I feel ya on that one. There was some other rotary tuner who had very “out there” marketing techniques but his products ended up NOT being good. (Steel Science Apex seals) I’d like to know what direction you go with your set up. These twins, if they’re as good as he says they are, could make for a sick build. Or you could save yourself a good grip of cash and get the BNRs for similar performance.

The big sell here, is that the BNRs are tried and true in this case. This sale is much like every other “new apex seal” that comes out. They’re fine and dandy until someone tries them and then they’re not all they’re cracked up to be.

matt

 

Fair call , ask ric Shaw performance On feedback on the Bathurst sp twins , he is currently using them on his sp race circuit car .
He is very impressed with results of power
and has not yet fitted the new front pipe to really get the full performance from sp twins .
He only runs 13psi and pump unleaded 98 Ron fuel like your 93 mon unleaded.

As for sales I’m just about sold out I’m waiting on hitachi to supply me more .

if you choose to go with bnrs i understand because his in USA and nearby to you .




im just sharing my achievements this is my hobby and passion.

im in construction and my background is avionics electronic engineering

 

Can someone post up picture of left drive 3 or 3.5inch front pipe , I want to see how good it looks in flow .

 

Google rx7 downpipe.


https://pettitracing.com/collections...haust-downpipe

 

https://cimg5.ibsrv.net/gimg/www.rx7...322a938008.jpg

3" pipe fits the standard flange well.

I havent seen full flange back 3.5" or 4" LHD downpipes.

Bigger would fit, but would need a new flange cut with the larger base circle/flange area between the bolt holes and biased toward the rear of the turbos where nothing is in the way (front has wastegate flapper swing arm).

 

Now that’s why uses guys with the USA left hand drive rx7 have such good power from oem /bnrs , just wait till you try the Bathurst sp twins

I wish the right hand drive cars had a pipe flowing that good .

Summing this all up for years uses guy in the USA have been comparing oem/bnrs twins with a good flow front pipe compare to our squash pipe around steering arm

put a squash pipe like we use and see what the power outcome from your bnrs will be ,
lot less

 

Maybe we would if you'd post more information. If it's been run for years in Australia you should have lots of results from people that were willing to shell out the money.

 

I’m guessing most people that run the Bathurst sp twins don’t want to go through the debate and arguments I’ve been going through with twins vs single or bnrs vs sp

only thing I can offer you is money back guarantee if it doesn’t make more power than bnrs twins on same boost . I’m that confident that I will refund your money .

 

I'm not going to buy both so that guarantee doesn't help.

There are quite a few people here that seem genuinely interested. Why not help us commit?

 

Ari from rx7 store , anyone that’s interested they can contact him .

 

I have a set of 93 turbos I made 345rwhp with stock port, 13.5psi, HFC and RB duals.
I am about to put in a set of BNR Stage 3 and see what I can do.
Would be great to run the SP turbos as a comparison when you have stock.

 

from my testing , on 13.5 psi with sp twins and good supporting mods you will see close to 400hp at wheels
With a power band of 2800 to 8000rpm

and no boost drop


call rx7 store and organise a set of new sp twins through them .

 

Found this from the man himself.

https://www.rx7club.com/single-turbo.../#post12048314

Not sure why he was so reluctant to post this info when he posted it himself in the past.

So really the only things we’re seeing different with these Bathurst models are bigger AR compressor covers over the BNRs, bigger turbine wheels, and bigger compressor wheels.

Matt

 

Interesting. Maybe I can just buy a set of SP KAI from Banzai and then ship them to BNR and see what he can do.

 

Those were old model sizes , sp KAI is 3 kai model standard compressor covers with a 43.2mm compressor billet wheel
good for another 15kw at wheels than standard

but it’s good uses are committed to try are improved bnrs stock refurbished Garrett/ Chinese hi flow hitachi twins .

i guess someone has to help him will RND cause he’s still in the past design.

I don’t know why you would waste your time doing something that’s already done .

Good luck

 

I don't think you know what you are talking about. The only thing refurbished on BNR are housings, they get all new CHRA, wheels, shafts, etc. and the wheels are not 10 year old designs. They are updated aero which I would bet is better than the hitachi and also lighter shafts, and 360 bearings just like you did on yours.

So explain how yours is current tech and BNR is in the past?

The housings don't exactly wear out. Just need to make sure there is not excessive cracking. So "refurbished" vs new is not really an issue here.

I'm not a BNR fanboy or anything. But I'm not paying a premium for unproven claims and the first thing you do is to go back and bash your competition for being 10 years behind but say nothing about what actually makes your technology the current. I haven't seen any other turbos from hitachi claiming the best performance like an EFR TI exhaust wheel or billet compressor wheels etc....

I'll stop wasting my time on this, you clear don't want to do the minimal amount of work it takes to explain why yours are worth a premium. Just sales pitch after sales pitch without detail. "Latest technology" doesn't get sales, explain what the tech actually is gets the sale.

Goodluck to whoever buys these. Still interested in seeing how they perform for curiosity sake, but it won't be on my car.

 

Ric ran his car up at Bathurst recently, not sure how much effort was put into his drive and the high temps certainly wouldn't have helped the cause, but he was around 7 or 8 seconds slower than the last time he was up there with a 8374 rx7 about 6 years ago. I do wonder about the diminishing returns of shoving a bigger exhaust on these things when by far the biggest restriction to output and longevity is in the manifold. The graph for these twins at low boost was posted elsewhere several months back - dyno dynamics - more similar to a 7670 than either of the other EFRs.

 

That's what I was thinking. But was really interested because the power output claim looked more like an 8374, which would be awesome. But looks like too good to be true or the real world data would be bragged about all day long.

 

Dynos results EFR 8374 366kw at wheels 23psi boost E85 fuel

and on the bottom Bathurst sp hitachi MADE IN Japan twins 400kw at wheels 23.5psi E85 fuel.

Your all talk and no facts

way don’t you put up some facts , dyno sheets on these BNR refurbish Chinese made Garrett cores twins

anyone with any knowledge on turbos would know that gt28 core with 47mm exducer wheel with 24mm blade height has no chance of flowing more than my old model 51mm exducer.

Sometimes bashing is required ,its important that people out there know the facts and other better options , so In this case bashing is a good thing , I guess this is why forums were formed to call out the bullshit .

And Sp costing more $$ because they are all new and make the power and cores and all made in Japan there a lot of extra components added for the extra performance that standard hi flow twins just can’t produce.

As for rics new built sp car he’s only ever ran my sp for day dot , he did have another race that he ran single efr and big intercooler but that was on High boost and different class , two different cars

but he did say that on 13 psi with Bathurst sp and oem sp cooler which is not much better than standard cooler that it made the same power as efr running 16psi with big cooler .

but his ran his new sp race car on 11psi because cooler in not efficient.

so if it when slow wasn’t because of power .

but good try , just post up half the info . Ha



https://cimg0.ibsrv.net/gimg/www.rx7...3f9e7925f6.png
https://cimg1.ibsrv.net/gimg/www.rx7...e25fb5f840.png
https://cimg3.ibsrv.net/gimg/www.rx7...7be5ff9d65.png
https://cimg5.ibsrv.net/gimg/www.rx7...b0a872e4c9.png

 

Dude. I'm a potential customer. In what world am I supposed to gather the facts and tell the story for you. And a good product never requires bashing others.

Again, you just posted another sales pitch without real data. I do not care that these are made in Japan, that means nothing yet you keep repeating it. And you keep jumping on the refurbished issue, but again, it's just reused housings with everything else new. That absolutely doesn't matter to me as a potential buyer.

Show the dyno sheet of the EFR vs SP you compared along with all the supporting mods to each car. Don't just throw out random numbers.

 

omg are you for real or just playing with me , dyno sheets are there 366kw is efr8374 and my Bathurst sp twins graph 400kw

supporting mods you see some on pic like hks v mount , mod port engine , big fuel system , 3,5 inch exhaust the usual .



And Only main differences is I’m running my twin past intercooler and oem high flow injector ,3.5inch exhaust ,cat , etc usual upgrades

it seems like your the only one that can’t swallow the true .

Stop fighting over the facts , we are all rx7 enthusiasts just be happy that I’ve spend a lot of money and time to make the twins great again .

AND IM STILL WAITING FOR BNRS power graphs , If you claim there better them show me .

bye have a nice day .

 

Wow. Yes I'm sooo happy you have spent a lot of money....

Good luck with your sales.

 

I can't even believe this is still going on!! Look, Doctor, If your twins can somehow negate the awfully restrictive manifold design of the twins and rock up with 650bhp then please please please end this with genuine proven dyno graph dynamics/dynapac/ or whatever.

Even with your US hugely optimistic ( our our hugely pessimistic dynos) if you can even get 600 then at least this saga is closed.

This will undoubtedly sell your kit massively, make your millions and shove one up the doubters brown eye.

I expect I'll just see more meaningless words but please man, if it does what you claim, prove the ******.

 

Yeah. Proven 600whp on twins would be so awesome. I'd buy another FD just to put another set on haha.

 

The 8374 car at Bathurst was running 270kw on 98 - supposedly on the uncalibrated and conservative dyno (DD) - according to the owner. "High boost", not really a thing up there beyond momentary via an ebc. Even with his extension to the stock tank to take it out to 90 litres, if he upped the ante continuously and didn't encounter yellow flags, he'd be sitting on the side of the track with an empty tank waving to the other cars as they went by for the last 10 mins of the race. It did have a v-mount rather than a smic, a pretty big advantage especially on that 12hr weekend of high 30/low 40C temps, no matter how many pass in the core.

Both SP dynos (DD) I've seen at the same boost were near 260kw, different dynos, but still dyno dynamic. Dyno operator was impressed, but he said, a modern single was superior even at modest boost and could only improve as you increased pressure. It should be fairly evident with no turbo control and precontrol flaps to encounter or right angle direction changes pre turbine at lower rpm and then 2 post, to get into the exhaust.

Early stage 3s were 230~240kw at around that figure on pump depending on exhaust/cooling, not sure what the later ones do or the new hitachi versions he's offering.