I finally got a 2 1/4" pipe from the manifold to muffler (a Magnaflow) today, keeping the 2" tail pipe. Will I need to change the jetting on my Holley 1920 to compensate for the larger diameter exhaust pipe? I'm running a #58 jet now.

Naw.... but you may be tempted to go larger... make it go faster!

~THOR~

_________________
1984 D100 Shorty Custom
Certified Auto Appraiser - RevItUp Classic Appraisals
President - Cherry City Bombers CC
Part of Tyrde-Browne Racing

simply fattening the main jet will not make you go faster unless you are already running lean.

go out and enjoy your new exhaust for a while, then come back and read your plugs. go up or down depending on what they tell you.

_________________
I've been calling it as i see it for my entire life and that's not about to change. Take it or leave it.

Eric,

No, you don't need to go fatter. Stick with the #58. I have gone as low as a #55 just to see what would happen. A #57 is what I am running which is right on the edge, the #58 gives much better vacuum readings and keeps you out of the power valve a little more.

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Hi

As I understand it the moment you go from stock to headers with free flow system there is sometimes an enrichment needed

_________________
Regards,
Fanie Gerber
It's never junk, it's just a part you're not currently using

http://www.valiant50.co.za
Just say I own a few Mopars

Depends, if your car starts to surge, then you need bigger main jets.

What he said.

I went up to a #60 and played around with the emulsifier screw. Car seems to like it, with a little more umph in the mid range. Car is louder with bigger pipe, thats for sure.

See, toldya you wouldnt be able to resist putting a fatter jet in there! Goes faster!

~THOR~

_________________
1984 D100 Shorty Custom
Certified Auto Appraiser - RevItUp Classic Appraisals
President - Cherry City Bombers CC
Part of Tyrde-Browne Racing

Eric,


How big (in drill size) would you say your idle air bleed is now that you opened it up with the brass screw adjuster?

I have gone as high as a 61-2 with out going below 23 mpg with a .035 diam. hole which is the same as a #65 drill bit.

It is surprising how much more power you unharness with a little bigger exhaust pipe!

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

I get a bigger oil smoke screen also....

Everything on the carburetor is stock Ted, so I don't know the size.

Eric,

Ok, how many turns out on the brass idle air bleed screw did you go? I will compare with on of my other carbs down stairs.

_________________
Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live ... %20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG

Like what 10-15 hp tops with the stock cam, and maybe about 10 ft/ lbs of torque....just enough to shift the torque curve a bit, and make a little better mileage...

-D.idiot

Only about three quarters of a turn. It's really sensitive. If I just turn it out a tiny bit the vacuum and idle quality goes down. If I turn it in all the way, it will still idle fine but the engine starts shacking a little bit. Like I said, real sensitive.

Its a bitch keeping my foot out of it....burn more oil ya know.