pathfindervirgin Posted September 19, 2006 Share Posted September 19, 2006 Hi there all! I have received some great advice on my new pathy. As I am still a new owner I havn't had time to do a lot of research into mods and such. Two questions..I noticed that with mine(91 4dr 4x4 3.0ltr) it revs awfully high, or what I consider high on the highway. Does that have anything to do with how it is geared or does it have something to do with the differential? I have a 2001 grand am with a 4cl engine and it revs about 1500 rpm lower than the pathy. Sencone question, is there a larger engine that will fit my pathy? Thanks Link to comment Share on other sites More sharing options...
jj big shoe Posted September 19, 2006 Share Posted September 19, 2006 Yeah, Pathfinders are geared pretty low. My 87 5 speed at 70 mph is running a little over 3100 rpm with 32" tires. My buddy's 95 auto does about the same with stock 31"s. There's not many (if any) easy motor swaps for these like Hondas have. Check around the garage section for what you can do to get a bit more umph out of your VG30. Its a very durable motor and pretty easy to work on, but it's no screamer. Link to comment Share on other sites More sharing options...
Slick Posted September 19, 2006 Share Posted September 19, 2006 i am not sure about my auto yet (on 33's) as i still haven't got my plates and insurance on it yet. but my 5 speed (92) in 5th at 65mph is at 2800rpm. these are high rom motors.. usual shift point is between 2800-3000rpm on manuals. Link to comment Share on other sites More sharing options...
88pathoffroad Posted September 19, 2006 Share Posted September 19, 2006 IIRC, I hit about 2300 RPM's at 60 MPH with 33x13.50's and an automatic. The manuals don't have OD or a locking torque converter, that's why they rev higher. Link to comment Share on other sites More sharing options...
94extreme Posted September 19, 2006 Share Posted September 19, 2006 yeah.. mine revs high at 70 or above.. 3000+ and it drinks gas like a drunken sailor on shore leave. i defnitely get the best MPGs in the CITY! Link to comment Share on other sites More sharing options...
~Ben~ Posted September 19, 2006 Share Posted September 19, 2006 Pretty sure I rev at around 3700-3800 RPM above 75 mph (what I usually go on the highway). '95 XE Automatic. 3.0 litre engine. Link to comment Share on other sites More sharing options...
94extreme Posted September 19, 2006 Share Posted September 19, 2006 Pretty sure I rev at around 3700-3800 RPM above 75 mph (what I usually go on the highway). '95 XE Automatic. 3.0 litre engine. mine is stick and i think i get those revs at ~80+/- Link to comment Share on other sites More sharing options...
Vsicks Pathy Posted September 20, 2006 Share Posted September 20, 2006 They are geared low to compensate for their under powered engines. To gett better MPG up size your tyres and change your diff ratios to 4.3:1. That should work. Link to comment Share on other sites More sharing options...
SC88Pathy Posted September 20, 2006 Share Posted September 20, 2006 My 88 auto hovers at around 2500 at 70 and a bit over 3000 at 80. Of course 88's don't have over drive so a 91 auto will probably differ a little... Link to comment Share on other sites More sharing options...
94extreme Posted September 20, 2006 Share Posted September 20, 2006 They are geared low to compensate for their under powered engines. To gett better MPG up size your tyres and change your diff ratios to 4.3:1. That should work. but what about off road performance, v6? i gotthe bigger tires and all that did was to make it so i don't know the real milage nor speed.. today the rpms were: 2800@60-65mph Link to comment Share on other sites More sharing options...
RedPath88 Posted September 20, 2006 Share Posted September 20, 2006 It's a compromise when you use it for both Figure out the difference (%) to get an accurate MPG rating. Did your truck originally come with 235/75-15's? When I put the 33's on my yota I stopped a local cop and asked him to clock me Instead he had me follow and when he reach 25 he flashed his rear lights at me, then again at 35 and 55 Link to comment Share on other sites More sharing options...
94extreme Posted September 20, 2006 Share Posted September 20, 2006 well, i am sticking with the gears i have because this thing rocks off road.. not sure what the size was but not 31s. it's stamped on the center pillar but i never bothered to look.. first thing i did was to slap the 31" muds on there.. it seems that the mph vary somewhat.. at lower speeds it's around 5mph faster then the clock.. at 70 or higher it's closer to 10mph over.. my tk was never intended to be my main transport and as soon the cash flows my other junkers will be getting back on the road.. Link to comment Share on other sites More sharing options...
RedPath88 Posted September 20, 2006 Share Posted September 20, 2006 I did the same (upgrade to 31's) The difference is speed seems to be a none issue on the Path. As I have had no issues with cops and no drastic difference between my speed and the rest of traffics The Yota's Speedometer is off by one at 25 (it reads 24) and 4 at 55 (it reads 51) this according the a police cars speedometer Link to comment Share on other sites More sharing options...
Precise1 Posted September 21, 2006 Share Posted September 21, 2006 These are the facts... Maybe your speedo was slow before, Red ?? Not a big change, but it will change. B Tire_Diff.rtf Link to comment Share on other sites More sharing options...
adamzan Posted September 21, 2006 Share Posted September 21, 2006 Mine, when it was on the road , a 94 auto will rev at 2800~ at 65 without OD and with OD it dropped to 2100 :o It's better on gas than my dads R50 Link to comment Share on other sites More sharing options...
RedPath88 Posted September 21, 2006 Share Posted September 21, 2006 These are the facts...Maybe your speedo was slow before, Red ?? Not a big change, but it will change. B On the yota? Yeah it's possible, the truck as led a tough off road life, its been rolled over once or twice while wheeling (slow roll) pounded straight and sent out for more abuse. There is not one single straight spot on the entire body... combined with 260K+ on the odometer it is possible that it was wrong before I put the 33's on. But knowing that it would be, you have the reason I verified the "true" readings of the speedometer And what is that attachement.. no matter what I do the only thing I get is {\rtf1} Link to comment Share on other sites More sharing options...
Precise1 Posted September 21, 2006 Share Posted September 21, 2006 Oops, sorry, lets try this... Dimension Tire A: 235/75 R 15(29 x 9.25 x 15)Tire B: 275/75 R 15(31 x 10.83 x 15) Difference Width 9.25" (235.00mm) 10.83" (275.00mm) +1.57" (+40.00mm) Sidewall height 6.94" (176.25mm) 8.12" (206.25mm) +1.18" (+30.00mm) Overall height 28.88" (733.50mm) 31.24" (793.50mm) +2.36" (+60.00mm) Circumference 90.72" (2304.36mm) 98.14" (2492.85mm) +7.42" (+188.50mm) Speedometer Error Actual Speed Indicated Speed with Tire B Speedometer Error 5 mph (8.04 kph) 4.62 mph (7.44 kph) -0.38 mph (-0.61 kph) 10 mph (16.09 kph) 9.24 mph (14.87 kph) -0.76 mph (-1.22 kph) 15 mph (24.13 kph) 13.87 mph (22.31 kph) -1.13 mph (-1.82 kph) 20 mph (32.18 kph) 18.49 mph (29.75 kph) -1.51 mph (-2.43 kph) 25 mph (40.23 kph) 23.11 mph (37.18 kph) -1.89 mph (-3.04 kph) 30 mph (48.27 kph) 27.73 mph (44.62 kph) -2.27 mph (-3.65 kph) 35 mph (56.31 kph) 32.35 mph (52.06 kph) -2.65 mph (-4.26 kph) 40 mph (64.36 kph) 36.98 mph (59.49 kph) -3.02 mph (-4.87 kph) 45 mph (72.41 kph) 41.60 mph (66.93 kph) -3.40 mph (-5.47 kph) 50 mph (80.45 kph) 46.22 mph (74.37 kph) -3.78 mph (-6.08 kph) 55 mph (88.50 kph) 50.84 mph (81.80 kph) -4.16 mph (-6.69 kph) 60 mph (96.54 kph) 55.46 mph (89.24 kph) -4.54 mph (-7.30 kph) 65 mph (104.58 kph) 60.09 mph (96.68 kph) -4.91 mph (-7.91 kph) 70 mph (112.63 kph) 64.71 mph (104.11 kph) -5.29 mph (-8.52 kph) 75 mph (120.67 kph) 69.33 mph (111.55 kph) -5.67 mph (-9.12 kph) 80 mph (128.72 kph) 73.95 mph (118.99 kph) -6.05 mph (-9.73 kph) 85 mph (136.76 kph) 78.57 mph (126.42 kph) -6.43 mph (-10.34 kph) 90 mph (144.81 kph) 83.19 mph (133.86 kph) -6.81 mph (-10.95 kph) 95 mph (152.85 kph) 87.82 mph (141.30 kph) -7.18 mph (-11.56 kph) 100 mph (160.90 kph) 92.44 mph (148.73 kph) -7.56 mph (-12.17 kph) 105 mph (168.94 kph) 97.06 mph (156.17 kph) -7.94 mph (-12.77 kph) 110 mph (176.99 kph) 101.68 mph (163.61 kph) -8.32 mph (-13.38 kph) 115 mph (185.03 kph) 106.30 mph (171.04 kph) -8.70 mph (-13.99 kph) 120 mph (193.08 kph) 110.93 mph (178.48 kph) -9.07 mph (-14.60 kph) 125 mph (201.12 kph) 115.55 mph (185.92 kph) -9.45 mph (-15.21 kph) 130 mph (209.17 kph) 120.17 mph (193.35 kph) -9.83 mph (-15.82 kph) 135 mph (217.22 kph) 124.79 mph (200.79 kph) -10.21 mph (-16.42 kph) 140 mph (225.26 kph) 129.41 mph (208.23 kph) -10.59 mph (-17.03 kph) 145 mph (233.31 kph) 134.04 mph (215.66 kph) -10.96 mph (-17.64 kph) 150 mph (241.35 kph) 138.66 mph (223.10 kph) -11.34 mph (-18.25 kph) 155 mph (249.40 kph) 143.28 mph (230.54 kph) -11.72 mph (-18.86 kph) 160 mph (257.44 kph) 147.90 mph (237.97 kph) -12.10 mph (-19.47 kph) 165 mph (265.49 kph) 152.52 mph (245.41 kph) -12.48 mph (-20.07 kph) 170 mph (273.53 kph) 157.15 mph (252.85 kph) -12.85 mph (-20.68 kph) 175 mph (281.57 kph) 161.77 mph (260.28 kph) -13.23 mph (-21.29 kph) 180 mph (289.62 kph) 166.39 mph (267.72 kph) -13.61 mph (-21.90 kph) 185 mph (297.67 kph) 171.01 mph (275.16 kph) -13.99 mph (-22.51 kph) 190 mph (305.71 kph) 175.63 mph (282.59 kph) -14.37 mph (-23.12 kph) 195 mph (313.75 kph) 180.26 mph (290.03 kph) -14.74 mph (-23.72 kph) 200 mph (321.80 kph) 184.88 mph (297.47 kph) -15.12 mph (-24.33 kph) If your speedometer has been calibrated for 235/75 R 15 (29 x 9.25 x 15) tires, replacing them with 275/75 R 15's (31 x 10.83 x 15's) would result in the speedometer reading low by 7.56%. Odometer Error Actual Mileage Indicated Mileage with Tire B Odometer Error 1 mi (1.61 km) 0.92 mi (1.49 km) -0.08 mi (-0.12 km) 5 mi (8.04 km) 4.62 mi (7.44 km) -0.38 mi (-0.61 km) 10 mi (16.09 km) 9.24 mi (14.87 km) -0.76 mi (-1.22 km) 50 mi (80.45 km) 46.22 mi (74.37 km) -3.78 mi (-6.08 km) 100 mi (160.90 km) 92.44 mi (148.73 km) -7.56 mi (-12.17 km) 500 mi (804.50 km) 462.19 mi (743.67 km) -37.81 mi (-60.83 km) 1000 mi (1609.00 km) 924.39 mi (1487.34 km) -75.61 mi (-121.66 km) 5000 mi (8045.00 km) 4621.93 mi (7436.68 km) -378.07 mi (-608.32 km) 10000 mi (16090.00 km) 9243.86 mi (14873.37 km) -756.14 mi (-1216.63 km) 50000 mi (80450.00 km) 46219.28 mi (74366.82 km) -3780.72 mi (-6083.18 km) 100000 mi (160900.00 km) 92438.56 mi (148733.65 km) -7561.44 mi (-12166.35 km) Well, a little jumbled due to losing formatting, but still readable... B Link to comment Share on other sites More sharing options...
Animal Posted September 23, 2006 Share Posted September 23, 2006 Circumference 90.72" (2304.36mm) 98.14" (2492.85mm) +7.42" (+188.50mm)... If your speedometer has been calibrated for 235/75 R 15 (29 x 9.25 x 15) tires, replacing them with 275/75 R 15's (31 x 10.83 x 15's) would result in the speedometer reading low by 7.56%. Error = 188.5 / 2304.36 = 8.18% This should apply to both speed and mileage, though speedometers also have a % of error (typically non-linear). Then again, not all tires of the "same size" are the same size. Also, the effective circumference is the distance from the pavement to the center of the axle multiplied by 2 multiplied by pi. This varies by tire size, manufacturer and model as well as air pressure. It's easier to find a friendly cop. Link to comment Share on other sites More sharing options...
SteeevO Posted September 24, 2006 Share Posted September 24, 2006 at 3000RPM's i'm doing just under 65MPH... and i usually do about 70 - 75MPH on the freeway... it runs fine..infact i think it likes it Link to comment Share on other sites More sharing options...
Animal Posted September 24, 2006 Share Posted September 24, 2006 at 3000RPM's i'm doing just under 65MPH...and i usually do about 70 - 75MPH on the freeway... it runs fine..infact i think it likes it They seem to come to life starting around 3000 (maybe 2800?), below that the torque seem too low. But that's just my observation - seat feeling. I saw some dyno graphs once; I should have paid more attention. Link to comment Share on other sites More sharing options...
IpathyXe Posted September 24, 2006 Share Posted September 24, 2006 I have a 93 xe stock that'll be on the dyno soon. Link to comment Share on other sites More sharing options...
pathfindervirgin Posted September 27, 2006 Author Share Posted September 27, 2006 Well, I am glad to see that I am not the only one. At least I know it is normal, I just wish it had the extra gear for the highway...Dont like taking it on highway trips. Link to comment Share on other sites More sharing options...
94extreme Posted September 27, 2006 Share Posted September 27, 2006 nice tk virgin. Link to comment Share on other sites More sharing options...
SteeevO Posted September 27, 2006 Share Posted September 27, 2006 http://www.datsuns.com/Tech/dyno/VG30/vg30e-510-jwaalkes.gif http://www.datsuns.com/Tech/dyno/VG30/vg30e-510-jwaalkes.gif i just googled for it Link to comment Share on other sites More sharing options...
88pathoffroad Posted September 27, 2006 Share Posted September 27, 2006 Shouldn't the torque and HP lines cross at 5250 RPM's? Maybe it's adjusted for elevation/temp or something. Link to comment Share on other sites More sharing options...
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