derek196

Hello everyone, i figured its about time to outline my build for u guys.I bought the car with autocross in mind and set it up fully for stx. I since bought a brz to daily and autocross and decided to make the rx8 a track focused car. So the goal of my build now is a barley street able hpde/open track day car. I set a goal of about 350whp reliably so i pulled the engine and brought to Adam at rx7specialtys, we talked it over and decided on his rx7 race apex seals, intake and exhaust porting, with new housings. i ran the car n/a for 1000km and the oil seals failed for some reason??? Adam was good and compression checked for free and ended up rebuilt it on warranty. I decided and ordered turblown's efr 8374 kit despite poor rep on this site. Needless to say i see the reason for poor rep it took 6 months, wrong air filter set up was sent and the aluminum welds were not to great, had to get coolant flange re-welded. Other wise i like the design of the kit and the manifold and downpipe were real nice and he did offer some free tuning to make up for the mistakes.

Starting off thread right with a dyno run

TeamRX8

iTrader: (25)

This is the Renesis engine? Not too bad to start ... what ecu is this on?

derek196

Yes built renesis with rotors cut for rx7 apex seals. Will list parts here and get some pics up soon.

The engine
13b msp ported intake and exhaust, 13b race apex seals
Turblown efr 8374
Oil regulator mods
Holly ign a1 coils, msd wires, r6725 plugs
Turbo xs 3 inch catless midpipe and catback
Adaptronic pnp with fuel pressure and flex fuel
Bhr underdrive pullys
Bhr flywheel, act stage 3 clutch
Rx8performance radiator
Rx8performance engine mounts
Superpro diff bushings
Omp delete
Apv deleted and left closed

The chassis

Ohlins dfv swift springs 7k rear 11k front
All busing repalced with poly
Rb sway bars
Goodwin racing endlinks
17"rpf1 2554017 nt01
Racing brake 2 peice rotors xt960 pads

furansu

That is a big boy turbo and despite the Renesis exhaust ports it seems to spool nicely. There should be another 100whp easily in the turbocharger, though I don't know how well those ports will cope -- though the current power level and delivery is perfect in my eyes for the chassis and I bet a riot to drive.

Did you do any testing with the APV in play prior to deleting them? Were the inserts just left installed in the closed position or were the ports sealed another way?

derek196

Apvs are still there and can be turned manually as theres no room for the motor with the top mount setup. I did some breif testing and lost 15%ve tapering down all the way to 7000 rpm where i was still loosing 6%ve which is where i gave up and closed them again. I attibute this to the intake porting maybe if apvs were not ported awell it might make 7k to 8k better but not worth the 1000rpm or so spool loss im my opinion.

TeamRX8

iTrader: (25)

Yeah, there’s no way that simply having the APV open is not going to negatively impact low end response. Plenty of people routed around the APV motor though. Having it closed is the next best option I suppose. You might as well block it off entirely in that situation.

derek196

I think u would have to comprimise on the manifold or downpipe too much to keep the apv motor i agree with turblowns assement there and with the remaining ports bigger i think it ends up working out well.
I agree blocking them off at the upper manifold would be ideal should lower the overall intake volume not sure if would be a noticeable gain tho. May give it a shot when i have time

jcbrx8

Derek - Congrats! Solid build w/ lots of goodies and excellent "result", HP & torque curves. If you're so inclined...w/b interesting to see more of the "process":
- build progress pics
- issues encountered & resolutions
- finished kit pics
- etc.

Congrats again. I'm sure she's a blast!

Brettus

iTrader: (2)

Excellent first up result Derek196 . Been waiting for some solid results with that turbo for a long time. I wouldn't go for much over that as we have proven the renesis wont take much over 400 . Looks like it could benefit from more stable boost profile up top though , presume it's the 0.92 turbine .....is it running the stock efr internal WG ?

derek196

Thanks! It is definatly a blast i will get a write up of the build up soon gotta go through all my pics.

Heres a recent engine bay pic for now

derek196

Im not likely going any higher soon, its the .092 turbine with low boost efr iwg. Note that the psi in the dyno is off. Logs reveal 13.9 peak, high 12s at max torque and low 12s with minor ossilations to rev limit. They said the sensor has been innacurate latley. Also boost comes on much sooner on the road i have made 16 psi by accident in 4th at 4250

jcbrx8

Whew... that engine bay is tight as a drum! Don't snap a belt.

RotaryMachineRx

iTrader: (1)

Looking good! Excited to see some more updates.

Rkesh88

Amazing numbers. Nice to see someone else with a turblown kit out there. Kinda sweating I’m still waiting on my manifold from them.

furansu

Coolies -- I look forward to the thread. I'm particularly interested in the manifold fitment and heat concerns with the turbo placement. This chassis does make turbocharging a small challenge due to the narrow frame rails compared to an FD.

RotaryMachineRx

iTrader: (1)

Derek, where are you located? We must be pretty close, would be cool if I could see the setup before we get snow! (Or second snow if you are in Southern Alberta!) I'm in Sherwood Park.

derek196

Im in calagry should be at track junkies on the 5th if the weather holds out though

Rx8_sport

Hey derek.

I ordered the same kit you have and wondering how bad the intake temps are you experiencing tracking up at castrol since your intake is inside the engine bay?

odd that he has the piping coming from the intake hole on the frame vs coming from up and around the fuse box like advertised..

derek196

intake temps are fine mostly due to intercooler never more than a 10 degree delta. I would defintatly vent hood and try and duct some fresh air to area. The inlet pipe design was new for my kit and provides a much straiter and shorter path

Rx8_sport

ok great to hear.

The kit was ordered and he said it would take 10 weeks from last week, so 9 weeks now.

i got the 8374 upgrade w/ the t4 twin scroll 0.92 turbine housing that's had the center divide cut out as per his kit. He mentioned boost creep happens if you're around 7psi base pressure to around 9 or 10 with the choked waste-gate port. wondering what you're experience was with this?

also wondering if you played around with the APV valves anymore and what you're final solution was? Some guys have said to keep them open for more top end power while sacrificing low end power, but by how much is the question

derek196

The boost creep they mension happens on the regular 13b but we have less energy do deal with is why i belive the 8374 iwg works just fine. My final soulution is to remove apv valve completly and block off upper manifold. Some small gains around 7k rpm may be had opening them on stock intake ports but not fully ported it seems. Elliot at Turbosource says he also always leaves them closed but has not played too much with it.

derek196

So update and looking for opinions, engine blew detonations on rear rotor at 10.8 psi 11 afr 14 degrees timing on a 102 octane boostane mix. While thats likley down to bad fuel, the irons are suffering from bad heat depression around all the exhaust ports. Builder has said another customer suffered same failure on same turbo. He suggested turbine ar of .92 is too small for the renesis.

derek196

Some carnage pics!

Brettus

iTrader: (2)

Damn ...that sucks . Sorry to see all that damage .
The detonation ...your fuel mix probably isn't the octane you think it is and it's not doing the job ..... how hot was the day ...do you measure IATs ?
The wear .... almost certainly a lubrication issue . What was your lube regime ? Premix % and type ?

derek196

Thanks for the condolences brettus, I knew i was riding the edge of pump gas especially considering it was 34c out on an uphill 2-3 shift. Manifold temps were 38c.

I premix only no omp. 100 to 1 or better with indemitsu rotary premix on pump gas and redline alchohol premix on e40. Figured that should be plenty?