hypergear
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Everything posted by hypergear
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Majority of people wants them high flowed so I didn't look into making a drop in core. I mean if you can't take your car off the road I can send you a high flowed OP6 turbo. -
For an Rb30det the turbine housing is too small. You can get more power and hold boost better by just replacing the .63 turbine with a .82 turbine. It should get you about 300rwkws, but I don't think it will do more. Alternatively I do have 10cm turbines that is made for external gating that I can machine up to suit the current core and you can get Scotty to drill and weld an gate on the side of it.
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The 310rwkws run above was from our standard R33 21U high flow. Well, I won't be able to rebuild stock Rb25det turbocharger, because in most of cases it the shaft does snaps off the turbine wheel when I undo the nut. I can high flow it using a smaller profile If you like stock response and drive ability. They are pretty sweet on stock boost working with factory ecu. Dark blue is the G1 high flow, while light blue is standard turbocharger: Based on a R34 GTT with Rb25det Neo motor, with supporting mods and pump 98 fuel: ^^^ It won't make a lot of power tho, I recommend standard profile if supporting mods are planed. The cost to high flow either profiles are the same.
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Further updates: John Reco's R33 skyline. standard engine with cooler, exhaust, fuel and ecu mods. 310rwkws @ 20psi E85 fuel.
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They are high flowed on different boost levels. They are actually same chra used in Std 21U/OP6 high flows. Steel wheels and very reliable. Above is from an Auto 1JZGTE, compare to the manual version it is roughly 10% behind in power.
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Customer's result from JZX100 Chaser. 1JZGTE VVTI Auto. Our standard profile high flow of factory CT15B turbocharger, with fuel and ecu mods. 272rwkws @ 19psi Pump 98 fuel
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Few more updates. This might be relevant as it is the current version of ATR43SS1PU model for RB25det. Moved on to SR20det. and the final result was maxing out at 275rwkws. It was using Caltax P98 fuel. It have resulted identical numbers to what the same turbocharger was performing on my RB25det test, except the same turbocharger maxed out at much lower boost pressure with much better boost response. Result: The AFR curve Tuning data: Fuel table
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If you are using a standard RB30 NA buttom end with a Rb25det R33 engine head it should give you an compression ratio of 8.3:1, roughly 135psi per CYC. I think its a good compression ratio. With the ignition angles, its about where the engine produced the best torque, with E85 fuel and lower compression it allows you to have it set at optimum angles and run heaps of boost without pining. Then you might want to go for an .82 turbine housing for the high flow, or some thing like an ATR45SS-1 that can supporting around 450rwkws mark.
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Also please make sure all the oil restrictors has been drilled out. The high flowed turbocharger do require greater oil flow to work properly.
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LoL worked extremely well on my steam pipe low mounted KIA SUV with 50mm external. in this case yes, I can high flow them for $800 each.
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Thanks for the advise. How ever installing sensors can only determine the amount of air flow based on my particular engine package. I'm more interested on formulas calculate air flow from on every one elses engine packages using data that is available on the dyno sheet and ECU files. I believe the best way of doing it is by calculating based on the amount of fuel burnt at given RPM and give AFR. I'm currently using the fuel injection formula calculating mass of air required to burn given amount of fuel required at certain AFR at given engine cycle. It didn't work out well unless I'm making errors. Have you or any one tried this method? Plastty: Yes, I can high flow them to any of the ATR28 profiles, bigger they are the laggier they be comes. Alternatively use an high mounted SS2, probably work out at similar cost and way better performance.
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Hy_rpm: That is some excellent results. GeorgesR34: Overall the new SS2 do have a larger turbine and a more efficient compressor. How ever used as a bolton turbo with factory manifold internally gated, I don't think it will make a lot more power then what you currently have. Its a combination of what every thing can flow judging the characteristic of the turbocharger it self. I'm trying to work out Total air flow for individual turbocharger on complete setups based on HP at moment, im getting some unrealistic figure and its kicking my head in. I would like to come up graphs that contain specific air flow Vs RPM of the engine used for evaluation based on different HP levels. That way, we can see how much air each engine package is moving at given power level using different combination of turbochargers. Prediction of HP that way would be much more accurate. It would also allow every one to see the affects of each and every aftermarket parts installed in terms of total volume of air shifted. On the end, with all data organized, we can calculate the final outcome based on the turbocharger used in combination with aftermarket parts used. We can also calculate based on the amount of fuel injected in combination of AFR to figure out how much air was burnt also. That would give an pretty accurate determination on the percentage differences of dyno outputs. What I have is the details of engine (RB25det or SR20det), HP, AFR, Boost levels, injector sizes, RPMs. From the Adaptronic ECU files, I also have the injector VE used. If any one had some experiences in working outs, please share some lights.
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Some updates. This is in relation to the OP6 and 21U ball bearing high flows. For people whom prefer BB centers. Its been in my car for a while been through a number of high boost dyno runs and I'm pretty confident that this version will last and work fine. How ever I'm unable able to clock alot of KMs on my test cars. I currently have two of those CHRAs built, I will do them at the same cost as the standard high flow. Please PM or call if any one is interested to evaluate, preferably some one use it in a daily that can clock a lot of KMs. In case of failure I rebuild them to standard bush high flow. Currently working on a new prototype of T28 very specifically for S14 and S15 VTC SR20det motors, Will update date details once made working.
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I take it if he doesn't want it. I have plains making it into a twin 38mm externally gated manifold
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First of all thank every one for their support. I will keep on trying producing even better performing turbochargers while keeping them affordable. I'm currently working with an engineers on the CNC program for the compressor and bearing housing machining based on a TD06 compressor housing and bearing housing castings. Once the machine operates it will be able to knock close to $100 off the cost and it will be passed onto our customers.
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Can't machine a cast wheel, material is too soft. it starts as a copy of the cast wheel, which is a Billet comp wheel that is identical to a normal cast wheel, I then took it for a dyno run for a base output. From there I modify the wheel blade shapes, tips, height, hub sizes and etc then evaluate each and single modification done to see what sort of differences it has made compare to base output on a dyno. Drawing of the better performing wheel where sent to produce in a batch. Like I've mentioned, my Skyline have done 1807 dyno runs since the start of this project, and probably made this thread containing more dyno readings then the dynosheet section plus a lot more that wasn't posted.
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The SS wheels are originally just a machined version of the cast wheel, trailed and modified through time by my self. The CNC programming was done by an engineer that I hire, I also hire and work with many other engineers for different purposes on the development and manufacturing of a turbocharger. Other thing worth mention is the CNC machine that does the profiling and machining of the comp and turbine housings are not the 5 axis machine that does the billet wheels. Those are CNC lathe and mills. One does all the machining of the horizontal profile and groves, and the other one does all the drilling and tapping of the holes. In which the Greedy comp and turbine housings that are made to run on C clip and V clamps are cheaper and quicker to produce as all aspects of machinery was done on one horizontal CNC lathe.
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For the quantity that I'm currently doing its not worth to own. Also its only worth while using CNC making a number of identical housings at once, which in my case its different combinations for different customers. So most of the housings are still hand made on lathe on milling machine.
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This is the larger version of the 2nd generation SS2. It is 1.5mm bigger on compressor side and 3mms larger on turbine side. More power. On the less complicated to build turbochargers. Since we have found good uses of a CNC machine that we can rent, we will be making TD06L2 based turbochargers are a very cheap price. that will be the SLSS2 and Sl20.5G turbochargers. Will update new pricing and details shortly.
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Best to upgrade induction and exhaust first then play with the EBC as the end result will vary. I'm posting up an promotion on our new ATR43SS-2 internally gated bolton turbochargers so more people can enjoy our latest development. The Retail price on this item is currently $1450, you can have own them now for $999 including braided oil feeding line. The Special offer is for 20 units only. That is currently the best performing RB25det bolton turbocharger. Product details and Dyno results are: http://www.hypergearturbos.com/index.php?route=product/product&path=72&product_id=81
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Been told by customer its pretty responsive. It cost $850 to high flow.
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Ball Bearings For Turbo Where To Get
hypergear replied to joe blo's topic in Engines & Forced Induction
During the VNT CBB development the shaft speed of the SS2 Alpha have maxed out the gauge of 180,000RPMs around 5000RPMs, so by the end of the run of 7200RPMs it would be over 200,000RPMs. The 12,000RPMs bearings don't work, they could be easily obtained, those were the first ones I've tried and Very nosy. Apart from balancing, and shaft speed there are many other critical areas to be considered. It took me close to a year to workout all aspects and having it working reliably. -
Ball Bearings For Turbo Where To Get
hypergear replied to joe blo's topic in Engines & Forced Induction
what sort of turbo is it? -
This is a newer high flow profile available for Rb20det owners. It is very specifically aimed at response. The profile configuration works out very close to a 2871 in 52T. Maximum power wise would be expected around the 230rwkws mark depending on supporting mods and amount of boost given.
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I got HX35 laying around for preferably some one had a 3076 or similar to try it. It was a repair job for a school bus and the customer didn't came back. They can make the power, how ever there are many options out today which are capable of the same amount of HP with better response and drive ability.
