still slow lol

 

I'm going to rape your cat with a plunger.

Confirmed.

Was that a ninja I just saw?

 

Ryan, are you coming out this Thursday, like in 2 days? I thought that was the plan, but then you said "next Thursday", then back to "this Thursday." Sorry we couldn't get it done last Friday, but we normally log at least 50 miles with lots of shifts to get the clutch and flywheel seated well before unleashing over 400 ft lbs. We will get your clutch rod adjusted and turn up the torque when you come in.

 

Sorry matt, didn't mean to be confusing. it will be the 2 days Thursday, the 27th.

Don't apologize man. You all did a stellar job. That clutch noise is definitely getting louder and stuff too so if you all could take a look at that, that would be awesome too.

I'm super stoked. Now I have like 10 people wanting to come with me! So it will be fun, and many of them want to buy stuff too!

 

The noise you described sounds like the release bearing. Hopefully is will quiet down when we adjust the rod.
Bring as many people as you like, or better yet, bring a group out for our event July 29-30!

 

Good deal! And yeah hopefully my Ion buddy doesn't flake out on me..AGAIN!

I'm excited.

And yeah that's what the clutch issue is. i'm not worried, it will all come together.

Are you all having a booth at the CED meet in june?

 

maybe ill bring my ride to that.

 

What makes the torque to drop when the boost is constant? Airflow?
If the airflow drops, what might cause this? Turbo efficiency, cooling efficiency of the charge?
ZZP do you have a compressor map for S252 which you might share?


What makes this Bullseye S252 ET turbo so great compared with other turbos, because reading from this dyno I see a tq threshold at over 4200rpm, isn't this should be lower to be better than the other turbos?

 

I'm not sure that you understand the correlation between torque and HP. You can see that the HP is still climbing at 7300 RPM. If torque was staying flat, then the HP would be climbing at a ridiculous rate. 400 ft lbs at 7300 RPM is over 550 whp. As far as airflow falling off, that would mean that the HP is falling, which it clearly is not.

The boost curve is based on when I went full throttle, and in no way represents what the turbo is capable of. Remember, we just installed a new clutch in this car. The last thing I would want to do is hit 25psi at <3500 RPM. I have posted logs showing 20+ psi at 2750 RPM with this turbo on my car.

 

I know all that Matt, isn't more desirable to have a lower max value of tq but flat? In this way the stress put on clutch, tranny, engine etc would be less also is capable of reaching high hp in top rpm? Also for the feel isn't flat tq better?

I don't know if I understood correctly this, the dyno starts at 3400rpm, the boost is raising since then, it wasn't a WOT from there up to 7300rpm?
I don't mean what this turbo is capable of as general but in our application. All I have read says Garret turbos are weak nowadays because can't keep the tq (for our application) up top and spools late but in the 2 cases with S252 kit presented on this forum the tq threshold is after 4000rpm and it drops.

What makes the tq to be flat in our case (I know you do it with S256 from 3800rpm)?

I know that Matt too, but applying more load doesn't prove how soon this turbo will spool on real street conditions. No need to prove the potential of something if we can't reach that potential in real life street conditions.



Sorry to bust you with so many questions but I'm trying to figure out all aspects and to be fully aware of this kit when will be available for Kappa. Thank you for all your replies.

 

A drag strip is a hell of a lot more punishing then any street I have ever been on

 

In most cases you could benefit from a flat torque line. This would be true if you are pushing towards the edge of knock. In the case of the LNF, the main limitation is injection timing. Even with raised fuel pressure, you have diminishing returns above 425whp. Because of this, we flatten out the HP and push more torque.

The reason torque was more flat on the 256 was because boost kept climbing throughout the pull. That was on a manual boost controller, but we are using ECM boost control now. Ideally, I'd like to run that way, but stock connecting rods don't like 9000 RPM and the fuel system doesn't support this. There is also limited control in the ECM for a setup running to 9k rpm.

 

Boost building while RPM's go up slowly is creeping , from what I understand this can be bad ..

 

Boost creep would refer to a situation where boost keeps climbing based more on load and time, not necessarily RPM. The setup I was running would drop down a couple psi on the shift and climb again based on RPM. It's perfectly safe as long as it remains predictable.

 

Saved this in my favorites to follow.

Great choices OP, and great job by ZZP once again. Makes me miss living back in South Haven, and the w-body guys. Would love to show for your event.

 

Thanks man, appreciate it.

going back to Michigan to get my big boy tune today ladies and gents! So excited!

 

Locked in to see numbers

 

You can easily load the turbo hard enough to boost below 3000 RPM in real street conditions. However, I would only expect this to happen in light acceleration situations. Any time I want to go fast, I'm never below 5000 RPM, so it's irrelevant anyway.

 

in for the numbers. looks good

 

this is great cant wait to see the numbers and see a few vids of this!

 

Cool thanks for clearing that up.

 

just read every post in this thread..wow school is boring.

anyways, nice build dude! but it seems like so many on here have the Tial 50mm bov.
excited to see new numbers.

 

cause its pretty much the best BOV there is out there

 

Thank you for your answers Matt M, hat off in front of your knowledge and achievements about LNF.

 

Holy **** this car is nice. I can't believe I just now so this thread. I need money for that kit!!!