Well coil must have fixed the shutting off. Now for performace.

With the stock intake and 19lbs. injectors the truck would bounce off redline from a standstill Now with the air gap, 32lbs. injectors and correct air fuel ratio the truck will break them loose and run up to 3500 rpm and hook then drop back down. If I hit it going about 10 she will just take off and not even turn the tires over. HUGE drop in low end.

I am (believe) running 9.6 to one. and have 170 psi clyinder presssure(started at 150 and with multiple crank "sessions" got up to 170.

Hughes says this is ok.

Muscle motors (did my machine work) says this is wayy to high for 93 octane and I an detnating. And my computer is probably pulling timing out.

Hughes had this issue with a guy with the same cam running 215 psi becase of the duration/ overlap of the cam was too much.

Thoughts opinions?

About ready to get rid of the 408 all together and buy a diesel

 

Don't blame you, I have been following your threads. Good luck on whichever route you decide to go.

 

try having another tune written from sean till it gets right ! you should have alot more low end with that 408 , you could talk to bluebeast he just did his 408

 

Hmmm... 9.6:1, 93 octane, correct fuel:air ratio... detonation? Naaahhhh... does not compute.

 

Well you could sell me the 408 hahaha

Whats your A/F at?

 

A 408 should puke torque. Something's afoul.

What Size TB you got on there? Anything smaller than a 53mm is too small. Also, what's your exhaust setup? It should be long tube 3" true duals.

 

Could also talk to Indy, he's running a 408 with no problems?

 

thats true PM indy and ask him !

i also agree with aim, if the exhaust being to small and and throttle body . from your burnout video it doesnt sound like your exhaust is opened up , are you running stock cat still ?? and what muffler ?

stock air box ?? you could try a round intake from advance

 

Re figured my comp ratio and its 9.23 to 1 not 9.6

The problem with most of your suggestions is that this thing runs like a raped ape on the top end. Airbox,tb, exhaust all would greatly effect the top end.

I am running a 53mm tb, 2 1/2 duels without cats, stock airbox(All of these were on the truck when It had tons of lowend)

air fuel is 14.7 at idle drops right to 13.5 at wot and works its way to 12.5

 

He did not do a 408 he did a 365. Total different.