Viper Ignition Curve

D

ducky_d

Member
Joined
May 21, 2003
Messages
32
Last edited:

what are you asking??????????, if your pipes run ar 8900-9100rpm, then thats where its designed to be run.
 
Is the ignition much advanced in my viper cdi at that rp/m if we compare to the srx cdi ?
My peak hp rpm seems to be 8750 if we look at the dyno result.
My thought was to overrev to 9000 rpm and loose a couple of hp but be safer (had to replate the cylinder from last years piston "cooking".
My Q is:Is the ignition much advanced in my viper cdi at that rp/m if we compare to the srx cdi ?
 
yes it is, but your comparing 2 differnt sleds here and 2 completely differnt PIPE DESIGNS. The engines are not set up the same as each other. Your SLP pipes are designed to work at a rpm where its not as much timing and begins to retard the advance, the srx retards its timing much quicker because it was only designed to run at 8500rpm with its pipes, the viper needed to have more advance in the timing to make power with its single pipe design it was built with.
 
One thing everyone seems to get all caught up in is the dyno numbers, was that your actual sled dyno'd that day? was the air temp and relative humidity the same as what you ride in? was it the same fuel as you run all the time? was the engine and more impotantly the pipes at the correct temp when dyno'd? Because all these things and many more are going to change the hp output and the rpm level in which it was checked at.

You see what I am trying to make a point of is unless thats the information from your engine on a given specific day and set up its not going to be the same as yours, what if your engine has 100 miles on it and the dyno mule engine has 3000 on it??

When you buy the pipes they dyno the engine set up ALOT of times, over and over till they get thier set up they give you when you buy the pipes, now this set up will never be every last pony available in the engine because you would blow it up the first time it dropped 10 degrees. So it will be rich and conservative for reliablity purposes, SLP has good jetting specs, they are safe and trouble free. Go by what they reccomend UNLESS you are a vid tuner and are out in the field reading plugs, piston wash and tuning the sled to the conditoins in which it is going to be operated in.
 
Nope, im not caught up by the dyno numbers (just using them as a guide line).
Nope, not reading piston wash.
Yes to reading plugs in field.
I understand your point...thanks for taking time to explain anyway.
Would have dynoed my own motor but those mcx-guys say my 2-stroker is sticking in their eyes...(they only dyno 4-strokes nowdays)...
 
You must log in or register to reply here.


Back
Top