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Old 03-14-2013, 08:39 AM  
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Default 91 samurai highway issues

I recently purchased my 1st samurai. It is completely stock other than the p235 size tires. On flat highway I have to really wind out 4th gear to get to 55, and then once i shift into 5th I normally cant maintain that speed. I live in eastern ky so that makes matters even worse considering that there arent any flat highways. More often than not I find myself wound out in 3rd gear (45 mph) trying to maintain safe speed on a small incline. Shouldnt I at leastbe able to maintain 55-60mph on flat ground? What is wrong with my Sami. It just doesnt seem to have the power it should.
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Old 03-14-2013, 09:04 AM  
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Dont know about the american zuks but i find mine gets to 50 and thats pretty my maxed out for me.
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Old 03-14-2013, 02:12 PM  
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I also have a completely stock zuk with a rebuilt motor and when i had 215x75x15 tires it was much better than the 235x75x15 tires i have on their now..... I can get 4th gear up to up to about 65mph but as soon as i put it in 5th and a slight hill i drop down to about 55mph. others have told me changing the transfer case gearing to 4:16 to 1 ratio would improve that and also help out on 1st gear low range in the trails.
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Old 03-17-2013, 08:37 AM  
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Quote:
Originally Posted by Zhuber3 View Post
I recently purchased my 1st samurai. It is completely stock other than the p235 size tires. On flat highway I have to really wind out 4th gear to get to 55, and then once i shift into 5th I normally cant maintain that speed. I live in eastern ky so that makes matters even worse considering that there arent any flat highways. More often than not I find myself wound out in 3rd gear (45 mph) trying to maintain safe speed on a small incline. Shouldnt I at leastbe able to maintain 55-60mph on flat ground? What is wrong with my Sami. It just doesnt seem to have the power it should.
You have big heavy tires on it. Go back to a 205 or 215 sized tire, or put 4.16 transfer case gears in and that will help out the "power".
Also, have you done a tune up, since you bought it?....check/set the engine timing (10*), set the valve lash, replace the spark plugs (NGK), replace the plug wires, replace the distributor cap and rotor. I would also recommend replacing the timing belt, if it hasn't been replaced in the last 100K miles or so.
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Old 03-17-2013, 10:14 AM  
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Sky is giving you the true skinny. FIRST tune your rig. Then think upgrade.
I will add this: I have been testing the new E-3 plugs in all of my rigs for the past year.
In the past I always ran NGK.
I run Accell 9mm wires in all rigs as well.
Noticeable increase in power and economy.
I highly recommend this set up.
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Old 03-19-2013, 03:05 PM  
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I have a 92 Zuke and like mentioned, The first thing I did when I got her was to do a tune up including cap/rotor/plugs and wires as well as an oil change. I have no problems driving 75 mph at all. I one time opened her up and hit 85 with no issues. Something is going on with your ride if you are having those speed problems. I am running 205-70-15's on mine.

PS: My Zuke is totally stock with almost 45,000 original miles.
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Old 03-19-2013, 04:56 PM  
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A stock sami in great condition might have 70HP. With 20+ years of who knows what you are probably running less than that.

A stock samurai simply does not have the intestinal fortitude to run tires that size.

Do that tuneup the others have talked about and put some smaller tires on or get the transfer-case upgrade.
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Old 03-19-2013, 10:24 PM  
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Quote:
Originally Posted by hotrodsami View Post
A stock sami in great condition might have 70HP. With 20+ years of who knows what you are probably running less than that.

A stock samurai simply does not have the intestinal fortitude to run tires that size.

Do that tuneup the others have talked about and put some smaller tires on or get the transfer-case upgrade.
X2

When i had smaller tires highway top end was so much better(well into the 70's).... when i put the 235's on top end was gone and it became a 4th gear vehicle. the larger tires lift my differentials enough to clear most Arizona Rocky terrain so my next step is either put smaller tires back on or get the 4:16 to 1 transfer case or "Live With It"..... I'll probably live with it for a while as i only need to go about 10 miles on the Interstate to hit the trails...... I've also noticed with the bigger tires that trying to maintain a decent speed of 65 on the Interstate the engine runs much hotter now than it did with the smaller tires.At 55mph (which will get you killed on the Interstate 75mph) or around town or in the trails it's fine....... the gearing is too high and the tires too big for that small motor
JMTC
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Old 03-20-2013, 07:16 AM  
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What size tires would u suggest? I live in the mountains and im a coal miner so getting to work always requires decent off road tires.. But i have to drive about 45 miles of highway first.
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Old 03-20-2013, 08:13 AM  
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Quote:
Originally Posted by Zhuber3 View Post
What size tires would u suggest? I live in the mountains and im a coal miner so getting to work always requires decent off road tires.. But i have to drive about 45 miles of highway first.
You can keep your 235s, you just need to regear the tcase, or axles, to help out with the power.
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