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Discussion in 'Gen 2 Prius Accessories & Modifications' started by Escalade_on_22s, Apr 5, 2006.
THAT would be interesting....
for the gen 2 Prius
Range 5 looks "good" - the engine doesn't seem under heavy load - (RPMs) aren't always "high" cruising 70mph.. I'm guessing the RED is the overlap?
Pardon my ignorance, but how could one tune an intake to +70mph with the picture you attached. I honestly don't know much about cams duration and such...
Firstly, I am not confident one can 'tune' an intake runner on a Atkinson engine, there will be reversion in the runner due to the late intake closing, rather than a sharp wave at closing in an Otto cycle.
HowStuffWorks "How do tuned intake runners work on your car?"
On a 4 stroke engine the crank revolves twice for every power stroke so I am not convinced the red area is overlap, I think it is the small area at the very top, where the exhaust is closing but the intake is opening. Load 3 and 4 seem to have overlap.
This is a random Otto cycle camshaft with overlap labeled.
sooo... what if I was converting my Atkinson over to Otto cycle...and looking to create my own custom intake manifold...with long tube runners and a aluminum plenum... what then?
Then it is easy, lots of work has already been done on the Echo/Yaris engine, which is the Otto cycle version of the Gen 2 engine. I bet Yaris tuning is common.
07-up Toyota Yaris Parts at Andy's Auto Sport
Toyota Vitz RS 1.5 ‘07 - GT5 Tuning 215 HP
The thing is, I haven't found any info on how one could one tune an intake to +70mph...
You actually tune to an engine RPM, another problem with the Prius, 70 MPH is not a set RPM
Whatever happened to this thread? I would say start with a super small shot of nitrous and see what happens. A 10hp boost probably wouldn't risk hurting the engine....
i got to wonder at what temp nos will ignite. i don't know how hot the air/fuel mix in the intake is, but if its hot enough to light off the nos/fuel mix = boom!
At automotive temperatures and pressures, N2O will not itself ignite, it adds oxygen so you can burn more fuel.
Nitrous oxide engine - Wikipedia, the free encyclopedia
Because the Atkinson cycle pushes the fuel/air mix back into the intake, it is inherently a 'wet' system.
i know what nos does. at what temp does the mix ignite is question 1. how hot does the intake mix get is question 2. if the 2 are far apart it might work.
also, the jolt of a nos shot will most likely break traction. so i'm thinkin a turbo might be a better choice. either way, its already easy to break traction, and then the damn thing cuts all power to the wheels for much too long. i'm hoping to get some lightweight 16" wheels and lrr 215 tires at some point, and hopefully they will stay hooked up.
NOS gets hot enough to melt your entire top end. NOS increases oxygen by over 300% and if you don't have enough fuel to keep the mixtures proper, you have what's tantamount to a blowtorch. I would never put nitrous on a Synergy drive. After I rebuilt the melted top end of my speedster I had to beef up the clutch so it could hang on. The little Synergy Drive is not designed to handle that much power from the ice.
I think it would be possible if you addressed the reversion issues with our motor, the 1nz-fxe atkin motor recycles burnt air and fuel by pushing some of it back into the intake to be re-burnt. You don't have to be a rocket scientist to figure out what would happen if you introduced nitro to this equation. If you installed a regrind camshaft theoretically it should be. No different than adding nitro to a stock civic, the short answer is yes it would work as long as you use a modest amount of it.
You would probably get more power out of lighter engine internals like light crankshaft, con rods, pistons, iron sleeved block bored out an extra 2 or 3 mm to make the displacement 1.6L, and of course reground crankshaft.
you would be looking at about $10,000 in parts and labor, which is cheaper than using nos and having to replace your engine after you blow it up.
oh and if you did not fix the reversion and just nos'd it. Combining the extra heat in the cylinder which is caused by reversion as well as the extra heat created by the lean fuel mixture which our cars run on to save fuel. The nos would surely weld the piston to the cylinder wall.
none of that answered the questions. what is the flash point of nos/fuel mix vs. intake manifold temps.
yeah nos can melt a piston, it can also break a main cap and wreck the bottom end too if it pre-ignites. and if it lit off in your intake you'd be on the side of the road, on fire or both.
by the way exhaust isn't pushed back into the intake, the intake valve hangs open during early compression stroke. its unburnt air/fuel mix going back into the intake. but how hot is it?
i do not sea a reason a wet shot of nox would not work. just do not overdo it. start with 20HP or so. that will be plenty.
the prius engine is not some mythical on the edge of braking engine. the reversion into the intake makes no difference to the mix compared to being fed via the intake plenum in first place anyhow. ok, it is a few milliseconds older.
the same none aktins engine has 20HP more running the same bottom end minus the high CR pistions. why should it break adding those 30HP back, does make no sense to me.
the lambda regulation on the prius is in closed loop all the time. it runs lambda 1. add extra oxygen from whatever source and it adds fuel by itself. it is not a lean running engine like the first gen Honda insights. emission standards do not allow this anymore.
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Question to OP is the Gen2 Prius in the following YouTube Channel
If so and if that is the current True set of factoids.
I being one individual (who has made some poor choices/decisions) with a Gen 2 Prius ….I have to go doctor Phil on you and ask the following
WHAT WHERE YOU THINKING?
WHAT IN THE WORLD GAVE RATIONAL THOUGHT TO THIS SERIES OF MISTEPS?
I was wanting to post the NOS video for some time
Install NOS, press the button. The traction control activates when the wheel slips. The motors disconnect, the engine massively over-revs, and game over. Interestingly, Hoovie’s transaxle survived so MG1 must be pretty tough for brief over speed!
Basically, performance upgrades are not really possible. Until the ECUs can be modded. Increased aero mods and weight reduction would work. Or get a rear diff and attach a motor to that for short bursts of power?