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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Location:
Adelaide
Registered:
May 2003
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Re: 4A-GE 100kw owners - power at 4.5-6Krpm
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Sat, 20 March 2004 11:51
 
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When my stock 100kw was in the SX i had pretty smooth but a decent power hit just above 3700rpm. Which if nailed would blow a bit of smoke there and then rev through the rest of the range a lot faster.
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I supported Toymods
Toymods Club Secretary
Location:
Sydney
Registered:
May 2002
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Re: 4A-GE 100kw owners - power at 4.5-6Krpm
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Sat, 20 March 2004 21:16
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| THE WITZL wrote on Sat, 20 March 2004 20:04 |
I have noticed that i have a pretty decent flat spot in power delivery from around 4.5/5000 to 6000rpm, at which point the car picks up and fucking moves (and blows a poop load of smoke).
Im wondering if anyone else has noticed this with their smallport?
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Definitely NOT!!  I seem to get the best throttle response in the higher rev-range.
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4A-GE 100kw owners - power at 4.5-6Krpm
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Sat, 20 March 2004 21:53
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yeah i have good throttle response in that range, but it just seems like it flats out in power until i get above 6000rpm, when thee power suddenly increases and engine speed rockets up to 7000rpm and beyond.
ok, time to fix the PCV problem.
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Location:
Ipswich
Registered:
May 2002
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Re: 4A-GE 100kw owners - power at 4.5-6Krpm
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Sat, 20 March 2004 22:02
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When I drove the car that I got my engine out of (1991 Corolla SX) it felt the same. Below probably 3500RPM it was fairly average, and then once you get about there it starts to hammer all the way to redline! Felt strange considering there's no VVTi or anything like that...
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Location:
Melbourne
Registered:
July 2002
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Re: 4A-GE 100kw owners - power at 4.5-6Krpm
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Sun, 21 March 2004 02:46
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I was reading somewhere that on the 100kw engines, at around 5,000rpm all the injectors begin to fire at once (you can hear a slight change in engine noise when this happens). My 100kw pumps out black smoke when this happens, so i guess thats normal. makes sense.
Maybe your engine is flooding badly when this happens, causing the flatspot?? i'd be checking the following (if you already haven't)
1. Condition/Operation of Injectors
2. Condition of spark plugs (gap etc etc)
3. Condition of leads
4. Fuel pressure (check filter , pressure and flow)
5. Vacuum leaks (have the engine running and spray WD40 around all the manifolds etc etc, if the engine flares then u have found the leak)
Just a few ideas. Hope it helps!!
Cheers
Gaz
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Location:
NSW, East Coast
Registered:
July 2003
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Re: 4A-GE 100kw owners - power at 4.5-6Krpm
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Fri, 16 April 2004 15:55
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| THE WITZL wrote on Sun, 21 March 2004 08:53 |
yeah i have good throttle response in that range, but it just seems like it flats out in power until i get above 6000rpm, when thee power suddenly increases and engine speed rockets up to 7000rpm and beyond.
ok, time to fix the PCV problem.
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What was the drama with the pcv.
Im having drama's with mine.
Steve
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Banned user
Location:
ADELAIDE - The Drift City
Registered:
July 2002
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Re: 4A-GE 100kw owners - power at 4.5-6Krpm
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Fri, 16 April 2004 16:10
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mine kicks in hard at 4000 rpm, it'sstill decent and resonsive before that, thanks to 20 degrees advanced timing in the base map 
I have a smallport running a bigport ECU, it goes bloody well for a stock motor! revs to 7500 and has taken an absolute thrashing for a long time.
Ihave noflatspots but it does run rich (shoots flames asa result, and plugs dont last forever either... but still no flatspots)
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4A-GE 100kw owners - power at 4.5-6Krpm
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Tue, 06 July 2004 10:13
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ok.. well it looks like i have proved my point about what i felt!!
Check this shit out!!!
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4A-GE 100kw owners - power at 4.5-6Krpm
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Tue, 06 July 2004 10:22
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ok... so lets start pumping out some theories!
The most obscure thus far have been:
# resonance in the tailshaft
# the oil the motor is burning actually produces power
# the diff whine goes away at 150kph
but something that gets me is, the power flattens out exactly where the AFR drops about 0.6:1.. but then it doesnt make sense why it spikes so hard up the top there.
I have also thought about resonance in the intake... all sortsa shit.
COMON SOMEONE!! ANSWER THIS FOR ME!!!
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Location:
Ipswich
Registered:
May 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Tue, 06 July 2004 11:23
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Well, if it helps at all this is my dyno sheet:
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Location:
Ipswich
Registered:
May 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Tue, 06 July 2004 11:27
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And for anyone who's wondering, the figures are (yes, the scan is a bit small...):
383Nm @ 82kph (approx 3300RPM)
69hp @ 140kph (5740RPM)
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Tue, 06 July 2004 11:53
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thats very low RPM for 4age powah!
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Tue, 06 July 2004 11:58
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Try changing the O2 sensor. 
Eviljack had similar problems with lack of power and running rich in an RA28 and a diffferent O2 sensor worked for him.
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Location:
Montrose, VIC
Registered:
May 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Tue, 06 July 2004 12:00
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Well, I've heard of people having issues like this sometimes with a lampshade filter on a 4AG - try different bits of pipe etc. on the front of the throttle. Nothing nasty happened when your manifold was welded did it?
Besides, I wouldn't stress about it, the TURBO will fix the flat spots  (It's time I got that to you, ey...)
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Tue, 06 July 2004 12:06
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OH YEAH!
yeah intake will be the next thing i play with.... perhaps the elephants dick aint all that crash hot!
Scorpion - hows about... no. The oxygen sensor is new as of less than 10000k's ago (ie when i get the exhaust on). Also, pretty mcuh all Toyota ECU's run in open loop when at WOT.... O2 sensors are only used in cruise conditions.
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Location:
Ipswich
Registered:
May 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Tue, 06 July 2004 21:19
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Well the torque jumps up again at about 4500RPM when it comes on cam and peaks again at 5000RPM pretty much close to 383Nm.
With the AFR reading, 12.5:1 is more RICH than 13.0:1 right? Cause the dyno guy told me that my engine LEANS out toward the top end, but it looks like it becomes richer?
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Location:
Ipswich
Registered:
May 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Tue, 06 July 2004 22:20
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Karl: Was your dyno done in 4th? What's the difference in "shootout mode"?
Your 4AGE seems to peak a lot later than mine, I wonder why... When I'm driving it seems to rev very happily all the way from about 4500 all the way to just past 8000RPM, but according to my dyno sheet there's no point in me going past about 7000RPM because the power drops off rather sharply there (and the torque figures by that stage are REALLY low anyway)...
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Location:
Montrose, VIC
Registered:
May 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Wed, 07 July 2004 10:43
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No chance the bitch has cams in it is there??
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Location:
Adelaide
Registered:
May 2003
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Wed, 07 July 2004 11:23
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Could possibly be cams, but they would come on at lower RPM than that, more around the 5,500rpm i would think. Depends on which cams of course though.
For comparison here is my stock 100kw graph
This was with a 2" zorst, and a hot air intake.
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Location:
Melbourne
Registered:
August 2003
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Wed, 07 July 2004 12:31
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| Quote: |
With the AFR reading, 12.5:1 is more RICH than 13.0:1 right? Cause the dyno guy told me that my engine LEANS out toward the top end, but it looks like it becomes richer?
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12.5 parts air to 1 part fuel.
13 parts air to 1 part fuel.
12.5:1 is 'richer' (more fuel to air) than 13:1.
Stoichiometric is ~14.7:1? So you're still rich on WOT, like you want to be. Having any detonation problems?
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Location:
Ipswich
Registered:
May 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Wed, 07 July 2004 12:59
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detonation problems? Don't think so. Hmm, wonder why the dyno guy kept telling me my car was "leaning out" then... You'd think if he worked with the dyno all day every day he'd know which way "lean" and which way "rich" was...
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Wed, 07 July 2004 13:19
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takai - the wheel speed looks pretty low on your dyno graph there, was that done in 3rd gear? yours peaks at 120pkh, and mine at 160kph!!
cams - i doubt it, this motor came out of a bin remember!?!
Plus, if you extrapolate the curve from 90pkh onwards... it looks like it would meet up with the peak which i achieve at 160pkh there... so i dont think its cams...
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Location:
Adelaide
Registered:
May 2003
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Wed, 07 July 2004 13:28
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Yeah, i think that was a 3rd gear dyno run. It was when they were checking to see how rich my engine was running, and i wasnt present. So i think they ran it in 3rd to inflate the figure.
Certainly doesnt seem like 4th.
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Location:
Sunshine Coast
Registered:
February 2004
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Re: 4A-GE 100kw owners - power DROPS at 4.5-6Krpm (dyno pics)
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Sun, 18 July 2004 13:15
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any luck as of yet?
i seem to be having the same issues with my 4agze 
its not a good thing when ya trying to keep up with a 300zx. the skyline wasnt too much of a hassle.
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