20psi on stock 4.8
#41
i did the same damn thing on my rear mount setup a year ago... coming back (winter in mt) -20 or more outside, pulling big hill started to really really go hard thought man this cool air is doing wonders looked at boost gauge it was pegged... bout **** but havent had any issues since then.
#42
UPDATE....got an '06 5.3 swapped in, and it's running great considering it's the same baseline tune blackbear sent me for the 4.8. I put a 7psi spring in and at WOT I'm seeing 8psi on the gauge, full boost by 3000rpm. I haven't flogged it too hard because it seems to be running lean by the AEM wideband, but when I did hit it on the highway it laid rubber at 70mph. However I'm seeing AFR's of 14 in boost so I'm not going to beat on it too hard til I do some logging and get the tune tweaked, hopefully tomorrow.
Ya it sucks I blew the 4.8, but the 5.3 feels alot better down low/out of boost so I guess it's not such a bad thing. I will get pics and vids up when the final tune is done. Thanks for all the advice.
Ya it sucks I blew the 4.8, but the 5.3 feels alot better down low/out of boost so I guess it's not such a bad thing. I will get pics and vids up when the final tune is done. Thanks for all the advice.
#48
Ya I know, it's hard to tell, my AF gauge seems pretty bouncy, but it's definately in the 13-14 range in boost. Would having open exhaust affect the AF ratio? I'm getting the exhaust finished today but up til now it's just been the downpipe wide open about a foot under the cab. When the exhaust is done I will start data logging and get blackbear to fine tune it.
#49
GFYS and STFU
iTrader: (8)
Ya I know, it's hard to tell, my AF gauge seems pretty bouncy, but it's definately in the 13-14 range in boost. Would having open exhaust affect the AF ratio? I'm getting the exhaust finished today but up til now it's just been the downpipe wide open about a foot under the cab. When the exhaust is done I will start data logging and get blackbear to fine tune it.
Your about to make another critical rookie error and blow a motor that is untuned, dont be so impatient or your gonna find yourself doing another swap soon.
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Suburban2500
INTERNAL ENGINE MODIFICATIONS
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07-19-2015 04:50 PM