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Author Topic: Weird civic glitch  (Read 5114 times)

stealthiskey

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Weird civic glitch
« on: August 30, 2014, 11:09:24 PM »

D16z6 na.
Been going on for over a year.  Rev limit comes on at 6500 instead of 7400.  Did it on the old engine as well.  ECU is chipped, rev limit is set to 7400 in crome.  On a stock p28 bin now, but I think it was doing it on the boosted map as well.  I'll play around with it a bit more, just thought I'd ask the braintrust...

Ever heard of that, any ideas?
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HiProfile

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Re: Weird civic glitch
« Reply #1 on: August 31, 2014, 12:44:54 AM »

Cold rev limiter? My guess is the ECT sensor isn't reading correct, which is separate from the gauge sensor, so the ecu keeps the limiter low. Also check the ignition timing in the vtec map, crome sometimes puts big blocks of values to -6 degrees. Also check the cat converter, sometimes a plugged cat does this.
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they mspainted dildoes in my mom'#039#039s hand, in a picture of her in a hospital bed. -JD
dem gurls need some boobz! -Engloid

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Re: Weird civic glitch
« Reply #2 on: September 11, 2014, 05:27:58 PM »

Someone just posted something similar on H-T, their tach was off by more than 1000rpm. They figured out what rpm it should be at 60mph in 5th, and it was off by the same percentage (600rpm low at that speed). http://www.zealautowerks.com/transcalc.php

See what a datalog would say, or try changing the rev limit on the chip.
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they mspainted dildoes in my mom'#039#039s hand, in a picture of her in a hospital bed. -JD
dem gurls need some boobz! -Engloid

turbohf

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Re: Weird civic glitch
« Reply #3 on: September 14, 2014, 11:53:56 AM »

mine always seem to be off more at higher rpms.

my car datalogs 850rpms at idle and cluster shows around 1100-1150... hits revlimiter at indicated ~6500rpm. should be 7200....

car runs out of gas when you hit the E line... think the speedo is so wrong it ended up being right with the car on 17's..... and i never trust that oem coolant gauge does anything.... OEM clusters are pretty useless.  :-*
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Dustin  :Jew:
1987 Buick Regal Limited 6.0L/4L80E (LQ4, 862 heads, tbss intake, 92mm tb, e1841p cam, Holley EFI)
2000 Silverado LS 5.3L Reg Cab Short Bed
1966 Chevy II Nova 400 4dr Sedan V8


'Faster, Faster, until the thrill of speed overcomes the fear of death.'

ratcityrex

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Re: Weird civic glitch
« Reply #4 on: September 14, 2014, 02:55:43 PM »

None of my cars have ever been off by much. Maybe a couple hundred rpms at rev limiter but other than that it's been fine.
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New setup is old bottom end with a hype r head with gsr cams. built lsv with hx35 @ 26psi on pump gas
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Re: Weird civic glitch
« Reply #5 on: September 14, 2014, 03:57:52 PM »

The tach is usually off by a percentage, the speedo is usually off by a set amount plus percentage. If you limit yourself to 10mph over the posted limit (posted = 65, speedo says 75, actual = ~71), you'll stay under the proverbial radar of 99% of traffic cops. I've verified my odometers are spot-on with the correct tire, so they probably built it into the speedo to err on the side of caution. Similar to the stupid idiot anti-lockout on the driver's lock.

The coolant gauge is accurate for what it's designed to do. It basically tells you if the motor is NOT w/in optimal temp range instead of telling you relative temp. It will rise linearly up to ~160F, then barely move from that spot until 220F or so then rise linearly again. I know those numbers are off, but I think the actual values are in the helms manual.
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they mspainted dildoes in my mom'#039#039s hand, in a picture of her in a hospital bed. -JD
dem gurls need some boobz! -Engloid

ratcityrex

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Re: Weird civic glitch
« Reply #6 on: September 14, 2014, 07:37:29 PM »

Similar to the stupid idiot anti-lockout on the driver's lock.


Easy, pull door handle and while handle is still opened, flip the lock.
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New setup is old bottom end with a hype r head with gsr cams. built lsv with hx35 @ 26psi on pump gas
LEED tuned! 434hp/329tq http://www.youtube.com/watch?v=_pbDXZxZdZs
http://www.realhomemadeturbo.com/forum/index.php/topic,16195.0.html

Old Setup B18a1 296hp/289tq LEED Tuned 20psi on pump! http://www.youtube.com/watch?v=2Yj-Z90j4W4   
http://www.realhomemadeturbo.com/forum/index.php/topic,205.msg2437.html#msg2437

stealthiskey

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Re: Weird civic glitch
« Reply #7 on: October 01, 2014, 06:41:09 PM »

Hmm popped a fresh P30 stock bin on and drove it today.  Same deal, rev limit set to 7411 it cuts at 6500 on the cluster. 

Tried dropping it down to 3500 and it seems to cut right at 3500, although it seems slower to catch back on than at higher rpm.

Tried bumping it up to 8400 and now it cuts at around 7000.  So... you think the gauge off or is it the ECU?

Maybe I should also mention it's been doing this surging idle pretty annoying lately.  turned the IACV compensation down to -20% and that seems to fix it (whatever that actually does I don't know.)  The "target idle" value in chrome doesn't seem to have any effect on anything, I don't think it ever did though.

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HiProfile

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Re: Weird civic glitch
« Reply #8 on: October 14, 2014, 06:18:38 PM »

Take a cheap tach from autozone and tap into the blue tach wire (cluster or underhood), test, return gauge.
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they mspainted dildoes in my mom'#039#039s hand, in a picture of her in a hospital bed. -JD
dem gurls need some boobz! -Engloid
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