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L8 APEX
05-20-2005, 11:06 PM
Hint, it is not the hump in the middle that is converter lockup. One pull is street tune 14psi. The second pull is 18psi race.
http://www.svtgalleries.net/gallery/data/500/CIMG2973.JPG
Sixpipes
05-20-2005, 11:35 PM
Tires breaking loose on the dyno? :cool:
L8 APEX
05-20-2005, 11:43 PM
Nope, leaning out. The customer said he upgraded the fuel system but I am a little suspicious as to what the injectors really are. As soon as it hits 500rwhp it just starts clipping max duty cycle and goes lean.
QIK KAT
05-21-2005, 02:55 PM
Would that be considered a problem truck:evil
L8 APEX
05-21-2005, 11:55 PM
The customer is very lucky the engine is still in one piece. He has been racing it on a mail order tune and has pullies up to 22psi. We are changing injectors Tuesday and giving it another shot.
L8 APEX
05-26-2005, 12:26 AM
Wow, I can't believe the difference in 55lb vs 60lb injectors.. 55's maxed out at 500rwhp on this truck.. The 60's have room for about 20-22psi off the KB and built motor.
L8 APEX
05-26-2005, 12:31 AM
Hmm, multiply your injector by 10 and that is rouchly the HP it is good for:D .
Mark #2
05-26-2005, 08:19 PM
Even on a stock block? Like me;)
L8 APEX
05-26-2005, 08:28 PM
Data log the injector duty cycle. This truck the cycle was declining as rpms rose. With the 60's the duty cycle is linear not peaking or humping over. This is a ported head and larger cam so we are flowing a shatload of air. 18psi on this motor is probably 22-24psi on a stock block..
wesman
05-27-2005, 11:54 AM
Wow, I can't believe the difference in 55lb vs 60lb injectors.. 55's maxed out at 500rwhp on this truck.. The 60's have room for about 20-22psi off the KB and built motor.

and you wondered why I wanted to go 60's over the 50-55's ;)