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Originally Posted by madrotor
(Post 4855108)
Brettus, did you ever consider getting a compressor wheel with less blades, this should offer more air flow at low pressure ratio, don't shoot though I am trying to think out loud
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Originally Posted by Brettus
(Post 4855130)
Exhaust : twin system with separate pipe for WG ...Guess it's Equivalent to a 3.5" diameter single pipe.
Intake to turbo : 3" Intake manifold: stock , VDI wired shut. Intercooler pipework : 21/4 straight off turbo to 21/2" rest of system Intercooler: 24"x11"x3" with 21/2" in/out Coils: D585 Plugs : rx7 NGK iridium race plugs 9 leading , 10.5 trailing Injectors : yellow/blue/uncapped yellow(maxed out at 420whp on E28) Fuel:E28 Boost control:Greddy profec spec2 with 4 port solenoid Wastegate : Tial 38mm Manifold:36.5mmID (sch10 SS) outer ports to turbo , siamese port to WG with crossover pipe to front port tube Turbo:GTX3582r with a hiflow turbine, 1.01AR twin scroll exhaust housing and a compact To4B comp housng Engine :dowelled with oem rx7apex seals, rx8 modified plug corner seals Porting : To be divulged at a later date .... Suffice it to say it is still a MSP Renesis Clutch : Exedy stage 2 ? Transmission : rx8 5 speed Tuning : Brettspeed via Mazdaedit |
Fuel pump added ..thanks yourmum
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Something interesting : The GTX3582 has almost identical characteristics to the 9180 compressor up until around 2.5Pr/58lbs and will match it all the way up till around 66lbs/min/(0.5kg/s) ...
https://cimg5.ibsrv.net/gimg/www.rx8...2b29f5af2b.jpg My numbers plotted on matchbot.... https://cimg7.ibsrv.net/gimg/www.rx8...fa81852a10.png While the 8374 looks a lot different - the similar to a GTX3576 up to that point. https://cimg8.ibsrv.net/gimg/www.rx8...64b8cd56c8.png |
Finally got the actual Dyno from last week .... 312kw (424hp)
https://cimg2.ibsrv.net/gimg/www.rx8...130da14d54.png |
Twisting the knife....:sad:
Joke aside, well deserved result! |
Brettus quote: "Something interesting : The GTX3582 has almost identical characteristics to the 9180 compressor up until around 2.5Pr/58lbs and will match it all the way up till around 66lbs/min/(0.5kg/s) ..."
Brett, Wouldn't we expect the system to experience unstable flow operating so close to surge line below 4k rpm on the 9180 compressor? Thx |
Originally Posted by jcbrx8
(Post 4855596)
Brettus quote: "Something interesting : The GTX3582 has almost identical characteristics to the 9180 compressor up until around 2.5Pr/58lbs and will match it all the way up till around 66lbs/min/(0.5kg/s) ..."
Brett, Wouldn't we expect the system to experience unstable flow operating so close to surge line below 4k rpm on the 9180 compressor? Thx |
Originally Posted by Brettus
(Post 4855599)
I don't know , I have never experienced surge ..... All I can tell you is that I'm not seeing any sign of that on the GTX3582
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Originally Posted by jcbrx8
(Post 4855647)
Ok. Just a curious thought. Nevertheless, the 83mm wheel appears well matched...particularly efficient in the "get at 'em" range.
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Originally Posted by AAaF
(Post 4855592)
Twisting the knife....:sad:
Joke aside, well deserved result! Not sure what you meant re the knife comment (maybe something to do with a certain naysayer ? ) . BTW I've made a few more minor tweaks and have booked her in for another dyno next week . I think it can do better than 424 ;) ............... |
Looking forward to hearing about these sneaky "minor tweaks". Fingers crossed they net you some gains.
I think "twisting the knife" was referring to making us even more jelous of your setup. |
Originally Posted by JimmyBlack
(Post 4855694)
Looking forward to hearing about these sneaky "minor tweaks". Fingers crossed they net you some gains.
1/Realign PPF (had a vibration even though it was set to Mazda specs) so engine and diff at same angle 2/Replace the greddy cast elbow off the IC with a swept bend . You reminded me about that one ...cheers for that. I was shocked when I pulled it off to find it had an ID of only 53mm ! 3/Increase wastegate boost cut rpms a little. 4/Tweak fueling so I can raise boost a little. |
Originally Posted by Brettus
(Post 4855705)
None of these will give much hp but every little bit helps :
2/Replace the greddy cast elbow off the IC with a swept bend . You reminded me about that one ...cheers for that. I was shocked when I pulled it off to find it had an ID of only 53mm ! |
Originally Posted by RotaryMachineRx
(Post 4855792)
Yeah when I did my build I just bought a Long Radius 90deg silicone coupler to replace this piece, another benefit is that it's two less connections in the charge piping.
I'm annoyed at myself for not seeing it earlier ! |
Originally Posted by JimmyBlack
(Post 4855694)
I think "twisting the knife" was referring to making us even more jelous of your setup.
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Brett, how much air are you moving at this WHP level ??
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Originally Posted by madrotor
(Post 4856180)
Brett, how much air are you moving at this WHP level ??
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Did you connect the SSV to the VDI connector for better control over when it opens ?? Forgive me if this has been asked before, I know it was mentioned either in this thread or Slash's build thread
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Originally Posted by madrotor
(Post 4856226)
Did you connect the SSV to the VDI connector for better control over when it opens ?? Forgive me if this has been asked before, I know it was mentioned either in this thread or Slash's build thread
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Brett, how do you log the exhaust temperature from multiple sources simultaneously?
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Originally Posted by madrotor
(Post 4856610)
Brett, how do you log the exhaust temperature from multiple sources simultaneously?
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You posted exhaust back pressure from your runners I think, I was just wondering how do you log it that's all
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Originally Posted by madrotor
(Post 4856636)
You posted exhaust back pressure from your runners I think, I was just wondering how do you log it that's all
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Ok - so I hit the dyno again yesterday ... different dyno again . Result ...pretty much the same . Please ignore the torque figure , it relates to dyno drum torque not engine torque . Actual torque is around the 300lb/ft mark.
https://cimg4.ibsrv.net/gimg/www.rx8...453ee77251.jpg I can conclude from all my trials and misadventures that this is as good as it gets for a Renesis engine . I'm 99.9% sure that not even a larger turbo/larger manifold/less restrictive system ...whatever you can think of, would offer much more than what you see here . The main issue that I've talked about all through this thread is the Siamese port and what happens when chamber exhaust pressures reach a certain level . Doesn't matter what you do , once that level is reached .... I believe there is massive reversion between the rotors through the Siamese port and this not only saps power but will result in sudden death if operated in this range . |
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