Someone was going to post these numbers on the Advent CDI for the GPR, but I could not find them. Dana, I believe it was you. Does any one have these numbers posted, and which one would you select for a single piped GPR with about 150 psig, and stock carbs modified? It looks like the Stinger II curve may be the ticket. But then again, the "modified stock" curve may work. I wanted to see which one of these curves end up more advanced. TIA

Salty

this thing is killing me!!!

Salty I spoke to Dan Lamey in reference to this issue and he told me tht the single piped cuve was developed for a GPR with the cat con installed. He recommended using the Stinger
setup for D-Plate and Stinger II applications

Fercho,
is the curve for the single pipe (cat-con installed) equivilent to the stock timing curve?

Do you have both of these curves that you could post? (stock curve from stock cdi and advent curve set at single pipe set up)

Salty, I cam email it to ya if you like. What I have is a big file.

Md as far as I know now its not the stock curve is an enhanced stock for single pipes with cat con installed. I do not have the curves with me and wont have acces to the info until Monday

If I recall its more aggresive than the Stinger curve

Go Faster,

That is exactly what I need. Please e-mail to hernandr@bp.com. Appreciate it.

Salty

this thing is killing me!!!

there are many curves wich one do you want to use ? with the d-plate the stinger curve works very well but with higher compression be aware of your fuel and where you purchace it . one bad batch and detonation will start to show .....

pro1....good advice, take it.....

stinger 2 curve is the way to go with a d-plate...

Do either the advent or Riva CDI have a timing curve that is identical to the 01 stock curve?

I am confined at times to re-fuel with local on the water fuel stops and myself as well as others have had problems with fuel octane quality. Therefore, I would like to set the cdi on a stock curve if need be for where I'll be riding and still have the advantages of the power valve remainging open and a higher rev limiter setting.

you can have the advent programed with the oem curve....i have it programed on one of my settings....NFG...but if u must u can...its not the easiest thing to get at just to change a switch....

this would be my suggestion if fuel quality is a concern.....add only the advent and leave the compression @ stock. u may be pussing it with 89 octane however, 91 would do the trick so long as you do ONLY the CDI mod...try a colder plug with this setup as an extra safety precaution....if u dont have a fouling problem (with the colder plug) then that would be the safest route. the ignition curve by mr. lamay is well worth it.

[ 01-13-2002: Message edited by: HopatcongGPR ]

I have several of the Advent curves. I will send them to you tonight when I get back. I also have the stock Yamaha curve to compare them against. Later.

MD you can have it programed with whatever curves you want. Order it with the oem curve installed and then whatever else you would like.

Pro1

What curve were you using before you went to triples ?

I have an almost identical situation as MD. I can always get 91 octane, but there are only certain places where I can get av gas.

Liquid Missile would you please send me a copy of the timing curves also.

Thanks

spud,
before i made the exhaust switch i was using the 115 curve (stinger) ( i think that was the number) lol it was pump gas safe but with 150 psi you may have a detonation issue unless the gas is exact. myself and along with some others noticed signs of detonation so i lowered my compression down to 135 , but keep in mind that its the final compression ratio that is main key to having a safe and reliable motor.

This is why I want the stock timing curve on a CDI when even running stock compression for certain rides

I have access to ride with 4 to 6 other pwc on rides that cover 150 to 200 miles in a day. Most of this ride is at WOT except slowing for several locks or to refuel. Basically I've been unable to keep anything but a stock engine running for any length of time with these repeated runs and using the fuel along the way.

These runs will literally destroy Sea Doo 951 engines and any others that are modded and running pump gas compression. The fuel quality is the issue for the Yamaha engines.

Just imagine having to run a 2 hour endurance race with all participants having to purchase their fuel at a desolate and deserted marina!!!

The fuel quality at several fuel stops is not what you can trust (sometimes tainted with water),,not like going down to your favorite gas station and buying 15 gallons of 93 or 92 octane.

So I must use a stock curve due to the environment I ride in. Even in stock form, there is a risk with the fuel being contaminated and causing a problem but less in stock form.

MD,

It sounds like I do a lot of the same type riding you do. I really think I'm going to leave the compression alone and get an Advent CDI. I am getting all the timing curves I can get my hands on. I don't have one that I know is stock. I would like to get a stock map to compare against the stinger d-plate. My feelings are to maybe have the timing advanced somewhat in the lower rpm's and have it return to (or close to) the stock advance at the higher rpm's. If this setup would give me any more acceleration I would be happy. I think I will also stick to the 13/19 impeller and one range colder plug to help out with the spark advance.

**** who am I fooling. The first time some jack *@# passes me I'll be on the phone with the credit card out getting a head, Proks and a 14/20. Thats just the way it is.

I'm hoping Fercho can get me the rpm's where the power valves open. Hop gave me some real good info on setting the ignition and plugs up.

Thanks all

Spud
I'm glad that you understand that your mods must fit the conditions you ride in, especially your potential fuel stops..

My thought is to run stock compression yet take advantage of the superior rev limiter setting and keeping the valves open during rough water conditions. Granted the timing advance would be great for improved acceleration and maintaining top speed in the rough, however I'd have to ensure that I personally filled the fuel tank at a know quality provider with a minimum 92 octane (preferably non-oxygenated fuel).

I think if I could find a curve with slight advance up to 5500 and then match the stock curve I'd be fine. I hesitate getting any timing advances from 5500 and up, especially right before the powervalves open when your at maximum compression.

I wonder if Riva could post the curve for their CDI that is set up for a stock engine? Also compare it to the stock timing curve. Then again Riva do you offer a curve that is identical to the stock curve?

Here is the Stock, Stinger2, and Enhanced stock curves.

the r&d curves were on an earliear thread...looks like riva hit the delete key again....call r&d direct.

FYI: the yama-84 curve is what advent put together for increased compression on a oem piped boat. it was put together after a few guys questioned the enhanced curves' reliability on a increased compression boat, 92 octane and br8es plugs.

the enhanced curve (yama 53 - which was designed for oem compression and pipe) has more timing on the bottom and a closer spread on the high end of the spectrum without the pulling back of timing on #2 & 3 as the stinger curve(yama 59) does....

some more info, just search curves, ignition or advent...there is a lot of info on this forum on this topic...i thought we were trying to save space and use the search function????

[ 01-15-2002: Message edited by: HopatcongGPR ]

thanks for posting the curves LM