Jump to content
SAU Community

Atr43ss-2 Prototype Initial Tune 250rwkws 18psi<2500rpm, Stupidly Responsive


Recommended Posts

  • Replies 118
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

Looks like the turbo could be out of flow. Given there is a 20rwkw drop from 5000-5700rpm :)

I'm guessing the results drop severly hard after 5700rpm? That is why run stopped?

Were there any issues with boost control or just compressor running out of puff/flow?

for what it's worth the stock turbo looks like;

160km/h = 5714rpm = 195rwkw

170km/h = 6074rpm = 189rwkw

the stock turbo seems to peak at 5700rpm ish

and the prototype seems to peak at 5000rpm ish

this is based on my stock turbo tune

neither is right or wrong just offering data

i think a 33 GTST with that powerband would be pretty sweet on the street

its a good 50rwkw ahead everywhere in the power band so it should be shit hot

for what it's worth the stock turbo looks like;

160km/h = 5714rpm = 195rwkw

170km/h = 6074rpm = 189rwkw

the stock turbo seems to peak at 5700rpm ish

and the prototype seems to peak at 5000rpm ish

this is based on my stock turbo tune

neither is right or wrong just offering data

i think a 33 GTST with that powerband would be pretty sweet on the street

its a good 50rwkw ahead everywhere in the power band so it should be shit hot

Looks like a tad bigger would be far better suited to the motor though. Enough to get it flattening off around the 6500 mark would be far better.

Impressive results nonetheless.

i drove this car today.. it is an ANIMAL of a street car! absolutely in love with the response... congrats Stao :wub:

i didn't really rev it out to redline, probably only about 5.5k, so i didn't get to experience the drop off in power.. still heaps of fun though

I'm modeling a turbine housing that has external gate ports in and out to have an external gate replacing the current actuator setup. So boost control issues is going to be history. shortly.

Looks like the turbo could be out of flow. Given there is a 20rwkw drop from 5000-5700rpm :wub:

I'm guessing the results drop severly hard after 5700rpm? That is why run stopped?

Were there any issues with boost control or just compressor running out of puff/flow?

looks to be like the compressor has plenty of puff and the exhaust housing is out of flow..

No NO. Please do not cancel your trip for this turbo. There are still few things I'm doing to get it perfect. I will make it commercially available when ready.

With the drop it could be if the housing's maxed, external gate should solve abit of that issue. We see what happens.

I too can attest for this turbo, Stao let me take it for a spin on saturday. Car is super responsive, 1st and 2nd gear are just insane and third pulls very nicely but looses the insanity slightly. But by then your doing over any legal speed limit anyway. So if its response your after I would definitely recommend this.

Thanks again for the drive!

Would I be right in saying this is a HKS GTRS replacement?

Would I be right in saying this is a HKS GTRS replacement?

I dont believe so... needs to touch 280-290rwkw and maintain its topend while still beeing internal gate to get up on same level, i'd more so go with its a 2530 replacement considering the figures and much better response...

I would say it looks a close thing with a HKS GT-RS although it is coming on quite a bit earlier.

Getting a HKS GT-RS to 280-290rwkw is stretch with very few getting there from what I have seen.

250-260rwkw is probably a more realistic expectation.

^ yeah but holding to 7500-8000rpm is also looking like a problem.

Although given a lot of people want bolt-on replacement for "stealth", not sure going to external gate is going help sales as such :P

^ yeah but holding to 7500-8000rpm is also looking like a problem.

Although given a lot of people want bolt-on replacement for "stealth", not sure going to external gate is going help sales as such :P

agreed, the exhaust housing to me really seems to be the bottleneck in the setup.

My GT-RS is managing 253rwkw at only 14psi (i know different dynos vary, but thats on the godzilla motorsports one).

So im hoping its capable of 270rwkw-280rwkw with 20psi through it.

This turbo looks alright.

I dont believe so... needs to touch 280-290rwkw and maintain its topend while still beeing internal gate to get up on same level, i'd more so go with its a 2530 replacement considering the figures and much better response...

I have never seen one make 280-290 rwkw on a stock rb25.

Same as I dont think I have seen a 2530 make 250rwkw...

seems like this thing would drive like a V8 haha.

i think its near impossible to have a turbo be as responsive as this and make decent top end.

the small rear housing will refuse to hold high boost at high rpm, therefore peak power at 5,000 odd.

but peaking at 5,000 i think seems a waste of the revving nature of the RB.

truly a street turbo; lots a power in the early rev range, but with no top end.

would be interesting to see how you go with boost control.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Latest Posts

    • Thanks for posting, your engine bay looks tops. I'm fairly sure you posted the wrong video though, I think you were supposed to upload the one from your "private test road" where it's banging off the limiter with the gate open?
    • This is something to be careful of. I did a bit of digging on the NM35, as I spend a lot of time on near brand new cars and CANBus related stuff, which uses the same "OBD2" plug for a fair chunk of making my life easy. The NM35, does NOT support OBD2. The data pin is actually on Pin3, which is a manufacturer specific pin, and requires Consult3 to connect to the NM35. Your low voltage, is either because the NM35 doesn't have 12V to the constant power pin on the J1962 (OBD2) connector, OR, it is attempting the standard comms, (CanBus, K Line, etc) and can't see any voltage on those pins. Some people have had success accessing SOME data from the vehicle on OBD2 specification, using a module that supports KPW. My assumption, like Duncan has stated, it will likely actually be JOBD, where there is some cross over with the OBD2 and JOBD standards. Note, lots of "OBD2" dongles, do NOT support KPW, which is what you need for a lot of Japanese vehicles of this era (And even up until recent years!), EG, Subaru, Suzuki, etc.    The end of this thread is probably worth a read, as some people did find a way to get a display up in the NM35 recently, looks like someone implemented all the stuff needed to make it work. (The right protocols).  
    • Depending on the purpose of the car, and how much more fabbing you want to do, and what clearances you have, you could look to raise the motor, which will raise the front diff up. Likely would mean altering the chassis rails etc etc, hence the more fab work you'd need to do. However, this can create issues, not just in clearance with everything fitting under the bonnet, but you've also raised a LOT of weight up in the car, and this will DEFINITELY alter handling characteristics (But, so will how much weight you've already added to the front end). You'll also have to deal with the fact the gearbox to rear diff is now out of alignment too for the tail shaft, and alter the angle of the diff, or deal with a bit of potential vibration. Raising the motor an inch up, is effectively the same as making the whole car sit higher by not lowering it as far. So one inch higher motor, theoretically means you can drop the car an extra inch lower, and maintain the same angles in the CVs. Again, depends on the purpose of the car. If it's a just cruiser on the street car, maybe won't be an issue. If it's meant to be a time attack car, I can see you not wanting to raise the motor. This is just for you to ponder as an idea.
    • Have you not seen geospy.ai? It can now give GPS co ords to within a metre from a photo, even if it's a random photo you take inside. Supposedly at the moment only the government/law enforcement has access to that... Supposedly...
    • I've got the rear ones, they're certainly beefy. I need to take them to my driveshaft guru to check over, he's very fussy about the quality of components so I'll let you know if they are made of cheese by a blind man.   Are you in Australia? A mate just had a set of EN26 shafts made for his K20 Lotus by our fabricator which were quite cheap (compared to Driveshaft Shop) so if you can procure the CV's and draw what you need he'd make them for ~$800 for the pair.
×
×
  • Create New...