as soon as I hit 135 it feels like my trans downshifts and the car slows then upshifts and soon as I hit 135 it does the same thing but it all happends with in seconds this never happened when It was all stock it only happened after the motor was put in and tranny was rebuilt(motor went 3 weeks after tranny was rebuilt) is there an adjustment of some kind that can be off(other than t/v cable that is set correctly) has this happened to anyone else

I also installed an msd 6A could this have anything to do with it

 

sounds like a revlimiter have the same thing in my rs except it kicks in at 115

 

if you have an automatic then your torque converter could be slipping, or your clutch could slipping if you have a manual.

You go over 135 on a regular basis?

No wonder your tranny and motor blew up within a month of each other lmao .

 

It's in the transmission. You need the Corvette Servo installed. The stock 700R4 transmission will NOT go into 4th gear in WOT (as installed in F-bodies). Some people who own the 1991 & 1992 L98 F-bodies reported their autos will go into 4th in WOT.

My original transmission did not, but it didn't last long either. When I got a warranty replacement, it had the Corvetter Servo installed and it upshifts into 4th in WOT.

This is a VERY common problem. Go to the Transmission Board and do a seach on "Corvette Servo" or "WOT upshift into 4th", if you have no luck, then make a post on "Why won't my transmission upshfit into 4th in WOT". Someone will either answer or link you to one of the millions of posts on this subject.

But it is NOT a speed/rev limiter. Rev & speed limiters work entirely by cutting off fuel. And no TPI engines had a rev or speed limiter to my knowledge (from what I have seen in the proms). The speed limiters are on TBI & LG4 carb 305s (around 120 mph as I recall) and V6s.

 

My stock bin has a rev limiter of 125.

However, I've learned that my ECM is a re-manufactured unit, which is possibly why I have such a screwed up injector constant (20.48). I'm not sure what my ECM is.. hex PROM ID of 0011

 

Look at the silver tag for the BBC, then I can try looking it up. The ECM is not the issue, it is the memcal.

But, if you have a "rev limiter" (it's actually the speed limiter) in the memcal, then you still have the WOT problem in upshifting to 4th. Your transmission would most definitely have that problem.

When you hit a "speed limiter" (I have never actually seen a rev limter set by GM on a 3rd Gen F-body...just the speed limiter), the engine cuts off fuel and stops until the speed of the vehicle falls below and then it starts again. Basically, it feels like someone turned off the engine.

But if your transmission keeps "upshifting/downshifting", that's the servo. And, depending on gearing, it's somewhere around 120 mph (for 3.23s) or 135 (for 2.73s).

 

Haha...oops yeah I meant speed limiter. I haven't tried the rev limiter function to see how smooth the cutoff is. I know with my MSD 6AL on my last car it was nice and smooth.

Yeah, my trans kicks between 3rd and 4th at around 120ish and I have 2.73s. I know I have the WOT upshift "feature" from GM. They did it because the 3-4 clutch pack is supposedly very weak in these transmissions in the stock form. I've been debating the Vette servo (or even that super servo I've seen) but I can't decide whether or not to rebuild my trans or not and just wait til then.

I'll try to find the stock chip. I know I have it around here somewhere. You said the BBC code?

 

well my tranny is built I have a vette servo and added clutches it shifts into 4th at wot always has I have the 3.23s and a hypertech stage 2 chip

who makes the super servo

 

Well, it seems funny that this has happened all of the sudden after you had the engine and tranny rebuilt. I would look in the FAQ to see how to properly adjust the TV cable.

Now have you EVER had it WOT into 4th since you had the tranny rebuilt? I can't comment on the eprom, but I don't believe they leave the any speed limiter in (though we do call it hyperjunk for a reason). And 135 is not the usual speed of a speed limiter...around 110-120 is the typical speed of a speed limiter. Also, if this is the same eprom as before and it never had a speed limiter before, that would eliminate the eprom.

You need to look a the things that were recently changed IF your car never had this problem before.

 

Are you sure your car can go past 135MPH? Your sig only shows a 14.9 pass. If I remember right, I read a heads up comparison between the Firebird, Camaro, and Mustang, and the Bird/Camaros topped out at like 135-138 with the 5spd/305 combo. 5spd/305 combo should run 14.7-14.9ish at the track.

Think your car could just be topped out at 135?

 

maybe its run out of gear/breathe/fuel i dunno lol

 

My car topped out at 125 at 4500RPM in 3rd gear with my 2.73s. That's at WOT which obviously doesn't let me upshift to 4th with my trans.

Since then I've fixed a horrible spark plug issue (terrible gapping) and put a new cat and K&N on and a few other things so I haven't tried it since, but I'm not expecting anything (though it seems I picked up about 5MPH and nearly 7 tenths in the 1/4).

I'm not going to bother trying to top out my car again now with winter coming. I'm just going to wait til I get the intake/heads/cam/headers installed and have another go at it in the spring when the weather gets a bit better. Not a big fan of endangering others or getting caught, so I don't try driving like that very often at all. By then I'll hopefully have a rebuilt trans as well (at least a shift-kitted/servo'd one anyways).

I'll try to remember where I saw the super servo...supposedly MUCH bigger than even the Vette servo.

 

when I had the stock(as far as I know) 305tpi and the trans was already built when I bought it I went 145+ atleast thats what the speedo read not the same eprom but it happened with both I just adjusted the t/v cable the right why its not a new problem it first happened in march of 2002 when I got the 350 running right thats what makes me think it was an adjustment

compairison's are to me I read one about the 350 Iroc-Z and the fox stang GTs and the stangs motor blow at 148mph chasing the Iroc I have a buddy with a stang GT and it does 150mph just fine

every car is different I guess just like my lb9 used to blow 5.0 stangs away

I do my high speed runs at about 3:30-4am with all of 1 car was on the highway

 

My only q is why in the hell do you need to be rolling at 135 on the street in the first place??

 

wait till he gets caught...LMAO...i got a friend that really enjoyed loosing his liscense for 3 years and the beautiful psych evaluation they gave him...LMAO...J/K...but it can happen..

 

at 135+ u got a good lead on any cop that notices you.

 

Yeah but you can't outrun Motorola...

There is no need for that IMO... prolly cause my car isn't geared for it!!

 

the same reason you built a 355

because I can and at 135 the police don't chase you at least the 2 I past before didn't and if they do I WILL get away how do I know because its happened before but I was street racing

and I can save them money on the psych evaluation Im crazy and Im fine with that

 

thats right..LOL

 

Its not the same reason people build 350s. They build them for acceleration, not top speed (well, usually). Most people around here run the 1/4 mile and enjoy feeling the torque rather than tour at high speeds (though it can be fun from time to time....like bashing my dad's ES300 that rides like a boat on the highway and is just plain scary at 115+).

In any case, as mentioned above, you can't outrun Motorola... if a cop sees you going that fast, why bother risking his life to chase you? All he has to do is radio to a cop up ahead and you're done..

 

ya if you were dumb enough to stay on the highway after being spotted, all he can say on the motorola was some white car...


and if your into circle track racing, top speed is just as good as acceleration.

 

I live in sacramento,CA their is no cop ahead they don't sit on the side of the road like in the movies here plus I have a "motorola" (police scanner) when I do my high speed runs and Im about 4miles from my house I live just off the freeway trust me Im smarter than you think

anyway I'll find out the problem and will be doing 145 again

 

Good call...I just meant on for street driving. I completely agree that driving fast is fun and I would enjoy circle track. In fact, my buddy and I wanna hit one one of these days.

As for the police scanner...good call you're ahead of the game then. I've been meaning to pick one of those up..

 

lol actually now that I think about it, my speed limiter was set at 125 and the point to turn the fuel back on was 124...maybe that's why I was limited to 125mph

That and the fact that my speedometer was only a 120mph guage then, now its the 140mph one.

 

my G92 LB9 ran 14.8 with 12 year old dry rotted tires slipping clutch, factory leaking catback...14.1's and 2's after getting it all up to par...but i do drive very aggressivly......mine hit 143 top speed

 

I'm surprised no one has mentioned to check the ratings of your tires. Have one of them blow out at 135 and you're dead.

 

yeah that would suck wouldnt it....

 

driving like that, i dont think so.

 

Nice mention of the circle track stuff... funny that rarely do they even reach top speed... Acceleration is key at those circle tracks other than Daytona and Talladega where their air limited top speed is key.

Any other track and its how fast you can get out of a turn, accelerate faster than the guy next to you into the next, and then out break your oponent... Nice try though...

 

My 86 TA ran mid 15's at the track and would do over 140, more like 145.

Something as simple as a miss could cause a loss in top speed like that.

 

My car hits 178 in 5th, but when I put it in 6th at 178 it starts slowing down. What's wrong with it? Do I need one of those Corvette servo thingies?

 

[QUOTE]Originally posted by ZBRA
My car hits 178 in 5th, but when I put it in 6th at 178 it starts slowing down. What's wrong with it? Do I need one of those Corvette servo thingies?

[/QUOTE?

Ahahahaha... yeah you need a servo... that 5/6 shift must be messed up!!!

 

Chris my car will not shift into 4th at WOT either what is wrong with it?

 

never really thought about that my 265/35/18 are w rated thats 168mph but when I went 145 my tires where s02 and where y rated at 186mph

don't like circle racing that much but I would like to do that high speed race thing I think its the silver state classic or something like that

some of you guys must have tachophobia(most likely spelled wrong) I had my car for 4 years and have done about 3 or 4 high speed runs I don't just drive around doing 100+ all day every day

 

 

All I can add is that 120 in a convertible with the top down is brutal.

I don't recommend it.

Also, this has been spotted a number of times on my speedway:



This car, CHP markings. I-280 and 101: South of Daly City and North of San Jose.

 

hmm 135 runs i don;t think your that smart at all, quite the oposite actully dumb realy.... what hapens when grand ma with her 4 grand children pull out in front of you? what happens when that dear comes running across the road. it wil be nice knowing ya...

don;t be dumb #$4 take it to a track get into auto cross or something safe. the roads were not ment for you to be on them...

 

Sure you can, its been done.

 

I have to interject here.

don't, you're, reaLLy, dEEr, I.
People in glass houses....

 

You missed "opposite" and "actually".

 

There were so many, I just picked a few.
And throw meAnt in there too.

 

I just want to add my 2 cents:

Driving 135mph on any public highway is absolutely stupid.

The only hope I could possibly have is that when you do wipe out and crash; it is only yourself that you kill, and not some poor innocent victim, or even worse a full family of victims. What you are doing is criminal. I see no difference between you, and that idiot who was sitting on the highway taking shots are cars with a rifle last year.

Perhaps our brothers in California do things differently, but that 135mph thing would last a few exits TOPS around here. We'd have you boxed in, face down, and off to jail.

It just amazes me the absolute stupidity of kids these days. I hope to *** someone stops you before you kill someone.

-- Joe

 

i got mad when my car started acting up at 120mph hehe so i just changed transmissions completly :-D t56 hehe....come to find out dead injector rest of em messed up and dead distubtor....hahaahha oh well cars almost back on the road cant wait to top out int hat newly found 5th gear....or cant wait till i can power 6th gear....for a 200mph run

terrel your cars a piece of junk sell it hehe....ill find you a better one...found traviz 13.7

 

thanks for the spell check, but last i checked this is a board and not an essay. but your entiled to it if that is all you have to add to the post


doesn;t change the topic driving that fast on public roads is still stupid, ever wonder why our insurance is so high? Simple....Morons that drive like that on the public roads. Take it to a track you can get the top speed out of it and there will be someone to protect yourself from yourself.... helmets required safety equipement ect....

(feel free to spell check if you like that stuff)

Jeff

 

Actually, its because of all of the uninsured drivers running around.

 

if that was the case all cars would cost the same to insure. rates are based on driving experiance and risk.. all sports cars cost more to insure do to accidents and theft also. my truck cost 800/year and my much older camaro cost 1000.

at least here in mass we get hammered all the time on sports car. even diffrent models in the same class can cost more. like gt model vs le.

 

You missed the point completely. Yes each car is "rated" differently depending on several things. But ALL insurance is higher for ALL vehicles because of uninsured drivers.

 

That varies from state to state. Massachusetts has regulated insurance. Base liability is always the same for any vehicle in the same class.

That rate is than increased or reduced based on driving record.

The state also allows some reductions for things like automatic seat belts, air bags, antilock brakes.

Uninsured motorists do have a slight affect on insurance rates, but it is all regulated through the AG.

-- Joe

 

i find doing the speed limit in the fast lane just retarded, or pulling out infront of someone doing 135 stupid....and if going that fast on a highway is so bad why does the autobahn have a less accident rate, and less death per accident rate??

 

because in Germany it costs thousands to get a driver's license, and extensive training in driving. German drivers do not go 100+mph all the time either, most go about 75-85, not that bad.

Germans are the best drivers in the world and THAT is why there's less accident rate... there's not as many stupid people driving in Germany.