Joe_Dezod

On the kits we have access to selling, no. But you could try emailing scion speed direct and asking them if they'd substitute the emanage with the ultimate for a credit towards it. Worth a shot.

Joe_Dezod

They had extensive mods done to that motor, not just springs. It's running a BCE head with a REV valve train system. The motor is also fully sleeved with lightwieght pistons. The head helps for this, and the stainless springs withstand the higher heat and rpms. The Motec stand-alone helps to rev cleanly as well.


Now you're talking about a V8. Not an In-line 4 cylinder. 4-cylinder motors with larger stroke tend to not rev as high. V8s are a little bit more stible, given their configuration. I don't want to talk about V8s because I'm not as familiar with them. But search around stock cars and you won't find a 2.4L 4 banger that revs that high. If it would work on a safe, daily driven level, then it'd be out there.

That I completely agree with. The only time I'd rev that high is in 3rd at the track. But I'd be scared to do it on a consistant basis.

I don't want to come off attacking anyone, especially another company. I just wanted to back up why I said what I said earlier so we don't look stupid. I'm very familiar with heads and 4 cylinders so I stand by what I say. I'm glad someone tackled the project of higher revs on a stock valve train. Kudos to you for the innovation and attempt to take this motor farther. I have respect for that. Good luck with everything.

Marshall

Props

OuterHeaven

the problem with comparing the LS1 with our engine (2az-fe) is that the LS1 has a 92mm stroke for each piston while we have a 96mm stroke. since our pistons have to travel a further distance in one cycle in the combustion process, our pistons are actually moving at a faster velocity as they go up and down compared to the LS1 engine. this is why each only goes to 6200 RPM and the sheer fact that it might be possible to hit 7000 rpm on our motors is that much more harder then the 5.7l LS1 engines because our piston speed is not only faster but will increase faster as the RPM's rise. Since people have actually logged times when they have miss shifted and logged 8000+ rpm for a brief moment of time, i believe our engines should reach about 7000 rpm safely. they might be right that our heads need some modification (porting, cams, valve springs, retainers, ect) but untill someone really does it, no one will really know. Good luck to anyone attempting this.

matty-tC

if you want an engine to do consistent 8krpm pulls, why not build the engine up to handle that and boost?

i'd love to see some short/longblocks with a BETTER TRANSMISSION SETUP (more gears, gearing, etc.)

Joe_Dezod

Jotech tried the rpm options but ditched it fast. The problems is that the torque to HP distance was much greater. Sure the top end was fun, but it didn't throw you in the seat as much.

Also... Keep in mind, especially in boost, when you rev higher you need a lot more fuel. The stock rail can support no more than 720CC injectors, but only up to 5800rpms if you max out the motor (28psi on a sleeved motor). Yes I'm pulling that info from Jotech but think about it... If you decide you want to rev to 7.5K at only 10psi, those 440cc injectors may not be adequate enough to supply the fuel. So you lose even more fuel efficiency at lower rpms, but without being able to make more torque, just HP. Granted the extra HP will be faster than the same car redlining sooner, it's not as efficient and the risk of damage is greater.

If we had longer gears it'd be much better. The stage 0 and 1 mopar SRTs rev to about 6200 and they can get up to about 145-160. Talk about long gears. The 4th gear on those things can do up to 130 on a stage 2 (chipped to go to 6800rpms).

matty-tC

what do you think about a FPR? I haven't read too much about the OEM fuel setup on this car

Joe_Dezod

stock we have an FPR... better ones obviously help but aren't completely neccessary on most street setups

matty-tC

ok so there's no need as far as running about 1 bar or so? what size injectors are you guys doing for your 1 bar kit?