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,
Is it fuel injected?

minimax controller, ignition has been retarded by 2 degrees, ngk cooler plugs and race fuel.
You don't need to retard the timing unless you advanced it from standard to start with.

currently running 25 shot which does make a slight diffrence
Retarding the timing will have reduced the effect but even so, it should have made more than a slight difference, so the mixture is probably too rich. What jet sizes are you using?

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.
There's no real difference with regards to application.

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 ??
It will make the same peak power but due to the difference in engine characteristics, the torque up to peak power will be a bit different but different 4 cylinder engines can produce different results to others anyway.

I hear people talking about 100 shot on some bikes at the pod but would imagine they have lower compression etc to compensate.
There should be NO need to lower the compression unless its abnormally high to start with for well over 100 HP gain.

Basically do you think a 50 shot on a v-twin is reasonable ?
MOST CERTAINLY and even 100 HP should be OK with a progressive.

He he i bet you get bored of answering the same questions , sorry it's all new to me !!
No that's fine as they are usually a bit different and I'm more than happy to set you on the right track.

Thanks for your advice!
My pleasure

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 .
Do you have a bottle heater?
When you say you're doubling the fuel jet size to 50, do you mean without doubling the nitrous jet, because if so there's NO point doing that as it will be WAY TOO RICH.

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 !!!:)
If you were using a JUNK US brand kit then you might need to retard your timing on a 50 HP increase but you certainly should NOT need to retard the timing when using OUR system, ESPECIALLY with a progressive controller.

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

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.
THAT EXPLAINS IT!!!!! The jets are the WRONG WAY ROUND, so you are ONLY adding 12.5 HP of nitrous AND FIFTY HP worth of fuel, so it's FOUR TIMES TOO RICH which will KILL OFF 90% of the 12.5 HP it SHOULD be making, so you'll probably be lucky if the bike was making TWO HP, so no wonder you were less than impressed!!!

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
With that 2 degrees of retard you probably KILLED OFF 50% of the TWO HP leving you with JUST ONE!!!

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?
Numerous reasons;
1) Better product design means the nitrous reaches the motor in a more dense form which makes the charge less prone to detonation
2) Better system design and choice of components and fitting instruction, reduce the effect of nitrous reaching the engine before the fuel (which causes thermal shock to set in), so the timing doesn't need retarding to counter that effect.
3) Delivering the mix with a progressive means less nitrous is delivered when the motor is under most load and combine that with all the above and it means you need to retard the timing even less.

Thanks again Trev will be up on sat for some bottle fills . Santa pod on Sunday complete with thermals !!!
I hope you can make it up here on a weekday as we're closed on Saturdays now.