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Imon Fyre
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PostPosted: Tue Apr 01, 2003 1:33 am 
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I have the 93 colt, but no tach yet. I don't know where to get the signal wire from, maybe you could tell me where you got your signal from
Dennis
find the stuff you are lookin for here http://www.miragetuner.net/howto/tachs.html

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xlr8
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PostPosted: Tue Apr 01, 2003 8:00 pm 
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A rev limiter can only stop the engine from over revving itself by cutting fuel and/or spark. If you miss a gear and click back from 5th to 2nd there is nothing that is gonna stop it revving save mechanical failure (like you stick a valve through a piston).
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thelancer
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PostPosted: Wed Apr 02, 2003 6:55 am 
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i have a colt 200 gt 4g15 that came with a tach from factory and my red line starts at 6500 rpm and i never found the revlimiter and let me tell you, i went more than once over 7k !

with a k&n its amaxing the sound of this car at 6500 rpm and over!! :twisted: hehe
thats absolutely true!!!! I got the k&n in mine now and it sounds sweet!..My redline starts at 6500 rpm also with factory tach.

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foxraver
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PostPosted: Tue Apr 08, 2003 11:26 pm 
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hey, username...you can use the small blue plug on the firewall near the wiper...it's one wire with a plug that came of a big pack of wire...tHat's what i did for my ls cluster...
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mirage_turbo89
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PostPosted: Wed Apr 09, 2003 6:56 pm 
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you guys think going over 6500 sounds bad ass, i got a freind with a b-16 honda in a 91 civic which is pretty much built top and bottom end. He has a chipped ecu with no rev limiter and he winds it all the way to 9000rpm. stock rev limiter was at 8200rpm. Engine makes a totally different noise past 8000rpm. Its pretty crazy.

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kactus1
 Post subject: rev limiter
PostPosted: Wed Apr 09, 2003 10:19 pm 
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If the 4g15 makes max hp at 6000rpm, i would think that there would be no point reving the car past this point. If you set this tach to, lets say 6300, then that would give a clear view and point of reference to the face of the tach so you would know when to shift. If you rev past the max torque and hp curve i would not see a point of stretching the internal parts of the motor more than you have to.
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Guest
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PostPosted: Wed Apr 09, 2003 11:01 pm 
I don't know where the max hp point is for the 4g15, but the point for revving past the peak hp point is so that when you shift to the next gear, you are still inside the powerband. Shifting too early (in some cases) can put you into a low hp part of the powerband. It's not always as simple as saying, "well the peak hp is at 5700, so you should shift there".
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xlr8
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PostPosted: Thu Apr 10, 2003 9:11 pm 
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Very true Jason. I find with my 4G15 powered car that I need to rev to about 6500rpm to make sure that the 1-2 & 2-3 shifts stay in the power band which is above 4000rpm. Given that, I wound the valve lash in (one good thing about solid lifters) from .15/.25mm (inlet/exhaust) to .08/.18mm which woke up the top end a little to make revving it more worthwhile. I checked compression before and after and it was the same (If they are wound in too far you will loose compression and power).
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kactus1
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PostPosted: Thu Apr 10, 2003 11:54 pm 
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yes , if you decrease valve lash(tighter) you will have a higher reving motor, however , i believe you loose some torque. also the reason
you would loose compression would be that the tight valve is now hanging
open....a good way to burn valves. something to carefull of.
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socrateez
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PostPosted: Sun May 11, 2003 6:11 pm 
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I miss shifted once . Tach ran up to 7200 and bounced.

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04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
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HondaHunter
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PostPosted: Thu May 22, 2003 8:16 pm 
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i installed my VDO tach yesterday, and decided.....lemme see where my "fun-limiter" is at.......so i took Forgee out for a test run and i found the limiter at 7100....surprised me that she can still rev that high :-?

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socrateez
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PostPosted: Fri May 23, 2003 5:53 pm 
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right on Honda Hunter! Kinda scary to hear that little engine rev that high without exploding. A testament to Mitsubishi design.

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04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t
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socrateez
 Post subject: Re: 4g15 rpm
PostPosted: Fri May 23, 2003 6:42 pm 
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Well from my experience there is no point revving the 4G15 past about 6000rpm unless you have a hot cam in there. I find that changing at around 5800 in my 4G15 Excel drops it smack bang in the middle of the peak in the torque curve. It chirps second with sticky Dunlop rubber when I change at this point. If I go higher, less torque & no chirp & slower.

The 4G15 is an undersquare motor not designed for revs, more for mid-range torque. The 4G61 is very oversquare and hence has low torque but revs to the moon.

Redline on the '93 Excel is at 6200rpm - although this version never made it to the US and is MAP based rather than MAFS.
the version in the excel is also 8 valve and as far as i have seen, no 12 valve motors ever went in them in the U.S. Porting is way different on 12 valve motors. I'm sure the power band would be affected. I believe 12 valve version was introduced in in some 90's and on 91' models.
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04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t
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HondaHunter
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PostPosted: Fri May 23, 2003 6:53 pm 
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right on Honda Hunter! Kinda scary to hear that little engine rev that high without exploding. A testament to Mitsubishi design.
lol yeah especially when you go past 6500 and you feel the front end kind dip down a lil.....then i slap the auto-stick into 2nd and the front end lifts up......plus i put the timing at 9 degrees with 91 octane......im sold on 91...no more 87 for Forgee :D

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I own a CSM.
I live my life 1 repair at a time.
Nothing matters...not my crew...my bills, nor my friends drama...
For those 10 months or less... I'm broke...
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socrateez
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PostPosted: Fri May 23, 2003 8:43 pm 
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ive been playin around with timing, seems anything past 9 degrees requires octane boost and bottom end goes to crap. My intake is louder than the exhaust after 6000 rpm :D
I need to quit procrastinating and pull the suspension off my 89 gt. The stock suspension leaves alot to be desired! serious ass-sag when shifting. Got to be losing tons of torque in the suspension. :cry: I modified a front mount recently. I filled it with vulcanizing rubber. took like two weeks to cure! Solid rubber mount! I'll let you know how it performs as i'm installing it this weekend. The stock mount flexes way too much!
don't mean to ramble.

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04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t
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