Z28XTC

iTrader: (5)

1.Fan temperatures, what is the best on & off temperatures for both fans on street/strip 400hp Z28.
2.Fuel,Air & Spark,should I adjust these for better preformance?
3.Shift Points Mph,to what Mph should I adjust this(I have adjusted rpm shift points to 6,500rpms).
If someone could help with these it would be great.

Z28XTC

iTrader: (5)

tttttt

SSpdDmon

iTrader: (10)

What's done to the car outside of what's in the sig? If it's a stock internal LS1, there's no reason to be shifting/reving to 6500rpm. Unless you have gears, you don't need to change the shift mph. I'd get the car to shift by 6200rpm and then set the rev limiter at 6300rpm. The fuel/spark settings should really be checked with a wideband & dyno. If you don't see any KR, you could add in 2~3% spark and see if it feels any faster. Going to be hard to do it by "feel," which is why you need the dyno. I wouldn't lean it out any without a wideband. If you do find your way to a wideband, lean out the PE a little bit at a time until you get close to a 12.5AFR. Also, make sure you don't have positive LTFT's at WOT. If you do, you'll need to get a custom tune from a place like RWTD to get them in line. As for the fans, I'd drop them down 10~15*F from stock. That's about all you can do with that tool though.

Z28XTC

iTrader: (5)

I have 3.73s but have not put them in yet but will do soon.As for adding spark I can not because I have a SLP diablo and it will only let me minus up to 5% spark.Summers are really hot here so should I drop the fans down more than that?Also way not take revlimit out to 6500rpms?

2001NBMZ28

There's some predator tuning info here: www.ls1tech.com/forums/showpost.php?p=2652650

Don't know about the SLP unit, but if it's like mine you'll need to change your gears using this: www.runninwiththedevil.com/faq.htm

SSpdDmon

iTrader: (10)

Well, it sounds like you're stuck with the spark advance they gave you. If you see KR, you can back it out. Otherwise, it sounds like you'll have to leave spark well enough alone.

As for the fans, the stock thermostat in the radiator doesn't open until like mid-190's. When you're driving around, the fans aren't usually running unless the coolant temp is up there. So, dropping the fans more than 15*F is not going to make much of a difference (not that dropping the fan settings is going to make a huge difference in the first place).

When it comes to the revs, there's a reason why the stock valvetrain is limited to 6200rpms from the factory. If you want to rev higher and risk spring, pushrod or valve damage....go right ahead. But, the stock cam in these cars peaks at 5600rpm. After that power begins to drop off, which is why you need to shift and get back in the powerband.

Z28XTC

iTrader: (5)

I have a 160 thhermostat aswell but have not fitted it yet will this make a differece of some sorts with what I should set my fan settings at?And sspd demon I have 99 so I have a bigger cam than 2000 and newer cars would this make a difference to what I should set my rev limiter to?And I am really appreaciating your insight on this thanks a lot.what is KR?

Z28XTC

iTrader: (5)

tttttt

SSpdDmon

iTrader: (10)

With the 160* stat, you can drop the on/off temps a little more. The only thing is the lower you set them, the more the fans will run. Granted, they're not known from burning out. But, I would keep an eye on temps when your driving around (using the scanner part because the temp guage is inaccurate). You may find you don't need to drop them too far.

The factory cam size (be it '99 or '02) is not a factor in where you set your rev limiter. It's power curve is. Ever see a stock cam dyno sheet?

This one cuts off at 6K rpm. The peak power hits at 5600RPM. Why spin the motor past 6200RPM and put the extra stress on the crank and rod bolts, valve springs and push rods when you're making less and less power??? I say make it shift by 6200RPM, set the limiter at 6300RPM and be done with it.

Z28XTC

iTrader: (5)

Will do speed demon but what did KR mean?

DUSTYWS6

KR = Knock Retard

Your car has knock sensors that will pick up the sound of detonation and triggers the PCM to pull timing. The loss of timing reduces HP but saves the engine.

Z28XTC

iTrader: (5)

Thanks