Brettus turbo 111 (the ultimate Renesis turbo ?) - Page 65 - RX8Club.com



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Old 03-20-2018, 02:17 PM   #1601  
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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
There is heaps of flow left in the compressor I have now ..... If only I could use it !
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Old 03-20-2018, 07:50 PM   #1602  
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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
Did I miss the fuel pump? probably should edit this post to include that
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Old 03-20-2018, 09:07 PM   #1603  
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Fuel pump added ..thanks yourmum
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Old 03-24-2018, 06:29 PM   #1604  
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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) ...



My numbers plotted on matchbot....



While the 8374 looks a lot different - the similar to a GTX3576 up to that point.


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Old 03-25-2018, 03:52 AM   #1605  
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Finally got the actual Dyno from last week .... 312kw (424hp)

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Old 03-25-2018, 03:20 PM   #1606  
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Twisting the knife....

Joke aside, well deserved result!
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Old 03-25-2018, 04:15 PM   #1607  
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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

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Old 03-25-2018, 04:23 PM   #1608  
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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
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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Old 03-26-2018, 09:08 AM   #1609  
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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
Ok. Just a curious thought. Nevertheless, the 83mm wheel appears well matched...particularly efficient in the "get at 'em" range.
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Old 03-26-2018, 01:22 PM   #1610  
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Ok. Just a curious thought. Nevertheless, the 83mm wheel appears well matched...particularly efficient in the "get at 'em" range.
Yes, the 83 is def. a better match for the Renesis for all types of driving except on the track.
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Old 03-26-2018, 01:41 PM   #1611  
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Twisting the knife....

Joke aside, well deserved result!
Thanks man.
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 ...............
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Old 03-26-2018, 03:44 PM   #1612  
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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.
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Old 03-26-2018, 05:23 PM   #1613  
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Looking forward to hearing about these sneaky "minor tweaks". Fingers crossed they net you some gains.
None of these will give much hp but every little bit helps :

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.

Last edited by Brettus; 03-26-2018 at 05:41 PM.
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Old 03-27-2018, 03:39 PM   #1614  
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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 !
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.
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Old 03-27-2018, 04:08 PM   #1615  
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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.
Absolutely !
I'm annoyed at myself for not seeing it earlier !
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Old 03-28-2018, 06:50 PM   #1616  
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I think "twisting the knife" was referring to making us even more jelous of your setup.
100% correct sir. Me more than you I guess
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Old 03-30-2018, 11:37 AM   #1617  
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Brett, how much air are you moving at this WHP level ??
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Old 03-30-2018, 03:42 PM   #1618  
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Brett, how much air are you moving at this WHP level ??
It's around 420g/s(56lbs/min) from the maf readings ,but hard to know how accurate those are. It seems to line up pretty well with the Matchbot calculations.
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Old 03-30-2018, 03:44 PM   #1619  
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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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Old 03-30-2018, 03:55 PM   #1620  
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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
I have tried that in the past ...but no , not at the moment . I just reset the SSV table to have it open at 4000 . Which does help the turbo to spool up a little quicker and avoids the hesitations you get if you keep the stock settings .
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Old 04-04-2018, 10:17 AM   #1621  
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Brett, how do you log the exhaust temperature from multiple sources simultaneously?
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Old 04-04-2018, 12:19 PM   #1622  
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Brett, how do you log the exhaust temperature from multiple sources simultaneously?
What are you trying to do with that ?
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Old 04-04-2018, 12:37 PM   #1623  
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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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Old 04-05-2018, 02:56 AM   #1624  
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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
ah .... you said "temperature" above . I logged it via my AEM failsafe gauge .
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Old 04-05-2018, 04:53 PM   #1625  
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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.



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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