IntercooledFlatty Posted January 30, 2015 Report Share Posted January 30, 2015 Is a safe, efficient boost level on a stock 12a intercooled car with a 2.5" exhaust ? ... Go ! Link to comment Share on other sites More sharing options...
ucw458 Posted January 30, 2015 Report Share Posted January 30, 2015 Efficient? I have yet to see a compressor map for a 12a. But I would guess it's around 10 psi. Link to comment Share on other sites More sharing options...
Skullzaflare Posted January 30, 2015 Report Share Posted January 30, 2015 12-13 max Link to comment Share on other sites More sharing options...
twojayzeestarion Posted January 30, 2015 Report Share Posted January 30, 2015 Under 15psi. The seem to start developing issues fast afterwards Link to comment Share on other sites More sharing options...
JohnnyWadd Posted January 30, 2015 Report Share Posted January 30, 2015 Under 15psi. The seem to start developing issues fast afterwards Yeah ! Link to comment Share on other sites More sharing options...
jonboyb Posted January 30, 2015 Report Share Posted January 30, 2015 Just unhook the wastegate you pansy 1 Link to comment Share on other sites More sharing options...
scott87star Posted January 30, 2015 Report Share Posted January 30, 2015 10 Link to comment Share on other sites More sharing options...
jonboyb Posted January 30, 2015 Report Share Posted January 30, 2015 I know the 12a on my MPI car is sitting at 15 and spikes to 18 read directly from the Megasquirt MAP sensor, and (knocks wood) has been fine for 3 years that way. I literally can't regulate it any lower....I've tried single and 3 port actuators. I'd love to keep it lower....but just ain't happening. Oh well, it's a hoot to drive though, although traction impaired. 1 Link to comment Share on other sites More sharing options...
MPGorBOOST Posted January 30, 2015 Report Share Posted January 30, 2015 ALL OF IT!! Link to comment Share on other sites More sharing options...
Xtreme Industries Posted January 30, 2015 Report Share Posted January 30, 2015 I ran mine at 13, but I believe 15 is where you should stop. Link to comment Share on other sites More sharing options...
TexasQuest Posted January 31, 2015 Report Share Posted January 31, 2015 I ran mine at 15 psi for about three months til she blew. The bearings were starting to go out before I raised the boost up. Just wanted to see what she could do. Link to comment Share on other sites More sharing options...
scott87star Posted February 1, 2015 Report Share Posted February 1, 2015 People think these engines are fragile, I think quite the opposite. They can actually stand up to a lot of abuse (>10 on a stock system) and keep on keeping on. Then when they do go people say things like "I ran it that way for (months, years) and it never had a problem and all of a sudden.......". Link to comment Share on other sites More sharing options...
twojayzeestarion Posted February 2, 2015 Report Share Posted February 2, 2015 I think they are very stout. I've beat the snot out of some And they continue on letting me do that with zero issues. I put a 19c/tdo5 turbo 1g mad and hard pipes on a 128*** mile auto 88 that was 5 speed swapped ran 25 psi daily drifting, racing, burnouts, and my favorite thing wasrolling backwards 20+mph on a hill then dumping 2nd at 6000 rpm and it lasted for near 7 months of that before cracking a ringland. Others I have turned the 12a up to 15psi and got a blown hg in return Link to comment Share on other sites More sharing options...
Skullzaflare Posted February 2, 2015 Report Share Posted February 2, 2015 (edited) People think these engines are fragile, I think quite the opposite. They can actually stand up to a lot of abuse (>10 on a stock system) and keep on keeping on. Then when they do go people say things like "I ran it that way for (months, years) and it never had a problem and all of a sudden.......".while this is true, OP is asking about max efficient boost on a 12a... yes i got a good run out of a tbi on hx35, 18psi afr was "goo" at 11.8, but broke ringlands on 1 and 4, since 1/4 are leaner than 2/3, and you are getting the combined afr once on mpi, i was running 25psi on my hx40, never broke anything on a stock bottom end, even when on a hx35 on mpi when my wastegate came unhooked and spiked 35-40psi and exploded my BOV (was before my 40 upgrade) Edited February 2, 2015 by Skullzaflare Link to comment Share on other sites More sharing options...
IntercooledFlatty Posted February 2, 2015 Author Report Share Posted February 2, 2015 i need to do another TPS / ISC reset, sat night it started to surge then i'll see what he does @ 10, then 12 and maybe 14 but THAT'S IT new head in the near future so if 14 pops the HG so be it... needs some love anyway @ 119xxx miles. over 2k miles so far and he is flawless FLATTY LOVE Link to comment Share on other sites More sharing options...
Skullzaflare Posted February 2, 2015 Report Share Posted February 2, 2015 i need to do another TPS / ISC reset, sat night it started to surge then i'll see what he does @ 10, then 12 and maybe 14 but THAT'S IT new head in the near future so if 14 pops the HG so be it... needs some love anyway @ 119xxx miles. over 2k miles so far and he is flawless FLATTY LOVE if your fuel is good, the turbo will explode before a 12a will pop the gasketunless your head is warped Link to comment Share on other sites More sharing options...
IntercooledFlatty Posted February 2, 2015 Author Report Share Posted February 2, 2015 fuel is good, small oil leak on front cover and pan but other than that all good. head questionable at 119xxx but i think it'll be OK for another 2k miles easily, even @ 12 psi Link to comment Share on other sites More sharing options...
TexasQuest Posted February 3, 2015 Report Share Posted February 3, 2015 I think 14-15 psi on a 12A is maxed out. After that it becomes just a hot air pump. Link to comment Share on other sites More sharing options...
ucw458 Posted February 3, 2015 Report Share Posted February 3, 2015 I think 14-15 psi on a 12A is maxed out. After that it becomes just a hot air pump. A rough guesstimate, at 15 PSI a 12a is spinning around 170k rpm at around 55-60% efficiency and sitting on the surge line of the compressor map. This is based off a td04 13g compressor map. A 12a will produce less air than the 13g. on the left 2.0 is 15 psi and on the bottom around 0.16 is close to what a 2.6 should be flowing at that pressure. http://i217.photobucket.com/albums/cc33/seansean26/td04-13g.gif Plug those same #s into a small 16g and you get way more efficiency. http://i217.photobucket.com/albums/cc33/seansean26/td05-16gsmall.gif Link to comment Share on other sites More sharing options...
Doctor_Drift Posted February 3, 2015 Report Share Posted February 3, 2015 I was running 16 with the stock intercooler before any notable intake temp rise. I would say 14 or so to stay on the max efficiency island of the compressor. I am running 20 now with the t3/to4b 60 trim STILL with tbi like a boss but Risky!!! Link to comment Share on other sites More sharing options...
IntercooledFlatty Posted February 3, 2015 Author Report Share Posted February 3, 2015 ...so crank it to 20 psi then right ? :lol: Link to comment Share on other sites More sharing options...
Doctor_Drift Posted February 3, 2015 Report Share Posted February 3, 2015 I say go for it lol. just talk sweetly to your head gasket and fill the tank with unicorn piss and boost 30 dude. Why so many questions grasshopper. lmao Link to comment Share on other sites More sharing options...
JohnnyWadd Posted February 5, 2015 Report Share Posted February 5, 2015 Use JDM gasoline and boost to 45 psi Link to comment Share on other sites More sharing options...
JAinsworth Posted February 5, 2015 Report Share Posted February 5, 2015 Go for broke, just remove the vacuum line from it Jimmy Link to comment Share on other sites More sharing options...
IntercooledFlatty Posted February 5, 2015 Author Report Share Posted February 5, 2015 Jimmy, Jonboy told me the same thing but he also called me a name that i cant repeat here ... especially since i'm being " watched " :ph34r: Link to comment Share on other sites More sharing options...
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