car falling on its face on launch 125 shot?

[hdmlnium1]

Went to the track last night to run my 125 plate kit. The car would nose down after launch for about a second then lift back up and seem to pull good after that.
Best pass was a 11.6 at 121.53 mph
Im thinking i need to add a purge kit to get fresh nitrous at the plate.
I have the nitrous armed at full throttle and set for 3000 to 7700 RPM'S
Does that sound like my issue?
Thanks, Bill

 

[CPRsm]

Yeah that can be a fix for sure. Liquid nitrous works much better!!

 

[CharlieR]

I'm going to guess it's a standard trans on a sticky tire? I'm gonna say your RPM's are falling below the 3k threshold when the clutch releases and the tires hook. I've never had a noticeable "bog" from not having liquid at the noid(never had a "big kit" usually 175 or less). Leave harder.

 

[cb900f]

What kit is it? Is the WOT going off the TPS sensor?

 

[hdmlnium1]

It's a nitrous express plate kit.. yes the wot is going off a tps
Ok I will leave harder next time and see if that fixes it..
and yes M6 trans 373 gears and Nitto NT05R 315/35/20'S
Bill

 

[cb900f]

Buddy of mine had issues with the NX WOT switch and had to swap to a micro switch.

 

[stroked mach]

I think it is bogging and the rpms are falling can u record it with a phone or gopro to see what the rpms are doing

 

[hdmlnium1]

Yep I can do that. It's raining here today so after it dries up in the next few days I'll try that..
Thanks for all the replies..
Bill

 

[hdmlnium1]

Buddy of mine had issues with the NX WOT switch and had to swap to a micro switch.

I'm not using the nx tps. I'm using a NOS window switch that has a built in tps as well..

 

[Tuffnuts23]

I would say leave harder too. I had my 2 step set at 3k and my window switch set to 3500. The car fell on it's face. I bumped up the 2 step to 4000 and turned the kit on at 4500 with much better results. I should add that this is on a bias ply slick at 12psi cold

 

[Sick_Mustang]

I would activate the nitrous at 3500. Launch harder. Personally I would use a microswitch on the pedal.

I also would not be trying this on a low profile radial tire in an m6, something it bound to grenade here shortly.