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while it serves the purpose at the moment, that small piece of hose to the oil pan connection at the bottom seems like a weak point/issue waiting to happen.
you might consider replacing that with a tube-tube connectors/adapters along with some hard tube if needed as a longer term solution.
if that breaks or comes loose the oil pan would drain quickly
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while it serves the purpose at the moment, that small piece of hose to the oil pan connection at the bottom seems like a weak point/issue waiting to happen.
you might consider replacing that with a tube-tube connectors/adapters along with some hard tube if needed as a longer term solution.
if that breaks or comes loose the oil pan would drain quickly
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So I noticed the RX8Performance kit uses a PT6266 turbo. However, they don't specify whether it's the Gen1 or Gen2 model. Do you know which one is you currently have installed in your 8 by any chance?
Hindsight being 20/20, and being close to taking this plunge myself, I wonder if I could pick your brain a bit?
I've read through the entire thread but admittedly did not take notes. Your goals are the same as mine, roughly 300-350whp with reliability and street manners trumping any raw power aspirations. You also set out to modify as little as possible on your rx8performance kit. I believe you did the following:
-Modified exhaust manifold to allow more ideal "clocking" of turbo
- Had numerous bungs welded into various pipes to facilitate your EBC and monitoring systems
-Replaced the provided intercooler with a smaller size and modified the mounting brackets to allow more airflow to your radiator. You ended up finding a faulty thermostat which seemed to be the cause of most of the issues. Would you still advise the smaller intercooler mounted higher up in retrospect?
- Modified the connection between the TB and charge piping with a straight pipe for better sealing
- Ground weld "tabs" off most piping and beaded to get proper sealing
- Modified the oil pan provided with the kit with a new bung to solve clearance issues causing a leak
I apologize for any mixed up terminology but I believe that covers most of the changes you found necessary. If you were embarking on this journey today would you still use this kit as a base or possibly go the custom route?
I'm also curious about the turbo sizing. There's been a fair bit of back and forth but I believe there is a concensus that this turbo does sacrifice a bit in the spool up department to provide more total power gains, which are beyond the scope of my goals. If building a kit from scratch would you sacrifice some of that potential for a quicker spooling system?
I sent Scott an email maybe 6 - 8 months ago asking (for someone else) about using a Precision 6062 Gen2; which you can get with a 1.05 A/R SS V-band, but never heard back. To be fair, he and I aren’t on best terms so can’t really hold that against him and covid was all the rage then too. However, timely delivery and QC have always been sore spots for some customers and the covid stuff seems to exacerbated the situation. Just make sure you do your diligence and understand that things might not be perfect or timely if you go that route. Not at all trying to imply for you not to do it. That’s between you and him.
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I sent Scott an email maybe 6 - 8 months ago asking (for someone else) about using a Precision 6062 Gen2; which you can get with a 1.05 A/R SS V-band, but never heard back. To be fair, he and I aren’t on best terms so can’t really hold that against him and covid was all the rage then too. However, timely delivery and QC have always been sore spots for some customers and the covid stuff seems to exacerbated the situation. Just make sure you do your diligence and understand that things might not be perfect or timely if you go that route. Not at all trying to imply for you not to do it. That’s between you and him.
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I appreciate the input and I've read about inconsistencies that gave me pause, along with the modifications necessary in this thread. That being said, we all know I have very few options that are even remotely off the shelf and I haven't developed any relationships with local welders... yet. Lol
I imagine a custom setup would have run more than this kit, but I imagine that gap has closed somewhat with the various issues they have run into and modifications made. If it's relatively negligible I'd prefer to go the custom route and use the knowledge gained in the last 4 years to optimize as much as I can.
I'm obviously not smart with my cash though, I'm going to boost a Renesis.
...If you were embarking on this journey today would you still use this kit as a base or possibly go the custom route?
I'm also curious about the turbo sizing. There's been a fair bit of back and forth but I believe there is a concensus that this turbo does sacrifice a bit in the spool up department to provide more total power gains, which are beyond the scope of my goals. If building a kit from scratch would you sacrifice some of that potential for a quicker spooling system?
Jerpa, Glad you found my build thread helpful. Yes, you're correct about my initial objectives, and modifications which I found helpful in optimizing my system.
Couple quick clarifications:
1. At my request Scott welded on the extra bungs prior to shipping the kit.
2. IMV the large IC is too large for the limited space to provide sufficient air flow to the rad. to maintain acceptable ECTs under spirited driving, except perhaps for those in cool climates, w/effective ducting, or in a reverse v-mount config, which I did run for a while...but ultimately changed to front mount which I prefer. I found this... to be true aside from the bad thermostat issue, which did arise at a point in time, and complicated things.
So, to your question: would I purchase the RX8Perf or go the "custom" kit route?
That's really an individual decision based on one's time, talent, tools, skills, finances, etc.
IMV the RX8Perf kit is well designed...from a flow perspective..., well fabricated, and a solid kit ...w/a few issues that needed sorting. But then ...there's an entire thread on Greddy "fixes". Sooo... . I had no interest in fabricating a kit myself, (I have a family, active life, and that's not what I do), or offering my car ...for who knows how long ...to have someone fabricate a kit from scratch. Nor did I have interest in cobbling together a questionable used Greddy...potentially requiring multiple "fixes". So, my intention was to begin with a "new" complete base kit. Once received...while admittedly not perfect, I've been satisfied, i.e. this kit allowed me to meet my objectives.
Finally, there is a third option: "do nothing "at all, which is what I chose for many years until I perceived that better hardware AND tuning options had emerged. I'm glad I pulled the trigger ...as it's worked out for me. However, as I've stated elsewhere ...the extraordinary delays experienced waiting to receive the *entire* kit were ...off putting to say the least. IMV this is the best complete kit on the market, or at least was at the time - I've not checked lately. I hope fabrication timelines and communication have improved, but am not sure that's "knowable". ??? I would only purchase, given my experience..., via a different process, e.g. an initial down payment, followed by incremental payments commensurate w/ progress, etc.; w/out which I may choose to "do nothing" or build a different platform altogether.
Agreed IMV the 6266 is a bit large for DD objectives / goals. It does sacrifice spool-up responsiveness every acceleration for great top end power which is only used from time to time in a primarily DD application. I am considering whether it's worth swapping in a 5862 , which I believe w/b ideal, when a refresh is necessary.
Well, it's that time ...for a refresh. So, work is underway to complete the following:
- installing a new reman engine (delivered)
- stripped bay & pulled old engine
- undressed old engine to core
- checking & cleaning APVs and SSV
- swapped hardening bits to new engine (enhanced oil regulator & Turblown stud kit)
- transitioning to a new turbo Precision 5862
*NOTE: I'll likely have some items FS when refresh is complete:
Precision 6266 BB E CC, .82AR v-band inlet / outlet
12" IC
A few pics:
. New reman.
. Old engine ...pulled
. stripping...
. checking & cleaning APVs
. Checking the SSV
. clean SSV reservoir
. Old core -1
. Old core -2
. New core -1
. New core -2
. New core w/ OEM bolts
. New core w/ Turblown stud kit installed
given they don’t provide maps to reference, the 58 compressor wheel over the 60 would make me a bit nervous.
Yes, my 6266 was fully spooled at ~ 4200 rpm under WOT, and provided more than enough top end, 415+ wHP. Since I was undertaking the refresh I thought it an opportune time to optimize the turbo to my DD objectives: fully spooled ~3700 rpm w/ sufficient boost to support ~ 360-375 wHP.
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Team, Agreed, I'd have preferred to have used compressor maps to base design, but using my known 6266 performance as a base, ...and having visited w/ Precision tech assist ..., and w/ Brett leveraging his wealth of turbo knowledge / experience; I'm fairly confident that the 5862 will be a good fit for my objectives.
I should know w/ in a few days or weeks ...just depending on my schedule to get the work done. Looking forward to a tight engine and responsive set-up.
yeah, but where is that occurring because without a map you have no idea
i.e. if that point occurs at 3.5 - 4 Pr on the far upper RH corner of the map with a small displacement piston engine that likely means a much lower peak hp at 2.3 Pr on a 13B 2-R at the far right lower edge of the map. The other question is the efficiency there.
If it’s low then the power level will basically stall. However, if the efficiency is sufficient the turbo will continue to charge right on past it’s rotational speed limit and either wear out quickly or fail (assuming you don’t have a turbo speed sensor or control strategy in place). That’s where all the new technology is heading.
those assumptions will get you if you’re not careful …
actually the Gen2 5862 is rated 700 and 6062 Gen2 is rated 750. Are you intending to use one of the older turbos instead?
To put things into perspective .... The EFR7670 (same compressor size as 5862) will make over 400whp no problem on a 13b, as has been demonstrated on numerous occasions on the rx7 site. That has best efficiency in the 3.5-4.0 Pr range, which is pretty much the worst case scenario as you pointed out Team.
Sure It would be nice to have maps but IMO the 5862 will work just fine for Curtis's stated goals.
never said it wouldn’t, it’s just the reasoning for the words that I did post so he’d understand my thought process
so we don’t have maps, but if we can find other examples then those can be studied for reference with hopefully enough information to grasp the variances and their impact.
most of the references found on RX7Club were for wanting quick boost, but below 400 whp (350ish)
Did find one REW w/dyno graph (below) that made 415 whp 312 ft-lbs on pump gas @ 14 psig, but it was fully BP’d.
With water/meth added the same REW BP engine with same 5862 made 513 whp 385 ft-lbs at 22 psi. The turbine housing was an 0.84 A/R divided T4. Again, with full bridge porting and is likely to add some variance wrt the flow vs. boost requirement.
This is from 2015, so likely not the latest 5862 version either, which is still not fully defined yet here. The result imo tends to suggest low efficiency.
Team - I went w/ the Gen 1 PT5862 w/ a CCE comp cover b/c it has a 3" inlet same as my previous 6266. The Gen 2 PT5862 ONLY comes w/ the CCS comp cover which has a 4" inlet, and I wasn't going to try to shoehorn a 4" inlet into that limited space.
And ...again, agreed ...I would prefer a comp map, but am optimistic about the 5862's performance based on what is known.
During an earlier conversation Brett recommended that I review the GTX5876 compressor map as comparable to the PT5862. They have very comparable compressor: turbine wheels:
PT5862: (58/76 : 71/62) GTX3576: (58/76 : 68/62)
...and the GTX3576 generated the following at 10 and 18 psi on a street ported FC:
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On another topic I'd like to garner some feedback for any who'd like to chime in.
I'm still running the OEM flywheel. While I'm doing this work I'm considering and reading up on lighter weight fly wheels. I've read to expect:
- slightly twitchier starts from a stop,
- faster 1st, 2nd, & ...perhaps 3rd gear spin up,
- but a quicker loss of rpms d/t less spinning inertial mass on gear shifts.
For those w/ experience &/or running lighter flywheels ...what are your opinions / thoughts pro or con for running a lighter fly-wheel in ... albeit a spirited ..., but somewhat DD (I work from home)?
Will you be changing the clutch as well? My thoughts are that the clutch will have more affect on driveability than any lightweight flywheel will; but I'm not saying that with a whole lot of experience. My twin disc Exedy took some getting used to but I'd say driveability was still very simialr to stock. The clutch grabs more and has a slightly different engagement point compared to stock, but IMO that only affected me during stop and go situations, shifting on the fly had no noticeable change in my situation.
I also didn't put many km's on this new clutch/flywheel setup before parking the car and learning I had a blown motor this entire time....... I've been saying this for far too long, but should be back on the road soon....
Last edited by RotaryMachineRx; 06-01-2021 at 11:52 AM.
with a street turbo application my advice would be to not really bother with a flywheel change. If you were racing or trying to get everything you can out if a high rpm NA engine that would be different. It just needs a suitable clutch for the projected torque output.
I won’t fuss over it any more than I already did, but disagree that you can just size up different wheel sizes to compare one manufacturers turbo to the map of another. Then trying to use those efficiency points to me suggests a lack of understanding.
Just out of curiosity, did you give any consideration to hacking off the Precision v-band & replace it to use a Garrett G-series turbo instead?
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Will you be changing the clutch as well? My thoughts are that the clutch will have more affect on driveability than any lightweight flywheel will; ...
Originally Posted by TeamRX8
with a street turbo application my advice would be to not really bother with a flywheel change. If you were racing or trying to get everything you can out if a high rpm NA engine that would be different. It just needs a suitable clutch for the projected torque output....
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Jesse - Hadn't considered changing the clutch as well. Was really just considering doing the flywheel ...since everything's apart and as a potentially simple enhancement. However, Team - precisely to your point..., was wondering if it's even worth the $ and effort on a turbo application. Will likely forego it.
10-14-2020, 11:30 AM
. I had no interest in fabricating a kit myself, (I have a family, active life, and that's not what I do), or offering my car ...for who knows how long ...to have someone fabricate a kit from scratch. Nor did I have interest in cobbling together a questionable used Greddy...potentially requiring multiple "fixes". So, my intention was to begin with a "new" complete base kit. Once received...while admittedly not perfect, I've been satisfied, i.e. this kit allowed me to meet my objectives. 
, which I believe w/b ideal, when a refresh is necessary.
