Any of you FI guys, that have ran FI on a daily basis. I was wondering how much boost you guys ran (the highest) for daily driving. I have a good amount of fuel coming in now, so I am going to turn the boost up a little. I am thinking about 8.5-9psi.

 

Are you going upgrade internals? Why exactly are you uping the boost? Are you uping it to see what breaks or just for more HP and fun?

 

Um...I will say a little bit of all of the above. haha. Yeah, its mainly for fun, but it still needs more power. Id like to get the XB into the 13s when I go to the track. Ive been searching online for a used 1nzfe. Id like to send it to my machinist to see if the block can be bored/sleeved, etc. I think I will go from there. Hows your car doing? Any updates?

 

See you and I are one in the same, both shooting for the same thing with our xB's, we just dont see eye to eye on a certain company. But that wont hold us back from our aspirations and goals. I think you could bore it out abit, not much thou. Sleeving it would be awsome, ive read that some sleeves can handle up to 70PSI. My car will be back up and running this week and is getting a bigger exhaust put on, then we will dyno and go from there. So it is all good, next is engine rebuild and tranny overhaul. WoooHaaa

 

I cant argue that. We dont see eye to eye on a certain company but I am sure that the reasons why I dont see things your way, you would agree with. Youre just in a different situation than I am because I am not at their mercy.
I have been talking to some of my contacts in Japan to see what has been done with the 1nzFE, but not getting much info. If I can increase this little guy to 1.7liter sleeved, Ill be really happy.

 

Rollhard, I thought about more boost too, but I guess right now, I'm satisfied with the car's performance at 6-7psi, I'm not much for going to a track or racing the car, just want a little more fun in driving it. Granted, buying a boost controller and increasing the boost would make it even more fun, but I just don't want to spend anymore money on this setup. Incidentally, with 6-7 psi, I need to watch how I accelerate in 1st because if I push it all the way, the tires start losing traction (I'm not talking about the launch, I can get that pretty much down without burning rubber). Especially when I'm turning onto one of the busy highways here. It's funny, before the clutch couldn't handle it, but now that I have the performance clutch, the tires can't handle it! Of course the other gears are fine! ;)

p.s. I'm preacherboy on clubxb

 

Yeah launching is ok, but with 100% throttle after 5k rpm the tires break loose. I have new wheels and better tires on its way so, Im just prepping everything. I have Tein coilovers and wilwood big brake upgrade coming also.

 

I was looking at this route and I talked to a guy at Scion and he said that boring/sleeving and changing the displacement on the engine would really be pushing it and take it past it's stress tolerances. From my reading the 1.5 is really a 1.3 milled to 1.5 displacement... be careful... or just go for the celica swap and boost the damned thing

 

You'll need drag bars, a cage, tub, and a 19point harness for that rocket pretty soon...

 

Here are the three NZ engines that Toyota uses.


1NZ-FXE
The 1NZ-FXE is the earliest 1.5 L (1496 cc) version built in Japan. Bore is 75 mm and stroke is 84.7 mm. It features forged steel connecting rods and a plastic composite intake manifold. The engine has a high physical compression ratio of 13.0:1, but the inlet valve closing is retarded. The net result is that the engine has a greater effective expansion than compression – making it Atkinson cycle, rather than the conventional Otto cycle.

The reduction in cylinder charge means reduced torque and power output, but efficiency is increased. This combination makes the 1NZ-FXE suitable for use with the Hybrid Synergy Drive, where peak torque and power demands can be met by the electric motor and battery. Output is 76 hp (57 kW) at 5000 RPM with 85 ft·lbf (115 N·m) of torque at 4000 RPM.

Applications:

Toyota Prius

1NZ-FE
The 1NZ-FE is a conventional Otto cycle variant of the 1NZ-FXE. It has the same bore and stroke, but the compression ratio is lowered to 10.5:1, and it features VVT-i. Output is 107 hp (80 kW) at 6000 RPM with 103 ft·lbf (140 N·m) of torque at 4200 RPM.

Applications:

Toyota Yaris/Echo
Scion xA
Scion xB
Toyota Vios

2NZ-FE
The 2NZ-FE is a 1.3 L (1298 cc) version built in Japan. Bore is 75 mm and stroke is 73.5 mm, with a compression ratio of 10.5:1. Output is 85 hp (63 kW) at 6000 RPM with 89 ft·lbf (121 N·m) of torque at 4400 RPM. The 2NZ-FE's that come in the Yaris sedan don't come equiped with VVT-i, but the ones in the Yaris Hatchback do. The VVT-i does not change the horsepower output, but rather alters with the valve timing according to driving conditions.

Applications:

Toyota Yaris/Echo/Vitz
Toyota Vios