September 30, 2010 Report Share Posted September 30, 2010 i hit 20 psi or so with my 18t all the time... and yes i have a mbc and yes i have a super-tight waste-gate actuator... been this way for 10 thousand miles.... no bent rods here... that beign said... im not sure how much faster the car is @ 20 psi opposed to 18... Link to comment Share on other sites More sharing options...
Zappo Posted September 30, 2010 Report Share Posted September 30, 2010 I hit 24 psi on my 18t and bent all my rods. Failed BCS. 18 psi is because that is where most tunes are set. I wouldn't go much above that if you have stock rods because you are already near the limit. That is probably the main reason the tunes don't go above that. Link to comment Share on other sites More sharing options...
WayAway Posted September 30, 2010 Report Share Posted September 30, 2010 seems like an EBC would be the safest rout to go...? Link to comment Share on other sites More sharing options...
Snabb T5M Posted September 30, 2010 Report Share Posted September 30, 2010 When I installed my IPD Stage III (tune, 18T, etc) I went and had it dyno tuned to see if I could effectively run it at 19 or 20psi. The IPD tune is set for 18psi. I am also running a kick ass EBC that bypasses the ECU and controls the boost. My tuner started at 20psi, then 19psi, the car didn't like it, so we ended up at 18.5psi and that's where the most HP was being made (307whp on a Dynapack dyno). The tuner said it was a MAF issue, couldn't get enough air in. NOW, please don't rely on what I'm saying here, still trying to understand how this stuff works. But he used an analogy of the engine needing 3" worth of air thru the MAF and it was limited to 2.5". He said the ricer cars had a similar issue, but with the stand alone units the ricers use, they were able to trick the MAF or whatever into thinking it was a 3" MAF. I'm assuming TurboTuner could help solve this problem.** I also wondered why more psi couldn't be run with an 18T and that was my goal with the EBC to see if I could run more psi, but now I have concrete proof that an 18T can't be run more than 18.5psi effectively. My EBC is set to 18.5 psi, and I hold that all the way through. **again, please forgive me if my explanations don't seem sensible, I'm still trying to learn this stuff and how it all works together. Perhaps others "in the know" can address the MAF issue. Link to comment Share on other sites More sharing options...
Keep Calm Chive On Posted October 1, 2010 Report Share Posted October 1, 2010 would parallel MBC/TCV be a safety net incase the TCV/BCS were to ever fails? cheaper than EBC, no instaboost as just a MBC alone, nice smoother onset of TCV, then MBC to control overboosty & take over incase TCV ever takes a nice dump Link to comment Share on other sites More sharing options...
theForgottenone Posted October 1, 2010 Report Share Posted October 1, 2010 If that was the case as Leroy said, why not get a custom 3" maf from a different car to run higher boost Link to comment Share on other sites More sharing options...
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