Looking to get past the speed limiter... - Defender Source
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  #1  
Old June 28th, 2012, 07:35 AM
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Paul Koentges
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Looking to get past the speed limiter...

Looking to get past the speed limiter...swap ECU or change speedo gear? Other options?

-95 ST; 285's 4:14's; speedometer is about 15 mph off +/-. In a perfect world, my preference would be accuracy...

posted: "If it is a 95 or 94 get an ECU from a Classic 3.9 that will take care of the 90mph limit".

I have spare classic ECU's, any downside to swapping, particular year?

thanks
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  #2  
Old June 28th, 2012, 11:34 AM
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Quote:
Originally Posted by PMKColorado
Looking to get past the speed limiter...swap ECU or change speedo gear? Other options?

-95 ST; 285's 4:14's; speedometer is about 15 mph off +/-. In a perfect world, my preference would be accuracy...

posted: "If it is a 95 or 94 get an ECU from a Classic 3.9 that will take care of the 90mph limit".

I have spare classic ECU's, any downside to swapping, particular year?

thanks
Why would you want to do 90 in these trucks? I think there are chips that will remove the speed limiter.
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  #3  
Old June 28th, 2012, 12:22 PM
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The downside is that you may be able to do more than 90 mph.
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  #4  
Old June 28th, 2012, 01:55 PM
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But if his speedo is off by 15mph, that could be 75..... not 90.
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  #5  
Old June 28th, 2012, 02:26 PM
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Quote:
Originally Posted by PMKColorado View Post
Looking to get past the speed limiter...swap ECU or change speedo gear? Other options?

-95 ST; 285's 4:14's; speedometer is about 15 mph off +/-. In a perfect world, my preference would be accuracy...

posted: "If it is a 95 or 94 get an ECU from a Classic 3.9 that will take care of the 90mph limit".

I have spare classic ECU's, any downside to swapping, particular year?

thanks
change the speedo drive gear ... accurate speedo and the limiter at the proper value.
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  #6  
Old June 28th, 2012, 02:36 PM
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You should do both.

A disco or RRC ECU or even just the PROM will get rid of the limiter.

No downside to swapping. As long as it acts fine, it is fine. Some ECUs have different mounting brackets which is a bigger deal on a 93/94, but on a 95 under the seat, who cares.
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  #7  
Old June 28th, 2012, 03:30 PM
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Years ago we were all putting the (if I remember correctly) the "cold start" prom in the earl trucks. They raised the richness of the fueling a bit, but also got rid of the speed limiter.
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  #8  
Old June 29th, 2012, 07:38 AM
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Paul Koentges
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Thanks...what color speed gear is needed? I have searched and only found one option...easy enough to replace, but want to get the correct gear.
As for driving past 90...it actually is about 75. I find it to be unnerving or even dangerous while trying to pass someone site seeing at 65 on a 75…just when I spot the checkered flag…ahhh! 75 is just about the right speed/comfort zone driving CO mtn hwys…
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  #9  
Old June 29th, 2012, 08:18 AM
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Paul- maybe its easier than that...my 95 used to fly way past 75...i think the fastest was 85-90...level ground of course, but still. Maybe a tune up is the problem?
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  #10  
Old June 29th, 2012, 10:28 AM
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Paul Koentges
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(Clarification) D-90 runs great. Larger tires and change in gearing results in both the odometer and speedometer to be incorrect. Changing the speedometer drive gear size can bring both back close to stock (265 tires & 3:54 diffs). The 90's have an electronic speed limiter which cuts fuel at about 90mph as recorded by the speedometer and controlled by the ECU (engine dies). Just changing the ECU will not solve the error in actual speed or distance driven.

-Drive gear: what size is needed or available to resolve the above.
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  #11  
Old June 29th, 2012, 11:53 AM
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Charles Galpin
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Paul, I think you are the right track. I don't know offhand how to calculate what size gear needed, or where to purchase them, but I need to do the same (my difference is closer to 5mph over at highway speeds though).

I found this, and assume we both want the most aggressive one (red) since there are only 5 options it seems, but it would be nice to do the math first. But for you I think it's a safe bet

http://forums.lr4x4.com/index.php?sh...do+drive+gears
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  #12  
Old June 29th, 2012, 10:10 PM
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Quote:
Originally Posted by cgalpin
Paul, I think you are the right track. I don't know offhand how to calculate what size gear needed, or where to purchase them, but I need to do the same (my difference is closer to 5mph over at highway speeds though).

I found this, and assume we both want the most aggressive one (red) since there are only 5 options it seems, but it would be nice to do the math first. But for you I think it's a safe bet

http://forums.lr4x4.com/index.php?sh...do+drive+gears
I replaced my Speedo gear last year with a similer set up. I need to check my wotk email tp get you the right color gear.

------ Follow up post added June 29th, 2012 11:11 PM ------

Quote:
Originally Posted by lordhelemt

I replaced my Speedo gear last year with a similer set up. I need to check my wotk email tp get you the right color gear.
will send you a note Monday.
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  #13  
Old August 4th, 2012, 03:40 PM
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Originally Posted by lordhelemt View Post
I replaced my Speedo gear last year with a similer set up. I need to check my wotk email tp get you the right color gear.

------ Follow up post added June 29th, 2012 11:11 PM ------



will send you a note Monday.
Paul,

I'd appreciate the info also. I've got the same speed limiter problem with 4.11s and 33" tires.
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  #14  
Old August 5th, 2012, 11:30 AM
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Hmm, interesting. I always thought mine was an engine rev limiter - cutting in at 4000rpm in any gear. Perhaps there are both road and engine speed limiters?
FWIW, I run 33s with 4.11s and a programed VDO speedo.
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  #15  
Old October 4th, 2016, 09:38 AM
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Can anyone confirm that red is the right one for 4.11 (ish) and 33" (255/85-16) Tires..


also copying the part numbers for reference here


90/110 speedo drive gears
frc3310 blue --------- 20 teeth -- 7.50,235/85 or 255/85 tyres 20D & 22D transfer box
frc3311 green ------- 21 -- all 90 vehicles excepth the 50th ann edition.
frc3312 yellow ------ 22 -- 90 with 205 x 16 tyres
frc3313 red ---------- 24 -- 32D transfer box

Discovery 1 [200Tdi/V8]
frc3310 blue ------- 20----diesel
frc9339 ------------- 23----[see note]

frc3310 blue ------- 20 ---- V8 efi
frc9339 ------------- 23 ---- V8 twin carb

Note frc9339 diesel for gulf states vehicles,no colour code listed, auto trans Tdi vehicles
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  #16  
Old October 4th, 2016, 11:22 AM
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I'm running the D1 23 tooth gear, FRC9339, in my 90 with 4:10s.
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  #17  
Old October 4th, 2016, 04:20 PM
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Wrote about my ECU swap here for my 94 NAS D90

My understanding is that the speedometer itself has no input on your limiter... your ECU gets the speed data from the speed sensor in the LT230... someone out there smarter than me, please correct me if I'm wrong, but if you only get an adapter to make your speedometer read correctly, you'll be happy that your mileage and speeds are correct...

but then you will experience the ECU speed limiter at 75 mph indicated on your speedometer... instead of 90mph.

Pretty sure you'll have to do BOTH a speedo adjustment/upgrade AND an ECU upgrade if you want to hit those speeds on the highway.

Am I wrong? I could be wrong. Tell me I'm wrong.
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  #18  
Old October 4th, 2016, 04:24 PM
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Quote:
Originally Posted by Nooner View Post
My understanding is that the speedometer itself has no input on your limiter... your ECU gets the speed data from the speed sensor in the LT230... someone out there smarter than me, please correct me if I'm wrong, but if you only get an adapter to make your speedometer read correctly, you'll be happy that your mileage and speeds are correct...
The vehicle speed sensor is a box in the middle of the speedometer cable.
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  #19  
Old October 4th, 2016, 05:13 PM
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Dam, there's a speed limiter on my truck?
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  #20  
Old October 4th, 2016, 06:02 PM
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Robert Lynch
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been researching this today some - The RRC ECU has the speed limiter set at 102 mph i believe (Or 120 mph depending on the version)
The Defender its 90 mph

so... that Leads us to the next steps (thinking 4.10 ish gears and 255/85-16 tires)
23 tooth Speedo wheel to correct the speed/odo &
RRC ECU with increased cut off... should allow for 80-90 mph actual top end.

or an Eprom flash (not sure who) - which eliminates the limiter as your only options.

Correct me if i'm wrong here - just trying to get my ducks in a row before i start re-gearing stuff this winter.
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