Our latest project has been the development of a turbo Renesis engine for our Redline Time Attack RX-8.

We have designed and built a new manifold and downpipe, and will utilize a Turbosmart wastegate and Turbonetics T4 turbo.

The Renesis has been machined here at Mazdatrix for the oversize stud kit that we sell. The stock rotors have had the apex seal grooves EDM’d to accept the taller and stronger 86-95 style apex seals. We will be using ceramic seals, and the rotors have also been side cut for extra clearance that is preferable in highly stressed engines.

The plan is for the engine to be on the dyno in the next couple of weeks - we will be busy this week with the Formula Drift finale at Irwindale Speedway - and then we will be on track in October 23-24 at Infineon Raceway for Redline Time Attack.

We have posted photos of the engine here: http://www.mazdatrixracing.com/?p=394

 

I like the sound of this - keep us updated !

 

Are you using a Haltech Platinum Sport?



Also, could explain what's going on here with the manifold? Why did you choose to collect the exhaust in this way?

 

Wow, that manifold is beautiful.

 

Looks like center and side port exhausts; rotor housings from a RX7?

 

it looks like it might have a 7 housing ... I see the exhaust...

 

Looks like Renesis housings that are punched for peripheral exhaust as well as side.

 

Six exhaust ports and five exhaust pipes.

Using earlier RX7 rotor housings.

 

wow - are they renesis housings bored out or from an earlier engine ?

 

Very Nice...

 

wow!!! very nice!

 

Looks amazing. I had a similar idea about a year ago but didn't have the funds to pursue it. Interested to see what kind of numbers this puts down.

I'd thought about using a shutter system to keep the peripheral exhaust ports closed at low RPMs for streetability. Packaging that with the manifold was the conceptual challenge I never sorted out though.

Looks absolutely wicked, love how clean it is. Can't wait to see it in the engine bay

Any mods to the motor mount? Looks kind of like you removed material to make the manifold fit?

 

subscribed

 

*scribed

 

Yes, right side motor mount is modified.

We cut off the top part and replaced it with a steel (stainless to match the manifold) arc thing going from the outer upper part of the metal mount to the manifold flange. It is part of the manifold.

84-85 GSLSE 13B rotor housings. Done to remove the stress on the side exhaust port edges. The heat of boosted engines is a real problem there as the casting is so thin. The metal of the port edge actually rises up and contacts the corner seal, which then damages the side housing(s). We have seen this on our own engine and on customer engines.

The "plan" is to have the majority of the exhaust heat go out the peripheral exhaust ports and relieve the stress on the side exhaust ports. Great theory -- hope it works.

Should sound really interesting.

Car, with turbo, will be on display in the Mazda booth at the Formula D finale at Irwindale this weekend (Thursday - Saturday 10/7-9) if anyone is in the area.

We are fabricating all the intake piping over the next 1 1/2 weeks (minus the display time). The engine - oversize studded, EDM'd apex seal grooves, ceramic seals, etc. should be ready for installation next week?

The Haltech Sprint-RE has been working fine, but we are changing over to a Platinum 1000 to gain more control of all the turbo extras.

If all goes well, then to the chassis dyno, then off to Infineon Raceway 10/23-24 for the Redline Time Attack.

 

Waiting for the testing results. Good luck Dave.

 

Damn, this idea seems to be more apparent than I thought from a theoretical turbo performance perspective it makes sense. It will be interesting to see how it plays out in reality. Assuming no port timing mods:

Primary intake opens 3 deg ATDC
Secondary intake opens 12 deg ATDC
Auxiliary intake opens 38 deg ATDC

Primary intake closes 65 deg ABDC
Secondary intake closes 36 deg ABDC
Auxiliary intake closes 80 deg ABDC

Peripheral exhaust opens 71 deg BBDC
Side exhaust opens 50 deg BBDC

Side exhaust closes 3 deg BTDC
Peripheral exhaust closes 48 deg ATDC

 

/\ Brap brap brap

 

This looks interesting, 'scribing

 

can't wait for the video

 

i feel somewhat vindicated
I started a thread about adding the P port to the renasis and it was shot down.
Old news.

Very, very, sweet, sick and solid looking engine you got there dudes!
Adding a steel part to the upper part of the MM? Did you fill the insides with hockey pucks?
Those 3" header pipes??

Use rx7 rotors?
power goal range estimate?
Stay away from 9K without more eshaft and rotor work?
Water meth is your friend--can you use it? Even just water will help--right?

Sorry--too many questions--i just get excited seeing that damn thing!
Really nice.
OD

 

Hardly. Besides, they just said that isn't what they did - they are actually using older housings.

 

Not really shot down OD - more popinted out the issues with the p port as far as streetability goes .
This is an all out race engine so none of that matters here .

 

Cool.

 

True that--my bad. For a moment I thought I had an oridginal thought. I should have known better.

Its still a really really good looking set up.
It will be interesting to hear if they are running the rx 7 rotors.
OD