car coughs at 110mph

[2MuchFun]

hey guys had my car out today on the interstate, some VW jetta was TRYING to keep up w/me.......anyway i noticed when i got to 110, the z coughed, dropped a few rpm, maybe 50-100 then came back up, then did it again, then i backed down to 90.......any ideas why it did that??

i dont have it up very high often, though last weeked it did the same thing......

[2001NBMZ28]

Not sure how accurate the speedo is that high - my guess is the car may not have come with Z rated tires and you're hitting the speed limiter? Thinking the non-Z rated cars were limited to something like 112-115? Look at the tire information on the drivers side door.

[2MuchFun]

it came with t rated tires......its got better tires on it now.......so have to get a programmer to change the speed limiter?????

[2001NBMZ28]

Yeah it's in the PCM. Limiter is easily removed with programming. If you don't want to buy one a shop can do it.

[ss~zoso~ss]

FUEL CUT

you have to remove the limiter

[2MuchFun]

lol thanks guys, now i know theres nothing wrong......i will look around and find someone that will do it for really cheap or free....

we dont need some v-tak beating a LS1 on topend now do we??

[wheelszzz]

Had my up to 135 mph once. Man I was shaking alittle when I came back down. LOL


Larry Rodriguez
Northern New Mexico
2002 Trans Am
13.7 quarter mile time

[yellowv]

If I'm not mistaken only the LT1 cars had the limiter w/ non Z rated tires. I am pretty sure my 98' Formy didn't come with Z rated rubber and it pulls well over 112 easily.

[astyles]

i've hit 145 pretty easy in mine,but i dont know if 01's had the limiter

[0rion]

If I'm not mistaken only the LT1 cars had the limiter w/ non Z rated tires. I am pretty sure my 98' Formy didn't come with Z rated rubber and it pulls well over 112 easily.

my 98 formula had z-rated tires on it.

[2MuchFun]

it runs strong till the limiter kiks in.......dunno maybe someone reset it to a lower limit.....guess it is GOOD FOR ME to only be able to go 110 anyway LOL

[Frankthetank]

its ur rev limiter (Speed limiter).....
My 98 z had the same thing....mine would do it at 115........

[LS2Tuner]

its ur rev limiter (Speed limiter).....
My 98 z had the same thing....mine would do it at 115........

Yes it's the stock PCM speed limiter.

You'll need to remove it to cruise at 120 mark......

[02WS6dream]

so...i've been 135 or so in my 2002 ws6 several times--so curious-does that mean that the speed limiter has previously been removed, or is there a difference between years, or models???? experienced speed limiter in both pontiacs before this (grand prix's) and never in this car.

[redbirdws6]

It depends on the tires your car came with from the factory, some of the Z's and T/A's had a lower speed rated tire so they set the limiter lower on those models.The Z28ss and WS6 came with high speed tires and handling packages so they were able to handle the higher speeds therefore your limiter was set up to cut in untill higher rpms. I ran mine out about a month ago in 4th gear to aprox. 140, the rev limiter kicked in at red line and I shifted into 5th and never did see the rev limiter again cause she was doing all she could do which is 156. But all of them came with rev limiters,not speed limiters.hope this helps.

[ixlr8nxs]

I know my stock 2000 Z28 will hit 135. Friend of mine is a cop and he and I were playing when I went to visit them. A lot of long abandoned roads up in West Virginia...lol., It does have the Z-Rated tires

[CDS98Z28]

i dunno how fast i was goin but the speedo stops at 155 and i was still going...took a while to slow back down