1.32 or 1.15 ?
11-08-02, 11:09 AM
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Rotary Freak
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1.32 or 1.15 ?
ok so I got the car started and would be breaking in soon , for those who dont know I now have a newly rebuilt motor that I also had half bridged , race clearenced with the oiling mods . I also have a T66 or T 70 (?) with a devided tangential 1.15 turbine housuing and a P trim turbine wheel mated to a fully devided exhaust manifold with separate wastegates , question is , how would a devided tang. 1.32A/R housing work , remember that its to be mainly used as a street car with some strip use.
11-08-02, 03:06 PM
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i have recently discovered that the 'p' trim is too small for high output Rotaries ESPECIALLY bridge ported. if you run your car and create anything higher than a 1:1 backpressure to boost ratio you will 'backup' the engine due to the massive overlap of the bridge port. Pluto just went through this ordeal and so did i. basically what happens is that any boost in the exhaust manifold that cannot get out goes backwards and since your overlap is tremendous all of it goes right back into the intake charge and power will drop. you really need a 'q' trim but if you already have your turbos go with the smaller compressor and the larger 1.3 housing and hopefully you will be able to get away with it, usually under 20 psi you will be ok but when you get around 25 psi **** starts going backwards.
whatever housing you get drill and tap a 1/8 NPT hole in it and run a cheap industrial pressure gauge to it, while you are on the dyno have someone keep an eye on the gauge and note what kind of pressure readings you get. for instance: at 20 psi on the intake manifold side you dont want to have more than 21 psi on the back pressure side. hope this helps. i will tell you that when i went from a .96 to a 1.3 the 1.3 spooled faster!!!
MWW
whatever housing you get drill and tap a 1/8 NPT hole in it and run a cheap industrial pressure gauge to it, while you are on the dyno have someone keep an eye on the gauge and note what kind of pressure readings you get. for instance: at 20 psi on the intake manifold side you dont want to have more than 21 psi on the back pressure side. hope this helps. i will tell you that when i went from a .96 to a 1.3 the 1.3 spooled faster!!!
MWW
11-08-02, 08:52 PM
#5
Mad Man
Since I can't seem to get an answer on my own thread, please allow me to try yours. I want to make 550-600rwhp in my 13brew street ported FC. I have all the neccessary supporting bits, I'm looking for a turbo. I'm thinking a t66, Qtrim .81ar. Comments? This is a dedicated road race car with occasional visits to the strip. TIA, Carl
11-09-02, 02:53 AM
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Originally posted by Carl Byck
Since I can't seem to get an answer on my own thread, please allow me to try yours. I want to make 550-600rwhp in my 13brew street ported FC. I have all the neccessary supporting bits, I'm looking for a turbo. I'm thinking a t66, Qtrim .81ar. Comments? This is a dedicated road race car with occasional visits to the strip. TIA, Carl
Since I can't seem to get an answer on my own thread, please allow me to try yours. I want to make 550-600rwhp in my 13brew street ported FC. I have all the neccessary supporting bits, I'm looking for a turbo. I'm thinking a t66, Qtrim .81ar. Comments? This is a dedicated road race car with occasional visits to the strip. TIA, Carl
And I told you in your last thread to get the Garrett GT35/40. Failing that, get the T66 with a n exhaust hoiusing aroiund the 1.15 mark and you will make that power.
11-09-02, 02:24 PM
#7
Mad Man
ajc, I have yet to see anyone dyno a 35/40 over about 450hp. Do you know of anyone who has come close to the 550 number? If so is there a dyno? With regard to the T66, I come from pistons so forgive me for the small ar. If you were buying a T66 who would you call? Also can I get that with a 3.5" vband to fit my existing dP?
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11-10-02, 02:14 AM
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ok . so is there a turbine wheel larger than the Q trim ? , since I read your reply TURBOSTREETFIGHTER , I have been thinking of replacing my turbo all together but I cant decide what I should go with , can anyone point me in the right direction ? , remember its a street / strip car with a half bridge , I should be able to spin to 9000+ RPM with the clearancing I did and I am looking for BIG power.
11-10-02, 04:17 PM
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Carl - A777 has a 1st gen with GT35/40 running 10.22 and is making 450rwhp at least ona dyno dynamics dyno which read between 10 and 15% LESS than a dyno jet. So yes there are people making the numbers on those turbos. However, they are getting towards the peak of their flow at that kind of power.
For a T66 I would call RotorWorx in Melbourne Australia. They have a hybrid T66 making MASSIVE amounts of HP and the price would come in under $1000USD
For a T66 I would call RotorWorx in Melbourne Australia. They have a hybrid T66 making MASSIVE amounts of HP and the price would come in under $1000USD
11-10-02, 09:01 PM
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Marcell, get a 66 comp, 'q' trim turbine with a 10 degree clip and a 1.15 turbine housing. this turbo will keep your lag to a mnimum and supply more than enough power at 25 psi. be sure and get the 4" inlet and 360 degree thrust bearing. remember to check your backpressure to see if you need a larger turbine housing.
MWW
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