Nitrous Altitude Adjustment

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71 Nova · #1 Post by **71 Nova** » Mon Mar 12, 2007 9:21 pm

I was gonna go to Famosa Raceway this weekend in Bakersfield, CA but they're closed, can you believe it? So I am thinking of going to LA County Raceway instead. Famosa is at around 600 ft above MSL while LACR is at 2750 ft above MSL. My question is: does a nitrous system need to be compensated for the difference in altitude? My Nova has been dyno tuned and run at 400-600 ft...
Thanks, Ken

#2 Post by **John_Heard** » Tue Mar 13, 2007 8:12 am

With the worse air you may need to take a little fuel out of it. Wouldn't hurt to make a pass and get a plug reading and see where you're at first.

Racer704 · #3 Post by **Racer704** » Tue Mar 13, 2007 5:45 pm

One other thing is what the weather will be also.As John said make a pass and read the plugs and go from there. One more thing put in a new set first.

71 Nova · #4 Post by **71 Nova** » Wed Mar 21, 2007 9:50 pm

Thanks, guys. Gonna try it at LA County Raceway this Saturday. Will report back on Sunday...

Racer704 · #5 Post by **Racer704** » Wed Mar 21, 2007 11:13 pm

Dont drive back on those plugs either if you can tow back so you can get a clean reading

Mike Peters · #6 Post by **Mike Peters** » Thu Mar 22, 2007 7:40 am

Racer704 wrote:Dont drive back on those plugs either if you can tow back so you can get a clean reading

Hey Johnny..........since the top trans builders recommend not "neutraling" the trans which would also prevent clicking the engine off immediately, maybe you'd share your procedure to get the best plug readings after a pass.

Racer704 · #7 Post by **Racer704** » Thu Mar 22, 2007 7:58 am

This is my shut down procedure, as I come to the finish line I drop my laundry at the first set of lights then move my hand to my ignition switch and as I cross the finish line I shut the car off and at the same time I clutch the engine and then kick my shifters forward on the Lenco.Then tow back to the pits.

You can still do this same deal by leaving your trans in gear, shutting it off while in gear shouldnt harm anything and coast to a stop. I would call your trans builder and ask him though to be on the safe side.

I hope this is helpfull

Mike Peters · #8 Post by **Mike Peters** » Thu Mar 22, 2007 8:06 am

Ahhhhh, I forgot you run a Lenco Johnny.

My bad.

Racer704 · #9 Post by **Racer704** » Thu Mar 22, 2007 8:08 am

No big deal but you should still be able to shut your car off with no problem.As I stated just leave it in gear Bro

#10 Post by **John_Heard** » Thu Mar 22, 2007 9:09 am

Mike's got a good point. Putting a TH400/TH350 into neutral can make the tranny explode BAD DEAL. Do not do that unless your transmission builder has told you he's made some kind of mod that will allow that.

Stephen Griner has the ability I"m not sure if other builders have a way of doing it. One indication is that the transmission will have more than one neutral gate on the shifter but do not assume anything without talking to them. I'm not sure about glides, they may have the same issue.

If you don't have a way to tow back to the pits take an extra plug or two with you on the pass along with your wrench and some gloves and pull one or two before coming back on the return road. Many tracks have an area on the return road where you can pull off, just make your pass and then pull over there and then swap a plug or two out and drive back to the pits. At least you'll have one or two clean plugs that didn't get colored in idling around.

If you can't do that, for example say the track has no place to pull over, Drive it back yank the plugs and spray the soot off of them with brake cleaner. That will still give you a pretty good idea but they are harder to read than shutting it off clean.

Mike Peters · #11 Post by **Mike Peters** » Thu Mar 22, 2007 10:03 am

Good advice John. Not sure about neutraling 'Glides. Hutch definitely says not to neutral his Glides either as well as his TH400's. What about Johnny's idea of leaving it in gear? I can't think of any problems with clicking it off while it's in gear unless you do something to the internals if the front pump isn't being driven? Anyone else?

#12 Post by **John_Heard** » Thu Mar 22, 2007 10:26 am

Nothing wrong with leaving it in gear with the motor running or not. But don't downshift it till you get slowed down like when you're coming back down the return road.

Racer704 · #13 Post by **Racer704** » Thu Mar 22, 2007 4:23 pm

Well I guess it lost something in translation but as I stated above just shut the engine down, by that i mean leave it in gear. Only go to N after you have talked to your trans builder.

79 Camaro · #14 Post by **79 Camaro** » Thu Mar 22, 2007 6:09 pm

The guy that put my TH400 together said to leave it in high gear until you come to a complete stop. I have a reverse valve body so I couldnt get to nuetral without going through 2-1 gears again, which again I was told not to do that while in motion. Now the only problem i have with pulling to the side on the return road is that my stupid hood is a bolt on and you pretty much need two people to get it off... HAHA!! I am sure my dad will meet me down at the end for some assitance

But I cant wait til i get to try the spray out, I hope it wakes my pile up!!

Adam

71 Nova · #15 Post by **71 Nova** » Thu Mar 22, 2007 9:14 pm

OK, so shifting into neutral at the top end is bad, even going from 3 to neutral (I don't have the reverse pattern)? Didn't know that. I don't have a ignition kill switch (just the key switch which has the column lock, definitly not good). So I will have to coast down with the engine running and stop on the return road (if I can). Sound good?

Going to LACR Saturday, everything's falling into place so far!

As always, thanks guys!
Ken

Nitrous Altitude Adjustment

Nitrous Altitude Adjustment

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