SC430 HEADER INSTALL THREAD w/PICS, DYNO
Once the gears are in (next week i hope) and TC is in-couple of months-I will hit the 1/4 track as well to get some numbers. No doubt the car will be in the 13's, just where is up in the air right now.
Will use getch shortly to get an idea.
Will use getch shortly to get an idea.
Lexus Champion
Joined: Aug 2005
Posts: 2,015
Likes: 2
From: FL
Originally Posted by Pearlpower
Once the gears are in (next week i hope) and TC is in-couple of months-I will hit the 1/4 track as well to get some numbers. No doubt the car will be in the 13's, just where is up in the air right now.
Will use getch shortly to get an idea.
Will use getch shortly to get an idea.
what kind of new gearing? Is a TC and LSD not enough? Also who did you buy the headers from?
jbrady, what do you suppose that dip in the high RPM is attributed to?
Tony, gearing is the Supra TT automatic rear end. I have a 3.92 unit from a SC400 and was going to install a LSD in it but a 3.76/LSD unit came my way for a good price so I could not pass it up. Stock is 3.27. Dynos above were with stock gears. Placing a 3.76 gear in the car is equivalent to adding 15% more torque or 48 lbs of torque. Or in my situation up to and over 400lbs of torque-so says the math. Do a search on it. Gearing helps ALOT for these cars at the expense of some fuel consumption. Had it in my GS4 and loved it.
Headers purchased from ssheaders.com. Service is ok at best. Dont expect much feedback from them or responses if you email them. Shipping was quick though and the price cannot be beat.
Lee
Tony, gearing is the Supra TT automatic rear end. I have a 3.92 unit from a SC400 and was going to install a LSD in it but a 3.76/LSD unit came my way for a good price so I could not pass it up. Stock is 3.27. Dynos above were with stock gears. Placing a 3.76 gear in the car is equivalent to adding 15% more torque or 48 lbs of torque. Or in my situation up to and over 400lbs of torque-so says the math. Do a search on it. Gearing helps ALOT for these cars at the expense of some fuel consumption. Had it in my GS4 and loved it.
Headers purchased from ssheaders.com. Service is ok at best. Dont expect much feedback from them or responses if you email them. Shipping was quick though and the price cannot be beat.
Lee
Last edited by Pearlpower; Mar 2, 2006 at 10:55 AM.
Lexus Champion
Joined: Feb 2001
Posts: 3,124
Likes: 32
From: Texas
Originally Posted by Pearlpower
jbrady, what do you suppose that dip in the high RPM is attributed to?
You would need to monitor the ECU and determine if the timing is being pulled at that point. It is possible the knock sensors "think" they hear detonation due to an unknown harmonic. Just guessing really. You say you do not feel it drop, correct? Otherwise as you said the gain in torque is fantastic and really changes the way a car feels and drives. It is like adding a half a liter of displacement or more. Kind of like going from a 4.3 engine to a 4.8 liter engine in terms of torque gains. I feel these should really make more power but the camshafts may be the limiting factor... they are modest to say the least.
Last edited by JBrady; Mar 2, 2006 at 07:59 PM.
That was exactly my first thought-knock sensor picking up something. I will look into this futher. Not that I am losing any peak HP as it starts to drop from that poinit, but....would like to know.
Great job Lee 
It is great that someone finally has some accurate before and after #'s other than JP430's FI #'s now that should quiet the nay sayer's. This is a great starting foundation to validate our headers.
I notice that your A/F#'s seem lean, but w/o knowing what it was before the SRT intake It is not known exactly how lean it is. When I put my SRT intake on my A/F really got lean. But I don't know how much my altitude (5280') if any played in that
Can you post both of your charts with just your A/F #'s on them? so that it is larger and see where your A/F is? looks like it settled at 14.
I don't know how much more hp could be gained if you richen it up. You could throw on an
S-AFC II
It is great that someone finally has some accurate before and after #'s other than JP430's FI #'s now that should quiet the nay sayer's. This is a great starting foundation to validate our headers. I notice that your A/F#'s seem lean, but w/o knowing what it was before the SRT intake It is not known exactly how lean it is. When I put my SRT intake on my A/F really got lean. But I don't know how much my altitude (5280') if any played in that
Can you post both of your charts with just your A/F #'s on them? so that it is larger and see where your A/F is? looks like it settled at 14.
I don't know how much more hp could be gained if you richen it up. You could throw on an
S-AFC II