I have an '89 RS Camaro with a 305 TBI. I just purchased a Stage 2 jet performance chip. And I thought that would get rid of my top speed limiter. But it didnt. My car stops accelerating in 3rd gear at 4,000 rpms. Is there any way to get rid of this so I can hit top speeds?

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I have an '89 RS camaro

 

Check out the PROM board. You can use TunerCat software and a PROM programmer to recalibrate the speed limiter set in the PROM. A cruder method would be to install a switch in the VSS wire to the ECM and open the switch when you want to exceed the speed limiter set point.

Tim

 

I dont have any prom recalibrater tools. Would I be able to have a shop do this kind of work? Where could I get these tools?

 

OR, you could get funky with the cheese whiz and use a double throw switch on the VSS wire to the ECM. Once side as stock, and on the other one, oh, i don't know, maybe a divide by 2 counter. Then you wouldn't even throw a code, but you could return to stock for stuff like normal TCC lock-up points, etc. You see, an absolute cut off will throw a code pretty soon. As a WAG, i don't think the ECM would notice a divide by 2 counter as long as you didn't use it extensively during slow commuting.
You know, i may build this tonight. I absolutely hate driving up the highway with freaks trying to race me, only i can't cuz my vert has a 105 limiter on it.
then again, maybe not, i promised i'd stop frankensteining this car and just start burning proms for it.
...ed

ps...If you wanna get really trick you could add some logic and a clocked counter to automatically engage this. Of course if you were getting that deep into designing stuff, you could also build a 5/8 divider that would automatically switch on at the same time for the speedo, so your kph would now be your mph.
Or even better, maybe *I* should start building these devices and selling them for low cost. I wonder how much interest i could get for that. Hmmm, i've given away the whole design in this post, but i'm sure there are enough people around here who wouldn't know how to apply it anyway...and for a small fee, why not pay me to build it. But that then gets me back on the road to designing a line of digital guages in custom enclosures....damnit, i have too many ideas.

 

IF you want... I'll re-burn your JET chip for you and remove the 110 mph top speed limiter. Email me..

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92 Z28 5.7
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Ported stock heads, XR270HR-10 cam, TES headers
Crane AFPR, Flowmaster catback, MSD ignition
#24 SVO injectors, 1LE aluminum driveshaft.

Best ET 13.3@107 mph

Click here to see my car at Truspeed.org
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hey Blade those are some sweet pics. I noticed your white face gauges. Those are awesome where did u get them? Also once I get my limiter removed I want to install the 145 MPH speedo as well. Where would I go to get one of those and how hard would it be to install and recallibrate. What Blade has is what I have been looking for!!!!!!!!Check out his links to his picks

 

just movin it up to the top

 

Hey, Ed, I designed that for my '84 Berlinetta with a digital dash - it normally flashes @ 85 mph, so the circuit engages KPH above 84 mph & scales the pulse train such that the readout is in MPH. Above 135 mph, it reverts back to MPH & divides the pulse train by two & reads MPH/2.

Tim

 

You have actually had your Berlinetta past 135 MPH while driving down a public road???

 

Yes........I-10.

Tim