speed limiter?

**slpdablueZ28** · 11-06-2008, 07:31 PM

is there a such thing as a factory speed limiter installed in our cars? cause i heard that on some american cars they shut off after a certain speed. i think a similar thing is a rev limiter on european cars sold hear? or so i heard

**thearborbarber** · 11-06-2008, 09:39 PM

My 99 Z28 came with a speed limiter of 160mph from the facotry.

**mark21742** · 11-06-2008, 10:14 PM

my old 90 z24 cut out at 115 mph then wouldn't kick back in till it dropped down to 105 mph

**LS1Powerhouse** · 11-06-2008, 11:48 PM

Cars that came with Z rated tires didn't have one... I think it just shut the fuel supply off when you reached a certain RPM in your final gear.

Cars without the Z rated tires (V6's and some Z28s) had a limiter... Not sure on the exact speed... But I think it's around 115?

**ls1camino** · 11-07-2008, 12:11 AM

Check out this thread:

http://www.ls1.com/forums/showthread.php?t=99818

**mark21742** · 11-07-2008, 12:17 AM

I'm pretty sure all newer cars come with factory rev limiters. most of the small 4banger imports don't need a top speed limiter because their lower power output makes them hit a (brickwall) as far as top speed. (resistance works as the limiter) but most of the larger displacement/ hi output imports still run topspeed limiters
ls1powerhouse is right the "rev limiter" for us is a rpm set fuel cutoff

**Spaz** · 11-07-2008, 04:46 AM

yes... they are speed limited through the PCM... i believe the cut off is 162mph...

**LS4U2NV** · 11-07-2008, 05:41 AM

there are both speed limiter stops your car at a certain speed. most sports cars are around 140 to 165 trans am , vettes, camaro, etc....
rev limiter stops your rpms at a certain range so you dont hurt the motor or warranty issues such as stock our trans ams stop at 6 grand but with a tuner or tune i have mine at 6600 and thats mild could do more

**mark21742** · 11-07-2008, 06:03 AM

Originally Posted by LS4U2NV

there are both speed limiter stops your car at a certain speed. most sports cars are around 140 to 165 trans am , vettes, camaro, etc....
rev limiter stops your rpms at a certain range so you dont hurt the motor or warranty issues such as stock our trans ams stop at 6 grand but with a tuner or tune i have mine at 6600 and thats mild could do more

just a warning, with stock valve springs you can run into valve float as low as 6,200....i have mine set at 6,100 just to be safe

**LS4U2NV** · 11-07-2008, 06:21 AM

i set mine from my handheld. at the track i use very aggressive 6600. for street and everywhere else i keep around 6200 unless taking a race but thanks

**slpdablueZ28** · 11-07-2008, 06:30 AM

ok cause ive taken it up to 125 but didnt really know how high i could go before it would kick in. so im basically good till around 160? is there any problems to the car if it kicks in? or it just causes u to slow down and the car starts working again normally?

**LS4U2NV** · 11-07-2008, 06:36 AM

oh you will be able to tell when both the rev limiter and the speed limiter kicks in. you have a z28 so i dont think it kicks in till about 155 or 160. so i think you will be good. all it will do if you do get there is you will feel you car jerk a little bit for you to know to let you foot off the pedal it wont let you pass that speed unless you get a handheld or tune to stop all limiters

**slpdablueZ28** · 11-07-2008, 09:13 AM

word, thanks for the info guys

**Frost** · 11-07-2008, 10:06 AM

Originally Posted by LS1Powerhouse

Cars that came with Z rated tires didn't have one... I think it just shut the fuel supply off when you reached a certain RPM in your final gear.

Cars without the Z rated tires (V6's and some Z28s) had a limiter... Not sure on the exact speed... But I think it's around 115?

No, convertibles have a low cutoff; like 112, most everything else is 160.

Don't confuse RPM based rev limiters with the speed limiter; they are different as well.

To the poster spinning his stock sprung setup to 6600; not only is that WAY past your power band, but you are in serious engine jeopardy territory. As noted; stock springs float very low; much lower than 6600.

**Spaz** · 11-07-2008, 10:19 AM

with the acception of my LS6...

i can rev a bit higher...

**NightRiderZ** · 11-07-2008, 12:14 PM

Yeh ive got my 98 up to around 152 and let off, was at around 6100rpm ( A4 )

**mark21742** · 11-07-2008, 02:14 PM

Originally Posted by Frost

No, convertibles have a low cutoff; like 112, most everything else is 160.

Don't confuse RPM based rev limiters with the speed limiter; they are different as well.

To the poster spinning his stock sprung setup to 6600; not only is that WAY past your power band, but you are in serious engine jeopardy territory. As noted; stock springs float very low; much lower than 6600.

got all my rev limit and valve float info from you man

**twozs** · 11-07-2008, 02:29 PM

thats what Ive heard also the cars that came with z rated tires were set at 160 and non z rated tires set at 115. not all z28s came with z rated tires. all ss models did tough

**ls1camino** · 11-07-2008, 08:30 PM

Originally Posted by Frost

No, convertibles have a low cutoff; like 112, most everything else is 160.

Don't confuse RPM based rev limiters with the speed limiter; they are different as well.

To the poster spinning his stock sprung setup to 6600; not only is that WAY past your power band, but you are in serious engine jeopardy territory. As noted; stock springs float very low; much lower than 6600.

My buddy has had his SS Vert up to 160 (top down too)...he was right behind my Trans Am