Brettus turbo 111 (the ultimate Renesis turbo ?)
10-09-2015, 05:38 PM
#658
You can however use the flow vs pressure calculator with differential pressure and see how much differently the injectors will flow at 45psid vs 60psid.
Flow vs Pressure Calculator | Fuel Calculators | Resources | DeatschWerks
It just the square root of the pressure difference.
10-20-2015, 04:54 PM
#659
Anyhoo ..............
Update time :
Looking at my stripped engine has given me some valuable insight on where to take things from here . The engine did enough miles(25,000) and enough track days to at least provide give me some indication on whether what I'm currently doing is working .
Apart from the broken corner seals (and the damage caused by that) the condition of the inside of the engine is pristine. Virtually no carbon buildup and very little wear on either the side plates or the housings.
There is also no sign of any wear or overheating around the exhaust ports .
While i can't say for sure which of these things helped the most ............ it's the way I will continue to run my engine.
*Increase stock OMP calibration by 10% (stock setup - no Sohn)
*Run synthetic 5w40 with regular oil changes
*75/25 water/meth injection at around 350cc when over 10psi
*Limit rpm to 8200
*Increase oil pressure
The modification i did to the siamese sleeve earlier and again more recently (which saw track time) does not appear to have had any negative impact .
This has given me confidence to stick with another (slightly less aggressive) design . Not only will it flow more than stock but should lessen the likelihood of the divider falling to bits as it is prone to do.
I would really like to see if this design does anything for an NA ......... anyone willing to try it ?
The only other modification to this next engine, that wasn't on the last one .....will be solid corner seals .
Update time :
Looking at my stripped engine has given me some valuable insight on where to take things from here . The engine did enough miles(25,000) and enough track days to at least provide give me some indication on whether what I'm currently doing is working .
Apart from the broken corner seals (and the damage caused by that) the condition of the inside of the engine is pristine. Virtually no carbon buildup and very little wear on either the side plates or the housings.
There is also no sign of any wear or overheating around the exhaust ports .
While i can't say for sure which of these things helped the most ............ it's the way I will continue to run my engine.
*Increase stock OMP calibration by 10% (stock setup - no Sohn)
*Run synthetic 5w40 with regular oil changes
*75/25 water/meth injection at around 350cc when over 10psi
*Limit rpm to 8200
*Increase oil pressure
The modification i did to the siamese sleeve earlier and again more recently (which saw track time) does not appear to have had any negative impact .
This has given me confidence to stick with another (slightly less aggressive) design . Not only will it flow more than stock but should lessen the likelihood of the divider falling to bits as it is prone to do.
I would really like to see if this design does anything for an NA ......... anyone willing to try it ?
The only other modification to this next engine, that wasn't on the last one .....will be solid corner seals .
Last edited by Brettus; 10-20-2015 at 05:06 PM.
10-21-2015, 07:34 AM
#660
rev it up
Interesting choice of corner seals. I have heard of a Australian based builder using solid corner seals with some success.
However, long term performance results will be interesting.
However, long term performance results will be interesting.
10-21-2015, 09:48 AM
#661
SPOOLN8
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Pre-mix as well?
I also have the OMP in stock configuration, no sohn (I'm assuming you bumped up the flow on mine as well) and I premix every tank. Although I'm nowhere near pushing the limits with the MSP I have been running a stock Greddy for 5 years and the engine starts and runs in all conditions as good as ever.
10-21-2015, 03:18 PM
#662
Pre-mix as well?
I also have the OMP in stock configuration, no sohn (I'm assuming you bumped up the flow on mine as well) and I premix every tank. Although I'm nowhere near pushing the limits with the MSP I have been running a stock Greddy for 5 years and the engine starts and runs in all conditions as good as ever.
I also have the OMP in stock configuration, no sohn (I'm assuming you bumped up the flow on mine as well) and I premix every tank. Although I'm nowhere near pushing the limits with the MSP I have been running a stock Greddy for 5 years and the engine starts and runs in all conditions as good as ever.
10-21-2015, 03:47 PM
#664
Driving my unreliable rx8
I'm running atkins solid corner seals. I can't say much but I haven't had a problem yet. I'm kind of glad I did after hearing yours broke. But did you have to mill them for deeper apex seals?
10-21-2015, 03:56 PM
#665
There is nothing wrong with the stock rx8 corner seal design as it has a solid plug which prevents it from breaking when it gets squeezed by a rotor deforming detonation .
When you mill the rotors for rx7 apexs you need to also fit rx7 corner seals . It is a common thing to fit solid corner seals in the rx7 world due to the fact that the stock corner seals have a tendency to break as they only have a rubber core. My engine builder didn't seem to think it was going to be a problem on a Renesis ........ wrong .
Further to this , I hope you haven't got the Aitkens corner seals with the recess machined into them .............. they are known to cause premature wear on the irons.
Last edited by Brettus; 10-21-2015 at 03:58 PM.
10-21-2015, 04:16 PM
#666
Driving my unreliable rx8
Well that sucks, I figured the corner seal placement in the rotors was a little different and did not know the 7 corner seals would fit. I do have the recessed solid corner seals. That's a bit disappointing, but it happened before I got deep into the build. Oh well I don't put down enough miles to really be worried.
10-21-2015, 04:19 PM
#667
Well that sucks, I figured the corner seal placement in the rotors was a little different and did not know the 7 corner seals would fit. I do have the recessed solid corner seals. That's a bit disappointing, but it happened before I got deep into the build. Oh well I don't put down enough miles to really be worried.
10-21-2015, 06:09 PM
#669
SPOOLN8
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I typically don't pre-mix if i know I will be burning the majority of my tank on a highway trip.
10-21-2015, 07:35 PM
#670
hmmm, how come you don't Pre-mix anymore? Have you talked about it in another thread somewhere? Obviously you aren't seeing any negative effects of no pre-mix but I'm just curious.
I typically don't pre-mix if i know I will be burning the majority of my tank on a highway trip.
I typically don't pre-mix if i know I will be burning the majority of my tank on a highway trip.
From that I reasoned that the premix i was doing (at 200:1 ) was largely ineffective. So I decided the best course of action would be to either up the premix ratio to 100:1 ish or just do away with it altogether and up the OMP .
I decided to try the later ........... i think it was the better choice !
Last edited by Brettus; 10-21-2015 at 07:38 PM.
10-22-2015, 02:13 PM
#673
In hindsight ............... I think I should have done the rebuild first as I think it could have made a big difference to the spoolup issue that sent me looking every which way for a solution.
Last edited by Brettus; 10-22-2015 at 02:58 PM.