advice on turning no2 on against transbrake

[brothern2o]

Dumb question how long do you turn the nitrous on against the transbrake. Is there a real benefit to doing this. Just want to know as a pro tree should let you go, once both cars are fully staged, 1-1.125 seconds but I have always turned on spray after trans brake button was released. Thanks for any help. John

[2 bottles]

I dont know anyone that actually has the system spraying while on the transbrake. Most people use a double throw relay that allows you to arm the nitrous and put it on the brake and give it full throttle without the nitrous actually spraying. When you let go of the trans brake button it will close the circuit and send ground to the nitrous which turns it on immediately after button release. Thats the way mine has always been. NX and other companies have the wiring diagram for this. Its not that difficult, it just sounds like a pain in the ass. I hope that is what you were looking for. Good luck, Clint

[brothern2o]

that is how my nitrous is setup now. heard a urban legend of turning on nitrous against converter for a split second adn picking up a tenth or two in the eigth. thanks john

[czaker]

if the urban legend ends with engine damage it may be true:D as far as i know you never want to spay nitrous while against a rev limiter. something about loading a cylinder with fuel and nitrous and only firing it evey other cycle. sounds like the making of some pretty good back fires.

[brothern2o]

no rev limiter just trun it on and converter holds it back suppose my motor makes 1100 on spray is that any different than a blown motor that makes the same hp and just leaves by matting it and leaving against converter. back a couple years ago they used to say a nitrous system is operating a full effciency 2.5-3.0 second into a run that is why turning a system on asap is so crucial. But you are right rev limiters on a nitrous cars can defianately be a bad thing that is why I generally don't set mine.

[Project-roc]

I see what bothern is saying....makes sense, but I don't know if I would try it or not. Say your convertor will only hold up to 4k, lay on the brake and watch the tree drop - hit the juice at the 2nd to last light ( sportsman tree ) It would probably allow a 5k launch I would guess?

[brothern2o]

ptc tells me my converter goes 3800 or so on motor and 5600 on juice does that mean i an turn it on against it? i guess i should call and find out.

[2 bottles]

No you that doesn't mean to turn it on against it. In fact I bet they wont like to hear that you are considering doing it:eek: . It means that when the transbreak is released and the nitrous comes on the converter will flash to 5600 rpm. If you were to launch it on motor than it would only flash to 3800 and probably leave like a pig. Your rpms on the converter sound just right. Let the nitrous come on with the t-brake release like you have it. If the car is not leaving like it should or the 60 ft is off I would say the problem is elsewhere. Put the car on the brake and against the converter with no chip and if it goes to 3700-3900 like they said it would on motor than I would say it is pretty much right on. I am no converter guy just my opinion. My settup was in the exact rpm range you are talking and I always had the nitrous come on with the release and have been a 1.28 60ft on a 26x 8.5 @3200.

[brothern2o]

thanks 2 bottles, last year with an old 8in and even older motor car went an easy 9.20 and went 1.30 on a set of 5 year old 28-10.50 I guess I will leave well enough alone and see what the new converter and motor are able to do for me this year.

BTW-is your car a stock susp. car? if so what springs are your running? I currently have 175 coil overs in front and stock v8 springs outback.

thanks again - john

[SwillRacer]

We tried spraying on the brake back before we switched from nitrous to a blower. We talked to Dynamic/TCT first and they said to go for it. We turned off the rev. limiter and let it hit the brake. I remember sitting there being amazed at how fast it came up on the brake. It didn't help our ET or hurt any motor parts that I recall. The added starting line power may have caused wheel spin and that's why it didn't pick us up. It was like 3 or 4 years ago in at the columbus race so I can't remember all the details. I do know we only tried it once or twice. I'm still not sure if it's a good idea. I am 100% sure that nitrous and Rev Limiters do not like eachother.

[2 bottles]

I run the 175's up front w/strange struts and afco coilovers in back. If you have been 1.30 with 5 year old tires then I say spray on with some new tires:D on "GOOD" track and hold on.:eek: I think high !.20's is the best you are gonna get out of a high 8 sec. or low 9 sec. car. Being that its not a ladder barred hot street car.

[brothern2o]

thanks guys, was told to put 130's up front but car barely lifts the front tires now but I would like to lower ride hieght like when I had 4cyl springs up front and southsides outback. thanks john

btw-just a stock susp., with powerglide, some nitrous, and some new slicks this year...can't wait hoping for at least high eights

[Maliboost]

Plenty of folks do it, but you need to have top shelf converter & trans parts. & if you hit the rev limiter, head to the stands to get your carb.

Bob

[brothern2o]

what is the gain in leaving with spray on

[quick coupe]

back a couple years ago they used to say a nitrous system is operating a full effciency 2.5-3.0 second into a run thats absurd.


i had a friend with a big tire car (that could actually lay down the power) that tried this and it damn near broke the wheelie bars off the car it left so hard. mid 8sec car spraying around 300. imagine the light you could cut off a pro tree doign this:D

[memphis306]

not only have i heard that billy glidden did this when he ran an auto but i have a friend who sprays his turbo'd car on the brake to help spool up.

[brothern2o]

it is interesting to here how people get turbo cars to spool. A friend of mine seems to make it look easy. He has a stick shift car and the darn thing is deadly fast and consistent. He can make build boost instantly and can sit at the tree forever. Anyhow I am thinking of trying this no2 thing against the brake once I get a handle on tune up and all.

[Steve Lazar]

Just an idea ..... use a timer, so that the timer arms when the full throttle switch is activated, and starts with the release of the tranny brake button. You could adjust how soon/late the hit starts

[brothern2o]

man can hardly figure out how to wire the battery up I just have a button in left hand and put transbake in my right and on a pro tree I count one thousand one once everyone is staged and just let er' rip

[sso2028]

man can hardly figure out how to wire the battery up I just have a button in left hand and put transbake in my right and on a pro tree I count one thousand one once everyone is staged and just let er' rip

all you guys are way over complicating things, i'll let yall in on a little secret first off yes you can do all this with all these crazy relay configurations and timers but it is totally unecessary ,just call biondo race products and simply order one of his 3 wire trans brake buttons all it is ,is a normally open normally closed switch. wire it in conjunction with a wide open throttle switch and your done. when the transbrake is activated the nos is not, only when the transbrake is released under a wide open throttle condition the nos system is activated this will also allow you to run on your 2 step with absolutely no problems and the only thing your gonna accomplish by spraying the nos before you launch is breaking your motor or some expensive driveline parts.

[nosgt850]

Ours turn on with a pressure switch on the transmission, when the pressure drops after the tranny brake is released the nos come on. You can adjust this with different pressures switches for higher or lower pressures required to activate the nos!

[drwizrd]

I am not trying to jump treads but I was wondering about how I have mine wired, window switch for n2o on and off, turns on after 2 step but before converter flashes and turns off 400 rpm before rev limiter. I use timers triggered by the window switch to activate each stage of nitrous as well as pull out timing.

I have been reading this thread and thinking about re wiring mine...but I dont know if it is ok the way it is and I should leave it alone! LOL I have only tried it 1 time and the fuel pump went out (damn BG 280pump) on the nitrous side, so I did not learn much! LOL
I do have a fuel pressure safety switch installed and working as well as the car is equipped with wide band!.....I have a LOT of money invested in trying to save parts!

[dahmer]

all you guys are way over complicating things, i'll let yall in on a little secret first off yes you can do all this with all these crazy relay configurations and timers but it is totally unecessary ,just call biondo race products and simply order one of his 3 wire trans brake buttons all it is ,is a normally open normally closed switch. wire it in conjunction with a wide open throttle switch and your done. when the transbrake is activated the nos is not, only when the transbrake is released under a wide open throttle condition the nos system is activated this will also allow you to run on your 2 step with absolutely no problems and the only thing your gonna accomplish by spraying the nos before you launch is breaking your motor or some expensive driveline parts.


I like this idea. This is the second time I am hearing about this. I think I am going to do it. Anyone need a brand new NX Snap relay???

[dahmer]

I tried finding the Biondo 3 way transbrake button. Can you let me know what part number it is?

Thanks

[sso2028]

I tried finding the Biondo 3 way transbrake button. Can you let me know what part number it is?

Thanks

sorry don't have biondo's direct # but summit sells them and the part # is SBR-MUSH AND YOU WILL NEED THE 3 WIRE STRETCH CORD PART# SBR-SC3 ALSO IF YOU CALL SUMMIT THEY WILL GIVE YOU BIONDO'S DIRECT PHONE # IF YOU HAVE ANY QUESTIONS . JUST MAKE SURE THE PART # I GAVE YOU IS THE THREE POST SWITCH DESIGN I COULDN'T TELL BY THE PICTURE IN THE CATALOG, OR JUST GET THE PHONE # FROM SUMMIT AND ORDER IT DIRECT FROM BIONDO HE ALSO HAS AN ADJUSTABLE SWITCH FOR BETTER REACTION TIMES, PART # SBR-AB.