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Redlining: How bad is it really?
Well, I'm sure we all were in that situation... highway completely empty, already picking up some speed, then hmmm... lets see what this baby can do! Foot down, shifts down, picking up speed like there's no tomorrow! Just wondering, is there any real damage done to the Alloytec on the Executive and the 4 speed auto on PWR when you do that once in while? Putting your foot all the way down, to the point where it shifts up at 6000 rpm?
My VZ Exec is completely stock, and I've only done this twice in the lifetime of the car, nearly 160k on the clock so far. Lol happened to be on the "empty highway situation" today, felt a bit guilty after doing itI love my Commy and wish to keep him for a long time... just love how badass he can get at times haha!
Last edited by tHe_sTiG; 28-05-2011 at 04:36 PM.
The only Exec in Saudi that's now properly badged!
Hand over the dog bikkies
If the gearbox is shifting it's self it's fine and doing what it's supposed to do.
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Blown Alloytec
my sv6 has racked up 160,000km and just took my car into work and did a saftey inspection. the only thing wrong with it is caster rod bushes and shocks. there are reasons why there are limiters on cars, which is to protect them from negligent driving. thats all i have to say.as long as you do regular services and fix problems as theyt appear, there should be no reasons why things would go bad.
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Hehe correct on calling that negligent driving. I happened to see your SV6 0 - 100 km/h run video. Isn't the car supposed to shift at the redline, not after it? Or is it because its the 190, it has a few tweaks over the 175?Originally Posted by richardpalinkas
My car's due for service soon, doubt they'll find anything. Probably only thing they'll do is clean the injectors, skim the brake rotors and replace consumables (brake pads etc) + oil change.
The only Exec in Saudi that's now properly badged!
Hand over the dog bikkies
If the car has a soft limiter which most do it's not such a big deal if you hit it every so often. Every time and you will start breaking things. Cars have an optimum power band and you will find it's often a bit below red line.
Welcome to the internet where people have opinions that you might not like
Big block Alloytec
Delete [post
Last edited by heyitsEnricoPallazzo; 28-05-2011 at 11:15 PM.
Help reduce carbon build up by clearing it.. It's good for the engine... :P
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Hehehe can be true. I remember dad taking his WM Caprice for its regular service one time. They told him they had to clean out his fuel injectors. Asking how they got clogged... they told him he wasn't driving hard enough
The only Exec in Saudi that's now properly badged!
SILVERFOX
I know that it's a different motor, however my owner's manual for my Ecotec says that occasional redlining is not an issue, but constant driving at redline for extended periods, ie: holding throttle to the floor and letting sit at redline, may cause engine damage. (Or words to that effect)
So I would say the Alloytec should be the same?
'Ah well, I suppose it had to come to this.'
Torana Addict
Would be the same for any engine. If you redline it all the time, you'll start breaking stuff, as said above. But now and then shouldn't hurt it.
Also, as above, optimum power usually isn't found at redline, but before it.
Donating Member
If you want to find the power band of your engine do some google searches for dyno sheets or stock, or near stock versions of your car. It wont give you an exact read, but it will give you an idea. Some cars peak very soon in their power.
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That would probably apply to all engines. I suppose a more suitable phrase would be "it would shorten the life of the engine". I'm sure beyond the red line for extended periods is definetely not good, since the engine wasn't designed to handle such loads.
Engine specs for VZ Commodore states: Max power: 175 kw @6000 rpm. So I'm guessing, the redline is either at 6000 rpm or slightly past that.
The only Exec in Saudi that's now properly badged!
Big block Alloytec
Redline for 175 with 4L60E is 5500rpm. Cut-out is 6100rpm.
Torana Addict
^ Mate everytime I see one of your posts with your username and avatar I laugh. I love those movies.
Ok, carry on.
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Strange that the engine would allow itself to go beyond the rev limit. Shouldn't the shift point then be at 5500 rpm?
Last edited by tHe_sTiG; 30-05-2011 at 08:46 AM.
The only Exec in Saudi that's now properly badged!
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Hey guys! After much researching I managed to come across this site. Most of the information is greek to me, but I managed to find what I'm looking for. Might be of interest to some of the modders out there.
http://www.strokerengine.com/StrokedEngines.html
Safe rpm = (3500 ft/min x 6) / (85.6 mm x 0.03937) = 6231 rpm. About 6200 rpm.Here is the rule of thumb. Figure out the piston speed in feet per minute. (stroke X max rpm you want to run,devided by 6) never go over 3500 feet per minute for stock engines, 4000 feet per minute for modified engines and 5000 feet per minute for all out race engines. example, a 4.25 stroke length stroker motor should not go over 5600 rpm for a modified engine.
Max safe rpm = (3750 ft/min x 6) / (85.6 mm x 0.03937) = 6676 rpmUnderstand Stroke Limitations and Piston Speed
There have probably been more stroker motors built in the last 10 years than there were in the previous 90. The proliferation of inexpensive, stronger-than-stock cranks has brought an entry-level stroker kit within almost every hot rodder's financial reach. But there are limitations as to how much stroke can be used. Any time stroke length is increased we either have to accept increased piston/rod accelerations (and therefore loads) or a reduction in redline rpm. For the most part we can calculate about where to set the engine's redline rpm from a given mean piston speed. The formula is simple: Mean Piston Speed (feet per minute) x 6 divided by the stroke in inches. Fig. 1 shows the formula and an example.
Figure 1
Calculating Maximum Safe RPM
Max. Safe RPM = Mean Piston Speed (ft/min) x 6
Divided by Stroke in Inches
Example for a budget aftermarket forged crank in a 4-inch stroke small-block Chevy:
4,800 x 6 = 7,200 rpm
4
Maximum Mean Piston Speeds for Above Formula:
Factory cast-iron cranks 3,750 ft/min
Aftermarket cast-steel cranks 4,500 ft/min
Factory forged cranks 4,600 ft/min
Budget aftermarket forged cranks 4,800 ft/min
Typical race aftermarket cranks 5,500 ft/min
High-dollar custom endurance race cranks 6,000 ft/min
ProStock/Mountain Motors 7,500 ft/min
Formula One 7,500+ ft/min
Going by this method, we could say the max the Alloytec can tolerate before crapping itself is about 6600 rpm. Quite a realistic figure, considering the Alloytec 190's shift point is set at 6500 rpm under full throttle.
The only Exec in Saudi that's now properly badged!
Big block Alloytec
As stated earlier. The 175 is limited by the 4L60E tranny (claimed). Thats why it has a lower cut-out.
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Weather its a manual or auto, the limiter will stop the engine revving any higher. Unless you manage to accidently grab 1st at 100kph, then I'm sure something would go bang
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Yes, that is the sort of problem to worry about. Auto trans would eliminate that problem, seeing everything is electronically controlled. Manual trans, don't get over-excited and shift properly.
Other than that, it seems letting the car stretch its muscles once in a while can be good. Get rid of all that crap that gathers inside there.
The only Exec in Saudi that's now properly badged!
Tells it like it is.
It's a VZ Exec mate - The only badass you are going to get from that is when you meet bubba in your jail cell from getting caught.My VZ Exec is completely stock, and I've only done this twice in the lifetime of the car, nearly 160k on the clock so far. Lol happened to be on the "empty highway situation" today, felt a bit guilty after doing it
To answer your question, hitting the limiter once in a while is unlikely to cause damage. There is always the chance that the associated lean out will cause catastrophic engine failure. Just accelerating to speed and letting the auto do it's job is unlikely to cause trouble.
??? WTF??? They told him wrong. Get a new fuel filter, don't by crappy fuel and get a new mechanic.Hehehe can be true. I remember dad taking his WM Caprice for its regular service one time. They told him they had to clean out his fuel injectors. Asking how they got clogged... they told him he wasn't driving hard enough
RPM where there is peak power & the rev limit are two different things.
Unlikely the manual would go into gear unless you are very unlucky. If it did go in be prepared for a massive compression lockup.
Yes burning out the cobwebs once in a while is good for the motor. Bouncing off the limiter should be avoided.
Reaper
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Thanks for the thorough reply Reaper.
For me, the Exec is plenty. Being my first car, I really consider it my precious, love and appreciate everything about it. Normally I drive defensively and responsibly. Contrary to what others say, I find the occasional burst of power a real treat, within speed limits ofcourse. The acceleration is great and the handling is top-notch. It feels like a sports car. Such strong features in terms of performance, and its still a very practical and family-friendly car. That's what I love about it.
The carbon build-up in dad's WM could be because of filling up with 91 octane instead of 95. Will let him know about that.
What does bouncing off the limiter mean?? When driving a manual, foot down in say 2nd gear, and not shifting into 3rd when needle bounces up and down at 6000 rpm?
The only Exec in Saudi that's now properly badged!
pretty much... its why when you see burnout videos you'll hear the "bah bah bah" sound and then if the bloke driving is retarded sometimes your rewarded with the engine blowingWhat does bouncing off the limiter mean?? When driving a manual, foot down in say 2nd gear, and not shifting into 3rd when needle bounces up and down at 6000 rpm?
im not talking about the "professional" burnout comps but those videos of retards on a back road in a shitty looking vl
captain halfajob
lol, you need to drive a few sports cars
+1 lollol, you need to drive a few sports cars
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