NITROUS OXIDE ( nos / n2o ) advice forum

Hello just installed wizards sb75 to my aprilia rsv mille 1000 twin cylinder bike
Using it for drag racing only at moment . Cross fire injectors into trumpets, minimax controller, ignition has been retarded by 2 degrees , ngk cooler plugs and race fuel .
currently running 25 shot which does make a slight diffrence but thinking about going to 50 for the strip . There's loads of info everywhere regarding nitrous on the jap stuff but hardly anything on 2 cylinder engines . Is a 50 shot on a v-twin in effect the same as a 50 shot on a 4 cylinder bike . I imagine not as same amount of nitrous /fuel is being split over 4 cylinders and not 2 ?? I hear people talking about 100 shot on some bikes at the pod but would imagine they have lower compression etc to compensate . Basically do you think a 50 shot on a v-twin is reasonable ? He he i bet you get bored of answering the same questions , sorry it's all new to me !!

Thanks for your advice!


Bike is fuel injected and also has power commander for fuelling side . I need to get PC set up to make sure , currently doubling the jet for fuel 25/50 so will pull plugs and have a quick look .
As for the timing , have I got this round my neck or something ? , my aim was to just use a 50 shot this year so everyone I have spoke to has advised me to retard ignition by 2 degrees to prevent the danger of engine knock . Is this simply cods wallop !!!:)

I know that higher octane fuel in effect retards the ignition anyway with the slower burn .

Thank you for your time Trev
Chris

How have you set the power commander up?, from what I've seen they run pig rich from the factory.

Ok that's great thank you. Power commander is set up for bike as it stands without the nitrous.
I do have a bottle heater so psi should be constant . I currently have a 25 nitrous jet and 50 fuel and was going to up it to 50 nitrous 100 fuel which I am assuming is the correct way of doing things.

I had a custom eprom made to accomplish the 2 degree retard so will swap it back to the standard chip if there's no point

just one last question , why do you not need to retard the ignition with YOUR system but you do on the US crap . Is it all down to the solenoids or progressive controller or both?

Thanks again Trev will be up on sat for some bottle fills . Santa pod on Sunday complete with thermals !!!

Should be 100 nitrous and 50 fuel for a 50hp shot?.

Don't think it's my bike that is retarded

Thanks for all you help

My pleasure, keep us informed of your progress.

BTW we have a customer with a similar bike that holds a World Land Speed record ON ICE.

What's happened with this mille? And why haven't you come to see us in supertwins?

Are you twin or single plug?

My buell 1125s run a very similar rotax motor to the mille. But are only single plug heads.
They can run a lot of advance to run well,but standard they don't run too much at wot. The twin plug probably runs less.

I've just run a 30hp dry shot-fixed hit,into the airbox- and gained 3/10ths and 5mph. With 37 - 42 degrees timing at wot from 7500 to 11000rpm. Quite a bit more advance than std.But,and it's a big but,I knew where I was headed so I'm running VPimport 120 octane and very dense

As you've got a powercommander,why not go dry and use the pc to add fuel? Your pc software should be able to show you what pulsewidths you're running,so you can work out if you've got the headroom. It's quite simple to work out how much extra fuel you'll need,if you know how much hp you have at peak torque.

I fitted 750cc injectors to replace the std 440s as I knew there wasn't much spare.

Come and meet the NAST we're a friendly bunch and always very helpful. Our vice chair ran a nitrous mille and there is a blown methanol mille being built as we speak.

I use ECMspy to reprogramme my stock ecu.