High RPM? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

silentcovenant · 04-01-2009, 06:56 PM

Anyone know how I can fix my car? When cruising on the freeway at 55mph, my RPM is unusually high at 2,500rpm. I drive a 1991 S13 and it's always been like that since I got it not too long ago. Is there any way I can fix this? I know this is unusual. I'm in 5th gear and it shouldn't be that high!

Please help!

Thanks,
--Marc

drifter_for_life06 · 04-01-2009, 06:59 PM

ive never seen an S13 rev that high...whats your secret?!

waynehead05 · 04-01-2009, 07:01 PM

Wait... how high did it rev?

Sileighty_85 · 04-01-2009, 07:02 PM

hmmm yeah 25,000 RPMs is really high......i didnt know KA's could REV that high lol

its not an electrical thing, Only way to lower your curizing RPM's is to either re-gear the Diff or the Tranny

Soup Nazi · 04-01-2009, 07:11 PM

Hmm, how much Torque are you putting out? Reason being, you may have a honda motor. Hence those high Rpms

silentcovenant · 04-01-2009, 07:21 PM

Thanks for the sarcasm guys.. I fixed the typo. But seriously, the car sounds like its struggling at 60mph on the freeway. Not good Revs to 3000 at 60mph

nismoskyz · 04-01-2009, 07:34 PM

thats awesome!

does it sound anything like this??
YouTube - Renault's 2.4L V8 @ 20,000 RPMs

edit* aw, too little too late... ^nice vid nonetheless.

hmm, im usually roughly at about 3000 @ 70mph in 5th
something must be up with your gears although idk how that could be...

or maybe your tach is just messed up.

does it sound like its @ 2500 or 3000? if you can compare it with another..

91tofordee · 04-01-2009, 07:40 PM

i have an sr that is at 2500 at 55mph

Soup Nazi · 04-01-2009, 08:12 PM

3k @ 60MPH doesnt seem too off.

mr.booie · 04-01-2009, 08:17 PM

thats normal RPMS.

nismoskyz · 04-01-2009, 08:37 PM

also are you on stock wheel sizes? your rim setup could be throwing off your speedo just a little...

S13 curtis · 04-01-2009, 09:19 PM

yep thats about right its the same for me thats why our hgwy gas mileage sucks. put some 70 series tires and you'll get 35mpg or something like that. the taller the tire the more it cuts down the gear ratio. on 215 60r 15's i do the same as you at 65 mph it sucks. or put a j30 diff in it i think its like 3.90 or something like that. stock 240sx gear is 4.08.

silentcovenant · 04-02-2009, 01:49 AM

Oh ok.. I have a stock KA and yes, my rims/tires aren't stock anymore. I'm running a weird size a friend of mine traded me for: 205/40/17. I need bigger tires. What should I get with my 17"s?

Thanks, guys

nismoskyz · 04-02-2009, 07:21 PM

205/40/17 is pretty small for the rear. I ran that size up front before but not rear...

according to this tire size calc: Tire Size Calculator - tire & wheel plus sizing

your speedo is about 3.2% too fast... that's not that bad, but it is probably contributing to what you're feeling with the RPM.

I ran 225/45/17s on 17x7 for a while and loved em..

04-01-2009, 06:56 PM	#1
silentcovenant Leaky Injector Join Date: Apr 2009 Location: Hawaii Age: 36 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	High RPM? Anyone know how I can fix my car? When cruising on the freeway at 55mph, my RPM is unusually high at 2,500rpm. I drive a 1991 S13 and it's always been like that since I got it not too long ago. Is there any way I can fix this? I know this is unusual. I'm in 5th gear and it shouldn't be that high! Please help! Thanks, --Marc Last edited by silentcovenant; 04-01-2009 at 07:24 PM..

04-01-2009, 06:59 PM	#2
drifter_for_life06 Zilvia Addict Join Date: Sep 2005 Location: New Freedom, PA Age: 36 Posts: 775 Trader Rating: (6) Feedback Score: 6 reviews	ive never seen an S13 rev that high...whats your secret?! __________________ RPS13: +.020" 2871r 264's AEM EMS http://enjukuracing.com/#_l_4s

04-01-2009, 07:01 PM	#3
waynehead05 Zilvia Junkie Join Date: May 2005 Location: Dallas Age: 38 Posts: 466 Trader Rating: (1) Feedback Score: 1 reviews	Wait... how high did it rev? __________________ Who in their right mind would want to lead this nation of Me-First Right-Now Do Nothings??

04-01-2009, 07:02 PM	#4
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	hmmm yeah 25,000 RPMs is really high......i didnt know KA's could REV that high lol its not an electrical thing, Only way to lower your curizing RPM's is to either re-gear the Diff or the Tranny __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

04-01-2009, 07:34 PM	#7
nismoskyz Zilvia Junkie Join Date: Feb 2008 Location: socal Posts: 312 Trader Rating: (4) Feedback Score: 4 reviews	thats awesome! does it sound anything like this?? YouTube - Renault's 2.4L V8 @ 20,000 RPMs edit* aw, too little too late... ^nice vid nonetheless. hmm, im usually roughly at about 3000 @ 70mph in 5th something must be up with your gears although idk how that could be... or maybe your tach is just messed up. does it sound like its @ 2500 or 3000? if you can compare it with another.. __________________ (function)(form)^(-1)

04-01-2009, 07:21 PM	#6
silentcovenant Leaky Injector Join Date: Apr 2009 Location: Hawaii Age: 36 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Thanks for the sarcasm guys.. I fixed the typo. But seriously, the car sounds like its struggling at 60mph on the freeway. Not good Revs to 3000 at 60mph

04-01-2009, 07:40 PM	#8
91tofordee Leaky Injector Join Date: Feb 2009 Location: Blairsville, PA Posts: 109 Trader Rating: (2) Feedback Score: 2 reviews	i have an sr that is at 2500 at 55mph

04-01-2009, 08:17 PM	#10
mr.booie Zilvia Addict Join Date: Apr 2008 Location: Palmdale 93551 Posts: 769 Trader Rating: (10) Feedback Score: 10 reviews	thats normal RPMS. __________________

04-01-2009, 08:37 PM	#11
nismoskyz Zilvia Junkie Join Date: Feb 2008 Location: socal Posts: 312 Trader Rating: (4) Feedback Score: 4 reviews	also are you on stock wheel sizes? your rim setup could be throwing off your speedo just a little... __________________ (function)(form)^(-1)

04-01-2009, 09:19 PM	#12
S13 curtis Zilvia Addict Join Date: Jun 2008 Location: Orlando,FL Age: 34 Posts: 651 Trader Rating: (13) Feedback Score: 13 reviews	yep thats about right its the same for me thats why our hgwy gas mileage sucks. put some 70 series tires and you'll get 35mpg or something like that. the taller the tire the more it cuts down the gear ratio. on 215 60r 15's i do the same as you at 65 mph it sucks. or put a j30 diff in it i think its like 3.90 or something like that. stock 240sx gear is 4.08.

04-02-2009, 01:49 AM	#13
silentcovenant Leaky Injector Join Date: Apr 2009 Location: Hawaii Age: 36 Posts: 54 Trader Rating: (0) Feedback Score: 0 reviews	Oh ok.. I have a stock KA and yes, my rims/tires aren't stock anymore. I'm running a weird size a friend of mine traded me for: 205/40/17. I need bigger tires. What should I get with my 17"s? Thanks, guys

04-02-2009, 07:21 PM	#14
nismoskyz Zilvia Junkie Join Date: Feb 2008 Location: socal Posts: 312 Trader Rating: (4) Feedback Score: 4 reviews	205/40/17 is pretty small for the rear. I ran that size up front before but not rear... according to this tire size calc: Tire Size Calculator - tire & wheel plus sizing your speedo is about 3.2% too fast... that's not that bad, but it is probably contributing to what you're feeling with the RPM. I ran 225/45/17s on 17x7 for a while and loved em.. __________________ (function)(form)^(-1)