as you can see the 1.06 Garrett hotside flows in the same neighborhood as the Tial... advantages w Tial probably are weight mainly. i am running the Garrett 1.06 based on Luke at Beyond Redline's suggestion and am very surprised how immediate my 8.175 sq inch 4094 comp wheel feels.

howard

 

Looking at flow and charts, there is almost no diffrence in flow from the GTX35R with a tial 1.06 housing and the GT4088R with the same housing. We are talking about 3lb/min or so. Could get the exhaust housing ported i guess. But would be better to just use a 60mm tial wg wich is proparly routed to get the exhaust out instead. Think the GTX35 will flow better then the T04z turbo that used to be on this turbo.

So im gonna go with the GTX3582R with a Tial 1.06 housing. Gonna talk to Sean about sourcing one just after new year.

JT

 

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I might be missing something here re: turbo sizing.

Me thinks basing an engine’s HP potential on displacement and a compressor's map alone is incorrect.

Me thought the amount of MAF (mass air flow) [not CFM] an engine can ingest at a given RPM is a function of displacement, Vol-Eff, BSFC, and air's density.

i.e., assuming by installing a turbo the size of the engine itself = 1 gazillion HP is not quite correct.

 

^haha

 

You realize wastegate size has no affect on "getting the exhaust out" at all right? Wastegate is used to control boost, not backpressure. Backpressure has everything to do with the manifold and turbo sizing, and nothing at all to do with the wastegate size. For a 35R sized turbo, you'd be more then fine with a 44mm tial even at low boost. You want a wastegate that will flow enough so boost doesn't spike when the turbo spools up, anything beyond that is not needed. Now if you plan on getting a bigger turbo sometime in the future, then sure get a bigger wastegate but a 60mm wastegate is way overkill for a 35R (GTX or not).

thewird

 

Thought I might I add I tuned a mild port GT3788R 13B it made 534rwhp uncorrected on 25psi on bp ultimate water injected dyno dynamics

 

Not necessarily true. I've got a 35r turbo setup that's boost spiking due to our upper intake manifold being installed. I wish I saved the video I took of it spiking up to 25lbs! It only holds 18psi if you slowly get into boost once there then only can you let it rip.

I'm sure it's related to the manifold construction (NOT MINE) but I'm not going to elaborate on what company built it. If anyone's really serious about their more than modest single turbo setup, I would suggest controlling boost with nothing smaller than a 50mm wastegate or opting to dual gates.

Winter's cut off our street mode testing but I might be working with a southern FD owner to continue. I think the forum needs a "testing section."

 

+1....a designated Thorough Research and development section.

 

A small thread jack but relevant question based on a photo Howard provided. Putting the BOV or not-to-BOV debate aside. Howard is your BOV attached to the bottom end tank of your IC? If so, why do you claim this is the optimal position?

Thank you!

 

i think BOV placement is a serious issue. my primary consideration is that the huge hole for the BOV not be disruptive of the compressed flow and as such the last place for the BOV is the tube between the IC and the elbow. everything from the IC downstream needs to be non restrictive.

given most of the end tanks are of flat surface i really like them for the location. either end would work fine but there wasn't room on the upstream side w the turbo inlet etc. i ran this setup on my Twin TO4s for four years and it works great.

my housings arrive home from Pettit wednesday so we should be back on track shortly.

howard

 

Cam/PettitRacing/ delivered both ontime and as advertised.

due to diffuser failure my apex seals were unable to rotate and chattered the housings as well as lost compression. fortunately we didn't continue ahead or the housings would have ended up in the scrap pile.

they did have modest chatter marks and i had circumferential scratches over the entire housing surface.

Cam said he could fix them...

take a look:



with the retail price of housings at $798/Mazdatrix Cam's service is increasingly valuable. chattered housings don't make very good compression and are very hard on the apex seal crown.





Cam fixtured the purpose built intercoolers for this upcoming test and certainly helped out w the engine.

thanks Cam.

HC

 

those look new! Nice work. I take it that Cam only does these when there is very minor spots? Whats the work cost?

 

run without a BOV, it's not a stock car so a little compressor surge is worth not having to deal with crappy or overpriced ricer blow off valves sticking, losing power or sucking money out of your wallet. (mines staying shut until i redo my piping for the v-mount then it will be omitted).

 

Is Cam actually doing this in house? Be interesting to compare this to what Goopy is doing very inexpensively and providing amazing results on used housings.

 

The better the housings condition the better results you will have. In MY experience, as long as there's no flaking or lost apex seal wars you'll be VERY pleased with the results...

 

talk w Cam re specifics and the cost is $100 per housing...

 

I'm going to have to go through my stock of used housings, I may have a couple I can send down to Florida..... wonder if Cam will be at the 24 Rolex race at Daytona, maybe I can hand deliver

 

Why Hide the exhaust ports?

 

Secret ports for magic p@wers lol.

thewird

 

Just Funny how people were just saying how closed lipped everyone in the rotary world are.
And then I saw this..

I mean honestly. WTH are you hiding? Some secret nasa designed spacecraft? It's a freaking hole in a housing how much rocket science do you really think there is here?

 

It doesn't really matter regardless. Theres 2 options square and round. The Mazda papers on this **** tell all there is to know.

 

That's exactly the point i'm trying to show.. Why even bother hiding it then?

 

Hey ya never know, it could be some new fangled design. Kind of like the cooling inlet ports on the side of a ferrari they are not round or square...the start narrow and flare out. I am surprised no one has done the same on an internal combustion application like the rotary. Good R&D still to be had!

 

They are called NACA ducts and they were invented in 1945