[1slosvt]

Havent had much time to mess with the truck all summer but got the new engine broke in and beat on it a lil for the first time. Pulls hard up to about 4500 then kinda goes flat. Still pulls rpms but doesn't feel right. The cams are pretty rowdy bullet grinds...this thing should be making power and pulling hard at 4500. It almost sounds like its pinging above 4500. just a peculiar pinging that goes away as soon as it shifts. And when it shifts it starts pulling hard again. Springs are matched to the cams and no bind. Only 13 degrees of timing and it doesn't seem to matter if I add or pull timing. Datalog shows iats at under 150, intercooler pump is working, no flag on the knock sensor. make a hit and coasted back and pulled plugs and they look good, actually looks like it wants more timing but im being safe for now. Im on 93 oc with meth at about 16 psi. If anyone has any ideas Im open to suggestions. Thanks in advance.

 

[SVTdriver]

What blower?

What pulley ratio?

 

[1slosvt]

.030 over, tf heads, bullet cams, kb 2.2 blower converted to top inlet,3" upper, 8 pound lower,tr6 plugs at .025,9.4 cr and all supporting mods. base fuel pressure is set at 44 with aeromotive 1:1 fpr. Cant really hear the noise from the motor but you can hear it out of the exhaust almost like spark blow out

 

[1slosvt]

AFR is 11.3 to 11.5 but I only sample from the driver side.

 

[1slosvt]

And under normal driving under 4500 it pulls hard and makes no noise. But the truck has hi flo cats that have been hollowed out so it makes almost an exhaust leak sound....I wonder if that's the noise I hear when its wound up?

 

[thunderholt]

running out of fuel?

 

[1slosvt]

I wouldn't think its a fuel issue since the pressure raises per pound of boost as it should and the afr doesn't really fluctuate.

 

[1slosvt]

cams are .533 .571 lift and 220 230 at .05 and 112 lsa. not crazy but should be pulling past 4500 I would think

 

[1slosvt]

made a few changes and tried it again. just over 4k it starts to pull slow and then its like hitting a wall...once it shifts it pulls hard back up til there and then same thing. I don't think I can even get it to spin to 5500

 

[SVTdriver]

60lb injectors?

 

[SVTdriver]

Also those trick flows like timing.

 

[1slosvt]

yep 60s. You nailed it.. threw some more timing at it and it pulls hard all theway thru now.

 

[stoffer]

are the cams trick flow specific?


and as already stated. they require timing

 

[SVTdriver]

Glad you got it sorted

 

[harveyr2]

yeah just throw some timing at it.