Si2k

That graph is exactly what happens when you hit choke, this is when you hit maximum airflow through the engine, anything less than this is an engine that's not getting enough air in

Engines tend to be stress rated in terms of Torque though as this is load. Power is purely a function of this and power indicates the heat management required.

Torque = BMEP. Excessive BMEP will break piston ring lands, bend rods, blow headgaskets, lift cylinder heads and put bigger loads on engine bearings.

Increasing Power = Bigger radiators

Si2k

The wastegate stops this though as it limits boost and therefore airflow at 4500rpm. At 9000rpm you could run with the wastegate open.

A wise man once told me : sometimes it's best to think how engines work without thinking about engines.


Great thread though, Nick - what do you think about the S2000 chassis in general. I have noticed the hand welding before, I guess this was purely to increase stiffness.

Love the subframe bracing on the other car too.

MB

That would be inefficient though, and would imply you hadn't sized your turbo correctly imo.

Si2k

Correct for the real world, but I was just stating the reason why you wouldn't make the same power at 4500rpm as at 9000rpm.

I once went out in a car with 3000 at 4000rpm but it held it till 6750rpm. Massive work done under that power curve!

seano

Nice work/post Ben - I shall follow this closely. Its good that there will be a 3 ROTREX Honda in TimeAttack although we have our engines turned round the wrong way and drive the wrong wheels.

Its funny that the same arguments and slight misconceptions reign on here as the EP3 forums of NA vs Turbo vs Supercharged (although they are very politely expressed on here).

Couple of observations if I may be so bold on a first post.

Its probably best to think of forced induction output in terms of volume (CFM) rather than boost.

I love driving NA versions of these Honda engines - its a fantastic and rewarding experience for an enthusuatic driver to work these engines, revs and gears properly.

For FI personally I prefer supercharged over turbo for road/track work - I just think a charger compliments the rev range characteristics of the Honda to make it hugely driveable. That said I concede turbos can and do make huge numbers and are good on 1/4 mile.

Seano

MB

I agree about the SC.

I think we all dram of a 350 bhp NA S2000, but sadly it's just not possible. You can see why HEL have gone SC, and I don't blame them or think it's that bad. I think we are all just pining for a tasty NA build on the forums. Might go remove the turbo from mine and buy one of those J's racing 300 bhp engines

Ultra_Nexus

That is why I have said it is theoretical. Perhaps I should have said hypothetical.

A million factors I excluded, I was just trying to show the ultimate impossible target.

gt750boy

STOP!!!!!!!!!!!

Please stop the thread hijack debating the how's and wherefore's about turbos. Go to another thread to discuss.

Can we please getback on topic about HEL's interesting build.

PLEASE!?!?!?!

martin j

veehexx

i look forward to more worklogs from you HEL Performance. pictures are good