Redline

[LostSolVTEC]

Why does the B16A3 redline at 8250 and the A2 redline at 8000?

[Slow_3Door]

because honda said so...

[boostedb16a3]

Originally posted by LostSolVTEC
Why does the B16A3 redline at 8250 and the A2 redline at 8000?

because the del sol vtec is superior to the civic si!y: The si revs a little higher than 8k. at least my friends does. he has bolt ons with a vafc and we logged it on the vafc it went 8100 or 8200. whatever though, del sol vtecs are better

[del-s2k-Sol]

I believe it has to do with the OBD computer. The OBD2 computer, which was introduced with the b16a2, is more emissions restrictive then the OBD1 computer, which may have something to do with less redline. Both engines have the same compression, hp and torque. Just different computers.

The 94-95 VTEC's have a b16a3 with a OBD 1 computer.

The 96-97 VTEC's have a b16a2 with a OBD 2 computer (same engine/computer that is in the 99/00 Civic Si).

[LostSolVTEC]

which one would u guys rather have then?

[mugenrsx]

Wouldn't a b16a3 make respond better to mods because it is obd-1?

[VTEC Dave]

Originally posted by mugenrsx
Wouldn't a b16a3 make respond better to mods because it is obd-1?

No that's a myth. You can mod an OBD II just as easy as an OBD I. The only thing is the OBD II has more emissions restrctions. In some cases OBD II vehicles are better to mod. You can hook up a scan tool if you got any problems and know right away what it is.

[Dark_Sol]

But wouldnt more emissions equal more restriction, thus less HP?

[Hater]

It's not even that the emissions are 'restricted' so to speak, it's just that there are more sensors watching more things that require more work to bypass, and the air/fuel map is more complex and efficient.

OBD2 isn't worse for your car than OBD1. If it was, it never would have made it to the streets. It's just more efficient, and more precise, so it's harder to tune to get more power out of it, because it's specifications are so in tune with each other.

OBD1 is easy because it's a relatively simple ratio of air to fuel to spark to RPM to vehicle speed. OBD2 factors all that differently and calculates it more exact. I would stick with an OBD2 motor for it's newness, and jump it to OBD1 for the ability to tune it at will.

And to answer your initial question, both OBD1 and OBD2 redline at the same actual 8200 redline, but the gauges will display different depending on the year/make/model of Civic/del Sol with a B16.

The 200 RPM won't make much difference anyhow, as you should be shifting before 8000 to have an efficient run regardless of redline. The only reason to up it or worry about it is built engines with superior valve-train, bottom-end, and transaxle components that can withstand the pressures and rotations of that many RPMs.