Boosted reliability

Turbos? Superchargers? Step this way...
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V8 Power
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Boosted reliability

Post by V8 Power »

I am very seriously considering supercharging my track day rex using the DNA set up.
My engine has been freshly rebuilt with streetporting and bridgeporting on the tertiary.

I will loose my warranty coverage on the rebuild for starters.
In view of this how reliable should a well maintained supercharged freshly rebuilt RX8 be running around 6PSI of boost?

I appreciate the added power will put more strain on things but is the engine likely to expire sooner rather than later?

It is a weekend and trackday toy that gets hammered but low mileage (3,000 a year).

Any advice greatly received.

Thanks

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Re: Boosted reliability

Post by Will66 »

How long is a piece of string?

With the right supporting mods, increased oil pressure, better oil (consider a Sohn adapter), decent cooling (consider water/meth injection) and being fastidious about warming it up before beating on it then it may well last about as long as an N/A car but you'll need to keep an eye on things like AFR, fuel pressure, oil pressure, oil temp and accurate cooling temperature.
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Re: Boosted reliability

Post by benedunn »

I think over and above all of the above ... proper mapping is the most important factor.

With that in mind Meth injection is a risk not worth taking on something that you are concerned about reliability on (run out when you don't want to and its bye bye engine, plus mapping is complicated)
I'd do away with the OMP altogether, makes more room for the turbo, sohn makes even less room

the other of wills suggestions I'd recommend for any car, turbo or not :D
Please excuse the spelling mistakes ^^ :D

I'll second that!

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Re: Boosted reliability

Post by MadTaz »

Hit the nail on the head there Ben! Mapping is key!

Although with the set up you're considering I don't beleive there is an issue with fouling of a sohn adapter
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Re: Boosted reliability

Post by Murf »

What would you replace the OMP with - just premix or is it possible to fit the OMP with a Sohn adapter somewhere else to feed oil in still?
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Re: Boosted reliability

Post by Phil Bate »

No OMP = premix only. The pump has to go where it is as it's driven by a shaft in the front cover. That is only a problem with some turbo setups where the manifold fouls it however, and not an issue with a S/C.

As for water/meth, you can run a fail safe that cuts boost if the tank level is low, or even if the injector pressure drops
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Re: Boosted reliability

Post by V8 Power »

Thanks for all the info guys :thumleft:

Other than GroupB who else is capable of excellent mapping?
I like choices.

Thanks
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Re: Boosted reliability

Post by Phil Bate »

There is a guy on rx8club.com under the name Brettus - he knows his stuff and does remote tuning with MazdaEdit
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Re: Boosted reliability

Post by Flameshades »

I have been and continue to tune mine with Brettus, and I have to say the man is a machine!
i can also confirm that Sohn and turbo is V snug fit.....
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Re: Boosted reliability

Post by V8 Power »

Have you got any contact details for Brettus?

Thanks
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Re: Boosted reliability

Post by V8 Power »

After costing the DNA Procharger inport, VAT, install tuning etc I have decided to go another direction.

Once I have loosened the purse strings I will be sending my Rex back to Carl Hayward for either a larger CC custom NA build or a RX7 Turbo swap.

Already getting excited!
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Re: Boosted reliability

Post by cib24 »

I was speaking to Carl the other day and he told me a bit about a larger CC 2-rotor engine that he was working on. He said it was larger than the 16x concept as well and closer to 2.0 litres! Whoah. He's always trying crazy stuff out in order to find more performance and reliability from rotaries.
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Re: Boosted reliability

Post by rameshr »

I have been looking at DNA's super charger, this is what I have:

We are located in Sydney, Australia total kit price is approx US$6500
kit includes D1SC supercharger US$3K
brackets and pullies US$1000
intercooler kit and BOV US$1500
engine management US$800
injectors battery relocation
Its a complete bolt on system
This works out to approx 5500 pounds after shipping.

Would £500 be enough for mapping? if so for £6000 this is pretty cheap? I would have to install myself with a lot of help from my forum friends :)

Maybe a group buy?
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Re: Boosted reliability

Post by Essex2Visuvesi »

Dont forget to add another 20% or so to those prices for import duties
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Re: Boosted reliability

Post by rameshr »

I knew I forgot something!!!
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Re: Boosted reliability

Post by Ryan Rotary Performance »

rameshr wrote:
Thu Mar 22, 2018 10:53 am
I have been looking at DNA's super charger, this is what I have:

We are located in Sydney, Australia total kit price is approx US$6500
kit includes D1SC supercharger US$3K
brackets and pullies US$1000
intercooler kit and BOV US$1500
engine management US$800
injectors battery relocation
Its a complete bolt on system
This works out to approx 5500 pounds after shipping.

Would £500 be enough for mapping? if so for £6000 this is pretty cheap? I would have to install myself with a lot of help from my forum friends :)

Maybe a group buy?
If there really is a market for an SC kit then I will make one, happy to put out specifications and prices of a kit I can produce if we can get 3 people committed.
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Re: Boosted reliability

Post by PeteH »

Weird though it seems, I would consider charging my existing engine. It would be interesting to have the option of a triple and a SC twin.

If you can do it for less than about £6k.

Two more?
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Re: Boosted reliability

Post by warpc0il »

I thought that speel chocker had jumped in then, 'til I realised that you actually did mean "charging my existing engine" and not "changing my existing engine"

The problem with being dyslexic is that I sometimes read what I think people are (most likely) saying - though that can help with some peoples posts ;)
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Re: Boosted reliability

Post by Ryan Rotary Performance »

PeteH wrote:
Thu Mar 22, 2018 2:49 pm
Weird though it seems, I would consider charging my existing engine. It would be interesting to have the option of a triple and a SC twin.

If you can do it for less than about £6k.

Two more?
I could probably do it from £4K, I had designed a modular upgradeable package low boost with no charge cooler from around £4K to an all out high boost with charge cooler at £6K....

The idea was that most will buy the low boost option first then at a later date upgrade to the higher boost option
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Re: Boosted reliability

Post by Delanor »

My main concern with this is engine reliability and being only on 27K after a 10 year ownership if I was fairly certain it could take it I would seriously consider it as I intend on keeping my RX-8 until it has rotated its last rotor as it were. :lol:

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Re: Boosted reliability

Post by rameshr »

The 4K option what increase in power can we expect? I am forever thinking of saving for a m3 or a track focused car but I love my rx8


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