My rev-limiter is currently set at 6600rpm and the nitrous cut-off point is set at 6000rpm. I plan on changing it to 6200rpm, so I can use it as an indicator (similar to shiftlight) to shift gear right after the nitrous cut-off.

Is 6200rpm a little too high for the motor to be on the gas? Has anyone been running nitrous over 6200rpm before? Any problems?

Thanks
-Tuan

 

If the motor is stock I would watch how high you set the rev-limiter because of the valvetrain, you may end up with valve float and possibly bent push rods.
I would keep the nitrous cut-off at least 2000 RPM's below the rev-limiter, you should be ok with the cut-off set at 6100-6200 RPM's, and the rev-limiter set at 6400 RPM's.

 

i have my shift light set at 6300 and my cut off at 6200 it works well. i also have a cam and chromaly pushrods. i don't know if you have a similar setup

 

Harlan built me a window switch with a shift light on it as well. When the window is over the light comes on. The only thing is I might be losing a little bit of ET as the N20 turns off the same time the shiftlight comes on. Just makes me want to shift right when that red light flashes.

I have total stock internals and have it set for 5800 right now. I'm thinking of moving it up to 5900 or even 6k.. Our stock limiter is what, 6150 or 6050??

 

Sorry, I forgot to mention that I have the MTI T1 cam plus their valvetrain upgrade package.

 

With the T1 I'd keep the rev-limiter at 6600 and set the window to cut-off at 6400, that should work well and keep things on the safe side.

 

I plan on using the 3200-6400 pills, my rev limiter is at 7000...I have stock heads, but a cam with all the valvetrain goodies...

My friend was telling me it was better to shift like at 6000 even if I usually shift at 6500 on motor... <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

 

Yes, oftentimes shiftpoints are lower on the bottle than off. You can physically get more nitrous into a cylinder at a lower rpm.

J.

 

I spray mine to 6500rpm and run it up to 7000rpm without any problem.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Crazyquik:
<strong>You can physically get more nitrous into a cylinder at a lower rpm.

J.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">How so? Can you explain a little more on this?

Thanks
-Tuan

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Tuan Le:
<strong> </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Crazyquik:
<strong>You can physically get more nitrous into a cylinder at a lower rpm.

J.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">How so? Can you explain a little more on this?

Thanks
-Tuan</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Thats right but the way he said it may be a little misleading. Its not that you can get more in ( the displacement is the same) but that the flow rate of nitrous remains the same regardless of engine RPM. If you spray a 150 shot at 6000 rpm, that 150 shot is dispersed over twice as many cylinder events as it would at 3000. Or in other words on a 150 shot you would get twice as much nitrous/fuel in the cylinders during each intake cycle at 3000 rpm than at 6000 rpm. Thats why you see massive Tq at very low RPM. Thats also another good reason to run a progressive contoller with a big shot. To control the hit at lower rpm and feed the motor more at higher rpm so it is more of a natural curve of power.

<small>[ May 07, 2002, 01:37 AM: Message edited by: 383LQ4SS ]</small>

 

Well put 383lq4ss very nice explaination. I have stock internals and shift on hp at 6100 on the bottle 5900 or 5800 short shift it and feel it pull you back in the seat. My 2000 sss is an a4 car It sounds like yours is stick.