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Location:
Adelaide
Registered:
May 2002
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Re: Need help 0n 4AGZE
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Tue, 27 May 2003 11:44
 
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Let me guess, youre pulling well over 5000rpm a fair bit and dissappointed with how it feels up there.
The 4AGZE is what i'd call a grunt engine, it is designed to make its power in the low to mid range. Sure it'll rev to 7500rpm but flattens off after about 5500rpm because of its high rpm breathing ability, or lack thereof.
Take the 20V for example which too is 1600cc and part of the 4AG family. It is the exact opposite. Its magnificent inlet lets it breath so well in the top range that its whole structure is almost based around it. Its designed to spin to 8000 or so rpm to get the most from it. But its not even in the same league when it comes to the low and mid rev range that the S/C endows the 4AGZE with.
I reckon that theres nothing wrong with your 4AGZE. 6-8psi is about right and so is 80 or so rwkws for a stock package.
Its not that the S/C loses boost. It is a combination of a few things.
Firstly the ABV opens at about 8-10psi to keep boost at this level. so you're not losing boost, is staying at the same level where it should be.
Sure the ECU will pull some timing out of it, but this comes back to the fact thet the S/C is not designed to be spun really hard and so when it is it heats the air and the ECU retards ignition to keep the motor in one piece (stop it from knocking).
If you think that there still is a problem with your power output consider the following modirications then. This is what i'd do if i was to build a 4AGZE...
- 4AGZE
- 1GGZE supercharger pulley'd to make about 12psi
- Set of well designed 4 into 1 extractors
- Re-designed inlet
- Very good intercooler
- Aftermarket ECU
As a final thought, dont gert too caught up with dyno figures. sure they're a great yardstick but are to imprecise to bank on. Readings are affected by ambient temp, gearing, tyre grip and the list goes on. differences of up to 10% have been noted between different dyno's. As a tuning tool though, ther are invaluable
So dont get disheartened and let your car/work come down to a single number on a computer screen. Instead look at the shape of the curve and judge the car on how it feels when you drive it.
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