Toymods Car Club Inc: Tech & Conversions => AW11 gearbox ? handle 350hp 4agte, ?AW11 weight?

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toyboy
Occasional Poster

Location:
geelong
Registered:
September 2003

Re: AW11 gearbox ? handle 350hp 4agte, ?AW11 weight?	Mon, 29 September 2003 14:10

thanks for your replies pulcino and TE72 turbo, i was wondering how both your rides fair with regards to turbo lag ect... what final drive ratios you run, and also any other setup description, performance and overall satisfaction with your packages. if a two litre turbo makes X amount of power with a turbo charger at 15psi, would that same turbo charger on a 1.6 litre engine with the same compression ratio, have to run at 20% higher psi to acheive the same power figure, given that the 1.6 litre capacity is a 20% smaller area of volume for the charger to compress the charge required for that ammount of horsepower. thus requiring 18psi on the 1.6. if this is the case, would that turbocharger at its maximum safe limit of 15psi, on a two litre engine, run safely at 18psi on the smaller engine because it is still forcing the same amount of charge, or, is there more stress on the turbine given the higher psi, thus reducing the amount of charge safely forced into the chamber. this is important to me as the t28 ballbearing turbo that i want to run, has a ceramic turbine, and im unsure as to why the safe limit is 15psi for that particular turbo. also, at the risk of being labelled a dreamer, i would like to THEORISE the possibilities of turbocharging the 4agze whilst retaining the supercharger to eliminate the turbo lag problem. lets say that a standard 4age makes 80kw at 6400rpm and a 4agze makes 120kw at 6400rpm (as in truno gtz 1990). that equates to a 50% greater volume of charge entering, and being discharged from the 1.6 litre engine. given that fact, the turbochager hanging on the side of the engine thinks its hanging on the side of a 2.4 litre engine. (1.6 X 50% charge rate equals .8 of a litre, plus the original 1.6= 2.4). then a turbo spooling up at 2000rpm on a 2ltr engine, now spools up at 1600rpm on the 1.6 twin charged engine, given that the 2.4 ltre exaust gas rate is 20% greater than the 2ltr discharge the turbo is used to. also, you would probably want to change to a smaller turbo as the engine is already producing 160hp (120kw) of charged power, and you would be absolutely insane to want more than 400hp, 160hp plus 320hp (conservative) from the b/b t28 = 480hp. thus to acheive a goal of 400hp, you would require a turbo that produces 400 - 160 = 240hp. probably a tubo rated at 260hp. now that we can use a smaller turbo, it will again spool up in the vacinity of 20% quicker than the 1600 rpm required for the b/b t28, given that the turbo is of similar quality (b/b). now that turbo will spool up at 1280rpm. this would be razor sharp throttle response that would pull like a scalded cat shot in the ass with a bb gun from 1280rpm - 6400rpm. you would have to run variable turbo pressure, so it could be turned down for street use. interesting theory though, isn't it. please respond. [Report message to a moderator]

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