Need help with Cam Gear tuning
11-07-01, 06:17 AM
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Need help with Cam Gear tuning
I have an SC300 5spd. So far all I have done is mufflers out back and a conical air filter. I have an APEXi SAFC (air fuel controller), and I am waiting for a set of cam gears and underdrive pulleys. Obviously the pulleys are an install and go part, but the APEXi SAFC and cam gears require some considerable tuning for optimum operation. It was suggested by my local speed shop, who has no experience with this engine or setup, that I ask somebody who does how to set it up. I will be renting some time on a dyno so I will be able to tune as I go, but I was hoping somebody would be able to give an approximate place to start with the cam gears and if possible the SAFC.
Also is the fact that I have both of them going to change how they are each tuned, or are they independent of each other?
Any help would be much appreciated.
Also is the fact that I have both of them going to change how they are each tuned, or are they independent of each other?
Any help would be much appreciated.
11-07-01, 12:05 PM
#2
Lexus Test Driver
When I was first looking for cam gears, I found the following info and pasted it into a text file on my laptop. I can't remember where I got the info from tho!!
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However, we have found that setting the exhaust cam gear to -3 marks on the cam gear (-6 actual degrees)and +1 mark (+2 degrees) on the intake side will yield 10rwhp+.
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I would still try this on the dyno first...to be safe! Same for the S-AFC. I would only tune it on a dyno so you don't kill the motor. Of course...I've been tuning mine without a dyno since I got it...but I WOULD NOT reccomend that...
SR
***
However, we have found that setting the exhaust cam gear to -3 marks on the cam gear (-6 actual degrees)and +1 mark (+2 degrees) on the intake side will yield 10rwhp+.
***
I would still try this on the dyno first...to be safe! Same for the S-AFC. I would only tune it on a dyno so you don't kill the motor. Of course...I've been tuning mine without a dyno since I got it...but I WOULD NOT reccomend that...
SR
11-07-01, 01:26 PM
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Hey thanks for the info. Do you think that the tuning of the SAFC is independent of the timing on the cam gears? I do not plan on going to forced induction so this is pretty much it for the this engine. Do you know anything about tuning the SAFC without a turbo, or did you install that after you went turbo?
11-07-01, 03:19 PM
#5
Lexus Test Driver
Bean is correct about the crank pulley. You can install the rest of the pullies, and get some weight reduction/more power, but you don't want to install the crank pulley. You'll be buying a new engine in 10 or 20k miles if you do. 
You can likely sell the crank pully to someone on the MKIV.com (supra) forum since it's the same. Many people I've seen on there don't mind about wearing out their engines fast...lol
SR
You can likely sell the crank pully to someone on the MKIV.com (supra) forum since it's the same. Many people I've seen on there don't mind about wearing out their engines fast...lol
SR
11-07-01, 03:23 PM
#6
Lexus Test Driver
As for tuning...well they will work together and apart...if you know what I mean. I would do the cam gears first and tune, then do the S-AFC, then mess with the gears one more time.
I don't know of anyone here that has done both of these...you could also ask some of the people with non-turbo supras on MKIV.com. I did put my AFC on before the turbo, but I really didn't get much time to tune it. There are a few people on here that are currently starting to tune theirs...but each car is always different!
SR
I don't know of anyone here that has done both of these...you could also ask some of the people with non-turbo supras on MKIV.com. I did put my AFC on before the turbo, but I really didn't get much time to tune it. There are a few people on here that are currently starting to tune theirs...but each car is always different!
SR
11-08-01, 05:35 AM
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I remember reading the post about the crank pulley having the balancer in it too. I think I may just not install it. For anybody who was reading this and was thinking about getting pulleys, I think I saw that Nopi sells them all individually. Again, thanks for your help fellas.
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11-09-01, 06:55 AM
#10
really? It'd be sweet to see what happens on a turbo 2jz-ge motor with cams... with stock cams it has a REALLY fat powerband... it just plateus and never comes back down lol... it'd be interesting to see what kind of hp is made if the torque band is pushed further up
11-09-01, 08:11 AM
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There is no replacement for displacement. How big do the stroker kits go? That would be nice. It might fill the void in my life of not having a manual SC400. Sure would be nice.
11-09-01, 01:40 PM
#14
Originally posted by SC3BOY
There is no replacement for displacement. How big do the stroker kits go? That would be nice. It might fill the void in my life of not having a manual SC400. Sure would be nice.
There is no replacement for displacement. How big do the stroker kits go? That would be nice. It might fill the void in my life of not having a manual SC400. Sure would be nice.
With the cams, the stroker kit was quoted as gaining 100hp at the wheels. They even mentioned some sort of warrenty. I was going to go this route, but several people had mentioned the need for re-burning the computer chip to handle the change. So I put it off. NOw with the Apexi afc/s - whe can custom tune the car. Now the site is down and I have no way of hunting down this kit. Douuhh!