That is correct...thanks for clearing that up. Also, i am not a turbo guru so i only judge based on my own real life experience.



I like the idea of sequential setup so all available exhaust pressure can be used to spool-up small turbo at low rpms (at least 2000). However, the transition point (when bigger turbo takes over the small) felt like a weak spot because boost noticeably dropped in rx7. Based on your comments, the compound setup don't drop boost since both turbos are always online. However, there should be some trade off in early spool? I can't find boost in your log? TPS peaks only at 82%? you didn't gun her all the way?

300zx uses compound setup consisting of dual Garret T25s. Each per 3 cylinders on V6 3.0. Stock boost at 9.5 PSI and takes about 3000rpm to get there according to local 300zx owner.

You will have to check Load and convert the KPA to PSI. and doesn't look like my tps was calibrated in that log. Looks like it was taking until 3300ish to hit 20psi in this one. I'll try and find a more refined one.

The compounds actually assist in earlier spool, I never thought of it until I switched from my 16g to the compound setup. I was actually beginning to spool earlier than I did with the single small turbo.
if you have ever taken off the compressor outlet while the car is idling, you can feel the air slightly pushing out of the turbo. So with the large turbo feeding into the smaller turbo's inlet, you can just picture the advantage this has.

I know I have better performing logs somewhere. and the one did 20psi at 2950rpm.
But here's the summary of this old one. I'm sure if the boost controller wasn't trying to open the wastegates, there wouldn't be the boost taper around the 20psi mark.

2480=0psi
2847= 10.5ish
3125=18.3

2500=0psi
2855=10psi
3136= 19.8psi

That's just a standard twin-turbo setup. V-engine, put one turbo per cylinder bank. Neither turbo feeds into the other.

A VERY basic breakdown:

Twin-turbo: two identical turbos which do not interact with each other.

Sequential turbos: two different sized turbos which also do not do much to interact with each other, but have different powerbands and therefore help the car to have a wider power band.

Compound turbos: two different sized turbos which have their hot sides integrated, AND their cold sides integrated. The purpose is similar to sequential turbos. It does a better job, but is more complicated to setup and tune.

Keep at 'er, Mike

Thanks for doing conversions. 10.5 at 2847 seems on the high side. I was hopping at least 2500. When i get home i'll compare to my e316g log.

Factory turbo on EVO-X starts to come alive at about 2500rpm. Mivec (variable exhaust/intake) defiantly helps with early spool..

Do you have detailed pics of all the piping between both turbos?

I was just thinking about that being on the low side, I think we were doing tip-in tuning on this run.
If you look at the TPS I didn't start pressing the throttle down until about 2200rpm... So I guess the start points I listed above aren't something to pay attention to as I wasn't full throttle even till close to 3k...

Clear as day Jeremy. I guess one could also do combinations. Twin compound turbos or quads. I also heard of rear mounted Squires turbo which apparently smog legal in Cali. Endless possibilities.

Yes i saw that, i would even start at 2000rpm 3rd gear pull which is what recommended by Thomas at Ecmlink

There's a diesel truck out there with quad turbos feeding twin superchargers

Edit: Sorry Mike, I'll stop destroying your thread....

I think someone needs to but this diesel guy a book on thermo dynamics...

He seems to know what he's doing

have seen the 8 turbo 57 chevy??????

Here are my logs as promised.
I only get 4.2 psi at 2800 starting from 2000.


21 psi at 4200-4440


Your number are pretty good compared to mine.
Did you log it on 2.4 displacement?

Alex, why so rich with so little timing? It's definitely hurting performance!

FWIW a rich mixture requires more timing to ensure a complete burn. You are killing both efficiency and power by running like that. Judging by your 2 screen shots, timing is far from optimal. I'm curious as to where your timing is by 7K

The pull was done on stock DSM timing map and EVO stock fuel map. The goal was to iron out FPR problem so my wideband lines up with AFRationEST/Fuel table like it did with my stock FPR. I had bad luck so far with Aeromotive FPR.

The log at 4200rpm:
wideband : 10:0
AFRationEST : 10.1

2800:
wideband : 13:5
AFRationEST : 13.7

I latter updated fuel maps to about 10.9 - 11.2.


Should be around 15 degrees. I dropped it by a degree from stock. Shortly after i downgraded to factory oem exhaust and dropped boost to 16psi. This was right before i drove my DSM to LA.

Kev, i would love to study your log. Can you email one to miles556@hotmail.com ? No meth just pump fuel.

Slowly but surely.
Its been hard working on the car at my new place while all my parts are somewhere else. But I am getting there.

Also have an announcement that will probably blow your minds.
I'll save that for a new thread, once the car is running again.

She is looking really good!
240z fender flares?

Thanks

I think that's what they called them... not sure.
I just searched around for ones with correct measurements. And these ended up at my door

First drive
https://instagram.com/p/2rzrRFJfTs/

wow mike absolute monster! keep it up

Spooling turbo sound

Dude that thing sounds mad!!

Sounds like I'm on a bus with headphones on. HAHAHAHAHA


Sounds mean man, good stuff!

More pics. I'm still working some bugs out and waiting on my new front suspension setup.

Car is impossible to launch with the 245 tires and evo 1st gear.
I will be looking at setting up my 2step very soon.

Enjoy!

https://instagram.com/p/3OzT6BJfS4/?taken-by=kuttzy
https://instagram.com/p/3h-ZsbJfcf/?taken-by=kuttzy

Let me be the first to say, GODDAMN!

Nice work she looks good! What is your suspension setup going to be?

Very clean install of the fender flares. Lookin' pretty good there bud!

Thanks guys



I was talking with Peter at Hotbits. Pretty sure I will be going with a DT1 setup from him. We were doing some measurements last night.
I will be sticking with the Koni rear's for now, as the fronts will already be breaking the bank.

Is that the original paint on the car?

Paint has been redone at some point in its life. Up close it really needs a cut and buff. But it looks awesome from 10 ft away, and in pics.

You need to do something about that dirty, bent to heck front plate................Like throw it in the back seat

Nice car!

Thx braaa.

The cops don't like that the last 3 times I got pulled over.

I have a "cleanawd" license plate to go on, but I don't think it's up to that status yet.

Looks killer in person for that matter, definitely beats it since the last time I saw it with that measly 14b in there .

Love it man

Very well done, I like how the spoiler integrates with the front bumper.

Someone found me at cscs. Nice shot

https://instagram.com/p/4xXFjQDQcb/

That "turbo" you have written on the back, you should instead get one that says "turbo²"