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Location:
Brisbane
Registered:
December 2004
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Re: stroke 4AGTE
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Sun, 03 April 2005 00:54
 
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instead of stroking it to get larger wang  , why don't you match up a turbo that will be better and more efficient for the application? as there are numerous models of GT series turbos that will cater for smaller capacity engines. I own a 4agze converted 4agte sprinter. I also went through this stage of sizing and matching up a turbo and after speaking to MTQ(turbo specialist in QLD), Jon patrick(turbonetics distributer for australia) and various guys that deal with garret Japan and USA. The conclusion I have come up with the guys all say the same thing, basically when going about when matching up you have to question what is the ideal power you want to make and what are you trying to achieve? as stroking it seems very unecessary for say if you are going for 200-350rwhp, and the only thing you gain is slightly more drivablility.
I myself have opted for a ball bearing hiflow. This was matched up for a rb25(neo series 2 motor) but I prefer alot more lag and a kick in the gutz mid to high range rpm. Reason I went the rb25 highflow was due to in comparison with other GT series turbos such as GT25(400hp version)/28's(from s15's), 2871, 2510/30, 25/40, and the disco potato GT28RS. Was all these turbos are around the 1800-2300 mark. Even though they indeed are a awesome turbo upgrades for ca/sr/rb20's, this didn't really suit my application as all turbos except for the s15 GT28 could and will pull all the way to redline and achieve the 250-280rwhp as wanted. As I could not really comprehend the extra money to throw at a turbo while I can spend more money on other things such as head and block.
The turbo that is matched is basically a GCG highflow(with smaller exhaust housing) these are rated at 340-380rwhp(fly). I myself did not buy a GCG one as they want $1950 for a highflow steel wheel turbo. I got mine highflowed from MTQ in qld for $920 with 1 year warranty. My turbo specs are a series 2 nissan skyline Rb25 turbo from a neo motor(I found one shagged and payed $50 for it) I bought a smaller exhaust housing from a rb20 turbo(16v)45mm inducer version for $20. The rear housing(from a rb20 turbo)is a .22 compared to the larger .3something from a series 2 skyline turbo that will be slightly more laggier. The exhaust wheel and shaft are steel and am running a larger steel compressor(52mm inducer)compared to the neo 49mm(nylon wheel) stock rb25 series 2 comp wheel(3mm difference). As this will have more legs top end. So the total cost of this turbo has set me back slightly under $1000 for a rebuilt high flow steel wheeled turbo with warranty. I also payed $60 for the turbo comp cover to be machined down of all nissan and garret castings on the cover and got it fully polished which looks a treat .
Ok verdict for turbo bolt on, basically after bolting on the turbo the car felt alot more aggressive and slightly more responsive considered to the original rb20 turbo that was fitted. The turbo would come in at about 3250 and pull all the way to redline, while hard shifting through gears and the car would axle tramp and spin the wheels at 100k's(never did that with the original turbo). I have found this turbo to be a very nice upgrade for the 1.6ltr and could highly recommend it to anyone. I have yet to dyno it as the motor and gear has been pulled out of the car to be ready for paint but would definately estimate the power to be slightly over 250rwhp on a light road tune. Will have the car back together in the next month(fingers crossed) and will get a full tune on higher boost to see what I can get(dyno sheets will be shown of course).
Hope this helps
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