WOT issue???Need advice/help!!!

GM tech

GM tech

New member
The alcy inj I posted about was a potential cure for WOT issues I have been having.
My truck has been falling flat @ 12psi under WOT in 2nd gear,won't shift if I force the issue,I ease off the throttle to 3/4 and it upshifts and pulls decent.It's got good power through 1st and most of 2nd,but if it kicks down or I try to stand on it in 3rd on the freeway,it falls on it's face.It feels like lack of fuel to me.I'll list my mods below:purchased most everything from RPM,
Engine:hardened crank,forged rods,forged pistons,h/v oil pump,vortec head swap/intake mod,crane 2020 cam,dbl roller chain,S/S valves,comp spring kit,port mached heads/intake,ARP hardware,RPM Turbonetics stage 1 turbo.
Fuel/Ignition/Air:MSD billet dist and coil,taylor wires w/thermal socks,ATR upper intercooler,h/v intercooler pump,thermal wrapped crossover pipe and down pipe,Ultimate chip/stock injectors and 3 bar MAP,Walbro 255lph fuel pump,KB cold air intake/AFPR,taylor battery relocate kit,RPM brake booster line,spearco boost gauge.
All engine sensors and vacuum lines are new.
I am running a high flow cat,Magnaflow muffler,stock pipes and manifolds
Runs great otherwise,smooth idle and feels fine under normal driving conditions.Any advice or tips would be helpful,
 
Tooky

Tooky

Serious about performance
Re: WOT issue???Need advice/help!!!

What's your scan tool show for knock retard when this happens? What AFR does your wideband read? Your truck has an awful lot of mods; if you don't have these 2 tools I would strongly suggest them.
 
turbodig

turbodig

Active member
Re: WOT issue???Need advice/help!!!

GM tech said:
The alcy inj I posted about was a potential cure for WOT issues I have been having.
My truck has been falling flat @ 12psi under WOT in 2nd gear,won't shift if I force the issue,I ease off the throttle to 3/4 and it upshifts and pulls decent.It's got good power through 1st and most of 2nd,but if it kicks down or I try to stand on it in 3rd on the freeway,it falls on it's face.It feels like lack of fuel to me.
Click to expand...

Sure it's not hitting a rev limit there? Ie, trans is slipping in 3rd and bumping the limiter?
This is more common on the 1-2 shift, though.

Otherwise, I'd say ignition issue. Alky will make poor ignition problems *worse*.

Without a datalog to look at, it's kinda tough to tell.
 
willyson

willyson

trollin'
Re: WOT issue???Need advice/help!!!

i bet its knocking like crazy and pulling heavy timing. did you bump your FP up with the install of the Ultimate? what is your FP set at?
 
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