my 180MPH speedo - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

rrobe99999 · 12-09-2003, 10:27 AM

I Finally have an accurate speedo, and it goes up to 180MPH (at least theoretically since the car won't go that fast). I thought I would share this solution to my speedo probs. When I bought my car with the SR already installed, The speedo didn't work. I hooked up the speed sensor, and got 2X readings. I swapped in the JDM gauge cluster and still got 2x readings (now in KM). I wasn't sure which speed sensor I needed (OBDI vs OBDII?), so I bought a speedo calibrator from Canadian Automotive Instruments. This electronic device connects inline with the VSS signal, and alows you to set your calibration factor with dip switches. I dialed in a factor of 0.3123 which compensates for 2X readings, KMH to MPH, and my 17" wheels. This was a pretty easy solution and cost $140 shipped. If I hadn't already cut the VSS signal to my ECU, this would have bumped my speed limiter to around 170MPH. I'll post my top speed, when I get a safe chance to open her up.

Flybert · 12-09-2003, 11:58 AM

Your gearing or lack of power is what's going to top you out if you don't have a speed limiter.

Do it at late at night when nobody is around and I hope those tires have a good speed rating on them. And make sure the road is flat as hell or else you might catch some air and kill yourself.

MadChild · 12-09-2003, 12:41 PM

Having the SR running at such a high RPM to get your top speed, would not be such a good idea. You realize how long you going to have to hold it in about 5000 in 5th gear. In 5th your power most likely topped out already, and you going to have to push the sucker hard.

ge0man · 12-09-2003, 03:53 PM

video

old_s13 · 12-09-2003, 04:05 PM

Quote:

Originally posted by MadChild
Having the SR running at such a high RPM to get your top speed, would not be such a good idea. You realize how long you going to have to hold it in about 5000 in 5th gear. In 5th your power most likely topped out already, and you going to have to push the sucker hard.

HA! And what are you worried about? I say you push till the car can no longer push! I did that several times with my KA, top speed is about 140 (with speedometer calibrated and converted to 180mph).

Glad to see I am not alone in doing such modifications!

Be safe and make sure your car is maintained and running smoothly before attempting your high speed runs though.

- Mike

Bill Roberts · 12-09-2003, 10:37 PM

5900 in 5th is all I could ever do period......and the speedo was in the hole..

I guess I was running around 143 give or take..

zero.counter · 12-09-2003, 10:54 PM

Quote:

Originally posted by Bill Roberts
5900 in 5th is all I could ever do period......and the speedo was in the hole..

I guess I was running around 143 give or take..

Bill, I sent you a PM.

knghtryde · 12-10-2003, 09:55 AM

Drop a Z32 TT gear box on your Bell housing, and a Z32 TT rear VLSD. Trust me with that set up you can get some serious top end power out of either the KA or SR depending on power modifications. You might actually be able to pick up some serious speeds.

12-09-2003, 10:27 AM	#1
rrobe99999 Zilvia Member Join Date: Jul 2003 Location: Destin, Fl Posts: 262 Trader Rating: (0) Feedback Score: 0 reviews	my 180MPH speedo I Finally have an accurate speedo, and it goes up to 180MPH (at least theoretically since the car won't go that fast). I thought I would share this solution to my speedo probs. When I bought my car with the SR already installed, The speedo didn't work. I hooked up the speed sensor, and got 2X readings. I swapped in the JDM gauge cluster and still got 2x readings (now in KM). I wasn't sure which speed sensor I needed (OBDI vs OBDII?), so I bought a speedo calibrator from Canadian Automotive Instruments. This electronic device connects inline with the VSS signal, and alows you to set your calibration factor with dip switches. I dialed in a factor of 0.3123 which compensates for 2X readings, KMH to MPH, and my 17" wheels. This was a pretty easy solution and cost $140 shipped. If I hadn't already cut the VSS signal to my ECU, this would have bumped my speed limiter to around 170MPH. I'll post my top speed, when I get a safe chance to open her up.

12-09-2003, 12:41 PM	#3
MadChild Leaky Injector Join Date: Jul 2003 Location: MN Age: 40 Posts: 58 Trader Rating: (0) Feedback Score: 0 reviews	Having the SR running at such a high RPM to get your top speed, would not be such a good idea. You realize how long you going to have to hold it in about 5000 in 5th gear. In 5th your power most likely topped out already, and you going to have to push the sucker hard. __________________ '90 240SX w/SR20DET

12-09-2003, 03:53 PM	#4
ge0man Leaky Injector Join Date: Aug 2003 Location: New Jersey Age: 39 Posts: 61 Trader Rating: (0) Feedback Score: 0 reviews	video __________________ Black 1995 240sx - T3/T4 KA-T based system -

12-10-2003, 09:55 AM	#8
knghtryde Zilvia Addict Join Date: Sep 2003 Location: From San Jose, CA now Springfield, MO Age: 45 Posts: 787 Trader Rating: (0) Feedback Score: 0 reviews	Drop a Z32 TT gear box on your Bell housing, and a Z32 TT rear VLSD. Trust me with that set up you can get some serious top end power out of either the KA or SR depending on power modifications. You might actually be able to pick up some serious speeds. __________________ David Munoz, 1989 S13 KA24ET 1990 Infiniti Q45 To push oneself to the limit is all that one can do. To quit is to die.

12-09-2003, 11:58 AM	#2
Flybert Post Whore! Join Date: Mar 2003 Location: none Posts: 3,862 Trader Rating: (7) Feedback Score: 7 reviews	Your gearing or lack of power is what's going to top you out if you don't have a speed limiter. Do it at late at night when nobody is around and I hope those tires have a good speed rating on them. And make sure the road is flat as hell or else you might catch some air and kill yourself.

12-09-2003, 10:37 PM	#6
Bill Roberts Zilvia FREAK! Join Date: May 2003 Location: S FL. Posts: 1,538 Trader Rating: (0) Feedback Score: 0 reviews	5900 in 5th is all I could ever do period......and the speedo was in the hole.. I guess I was running around 143 give or take..