Toymods Car Club Inc: Tech & Conversions => 1JZ Turbo Position idea..Better than twin dumps??

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celicamad
Forums Junkie

Location:
newcastle
Registered:
June 2002

Re: 1JZ Turbo Position idea..Better than twin dumps??	Fri, 15 November 2002 23:30

i dont care if youve seen 10.8 quoted.they are also supposed to do SUB 5 sec 0-100 YET autospeed did a test and only 5.6 (at best) was achieved on a BIG launch .perhaps a quick trip to Eastern creek will tell a far sadder tale PLENTY of 14 sec times there for modified GTR's. 13.5 THATS WHAT HIS CAR RUNS .....CONSISTENTLY .the cressida runs consistant 13.0 but has run 12.8(once) i blew a stock Supra 2jz silly about 3 months ago, why ?they are HEAVY .But i dont even begin to compare the two engines .with about $2,000 worth of mods the 2j engines will make close to 400 RWHP and run into the 11's PLEASE dont start the 2jz debate and please dont embarrass yourself any further .a GTR is NOT EVEN 1/2 the engine of a 2jz SURE the GTR'S have been modified to mega horsepower .but so has a holden rodeo engine The Idea with dumps is to remove as much air and as much heat as quickly as possible . a simple exhaust backpressure test showed the twin pipes more than free flowing enough .In fact the exhaust system itself posed the greatest restriction You obviuosly havnt even looked in the engine bay .the pipes still need to clear the steering rack so either way they end up coming through the same point .so when you alter the angle you add a bend You did say turn the rear turbo so they both face front ward that would mean both exhaust outlets facing rear ward .The SHARPNESS and size of the pipe to do the back turbo bend would be more restrictive than twin pipes how will angling the turbo be any different to twin pipes ?? i have twin 2.5 inch dumps 1/2 the way down the car . Then you need to consider all sorts of things for your spacer block what material ?? will it crack do you bolt it or weld it to the exhaust manifold ?? WHY would you change only one turbo you will effectivley with the wedge shaped block change the runner length and the direction that exhaust gas hits the turbine wheel (unless you port the spacer VERY,VERY well.And if you can port that well then WHY are you even asking ) . so now with one turbo responding and boosting differently to the other your going to add (i bet) BIG intercooler plumbing .when sizing intercooler piping and even intercooler size you need to look at two things 1 the size of the compressor outlet 2. the temperature of the charge air to determine intercooler size Although the 1js plumbing is ordinary the size and most effecient route of the plumbing is easily rectified in the standard position .surprisingly small plumbing will easily fix this you have to remember your only dealing with enough airflow to make around 400 H.p . The reason huge plumbing is used in mega h.p application is for FLOW and plently of it .BIG plumbing means more power BUT more lag . In the case of the FACTORY turbo NOT MUCH MORE power is available they are usually already running outside their ideal efficiency ..lag on the street means u lose or do 150 KPH to win a race So your setup WILL create a lag monster .thats provided the spacer doesnt leak or crack do you even know what material the factory exhaust manifold is made from ??? Having said all that your HALF way to a good idea . the idea is to get two front turbos .extrude hone the factory manifold and make two manifold spacers(match ported) BUT locate them between the engine and the factory exhaust manifold . Place a manifold insulator between the spacer and the exhaust . This way the material used for the spacer is no big deal the insulator means different expansion rates are not a problem The final entry angle for the turbos in uneffcted Angle both turbos downward at the rear and your past the steering rack in two bends each pipe and not even 90 degree each bend .The big peformance advantage here is the manifold insulator reducing heat transfer and you get rid of one bend each pipe . Having already gone tho this much trouble you might as well port the turbos for $800 why not!!!! end result youll max the injectors out at around 10-12 psi boost even if you dont port the turbo the flow advantage from $200 worth of extrusion honing will give MORE power and LESS lag AND get MORE heat out past the turbo The only catch is to take advantage of the new flow the exhaust MUST be VERY free flowing ALTHOUGH as Yojimbo said this setup is a poor mans excuse for a gt30 turbo and manifold and for the extra $1500 the gt turbo will last for 150,000 KLM (AT LEAST) finally intake mods twin filters etc are great provided the filters FULLY encased and insulated from engine bay heat and have HUGE cold air ducting to them otherwise its a case of an INTERHEATER But wait about 4 weeks and i'll post dyno and performance time results from a 1j with ported turbos.Im using a mates car as a test bench (hes silly enough to trust me) SORRY FOR THE WORLDS LONGEST POST BUT I THOUGH IT SIMPLER TO ANSWER THE WHOLE QUESTION [Report message to a moderator]

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