I am going to a dyno day for free, so i might as well tune my gears in the 3 runs i get. Which way do people turn the gears for turbo cars?

turbolude recommended -1 ex/+3 intake -- which got him ~20hp on his car.

any suggestions? i have 3 runs, so i gotta make the most of em.

 

Sounds good.

Usually you want to start by retarding the exhaust cam.

Results may vary of course.

 

I made 40 hp in the mid range (from factory settings) after 12 runs with -3 intake/-1 exhaust. But it all depends on your setup, all cars are different.

-JP

 

what are your baseline settings gonna be?

start with intake at o
exhaust -2

retard exhaust to -3 second run
see what happens

retard intake -1 see what happens


you should really spend more time on the dyno the results are worth it.

 

what type of cam gears are reliable? also, if upgrading cam gears... should i upgrade cams too?

 

I've been happy with both pairs of cam gears that I have had in the past, ie: AEM, Toda. It is nice to have degree marks on cam gears. For instance, Cusco cam gears do not have any markings, which doesn't make them any less of a cam gear, but it doesn't give you a "go-by."

You don't necessarily need new cams. Since you are adjusting your cams with the gears, it actually changes the time response of your valves. Thus, it is almost the same as replacing your cams with better ones.

-JP

 

yah, i heard AEM is cool. ill probably pick up a set of em. what kind of motor you running? i got a LS and i need to find out what gears i need. there a specific one for turbo?

and for some technical advice... i wanted to know... what the benefits of cam gears are... and some downsides if any.

 

just ordered me a set of SKUNK2 cam gears that were on sale at a shop for $200 at sacramento.

still... i want to know... what are the benefits of camgears on turbo charged engines? and the downsides?

 

DOHC turbo motors don't like overlap (exhaust and intake valves open at the same time). Cam gears let you dial out some of the overlap. Start by retarding the exhaust 1 or 2 degrees. You really must do this on the dyno to get accurate results. IMPORTANT...You must "zero out your new cam gears first". By this I mean when your new adjustable gear says zero, is it really zero? Poor quality control can cause errors of up to 2 degrees.
Earl

 

earl,
what motor are you running?




[Modified by dlplayboy, 10:38 PM 7/27/2001]

 

another question... does retarding cam gear timing have a direct relationship with ignition timing?

my ignition timing is stock. and im running 5-7 lbs of boost with my DRAG 3 LS.

just tryin to get some info here cause im still a newbie to all this turbo tech stuff. haha

 

im not familiar with the ls motor, but if you adjust a cam gear and that cam is connected to the distributer it will effect ignition timing. But all it takes is a simple adjustment with a timing light.

 

The main Idea and the ******* plan in life is to tune out overlap. Turbo's don't like overlap because you blow boost out the exhaust valve. Do a baseline run then tune from there...

Suprdave

 

dlplayboy...I run a GSR with a DFI. If you are running a factory ECU, after you adjust your cam gear, remove your neg battery cable for a few seconds and the computer should reset the timing by itself. Double check with your timing light.

 

earl,

i always thought that ignition timing was dependent on the position of the distributor (TDC). maybe im wrong... but even if i reset the ECU, wont it still run the same timing? just curious...