ZONES89RS

iTrader: (25)

Never used one before, but when i install it on the trtans am, i assume 3500-7000 should be a good window and having it read off the same wire that the tach reads off of is not an issue, any instight? rev limiter will be 71 or 7200 on the 5.3.

Quick Sh0t xMLx

The limits sound right.

Iroc-z_23

just so you know, and not that it will make a huge difference (unlike pro mods) but msd starts mixing cylinders 700 rpm before actual rev limit. set it atleast 700 rpms above your shift point in my opinion

ZONES89RS

iTrader: (25)

Is that a fact or personal experience? Never heard of it before, i am using a MSD 6010 ignition controller for the carbed application, so they would both be off 700 RP< then or just the ignition controller? I know my tach os about 2-300 RPM too slow and doesnt keep up witht he engine since it is the cheap 125$ tach.

1lejohn

iTrader: (9)

I'm using the MSD 8969 digital switch it cuts off right on the rpm that I have it set to. I had to run mine on the 4 cyl. mode to get it to read the LS tach signal. You can watch it read out at lower rpms and see if it matches the tach. Mine does. (mounted in the glove box). I connected a light to the n2o relay coil that is on during the window of operation and then cuts off when the Msd cuts out. That way I know that the n2o should be off.

kyhunter89

IM guessing M6 ?

Iroc-z_23

It's both a fact and personal experience, but unless your getting air fuel readings from each cylinder idk if you can pin point it. The local pro mod guys that use race-pak told us about it and even called msd and thats what they said. Everything else should be fine I would just bump your rev limiter up

ZONES89RS

iTrader: (25)

I have the same window switch, i guess i will test it myself when it goes on the car. But i am running a carb, not EFI so it will read the 8 cyl output.

So you are saying that the ignition controller reads 700 RPM slow as well or just the wondow switch? Not trying to have a back fire and i would notic nitrous shutting off 700 RPM early.

Chris@NitroDaves

We have sold many of the MSD units and installed them here at the shop and we have always set it to where it cuts off 100 to 200rpms before shifting [ Ex. 3000 Activation to 6200 deactivation { shift would be at 6400rpms } ]. I've personally never hurd anything about the window switch mixing cylinders or any problem of that nature but i could be mistaken. I've never seen it happen.

ZONES89RS

iTrader: (25)

What I figured.

Iroc-z_23

Your missing my statement completely. I'm not talking about your window switch. I'm talking about your rev limiter being set close enough to your SHIFT point.. And so if you were to take readings of air/fuel ratio from each you would see that a few cylinders may be more rich or more lean, but not by huge amounts. It doesn't start activating your rev limiter early. There's no reason to have your rev limiter set that close to your shift point anyways. It's to protect your rotating assembly from hitting unsafe rpm's. If you plan on racing at the strip you'd hit rev limiter I'm sure just from missing a shift point

Iroc-z_23

And it could be just certain types of msd boxes also. Just a heads up.

ZONES89RS

iTrader: (25)

Well, i will set it a given 1000 RPM window and test it when i get the car together, i have to drop the trans to send the converter back so it will be a little while.

Iroc-z_23

do you have any controllers in your thirdgen? if so where do you have them mounted? ive got so much wiring going on with this nitrous set up and its starting to look like a fuel injection wiring nest