hp = torque*rpm/5252.

 

The 35r has a way bigger turbine wheel. Im talking about small turbine, big compressor, this engine would love that.

 

Tasty...

 

thats the recipe for any "street car" with big power admirations.

 

True that. I think if they would keep their current turbine size the same and increase the size of the compressor, theyd have a "mostly" stock powerband with the added boost in there. Just my 02

 

The stock head and cams are probably holding it back a little. Good numbers, but tune needs some tweaking no doubt.

It is breathing through their 3" downpipe but still has the stock 2.5" exhaust switching to 3-3.5" will show decent gains in the top end. what troubles me though is the loses down low hopefully they will be able to fine tune to help low end power.

 

just wait till steve gets there and does some extra fine tuning on it

 

Actually a bigger compressor would likely exacerbate the turbo lag seen here. It's a lower trim,bigger turbine that would benefit most here. It would reduce the turbine inlet pressure considereably, generating pressure sooner due to the higher turbine efficiency.
With that nice header they got there, they would move much closer to the coveted positive MIP/TIP ratio, where for a narrow band there is more intake then exhaust manifold pressure. THis nets huge torque returns and can reduce egt's in a DI motor since most fuel is injected during intake only and a small amount during the compression stroke if your really stuffin' the lbs/min thru there.

We dont have full control yet but changing the beginning of the injection event to happen later would allow air only to bypass to the turbine during certain ranges. reducing EGt's.

 

The currenty version allows you to increase the rev limiter, just increase oil temp limit, trans limp, transiant limit, normal and short incr in fuel control>fuel cutoff.

 

I'm sure you meant to say something different than that. Otherwise a Honda Si engine couldn't have peak torque at over 6k rpm.

 

Thanks, raised, time to hit the dyno again tomorrow.

 

I think you'll be okay here, they have a thin candy shell. 'Surprised you didn't know that.

 

notice i said its all related to how the engine builds power past that point.

the VE of that motor becomes MUCH greater in that rev section due to the cam change over.

VARY few engines do such a thing.

the larger turbine would require more shaft inertia to "come up" thus requiring more energy, while i agree with the trim note, the larger size turbine wouldn't benefit here.

i'd much rather see a 4-4.5mm bump in compressor wheel size for air flow Vs a 6mm jump in turbine size for efficiency. (those are just common size jumps from where they are now)

also, a lager comp wheel could be attached to the 28r CHRA shaft, if you bump the size of the turbine / the motor of the turbo i'd bet shaft size would have to jump to sustain the rotational forces that this larger turbine would generate.

This would require even more energy. not only from the larger shaft, but from the larger barring race's (sp?) as well.

if i missed something here, please let me know, you seem educated on the topic and I'm always game to pick things up.

yea, thats just what they need now....

ugh.

 

We shouln't jack this fella's thread, but if you want to move it to a new one I always love talking turbo tech.

 

This is very promising. Still, I'd like to see it spool sooner.

 

good call.

my bad OP.

 

Nice numbers guys.

 

any updates with some more rpm.

 

So for the torque to go up some are you going to have to change out the camshaft?

 

no no no.

Just like I was saying before, tweak out the cam timeing in a specific mannor and u can spool a large turbo vary quickly.

Vvt and turbos go hand-in-hand.

I went over the basics of what to do in a preveious post.

If these guys keep it up, they will have THE kit to buy, simply because tweaking the cam timeing ontop of proper ign adv and fuel will give them set ups that make more power and respond quicker then the guys who sell a kit with a tune that's not optimized.

Kudo's to synapse once again!!!

Like I said before, can phase, cam phase, cam phase!!

 

I have not yet tuned this car, this was tuned by their in-house tuner up to this point.

No it doesn't appear to fall on it's face. Torque falls off after 5,250 on almost all cars because of the formula used to calculate hp etc. It was still making power up to the top of the chart.

 

LOL


Ehhh Neeoope. Torque drops... Because the intake mach number starts to get much too high. "runs out of breath"

 

Torque always drops at 5250.... Has nothing to do with the turbo.

 

Torque does not have to fall past 5250. HP and torque will always cross at this number. It does NOT mean it will fall.