Mazda RX8 Renesis Horsepower & Performance, Intake Manifold port & polish - Kyle Mohan Racing

[@rotaholikzhds906]

Thats out off it cause we learnt having a ruffer surface actually caused better airflow with having the air been stirred up to cause better flow for mixture with the fuel and air can understand getting rid off sharper edges but getting rid off the ruff intake surface would compromise over benefits.this is just what we have found with doing rotary engines and intake manifolds.but still interesting to see what you guys have found we might find another manifold and throw our standard rx8 on a dyno and switch manifolds to see the differences also.

[@KyleMohanRacing]

To ruff is no good and Mazda castings are that. To ruff and undersized in some areas. We make sure to leave a proper surface finish to atomize fuel and optimize air flow.

[@Dollsofgod]

Edit: When I did this the LIM was off the engine and stripped down to the bare cast aluminum piece. Please don't put weird stuff through your engine. A trick I learned to get rid of the carbon is to use oven cleaner down the runners. Word of warning I've heard it "eats" metal, I didn't notice damage the substance would have caused after looking at the machined sealing surface of the flange, seemed like the finish was the same. I was happy to have clean runners without scrubbing for 2 hours. Always try using the properly designed chemicals for your goal though and be prepared for a bad outcome if you don't.

[@KyleMohanRacing]

Better to use automotive products. Some cleaning products can damage bearings and housings. I do know people use it though. 👍

[@Dollsofgod]

@@KyleMohanRacing Couldn't agree more. I should have noted that the manifold was off the engine and stripped down to the bare cast piece. I'll edit that not before someone tries spraying oven cleaner down their LIM while it's still on the engine.

[@PetesWorkshop]

Hey. Can you please make a video to show how the tuned length manifold works and also the relationship between the primary and secondary injectors. Thanks.

[@Johnwalter1044]

One day, i will get another RX8 and i will use your videos to improve the engine performance and reliability! Thank you!

[@KyleMohanRacing]

👍

[@chrisjoy4435]

@@KyleMohanRacing Have you done any experimentation with ditching the stock intake setup such as ITB’s?

[@AntonioGarcia-ry8kv]

Great video if you can definitely do some more on the rx8 specifically that would be great keep the vids rolling

[@ifoundnate]

Thank you for being a genuine person! Such great information and very informative 🙏🏽❤️

[@tsantiagoo813]

Thanks for the rotary building tips. Im going to remove the rough casting off the actuators this weekend because I found a vac leak from a bad gasket I need to replace.

[@mikeposada5145]

What about ceramic coating the inner ports or copper coating the inners... they would be super smooth and have a say in heat decrease

[@felixwankel3989]

Fuck the law, a good running car aint a crime.

[@raywaltdecuba5699]

Sooo crazy plan here, ditch the renisis intake and go custom rx7 2x ITB drive by wire setup for max N/A power or would i get the same HP results with the stock manifold as is with SSV and VDI ?

[@efaracing4000]

This video must of came out the same time i was inspecting my manifold😂 another good one mr kmr 👍

[@SoldfMC]

My manifold just happens to be off also.

[@KyleMohanRacing]

👍

[@jasonskinner1652]

Thank you Kyle. Good advice, and not that hard to do once it's all apart. 👍

[@KyleMohanRacing]

Yep totally agree

[@ryanworkman5229]

What is the top plastic section like for casting burrs? I imagine it will be much smoother being plastic, but is there room for improvement there as well?

[@ask3xd903]

My old ass keeps watching rotary videos but still need the damn car lol

[@canyouhearmatt5529]

I've had 5 of them in the past year. Get em now while they are available and cheap

[@novalover1223334444]

@@canyouhearmatt5529 same I’m on my 3rd one now all of them purchased under 1300$

[@canyouhearmatt5529]

@@novalover1223334444 so this series 2 one I just got the owner thought the rotary went out but it was just the coils and I swear the engine looks like it's been rebuilt because the car is at 110,000 miles. Runs and drives great, no hot start issues, nothin..paid $1200. I'm currently looking into putting a rebuild kit away for that rainy day that hopefully never comes.

[@Carboniotecable]

Hi, congratulats for the video, very interesting. In a few months I'll have to rebuild my engine and I'll probably clean (with street porting) the intake doors. Is it worth doing the work on the intake manifold, even if the car will be for road use? Thanks.

[@chubbylove16]

Really grateful for the info would like to know how to setup the rx8 stock intake for boost on hybrid please

[@bennyb.1742]

Old Video, but would you keep or ditch the actuators on a hybrid turbo setup? I'm hypothesizing a Chips flange to FD upper could be a thing.

[@KyleMohanRacing]

We ditched them

[@GotMilkRS13]

Can you categorize your videos in playlists? For example an „improving your Renesis playlist, so it’s easier to find videos to that topic on your channel. Otherwise top video

[@KyleMohanRacing]

I will try👍

[@GotMilkRS13]

@@KyleMohanRacing I see you immediately worked on it. Appreciate it a lot

[@davidbaker8251]

How would one go about polishing the intake

[@elgringojosh825]

I thought golf ball dimples were better than smoth surfaces?

[@KyleMohanRacing]

@elgringojosh825 yep. how much have you got to spend? So far, no one has done it yet on an RX8, probably for the financial aspect.

[@APitStopGarage]

1 To 2 HP 😂😂😂 Damn that’s a lot 😂 I laughed so much when you said this part 😂

[@colinbowman8816]

Yeah, I want to love rotaries....but oof it's not easy. How about a nice Skyactiv G? 2.3 DISI?

[@05stiguy]

Besides the intake and factory cat is there anywhere else to squeeze n/a power out of an rx8? Have you heard of any street driven rx8s hitting 300-350whp on a properly built n/a 2 rotor?

[@Statikk]

absolutely impossible. when looking at an rx8 we have to realize that this car was fully decked out from the factory as far as it could go legally. only corners cut were due to emissions laws. with a factory rx8 running around 180-200 whp, the max you would get would probably be 230 maybe 250 whp. and that’s with all the marbles, full straight through exhaust, ideal intake, and a really really good tune. so unless you want to go for more aggressive options like bridgeporting, street porting, or p-porting, 250 is the limit in terms of whp. Now if you go P-port, you’re looking at closer to 310 n/a, but that requires rebuilding the engine. TLDR: Bolt on NA max power? 250 WHP Ported NA Max power? 300-320WHP

[@bobjames1521]

​@@StatikkI'd even say that you're overestimating. With a perfect tune, intake, exhaust and streetport you can hope for about 250bhp (not to the wheels). Remember that mazda overrepresented the numbers from factory so a stock 6 port rx8 only makes about 200bhp. Also bridgeport etc tend to make less than streetports.

[@АртурАгафонов-ш3ц]

@@bobjames1521 No, exhaust + porting + tuning ECU (i mean stock ECU) = 278 hp And this made in Russia. The maximum possible achievable power on gasoline will be in the region of 310-330 hp, but it will be necessary to completely rework the intake and exhaust system, as well as make aggressive porting, change the ignition system, reconfigure the ECU, etc. (not to the wheels) But it will not be cheap, it's like creating a new engine from scratch. And of course, the question is what will be happens on the power / torque graph, because just peak power does not mean that this engine is good.

[@Katsaguro]

Have yall thought about ordering the mx-30's "backup generator" and creating a skyactiv 16x rotary out of it yet?

[@mflbikes1870]

The geometry is different

[@stephanekerouack6171]

Porting is a way get efficiency with a bonus of few hp

[@chrisjoy4435]

Kyle Have you experimented with ITB’s on the renesis?

[@KyleMohanRacing]

No but I hope to in the near future

[@ne0tas]

There is someone who added the AUX ports with its own ITB's and gained like 10whp from it alone. the stock manifold and the headers restrict the renesis so much. esp the LIM.

[@jrock3262]

On my 05 rx8, my intake manifold control runner bank 1 is stuck open. Is that an easy fix or should i just buy a new control runner?

[@KyleMohanRacing]

I always say try to clean it out first. Just be careful and take your time.

[@LightGesture]

Well i have something to do for my baby... parts car, here i come back to us again.

[@kaizousha5531]

What fuel rails did you use on the renisis intake. I haven't found any good ones until i came across the expensive Elite Rotary shop billet rails... Guess what!? They don't work! They were poorly designed and you can't even clip on the injectors. Did you make custom rails?

[@KyleMohanRacing]

We just modified the oem and they work fine.

[@kaizousha5531]

@@KyleMohanRacing so just like use the quick connect to AN adapters on each end?... Wouldn't it be returnless?

[@kaizousha5531]

Oh nevermind, I guess this was kinda directed towards the N/a crowed, and a return system would still work it would just be spliced in.

[@KyleMohanRacing]

@@kaizousha5531 you can modify them for return or return less. Its a steel rail. Very easy to modify and fabricate from.

[@kaizousha5531]

@@KyleMohanRacing interesting, for example cutting and welding different ends?

[@curls6542]

Is it Benefitial to use the renesis intake with all the actuators on a hybrid turbo build. I was going to build a custom intake and delate all the actuators.

[@KyleMohanRacing]

For turbo I feel custom, or non actuated is better

[@curls6542]

Thanks, that's what I was hoping you were going to say.

[@APitStopGarage]

Mazda was Definitely thinking about atomization Rather than Flow 🔥 Like how can we burn fuel slower than Rather how can we burn more Efficiently 🔥 Glad they Tried it though lol

[@ebenezervelez9147]

Kyle I been watching many of your vids I'm thinking into do a hybrid renesis/ second gen 6 port and use the best of both engines. Do you already explore that route? Let me know brap brap .

[@KyleMohanRacing]

A 6 port FC already has good flow. 6 port intake and traditional exhaust. No issues. The renesis has bad exhaust flow so by adding GSLSE housings it helps it. What are you trying to do with the fc block. Happy to help.

[@ebenezervelez9147]

@@KyleMohanRacing I got mid plate from a 12a ( big port) the fc stays the same but I want to install the high comp rotors from rx8. Just wants to make a strong, good power, reliable motor with you help balance ect. Also like to know if the modern rx8 intake will mount on the fc. Thanks for your help p.s I'm friends with JDL

[@KyleMohanRacing]

@@ebenezervelez9147 we never had much success with RX8 rotors in RX7 motors so I don't really recommend it personally. But thats just me... RX7 rotors generally work better in RX7 applications. Also adding a bigger center port most likely cause a loss of Tq, and lower end power. The fc3s block moves plenty of air on its own. Up to you but if you want a reliable FC block use mostly FC rx7 parts.

[@ebenezervelez9147]

@@KyleMohanRacing thanks for your advice I appreciate your time keep brapping

[@KyleMohanRacing]

@@ebenezervelez9147 happy to help anytime.

[@BeaverLakeMotorsports]

Should mention to not mirror polish the runners where fuel is mixing because it will increase wall wetting.

[@KyleMohanRacing]

Yep, mirror finish is not the best either. Thats why I go for a general polished finish.

[@nicholaskallmyer9865]

What grit would you recommend when doing the final polishing?

[@BeaverLakeMotorsports]

@@nicholaskallmyer9865 anything seeing fuel 40 to 80 grit and exhaust can be mirror if you want. I polish the ssv, vdi, aux actuators and exhaust to keep carbon buildup to a minimum.

[@Indi_DevJames]

2 and a half ehhh might as well come up with a better manifold

[@ahd4415]

bro u sorta sound like Chris Chan

[@blacksnakedotcom]

hahaha yes he does