0-TO-100_Real_Quick

I bought the BHR flywheel second hand, and it's been about a year now with it on. I changed the clutch out with the "stock" Exedy stage 1 so clutch resistance feels the same to me. You just have to slip it on the engagement point and it'll be a smooth ride. I will say the steeper the incline you stop on, the more you'll have to slip it to get it going. I'm NA, and it does yield some noticeable acceleration difference, especially in 2nd gear. With a turbo, I suppose it might indirectly help build spool faster in relation to time.

jcbrx8

I agree ... and have already conceded as much: I'd much prefer to *design forward* w/ the aid of a comp. map. However, in this case ...as is sometimes advantageous in life ...we make decisions and proceed with less than ideal information. The inability to precisely predict an outcome ...doesn't guarantee a bad one. Often other factors in play.

For the life of me I don't understand why Precision doesn't distribute maps , and while a poor marketing decision...it doesn't negate that their product c/b a good "value". I have had no issue w/my 6266, and am well aware that others Mfgs provide more bells & whistles ...for a premium.

Negative.

jcbrx8

"0 to 100", Appreciate your response, but yeah as Team suggestions ...I'm thinking any add'l acceleration will likely be imperceptible w/ a turbo.

Brettus

iTrader: (2)

I used to run a lightweight flywheel on my old Greddy setup. What I noticed was I would spin the tyres in 2nd gear .............a lot. At the time I thought it was the LWFW but later realised it was just that back then I ran cheap tyres. So .............just another argument for gaining hard data for any mod. that's done vs the ole butt dyno.

jcbrx8

. Truth.

TeamRX8

iTrader: (25)

OE is ~16.8 lbs (per Racing Beat) but that includes an integral CW. The auto-trans CW that an aftermarket flywheel requires is 3.6 lbs.

So all you’ll get for mass reduction is 13.2 lbs - X.X lbs of the aftermarket flywheel. It’s just not that much mass compared to OE flywheels that weigh 30+ lbs. The OE flywheel is lighter than some FC/FD RX7 aftermarket flywheels w/CW even. The lightest standard clutch RX8 flywheel that I’m aware of is the Racing Beat aluminum at 8 lbs. So you’ll only drop around 5 lbs and that’s practically nothing against turbo output not likely to rev much to or past 8000 rpm.

jcbrx8

EDIT: Well, still coming up to speed on interpreting compressor maps... so l'll keep this simple. Some trends appear evident when comparing the below three compressor maps:

- TD05H 18G: ~ 3000 full spool / 120k compressor speed / potential ~ 300 wHP
- GTX3582 / PT6266 comparable: full spool ~ 4200-4300 rpm / ~90k compressor speed, potential ~500+ wHP
- GTX3576 / PT5862 comparable: estimated spool ~ 3700 rpm / ~105k compressor speed, potential ~400+ wHP
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we shall see...

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TeamRX8

iTrader: (25)

not sure whether to 😢 or …

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jcbrx8

Lol, interesting ...just trying to learn and share as I go/grow, and to that point ...have learned a good deal studying the maps ...regardless how accurate the projection.

So, do you think this not worth the exercise given the use of "comparable" maps..., or that incorrect assessments h/b made?

TeamRX8

iTrader: (25)

both, would prefer to see someone choose a more certain outcome over compounding assumption upon assumption:








but what God closes, no man can open … 🤨

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jcbrx8

Well, I definitely agree the G25-660 and G30-660 turbos are better, i.e. near perfect in all respects, for the Renesis, and what I w/h chosen had I wanted to spend the add'l $$.

We shall see how the PT5862 performs.

jcbrx8

Have been busy..., but managed to make some progress...
- Exhaust manifold prep'd and installed.
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jcbrx8

Well, it's been stop & go. Had an ornery oil injector snap on insertion. Got it installed after ~a week delay awaiting delivery of it's replacement.

Started to install the oil injector vacuum manifold, and ...one of the small nipples snapped. Evil. Simply evil.

Gotta love it... the joys of working on a car more than a decade and a half old. But she's still so much fun.

So, ... new little vacuum manifold on order. More patience. More golf....

EDIT: Much preferred this vacuum manifold break now ...than to have had a nipple break unknowingly ...buried under the UIM ...during normal operation.


Ornery oil injector
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New oil injector received and all injectors installed.
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Evil oil injector vacuum manifold
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jcbrx8

Progress slow w/ current work load..., but steady. Installed:

- Oil injector vacuum manifold & hose assembly
- Primary, secondary & auxiliary fuel injectors
- Main harness
- LIM


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jcbrx8

Update:

- First trial fit & course clocking of the new turbo.
- oil filler & reservoir
- UIM (lower section)
- alternator
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jcbrx8

Update:

Made good progress on the reinstall today:
- installed the turbo oil feed & drain
- Finished turbo clocking and mounting for reinstall
- Installed oil filter pedestal and cooler line
- installed engine in bay (rarely easy ...smh)

Next up:
- dressing the engine bay
- reinstalling the down pipe & WG
- noodling ideas to transition from my 8" back to my 12" IC, ... mounting it high enough to allow adequate ambient airflow underneath to the rad, w/out completely frankensteining my crash bar.


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jcbrx8

I've run a few different IC configurations hoping to find an optimial balance between IAT and ECT performance.
- 1st config: 12", FMIC config (w/ 13 cooling rows open to ambient flow)
- 2nd config: 12", reverse v-mount config w/ splitter (w/ 17 cooling rows open to ambient flow, but laid flat)
- 3rd config: 8, FMIC config ( w/ 12 cooling rows open to ambient flow)

New / current config: 12", FMIC config (w/ 17 cooling rows open to ambient flow).

The IC w/b mounted as high as possible to allow as much air flow underneath the IC directly to the rad as possible. I anticipate good IATs, but ECTs w/ this config are TBD.

Intercooler config evolution:
1st config.

12" (w/ 13 cooling rows open to ambient flow)
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2nd config

12" (w/ 17 cooling rows horizontal to ambient flow, in reverse v-mount config w/ splitter)
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3rd config.
8" ( w/ 12 cooling rows open to ambient flow)
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New / Current config.

12" IC, (w/ 17 cooling rows directly open to ambient flow.)
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Brettus

iTrader: (2)

Nice work showing all those Curtis. Care to show some numbers and comments about success or otherwise of each iteration?
I've gone through a similar learning curve leading to my latest setup.

jcbrx8

Sure thing. I'll pull together some data & observations on each.

jcbrx8

Progress update:
Continued steady progress, but discovered an issue as well.

Installed:
- Down pipe
- WG (w/ 1.5# initial break-in spring)
- AC Compressor
- Plugs, Ignition coils & harness
- Successfully pressure tested the fuel injectors and rails

However, when inspecting couplers I discovered an issue I need to resolve with my passenger motor mount bracket. This is not "new" ... I just didn't deal with it, , , when first discovered back in 2018.

Edit: The bracket is at the machine shop. The horizontal is being lowered 0.5" on the vertical to create clearance for the comp. inlet coupler. I'll shim the driver side motor mount an equal amount to keep things leveled off, if req'd.
v
v
Current Status of bay...

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Passenger Motor Mount bracket issue: does not provide enough clearance for comp. inlet coupler.

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Pic w/ pinched coupler from 2018 when first noticed

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...resultant coupler today.

TeamRX8

iTrader: (25)

Like I keep posting; the solution is to get rid of it, but I’ll save it for another day.
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jcbrx8

"it" ???

TeamRX8

iTrader: (25)

the factory engine mount and bracket.
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jcbrx8

OEM mount, w/ custom RX8P bracket on the passenger side, which s/b fine after a minor clearance adjustment. Complete OEM on driver side.

TeamRX8

iTrader: (25)

I can assure you that it’s not me who isn’t seeing it for what it is, but saved for another day.

All I mean by that is it’s still based on the OE type design and I’m well familiar with what you have. It likely won’t click until observed with a fleshly eye …
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