bimbleuk
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| posted on 12/4/06 at 02:06 PM |
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20V 4AGE tuning tip for a bit more power
The day started with my Striker feeling rather flat and down on power. The initial run to gets some readings returned 104 BHP (all flywheel readings)
and an engine very reluctant to rev past 6500RPM 
I had an idea the cam timing was not correct and assumed the variable inlet cam wasn't advancing correctly. Sure enough by disconnecting the
variater solenoid wires power went straight up to 131BHP and the engine was willing to rev again!
So why was the engine loosing power with the inlet cam advanced. Simple the cam belt had slipped and both the inlet and exhaust cam were already
advanced. So when the OMEX ECU switched the solenoid the inlet cam advanced another 10-15 deg of timing. Not good for power thats for sure. Thankfully
only the fueling was out and we couldn't detect any pinking or detonation!
After a little more investigation it seems the self adjusting tension pulley was a littel loose and must have let the cam belt jump a couple of teeth.
Thankfully no damage done so if you have a 20V 4AGE I would check your cam belt tensioner ASAP.
Anyway now the cam timing was correct so we reconnected the inlet cam solenoid and did another power run. 144 BHP @ 7800RPM and I'm feeling much
better. The fueling was a little on the lean side so Brian (the garage owner) and myself had a littel play with the OMEX mapping software. Neither of
us have actually mapped a car with the OMEX software but Brian has used several other packages and I've looked over the shoulder of the usual
operator who wasn't available at the time. Between us we get the fueling back to the correct lambda readings 
We're not finished yet though as I've been told a littel tip on tuning these engines. Basically you start the engine with a retarded cam,
at approx 4500 RPM the inlet cam is advanced and usually that is it till red line. The trick is to retard the cam again at approx 7000 RPM and
"bob's your vey close relative" 153 BHP @ 7800 RPM !!
So that little trick gained 6 BHP over my previous best on these rollers and the car is going great 
My engine is a 1600cc Toyota "blacktop" 20V 4AGE, factory individual throttle bodies and a Fidanza ali flywheel all controlled by an OMEX
710 ECU. The rollers were a SUN eddie current chassis dyno.
[Edited on 12/4/06 by bimbleuk]
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Cazzy R
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 posted on 12/4/06 at 05:06 PM |
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Well... I'm impressed! 
Cazzy R
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bimbleuk
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| posted on 13/4/06 at 05:32 AM |
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Oh well I thought there may be nore 20V owners out ther, obviously not
Oh and I meant the tensioner was not correctly tensioning above not that itwas loose on its mounting.
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Flat Pack
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| posted on 13/4/06 at 08:52 AM |
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I'm here, but I'm just happy I've managed to get my engine to run on more than 2 cylinders so far
Sounds like a useful tip though, I'll give it a try when I get to that sort of stage!
Wandering slightly off topic now, but what sort of air filters are you using? The end of my clutch cable is pretty much in the way so I have no idea
what I'm going to use (I think the blacktop and silvertop trumpets might be different, so this might not be an issue for you).
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bimbleuk
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| posted on 13/4/06 at 09:03 AM |
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Have a look at the pic below. The blacktop plastic trumpets are a differnet shape to the silvertop design. You can see the route of my clutch cable
which is basically just under the curve of the trumpet. I did have socks on them but they restricted power so I've removed them for now (not
recommed I know).
I'm hoping to get a box of varied straight trumpets from OMEX to play with but i'm fairly sure there will be very little to gain except the
looks
 
Balance bar brakes 2
[Edited on 13/4/06 by bimbleuk]
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Flat Pack
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| posted on 13/4/06 at 10:09 AM |
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Yes the blacktop trumpets avoid the problem that I have... the silvertop ones curve back in the direction of the throttle body more and the white bit
of the clutch cable is right under the mouth of the trumpet. I'd post a pic, but I'm at work and haven't got one that shows it too
well...
I'm not a big fan of the sock filters either, so I might get some different trumpets so I can fit something a bit better.
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