Engine/Transmission (1994 - 1998) 96 low smoke good power. ???

[JMerkel]

i just got a 96 5speed its got good power but doesnt smoke much so i dont think its getting full fuel. i changed the fuel filter and cleaned the strainer and took the fuel plate out n still low on smoke so i removed the afc and took it for a drive but still dont smoke as much as i think it should. the shutdown seloniod is getting full travel and i stretched the spring in the overflow valve to just over a half inch cause it was a little short. its got good boost and i can get the egt to 1000* post turbo but idk what fuel pressure is since i have no gauge yet it smokes some when i first hit the throttle before boost comes up but at full throttle its just a slite haze i also checked to make sure its getting full throtle so my questioin is how much should a stock 12v smoke with no fuel plate or afc? sorry for the long post just trying to giv as much info as possible. thanks

 

[KBurgoyne]

what do you mean no afc. to get it to smoke you would move the housing forward. if you took the fuel plate out on a 215 pump it should melt the turbo with no problem, and smoke like a freight train.

 

[Missouri Mule]

What is the boost reading? Stock or aftermarket turbo?

 

[hsmith]

If it runs good with power, why do you need smoke?? I'm happy with mine not smoking the neighborhood.

 

[JMerkel]

i mean i took the whole afc housing off and took it for a test drive to see if something with the afc wasnt working right and it ran the same as when i tried it with the housing moved forward. im trying to figure out if its getting all of the fuel it should be getting. i can peg the 35lb boost gauge and the egt is around 1000* post turbo. im going to build this into a pulling truck im not just going to drive around blowing smoke everywhere but i want to make sure its running right stock before i go buying all kinds of parts and still not having it run right

 

[hsmith]

So, what is Comp D teling you?"?

 

[JMerkel]

not much but I'm thinking it's low fuel pressure. either a weak lift pump or bad overflow valve. Ill find out when I get a fuel pressure gauge

 

[JKosten]

First get a Torq Tek fuel snubber from Geno's and check your lift pressure.

Then set your wastegate to >35psi as that is the choke point for a HX35W.

Or get a bigger turbo and plan on doing some engine mod's like O-rings and head studs...

I would recommend also getting a Tork Tek overflow valve as the Bosch ones don't hold up that well.

 

[JMerkel]

i got a new overflow valve and fuel pressure gauge installed today and the fuel pressure is around 23lb at idle and about 7lb at wot. i think thats on the low side but maby not i also put in a new boost gauge and boost was just under 40lb at wot and the egt got to about 1100* post turbo witch i thing is pretty high. any suggestions

 

[JKosten]

That is not enough fuel pressure. You should have atleast 25+ at wot and 30 at idle.

 

[JMerkel]

thats what i thought. so i guess the only thing left is to replace the lift pump. should i get a stock replacement or a fass/airdog. i heard the stock lift pump can flow alot of fuel but how much fuel? i dont want it to be the limiting factor on power. this is going to be a pulling truck and im planing on a min of 700hp

 

[BigPapa]

Normal fuel transfer/lift pump pressure specifications are 17 - 22 psi at idle and of 25 - 35 psi at 2500 rpm (no load). Is your WOT pressure while driving or free revving?



For 700HP your going to need quite a few fuel system upgrades, not just a lift pump. You'll also want 50+psi.

 

[JMerkel]

the fuel pressure is while driving, accelerating under load. what kind of fuel system upgrades? thanks