randy 77zt Posted September 10, 2002 Share Posted September 10, 2002 about 1.5 years ago i got this deal on a t3/t4 turbo from a sandrail supply place in pheonix.the compressor turned out to be a 60-1 hi-fi and the turbine was smaller than oem datsun 280zxt.so i sent it out to have the datsun exhaust housing machined and a different turbine wheel installed.car is a daily driver but is used at thunderhill 3 times a year.i am switching to sds,porting head,extrude honed exhaust manifold,65 mm throttle body,down pipe,intercooler.i want it to dyno at 330 to 350 at the wheels on a 95 degree day on pump gas .when i go to the track i run 10 gallons of union 110.last time i went to the track it was 110 degrees but no pinging on 110 gas.at the track lowest rpm is about 3500,high 6500. Quote Link to comment Share on other sites More sharing options...
Lockjaw Posted September 10, 2002 Share Posted September 10, 2002 Housing or wheel? For a housing, the .63 one is nice, the .82 is better for top end power. For a wheel, the stage III T3 wheel is good and will easily supply the HP you want. Quote Link to comment Share on other sites More sharing options...
Guest De Schmaydee Posted September 12, 2002 Share Posted September 12, 2002 ...what was recommended to me (what i bought) was a T3/T40B...stageIII/57 trim...but i want mine set up for road-racing.....s Quote Link to comment Share on other sites More sharing options...
yo2001 Posted September 12, 2002 Share Posted September 12, 2002 Okay, T04B doesn't have a .57 trim. That's T04E. V trim would be my choice if you are going to be T04B I was told to get .50 trim T04E with stage III turbine at the turbo shop. Sorry I got carried away with the compressor maps. Quote Link to comment Share on other sites More sharing options...
R0N Posted September 12, 2002 Share Posted September 12, 2002 That's incorrect, there are t04b housing with a .57 trim wheel. It's the manufactures that don't make .57 trim in a t04b housing. The graph's are from the manufactures specs not the turbo dealer / shop (turbonetics, majestic, etc..). Quote Link to comment Share on other sites More sharing options...
yo2001 Posted September 12, 2002 Share Posted September 12, 2002 oh, okay. But I tought the T04B housing is not as efficient as T04E housing? So why would you want to put .57 trim wheel in a T04B housing? For clearance? Quote Link to comment Share on other sites More sharing options...
R0N Posted September 12, 2002 Share Posted September 12, 2002 Mainly for clearance. The T04b housing is machined to fit the .57 trim. You do have a better spoolup but loose on top end. You lose about 5%. Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted September 13, 2002 Author Share Posted September 13, 2002 i am talking about exhaust turbine-stage 3 or stage 5?compressor side is a 60-1.stock zxt turrbine housing is being machined for turbine.i figured some of you guys have tried different turbos.who is a member of the turbo of the month club?i have another engine on a stand i can rebuild.and 2 more p90 heads and 2 more exhaust manifolds.thinking about getting an sba loan for an extrude hone machine-they want too much money and i cant see how you can get into 100% of a zxt exhaust manifoldwill be hitting p&p looking for a diesel crank this weekend. Quote Link to comment Share on other sites More sharing options...
Guest De Schmaydee Posted September 17, 2002 Share Posted September 17, 2002 oh yeah, .....i had my turbo custom made for my application...i wanted something very responsive..i'm not gonna drag race it...its for road racing around on curvey roads...where i'm speeding up and slowing a whole lot.....s Quote Link to comment Share on other sites More sharing options...
Guest Aaron Posted September 17, 2002 Share Posted September 17, 2002 Can someone explain quickly how to read those flow maps? I am dumb at the moment. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted September 19, 2002 Share Posted September 19, 2002 These are explained very well in Maximum Boost or other Turbo books, but here is a 2c version: The pounds of air per minute is something you determine for your engine based on RPM, displacement, and amount of boost. For example, 2.8L x 7000rpm x 1.5 x scaling constants and whatnot. The 1.5 would be 7psi boost (sea lvl = 14.7psi, x 1.5 = 14.7 + 7 (roughly)) Pressure ratio is the air pressure at inlet of compressor wheel to pressure at outlet of turbo. 14.7 psi boost = Pressure Ratio of 2. The percentages are the effeciency of the compressor. The short of this is how much heat is added. The long is the ratio of compressed air pressure vs. Density. Want highest effeciency, of course. The numbers with lines drawn across are turbine/compressor wheel RPM Surge is a very naughty area of compressor unstability. So, the goal is to look at your RPM range you want power in, the amount of boost you want (pressure ratio), and try and get all of that in a high-percentage efficiency area and stay away from surge. I think that's all right. Others chime in if i made a mistake. Quote Link to comment Share on other sites More sharing options...
clint78z Posted September 19, 2002 Share Posted September 19, 2002 Guys before you go into COMPRESSOR sizing speech, he is staying with the 60-1 hi fi COMPRESSOR. Randy is dealing with the other half of the turbo EXHUAST TURBINE size. A stage III turbine should be find somewhere in the .63 to .69 a/r ratio. One optiion you could do is leave your tiny turbine alone, get a big external wastegate. When you have a big bypass, the restriction will not be very much restriction at high load conditions. Be sure to get manifold & turbine housing ceramic coated (increased heat to the wheel means better spoolup time). I wouldn't go stage v on a road race car, that is more suited to a drag application. Quote Link to comment Share on other sites More sharing options...
Guest Aaron Posted September 19, 2002 Share Posted September 19, 2002 Cool, Thanks gravy. I have TurboCalc which will give me the lbs of air required, and I had guessed the % was the efficiency of the compressor, but I had no idea what the pressure ratio and those lines with numbers accross them were. Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted September 20, 2002 Author Share Posted September 20, 2002 i really dont want to weld on stock exhaust manifold because car will be used for a daily driver and i am afraid of cracking.the turbo bolts on with tight clearence on compressor.main point to question is stage 3 or stage 5 turbine?track rpms run from 3000 to 6500.i am looking for 350 hp at the wheels on pump gas.i run race gas on track for motor insurence Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted September 20, 2002 Share Posted September 20, 2002 Stage 3 should be plenty for 350 whp. When I talked to Turbonetics about my new turbo, they suggested a 3 for street use and said it would be plenty for 500-550 whp. Possibly much more with the right wastegate design. Quote Link to comment Share on other sites More sharing options...
Ron240zxt Posted September 20, 2002 Share Posted September 20, 2002 Im running a 60-1 hifi with stage 5 exhaust wheel, does take a little to spool that puppy up, I felt going to a 82ar with stage 5 wheel was a easy alternative to a full t4 combo and still aloud me to run the factory POS manifold. Quote Link to comment Share on other sites More sharing options...
Guest De Schmaydee Posted September 21, 2002 Share Posted September 21, 2002 randy, ...you dont really need to weld the wastegate flange on the manifold...you can get (have made) an extender...like: it bolts to the exhaust....goes out 2"-3" and the turbo bolts to that...your flange welds in the middle of the extender...it can also help you w/any clearance probs and make it easier to work on (the stock turbo is a mother to get on/off)......but external wastegates arent cheap and are alot more work to get put on.....i have a turbonetics deltagate2....what are you wanting to use the car for?...drag? road?.....s Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted September 22, 2002 Author Share Posted September 22, 2002 the turbo is done-its a stage 5 turbine machined to fit oem nissan housing.waste gate hole was machined slightly larger too.compressor is a 60-1 hifi.i am going to get the exhaust manifold extrude honed .the head will be done by the guy that ports the heads for the toyota atlantic cars.if the housing was machined close to the turbine it wont bypass too much exhaust gas.going for a new engine by next spring.engine being built is back-up engine that came from pick&pull.it loooks like a brand new nissan reman motor.its very clean. Quote Link to comment Share on other sites More sharing options...
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