ZL1 Rev Limit - Stock Calibration

[Flavorwrench]

Originally Posted by JED

Been shifting for 45 years, tachs are great but the sweet spot is the sweet spot. I can feel the spot coming and it's gonna be right about 6250-6300 !
Love the damn car but I would kill to have a 6500 rpm limiter without having to do a full, blow the warranty, tune.....frustrating.

BTW.. great info on this site, saved me a ton of time and cash, can't thank everybody enough. Speaking of warranties, some of the muscle cars I was buying new back in the day came with 90 day /3000 miles....and they gave you NO SLACK !

Add a cam and run 15.5lbs of boost and let me know where that sweet spot is in first and second gear, I'll even give you some more head room with spark cut at 7800 RPM :-)

[Blueclyde]

Originally Posted by 376LS3

Dont worry about what the tach says. Listen to the engine. It will tell you when to shift.

No, it really doesn't.

[jon6.0]

The engine tells me to shift after the damn rev limiter. It's still pulling hard by the time it kicks in. If I'm not watching the tach I bang into it. The stock engine really needs a 6500 limiter. Once I start modding that will be fixed. I shifted my supercharged LS3 at 7000 with good BTR dual valve springs. Power peaked at 6600 with that combo.

[hognutz]

I have my limiter at 6500 and the car still pulling pretty hard to that.

having my limiter set there though I only hit it every once in a wile. I really struggled with the stock setting any loss of grip it first and I would tag the limiter.

this is why I can see why stock vs stock the GT500 crowd loves that car. 7k rpm, 600whp. I love the handling of this car the stock power band pissed me off at times. it is such a different car with 12psi and 6500rpm limiter. this takes all of 2 hrs to do and does not cost much.


I think tha was my only pet peeve with the Zl1. the motor has tons of potential but unlike my LS7 which I was happy with stock (need more a drive mod that power mod) this setup I need to tweek a bit to be happy.

[jon6.0]

Originally Posted by hognutz

I have my limiter at 6500 and the car still pulling pretty hard to that.

having my limiter set there though I only hit it every once in a wile. I really struggled with the stock setting any loss of grip it first and I would tag the limiter.

this is why I can see why stock vs stock the GT500 crowd loves that car. 7k rpm, 600whp. I love the handling of this car the stock power band pissed me off at times. it is such a different car with 12psi and 6500rpm limiter. this takes all of 2 hrs to do and does not cost much.


I think tha was my only pet peeve with the Zl1. the motor has tons of potential but unlike my LS7 which I was happy with stock (need more a drive mod that power mod) this setup I need to tweek a bit to be happy.

I agree. What sucks is you have to ditch the powertrain warranty to get it.

[jessrayo]

Originally Posted by ZO6 Bryan

That's because it is set up in the tune to limit by fuel cut in 1st-4th gear then limited with ETC in 5th. And again with fuel cut in 6th, as if you could reach 6200 rpm in 6th.

Actually when I had the 3.73 rear gears and the ZR1 corvette gears 5 and 6 the top speed of the car was only around 205 so it would hit that with a hard cut-off also. I have not been to the limiter in 6th since I changed rear to 3.23 and my new transmission ratios give me even more top end potential...

[ZL1#216]

When you raise the rev limit, do the shift timing lights on the HUD and the no lift upshift match the new setting?

[376LS3]

Originally Posted by Blueclyde

No, it really doesn't.

Then you dont know what you're doing.

[jessrayo]

Originally Posted by 376LS3

Then you dont know what you're doing.

When we were data logging the mile I had my limiter pushed to 7000 and with 1200whp worth of mods on the car the tach is the only way to know when to shift. It continued to build power right to the point it cut fuel (or the throttle body would flutter) and if you shift early it cost a few mph down the track.

I'm sorry but look at 90% of the dyno sheets on these cars and none of them go flat. That means there is no perceivable change in power right up until the fuel is off and by the time you register your car is slowing down and then bang a shift....it is slower.

[Blueclyde]

Originally Posted by 376LS3

Then you dont know what you're doing.

Not sure why you are offering any comments since your comments add no value at all to the discussion here. If you own an SS, which I assume per your sig, you have no reference point. I owned 2 5th Gen SS's prior to my ZL1's and neither did this. Please either add value or don't comment.

[Blueclyde]

I still can't seem to make sense of what I am experiencing. I performed a data log the other night. I'm not sure if I'm actually hitting the rev limiter. It may be the traction control system, but I'm fairly certain I have it turned off.

I'm hearing what I perceive as the rev limiter in the exhaust. It sounds like fluttering or misfire, but I know it isn't misfire. The data log shows the throttle dropping from 83% TPS to 50% TPS without any change in Accelerator pedal input. It looks like the controller is pulling the throttle back.

I am turning the traction control off by holding down the PTM button until both indicators are illuminated on the dash. I have to hold the button down for 5-7 seconds to do this.

Does the traction control system pull the throttle back?

[jon6.0]

You can try having the dealer reflash the car.

[jessrayo]

Originally Posted by Blueclyde

I still can't seem to make sense of what I am experiencing. I performed a data log the other night. I'm not sure if I'm actually hitting the rev limiter. It may be the traction control system, but I'm fairly certain I have it turned off.

I'm hearing what I perceive as the rev limiter in the exhaust. It sounds like fluttering or misfire, but I know it isn't misfire. The data log shows the throttle dropping from 83% TPS to 50% TPS without any change in Accelerator pedal input. It looks like the controller is pulling the throttle back.

I am turning the traction control off by holding down the PTM button until both indicators are illuminated on the dash. I have to hold the button down for 5-7 seconds to do this.

Does the traction control system pull the throttle back?

Wow. That is exactly what was happening to me at the texas mile. I attributed it to throttle body flutter but now I'm wondering if it was traction control. Yes traction control closes the throttle body.

My car is in the shop again but I would be very interested in having you pull engine compartment fuse 40 and do a data log run again with the fuse out. This is main traction control fuse.