NITROUS OXIDE ( nos / n2o ) advice forum

so, new system, using 2 tandem sets of pulsoids and two crossfires

twin bottles


heaters visible, one pressure switch, 5mm line


pressure gauge in dash, made an error fitting, so will be rebuilding the console over the winter, unless i get bored! the gauge feeds from the blance pipe


fred/maximiser on custom bracket (angled towards me)



solenoids, crossfires, and new wot switch/bracket





its working beautifully, and im hoping it will yield a mid twelve with some testing on the controller, jetted i estimate to a total of 150 BHP, using 75% until i can get a fuel cell and second pump for security

i am running a 200 fuel jet and 150 N2o in each set of pulsoids, which is a little leaner than previous, but having made a road test last night, it feels very quick indeed! (over ran the brakes!) so im hoping for good things!

can anyone give me a rough estimate of expected power either total or per set?

cheers

[quote="capriv8"]its working beautifully, and im hoping it will yield a mid twelve with some testing on the controller, jetted i estimate to a total of 150 BHP, using 75% until i can get a fuel cell and second pump for security
You should use smaller jets so that 100% is 150 HP or in your case it sounds like 100 HP jets should be fitted.

i am running a 200 fuel jet and 150 N2o in each set of pulsoids, which is a little leaner than previous, but having made a road test last night, it feels very quick indeed! (over ran the brakes!) so im hoping for good things!
Sounds promising

can anyone give me a rough estimate of expected power either total or per set?
The power in your case is equal to the size of ONE nitrous jet (150 HP), so not as much as you thought.

Thats what i was trying to say! More clearly put; i believe i have 150bhp at 100%, but i have the controlle set to 75% of total, so circa100 bhp in use

I am trying to up my fuel system capacity at the mo, so should be able to use the full 150 safely then


I think the clutch is trying to slip, at the upper revs in 4th, so a paddle may be required asap, but then im prepared to try some serious power, althoue i dont want the engine to go nuclear!

The same principle applies, you should use the jets to adjust MAX power not the controller for optimum performance.

There's no reason for your motor to be at risk as long as you have the mixture & timing right, as I repeatedly ran 300 HP on a STOCK RV8 motor.

quick update

to eleviate concerns about fuel capacity and lack of therein!

ta daaaa!

fitted a box section frame to car floor (will save the tedious step by step shots! here you can see the pumps mounted to alloy brackets, these free flow 100GPH each, and are rated safe to around 400bhp each, so should safely deal with my use!



fitted an 8 gallon fuel cell, foam filled with the two necessary pick ups, those are 8AN, which translates to a half inch bore



two pre filters, are actually diesel filters, but i struggled to get 1/2" bore filters that wernt astronomically priced, these should be fine, as diesel pumps need to be festidiously clean internally



all repiped with 3/8th bore cupra nickel through the car, with adapters to the carbs 5/16 as close as poss, similarly on the nitrous solenoids/system, te second pump is operated when the system is armed

this is justa gratuotous burn out shot, cos i like it!



you can see the system in this vid>>>

http://youtu.be/M5aUEFfGVh0

up to press the car isnt really doing the business, with a best of around 13.4, whish is a 2 tenths drop, baring in mind the new tyres dropped my 60foots by 4 tenths, im a bit disappointed, the car is bogging in 4th gear, and id like a lower ratio diff, but they are rare and expensive (running 3.31:1 and 26" dia tyres) however i think, that the fred was not holding the nitrous level through the gears, ie returning to 20% on each gear change, so im hoping now i can unleash the full 150bhp jets that it will improve my times, will also buy some larger jets, so i can step up to a 200bhp upper level and see what happens for next time!

Those look like Carter marine / competition pumps. As far as I know these are rated at 75gph free flow. But if these are bigger let me know what they are because I'll fit them in my sons escort as we are using the 75 gph models in there at the mo.

These pumps like a flooded suction line so make sure you keep the tank topped up to a level above the pumps. They will actually deal with a little suction lift if the fuel level is low, but they dont like it and will wear quickly if left to do this a lot. And you cant buy repair kits for these pumps.
Can you blow through those fuel filters and feel almost no resistance? If so then they will be fine with those pumps.

What size is the vent on the fuel cell?? is it actually open or capped off with that blue thing??
If the vent isnt open then the fuel supply will drop off quite quickly.
For what you want to flow out in fuel you should be looking at a -6 min but preferably a -8 open vent on the tank.


Sounds like you need to set FRED to "reset off"

As Trev says!
Set the max power output by jetting with the contoller running flat out and not using the pulse feature on the controller. Do some nitrous and fuel flow testing so you know exactly what you have available. If you are running 13.2 - 13.4 on a stripped out Capri with sensible traction I would estimate that you are making around 320hp.
If your 60 foot dropped by 0.4 and you were only 0.2 off your previous 1/4 mile ET pb then it shows that the car is making more power mid track with this setup.

How much timing have you taken out for the 150 shot??

That vid is nice. The best bit is where you put the camera on the floor to the left side of the car and then give it some revs !!
It looks great. And sounds even better... Nice job

They are carter comp pumps rated at 100 gph each and can be mounted upto 2 feet above the tank, i got the second i think from unique autocraft as they were significantly cheaper

The first has been fitted for around 7 years, so going ok so far!

The vent is 6am and conneced to the original tank vent ipe

Havent dialled the timing back at all yet, how much would you recommend as im stepping upto 200 jets soon, going to get some grade 8 plugs too to be safe

Thanks for the info on the pumps mate!!

If you are thinking of a 200 shot go a bit safer than the rule of thumb which is 2 degree's per 50 shot. I assume you mean jets for 200hp and not a size 200 jet that is?

Use the makers max ign advance figure as your starting point and subtract from that by 8 degree's. Then take another 2-4 degree's out for your first test run and see how she feels and see how the plugs look after a pull. Then try adding 2 degree's and see how she feels etc..
This is where a dyno session really helps. Its not cheap unless you get on one of my dyno days but its worth every penny. On one of my last dyno sessions I squeezed an extra 34hp out of the old girl with just 2 more degree's of retard on the timing. It took 3 pulls on the rollers to figure this out though.

Keep us posted on the testing

Perry