100+ MPH Question

[cblackb]

Ok so yesterday I was in the process of demonstrating to the hapless owner of an "official pace truck" Dodge 1500 just how slow his truck really is. It was going splendidly and I was watching his little truck disappear into my rear-view when my truck starting doing something it has never done before. I'm not sure how fast I was going but I'd been pegged on 100 for maybe 5 seconds or so, so I figure I was going about 110 or 115 maybe. What happened is my wastegate started popping open in rapid succession like "psssh pssssh pssssh" in very steady pulses. I immediately got out of it and slowed down. The truck drives totally fine. Is this just some type of speed limiter in the stock computer? I'm running all stock turbo and wastegate and the wastegate is hooked up. Any help would be appreciated, thanks!

[bigcountrysg]

Originally Posted by cblackb

Ok so yesterday I was in the process of demonstrating to the hapless owner of an "official pace truck" Dodge 1500 just how slow his truck really is. It was going splendidly and I was watching his little truck disappear into my rear-view when my truck starting doing something it has never done before. I'm not sure how fast I was going but I'd been pegged on 100 for maybe 5 seconds or so, so I figure I was going about 110 or 115 maybe. What happened is my wastegate started popping open in rapid succession like "psssh pssssh pssssh" in very steady pulses. I immediately got out of it and slowed down. The truck drives totally fine. Is this just some type of speed limiter in the stock computer? I'm running all stock turbo and wastegate and the wastegate is hooked up. Any help would be appreciated, thanks!

I do not see any chip, or programmer in your signature. There for I would have to believe what happened was is your speed limiter kicked in. Get a custom chip like ts-6 or dp tuner, tony wildman, or another quality one and you will not have that problem no more.

[cblackb]

I see, ok good, at least nothing is wrong w/ the truck, thanks for the response!

[TwinTurboStroker]

Originally Posted by bigcountrysg

I do not see any chip, or programmer in your signature. There for I would have to believe what happened was is your speed limiter kicked in. Get a custom chip like ts-6 or dp tuner, tony wildman, or another quality one and you will not have that problem no more.

, but keep an eye on the Tach and your temps when you get going that fast though

[bigcountrysg]

Originally Posted by cblackb

I see, ok good, at least nothing is wrong w/ the truck, thanks for the response!

I bet your truck kinda jerked a bit too. The noise you heard was the waste gate opening when the truck speed limiter kicked in and defueled the truck until it got down below the speed limiter setting.

[cblackb]

Yep I agree, that's exactly what happened. I don't drive that fast hardly ever, usually I let off around 85 maybe 90 when I'm playing w/ it but I was having too much fun blowing this guys doors off.

[lilredpowerstroke]

You don't have a chip or programmer and you still went over 100 mph. I don't believe it. The factory speed limiter is set at 94. When you hit the limiter it doesn't do like gas engines where it starts and stops. On our engines the computer gives just enough fuel to hold it at 94. So without something to turn the limiter off how can you go over 94????

[TwinTurboStroker]

Originally Posted by lilredpowerstroke

You don't have a chip or programmer and you still went over 100 mph. I don't believe it. The factory speed limiter is set at 94. When you hit the limiter it doesn't do like gas engines where it starts and stops. On our engines the computer gives just enough fuel to hold it at 94. So without something to turn the limiter off how can you go over 94????

He could have bigger tires on it, maybe....

[bigcountrysg]

Originally Posted by lilredpowerstroke

You don't have a chip or programmer and you still went over 100 mph. I don't believe it. The factory speed limiter is set at 94. When you hit the limiter it doesn't do like gas engines where it starts and stops. On our engines the computer gives just enough fuel to hold it at 94. So without something to turn the limiter off how can you go over 94????

My speedometer would go to 100 and then my truck would do the same thing. Just because the speedo says your doing 100 does not mean your actaully going that fast. If you change your tire size that will throw off the speedo. There are alot of factors that are involved. I know when my speedo would hit 100 mph before I put my chip in my truck it would act the same way. Does that mean I was actually doing 100 no.

That is why I posted that it was his speed limiter kicking in and making his truck act like that.

[cblackb]

Well, all I know is that I'm running stock sized tires and I've had my truck up to and over 100 a few times. In fact yesterday when this happened it hit 100 and certainly was still pulling hard and finally after about 5 seconds or so it hit the ceiling. I'm fairly certain that I've got a stock computer HOWEVER, the previous owner must have done something because there is a big sticker on my computer box that says "Diablosport" and picture of a Devil. I'm pretty sure it's stock though (or the existing chip is in stock mode?) cause I can't make smoke no matter how much I try. I've been meaning to pull it out sometime and look at it I just never have gotten around to it.