8URWS6

What is the limit of mods that you can do with the speed density set up?

I know it's better to go with the mass air but I was just wanting to know what the boundries were on the speed density. Thanks

marx91

dont change the cam thats when the problems start

8URWS6

So I can at least use some iron GT-40 heads and a Trick Flo intake with a larger thottle body?
I've heard the same thing from others that when you change the cam it all goes down south from there, but I didn't know why.

Tims 88GT

^^marx91 ill argue with ya you can change the cam. go to corral.net and look it up. there are certin cams that will work with SD cars. U are better off to switch to mass air.

Joel5.0

As Tim 88GT said....you could upgrade the cam, but within a very narrow duration/overlap specifications range. Having a vacuum controlled system (speed density) makes it very susceptible to cams that will lower engine vacuum production...specifically at idle/part throttle.... Less vacuum = richer A/F + driveability problems + idle problems.....heads/intake/exhaust/drivetrain are upgrades that shouldn't cause major problems though. My 2¢.

Twister

I have everything done to my 86 without boosting or juicing...I even have a cam, and I am still speed density. I have a isky 252/257 cam

Liquid_02

Intake and cam are pretty much all you can get away with for engine mods, heads are reeeally pushing it, lots of people have problems with heads.

Twister

I have not had an issue with GT40 heads, a Cobra intake, 65mm TB, 24 pounders, full exhaust...

88BlueGT

I have basically every bolt on besides heads and didnt have a problem in my 88GT