Build Threads Details on Club Lexus LS400 owner vehicles


Old 04-08-07, 09:01 AM
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Originally Posted by CrazyHawaiian View Post
Huge injectors like 700+cc might not be streetable on these cars unless you change the Injector driver or wiring to support low impedance injectors. These cars are wired for high impedance injectors, this means low current. At higher flow ratings the high impedance injectors can pose an idle problem like akxx mentioned. The flow size does play a role but its more due to the impedance type. The more an injector flows the bigger the components get (heavier they get), the more "power" it takes to operate them at acceptable speeds. The "power" is actually the ammount of current going to the injector, the more current there is the faster the injector control (pintle or disk) can move/snap. Aside from that, the type of control switch is different between high and low impedance injectors (research peak and hold), mix matching them the wrong way will likely cause damage to the injector and maybe even the driver over time. So if you guys do plan on running the bigger injectors I would definately research the injector drivers and what can be done with them. Remember, difference between getting something to physically fit and getting something that will run right and be reliable.
thats some good info that is

If you guys are serious about supercharging your 1UZFE I would look into having a custom cam made. The correct cam can make the world of difference in both power and tuning aspects. Usually cam's designed for n/a motors are not ideal for boosted applications, though sometimes there are exceptions. You can also match the powerband of the cam with the powerband of the forced induction type. Since you guys are talking about using roots superchargers you'd probably want to consider a lower end powerband with maximum torque. If it was a centrifugal supercharger like a Vortech then you'd want to consider a more mid-range to higher end powerband. Or if its turbo then you'd want the powerband to begin when the turbo is spooled (so depends on what turbo you use).
cams are available (pre-ground and custom) in australia but the price is approx 2000-3000USD. AND nobody i know of has them yet. Lextreme said hes gunna start recieving some soon so im waiting to see how they work out for him
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Old 04-08-07, 07:16 PM
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Just to add a spin to this thread - look at this link (GM Delco computer with a 1UZFE) - The Aussies do it all
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Old 04-08-07, 09:10 PM
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Haven't seen too much to indicate that cams are very beneficial on a mild (~500RWHP) 1UZ. I'm sure the 1000HP crazies are using them, but the stockers seem to quite adequate to *mild* levels. Of course, your definition of mild may vary.
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Old 04-09-07, 02:30 AM
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I'm not sure what the stock cam specs are but for the most part the lobe seperation and exhaust duration is what plays a big role in boosted applications. If its too narrow or too much duration, boost might bleed out through the exhaust valve(s). This would result in less cylinder pressure, less overall power. Might be something to look into if you really want to maximize the potential of the blower.
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