I can't drive 90mph - Defender Source
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  #1  
Old August 6th, 2004, 06:14 AM
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Talking I can't drive 90mph

At least I could not before . . .

Now I am disco cold start chip enabled!

Have not hit the highway yet to see if the speed limiter is disabled, but I can confirm the vehicle runs normally on the disco PROM.

PRM3652 (correct number now!)

I have an updated D90 prom (3665A) if anyone wants to try it out in their D90 or keep their Disco driving wife/kid/self from speeding too much.

Ron
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  #2  
Old August 6th, 2004, 07:23 AM
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Whats involved? I might be interested.
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Quote:
Originally Posted by Lriwater: As you know, most wives don't like Series trucks due to the ride and lack of creature comforts. Girlfriends seem to like those, but some sort of magic happens during the wedding ceremony.
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  #3  
Old August 6th, 2004, 08:16 AM
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First off Ron I really like the Signature , second how do you get the disco PROM, from the dealer? I know allot of D-90 guys would like to know how they can get their larger tired, incorrect speedo, to be able to go past the 75 to 80 mph range.
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  #4  
Old August 6th, 2004, 08:19 AM
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Once the ECU is out (5-10minutes depending on AC panel) about 2 minutes for the swap $35 for the part and a T-15 torx bit screw driver.

Ron

Follow-up Post:

Mike,
Yes I got it from the dealer. PRM3652 (correct number now) Disco I cold start, the PN is in a bulletin.

If you regeared to 4.10 and did not go to some huge tires it will allow you to go at a decent speed.

It will not correct the speedo though. That can be done with the correct output gear on the speedo drive if you really want.

Ron
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  #5  
Old August 6th, 2004, 08:22 AM
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I'll give it try Ron. Might have to wait a couple weeks. Got some stuff going on at the moment thats taking up my free time.
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Quote:
Originally Posted by Lriwater: As you know, most wives don't like Series trucks due to the ride and lack of creature comforts. Girlfriends seem to like those, but some sort of magic happens during the wedding ceremony.
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  #6  
Old August 6th, 2004, 08:24 AM
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Cool only $35 and yu can go faster then 80! I new it wouldn't correct the speedo but Jimmy has 32" tires and his speedo is off by 10 mph and it sucks on the highway when he is trying to follow me and I want to do +80mph.
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  #7  
Old August 6th, 2004, 08:26 AM
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Let me know if you need help. Make sure to ground yourself before doing the swap of the PROM (lick finger and touch something metal).

I am now considering going putting on a set of disco sized tires and lowering it. Make it real zippy (note should probably reconsider this after I get the BMW back from the shop 21 days and counting grrrrrrrr)

Ron

PS the only tricky bit is making sure you get the PROM in the right way. ONe side has a little half circle and one does not. Look at the old one (or the spot where the old one was removed from) and you can line them up. No biggy but it looks like it will go in backwards so make sure to get it right.
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  #8  
Old August 6th, 2004, 01:04 PM
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So let me get this straight. The disco cold start chip keeps the engine as it is but disenables the govenor? Does it have any other advantages? Depending on how you look at it, the disenabled gov. could be a disadvantage. Is gas mileage changed or performance improved? As you can tell I am not very informed when it comes to chips.
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  #9  
Old August 6th, 2004, 01:26 PM
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Barry O'Mahony
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I'm not someone who is against driving fast -- had a Porsche that used to do 130; I know from personal experience. But 90 MPH in a D90? 'sounds like a disaster waiting to happen. The lousy aerodynamics coupled with the compliant suspension indicates things could get real ugly if you have to do anything evasive at that speed.

I really like application-specific machines. Which is why I like the D90 so much: it is so capable off-pavement. But driving it at 90+ on the freeway makes as much sense to me as going mud-bogging in the Porsche.
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  #10  
Old August 6th, 2004, 01:57 PM
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90MPH Ron!!! Geeez! Since I put in 4.10's I struggle to get to 65mph without going over 3500 rpm! Even before with 3.54's the best I could do was 75mph, downhill, with a tail wind!

DJ
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  #11  
Old August 6th, 2004, 02:01 PM
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Jason Herring
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Quote:
Originally Posted by evilfij
Let me know if you need help. Make sure to ground yourself before doing the swap of the PROM (lick finger and touch something metal).
Or you can go buy an anti-static wrist strap and clip it to the body ground for an even more foolproof antistatic system than the old 'wet finger'

I would be interested to know how this affects the power curve and torque curve.

Did you choose the same year Disco to purchase the chip? If so, we can look at the following to understand differences:

1) are the fuel injector sizes different between the 3.9L in the D and the 3.9L in the Disco?
2) how is the intake system different? How much CFM will each flow in comparison?
3) transmission and axle ratios can affect how the engine's power curve should be optimally fit

etc etc.

Quote:
Originally Posted by BarryO
I'm not someone who is against driving fast -- had a Porsche that used to do 130; I know from personal experience. But 90 MPH in a D90? 'sounds like a disaster waiting to happen. The lousy aerodynamics coupled with the compliant suspension indicates things could get real ugly if you have to do anything evasive at that speed.
I think it's more about personal responsibility rather than having an engine with diapers on. So long as the engine is not redlined the thing should not be artifically limitted except by it's driver's discretion, IMO. At 130mph you are definitely not driving at a safe speed in the Porsche in the US, but I'm sure you would not be happy with a chip limitting you to 110mph.

Soon enough our cars will be snitching to the police about our excesses and perhaps issuing us speeding tickets from a printer in our own dashboards if we are not already cut off at the knees by being limitted to the posted speed limit by a quick conversation between our onboard computer, the ECU and a speed limit sign with an RFID chip in it. (Orwellian 1984 doom and gloom, etc).

I for one would not mind a chip that I could tune the power curve for better economy and/or more power.
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  #12  
Old August 6th, 2004, 04:39 PM
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I for one would not mind a chip that I could tune the power curve for better economy and/or more power.

Search the Board. Different results for different years of Trucks. Be thankful you don't have a GEMS system. What a nitemare.

EwS
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  #13  
Old August 6th, 2004, 04:54 PM
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Hi,

I have got specially programmed chips in my Defender 50th (basically a 1997 NAS station wagon) running the GEMS ECU.
It has lifted the speed restrictor and I have driven it to its max. It will go up to about 115mph and it did it with no problems. You could probably cruise at 100 on a good bit of road.

James
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  #14  
Old August 6th, 2004, 06:57 PM
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Holy crap, you guys actually think it is the govenor keeping your trucks from going over 90
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  #15  
Old August 6th, 2004, 08:44 PM
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I gotta agree with David on this one. My stocker gets me over ninety. Got the ticket to prove it.

EwS
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  #16  
Old August 6th, 2004, 10:07 PM
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The speed limiter can be tricked, actually in most cars it can be, you need to be going down hill and floor it, when you hit the limiter keep it floored, as soon as you pass the limiting spot the engine will kick back in (I have done this but not in a 90). And 90mph isn't all that big of a deal, I've done it with rear DS out!
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  #17  
Old August 7th, 2004, 01:24 AM
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90 is the average speed on the turnpike. I kept hitting the rev limiter so I disabled it. The disco is the same as a D90 engine wise. 1994-95 DI cold start PROM.
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  #18  
Old August 7th, 2004, 01:43 AM
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Robert Dassler
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I put a Disco I cold start chip in my 1994 D90 in 1997? or so and have run it for 130K+ miles. I have not noticed any difference in power or fuel economy, however, it is nice on long drives, especially since the speedometer is approximately 10% optimistic. The main reason that the D90s have the speed limiter built in is due to the speed rating on the tires...BFG wouldn't certify the tires for over 90mph and anyone considering doing the changeover should bear this in mind.
Rob Dassler
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  #19  
Old August 7th, 2004, 02:51 PM
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Hello everybody.What is 'PROM" ? And how I can reprogramm my chip?And were chip located?
Thank you
'Vadim
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  #20  
Old August 7th, 2004, 02:57 PM
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Quote:
Originally Posted by Roadsiderob
The main reason that the D90s have the speed limiter built in is due to the speed rating on the tires...BFG wouldn't certify the tires for over 90mph and anyone considering doing the changeover should bear this in mind.
Rob Dassler
I agree there. Forgot to say about that. Make sure your tires have the corect speed rating or they might blow up and that could be disasterous !!!

I have the limiter lifed but also changed to fast road tires.

Best regards

James
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