outlaw418

iTrader: (1)

1997 s10 5.3l xer281 cam th350 3000 coan stall 410 gear 28" tire vic jr 650 demon 66 jet prime 68 sec jet no vac leaks


OK IT RUNS GREAT DRIVES GREAT REVS FREE GREAT AND BLOWS THE TIRES OFF FROM 20MPH

BUT FROM DEAD STOP AROUND 2400 RPM FLAT FOOT IT AND NOTHING(NO POWER NO SPIN) NO BOG NO NOTHING LET UP AND ROLL TO 20MPH FLAT FOOT IT AND INSTANT REV LIMIT

WHAT THE F*CK

I HAVE NEVER RAN INTO THIS BEFORE I HAVE OWNED 9SEC CAR ALL THE WAY TO 14 SEC CARS AND NEVER RAN IN TO THIS


I KNOW ITS WAY OVER CAMMED BUT I PLAN ON SPRAYING THE HELL OUT OF IT!

outlaw418

iTrader: (1)

Come on no one! Really?

Old Geezer

iTrader: (3)

try the correct forum?? Likely get more hits.
"Next floor down"...
https://ls1tech.com/forums/pcm-diagnostics-tuning-7/

Pop N Wood

iTrader: (1)

I think the conversion section is the unofficial carb forum.

I'll try and help, not familiar with demon carbs, but at least it might start a dialog.

Do you have a wide band? Do you know if you are going rich or lean when this happens?

You don't mention your accell squirters. That would be my guess. What nozzles, cam and pump size are you running? Most guys run the bigger 50 cc booster on the primary side.

The off idle performance on my Holley is very sensitive to the accel pump cam. Make sure you have no gap in the linkage. You should see an nice solid shot with even the slightest touch of the throttle. The open plenum intake needs a cam with a rapid initial squirt. Holley says to moung it on #1 hole for motors like ours. Got this from the Holley site for #1 vs. #2 mounting hole

One other problem I once had was a leaking gasket on the accel squirter nozzle. This drained the gas out of the top of the squirter and would delay the shot on initial kick in.

Try reading through some of the carb setups in this sticky thread

https://ls1tech.com/forums/conversio...-dist-ls1.html



last guess is how old is the Demon? Quite a number of guys claim their new demons were full of metal shavings out of the box. Make sure none of the passages are blocked with junk.

Jimbo1367

bigger primary jet

poconojoe

iTrader: (43)

What are you running for igninion? An MSD box? Whats your timing map like? I have to agree with Pop though, it does sound like a missing fuel enrichment, but it should bog without fuel, so maybe not enough low RPM timing is losing too much bottom end torque.
Like Pop said, you should use a wide band to check the fuel

outlaw418

iTrader: (1)

thanks guys! i have 0 bog none at all i dont get it? its just flat(like a 300,000 mile 2.2l) and then around 2900 or so it will just blow the tires off,

i have used any thing from 25 to 37 shooters and moved the cam in every spot and also changed the cam to a pink one(fast shot).

crainholio

iTrader: (2)

Secondaries are coming in too late.

outlaw418

iTrader: (1)

after some adjusting i went the other way and jetted it to 80's frt an back and WOW GETTING SOMETHING DIFFERENT FOR ONCE! so after resetting the idle airs to 1 turn each and the shooters at 28 and 31 and 74 prime and 80 rear its coming around! but now the plugs look rich as hell (turning a mild brown) all the up the radius? and with the 74 jet i have a little stumbling till its moving(very little) so i think i need to now take a trip to the dyno and beat it now that it close and see what the A/F SAYS!


THANKS GUYS

Jimbo1367

Hmmmmmmmmmmmmmmmm. Its odd. A few peeps mentione3d jetting. Go figure

crainholio

iTrader: (2)

When people say they want to switch to carb because EFI is way too complicated, I want them to read this post...

outlaw418

iTrader: (1)

If i had it to do again i would have just bought a car intake and hp tuners and a turbo! O WAIT IM GOING TO DO THAT ANYWAY! LOL CARBS ARE GREAT IF YOU REALLY KNOW THEM AND I THOUGHT I DID TILL I MEET THIS ONE! LOL

crainholio

iTrader: (2)

I've met several professionals with Holley experience out the whazoo who got stumped by Demon carbs.