car wont stall with auto, help!!

[fastfocus]

ok, i tried to post this in auto forum but it wont let me yet... so here's the deal

i've got a 50trim, fmic, walboro 255hp not re-wired yet, 680's, gm mafs, in a stock 7bolt 2g.

when i had the t25 i could stall it up to around 3200 on stock converter and it would go. now with the 50 trim it will only stall up to 2200 and build like 1-2psi of boost. is there somethign wrong here? i read some posts in the auto forum, and someone said they had a 50 trim with 272s building 15pounds on stock stall... is it in my tuning? or what? i would think 272's would produce lower flow down low and cause it to not stall as good as stock cams.

anyway, i would really like to get this figured out by this weeknd if anyone has any ideas...

 

[Jeff822]

Its weird, this is about what mine is on just a evo 3 16g.

 

[fastfocus]

yea and it sux,,, any ideas? i'm gonna just try to mess with the tuning a lil more on friday but,,, i dont understand.

 

[fastfocus]

bump? anyone?

 

[chanley talon]

Hey auto dsm guy here! Well i would boost leak test it first and foremost. What is the size of the turbine housing . Also on a stock converter and a 50 trim it will not be as eay to build boost setting still . I learned this when i thought that a evo3 16g would out preform my small 16g . WRONG The small 16g spools way faster and makes nearly the same topend power. Your possibly just suffering from lag of a big turbo . If you were to get a high stall torque converter from ipt tuning it would spool and be gone because you could get a higher rpm before launch . If you were to just slap on a smaller turbine housing it would increase you spool sitting still or power braking if you will. My small16g on a stock converter will boost to 21 psi or higher if i cranked it higher it will spool like crazy. That usally around 2500 -3000 rpm factory stall . With a 4500 ipt you couldspool up a 50 trim off the line . That would would feel really good. Well tell us if you have a boost leak. I do believe it should spool higher than 1 or 2 psi you should be able to get close to 15 or higher i could stall the evo3 16g it just took forever to get up there you may have to pump the gas a llitte while you stalling the turbo to get it rolling.

 

[fastfocus]

the thing is, it wont stall past 2200, i'll try to pump the gas a lil next time i try.

and i was thinkin bout a boost leak test a lil bit ago so i'm going to try that also,,, but hell if i could get it to build 15 pounds off the line it'd be great... i'm fwd so i dont wanna build some crazy boost off the line anyway...

also, i kno its lag from a big turbo and i kno if i got a higher stall converter from ipt i'd be set. and that is what i'm planning on doing. i'm just very short on cash from bills right now, and i read that some one was actually spooling a 50 trim on stock stall... so i figured something might be wrong...

 

[chanley talon]

Me to on the money part . After i wrote that i figured you knew that . But on a fwd wow that would be some serious traction issues . Boost leak or controller trouble id say. Let me know what you find.