well my surging issue has been found, we upped the spark dwell and the surging in second is almost gone, ive lurked around the hpt forums and some people say 6ms is the max but this is for fbodys i belive. My question, is it safe to hit say 5.3-5.5 ms past 6000 rpm cuz thats where im getting the surging, between 6000 and 7000?
Right now the car is a hair past 5ms and it looks like it needs to be upped just a tad more for a clean redline, thoughts are welcome and yes i searched but no real concrete reason was given on what happens to the coil packs and what the dwell was set at when failure occured.
thanks again.

 

interesting... I too would like to learn more about this.

 

Mike I think it was 5ms we were around not 5000ms, that's 5 seconds

I'll check the RL forum

WOP is needed for this one

 

I believe Rob posted something about this....I can't remember what he said either. Time to search

 

I think it's "interpolate" as there is no extrapolate that I see

Ok here is the stock dwell (or GMS2, I don't remember which one this is)






and this is with interpolation:







I don't know about his one as it looks too easy. There is no way a nice even graph can give you the best result, maybe in theory but never in practical.

Mike I say we increase after 6K until it's good.

 

true....

 

I don't know about his one as it looks too easy. There is no way a nice even graph can give you the best result, maybe in theory but never in practical.

Mike I say we increase after 6K until it's good.[/QUOTE]

OOPSY ya too many numbers i get confused, still learning LOL
yer the boss

i edited my original post, makes a tad more sense now lol

 

Mine is set up a little higher just in one little square spot. I'd like to hear more about this too. Like what the side effects are and what changing the numbers actually translates to.

 

Increase the dwell time to 6ms It will be fine. The amount of time spent there will not affect the coils negativley.
The Ls1 truck coils have been proven to 1400hp.
I'm sure Gm did a good job on the LSJ coils.

 

hmm interesting, thanks buddie!!
what should the gap be for the plugs?

 

Grap them at .32-35 With a 7 heat range plug of your choice.Stay away from iridium plugs. Let me know how this worxs for you.

 

So what does the spark dwell actually do?

 

right now they are at .32 with ngkbkr7es, as mase upped the numbers car got better, needs a bit more to be perfect, its wierd cuz the only gears it does this in are 2nd and 3rd, i can usualy get on her in second but its almost imposible to max 3rd during the day, so hopefully when the redline is smoothed out in 2nd, 3rd will be good aswell.
thanks again.

 

If the dwell time is too short, the current in coil doesn't have enough time to charge fully.<and you want the most current you can get>
The longer the dwell the more time it has to charge.What your expierencing is most liklely some spark blow out.
2-3rd gears have more load on the motor.

 

makes sense.

 

So this can negatively affect the coils life?

 

It may shorten the coils life, it will introduce more heat into the coil. I haven't heard of any coils failing on any ls1's or lsj's that i know of.

 

So they say don't go over a certain MS and don't go past a certain RPM? Do you know what the rules to this are? I may try it

 

so by increasing it to 6ms, thats the safe zone per say?

 

Here's the link to Rob's older thread about this. https://www.cobaltss.net/forums/show...ht=spark+dwell

 

Small Changes are best and see what the Car likes. You want to get away with as lttle as you can .

 

so in my case if the car pulls good using 6ms, i should be ok correct?

 

Here's another link from the HP Tuners site about spark dwell http://www.hptuners.com/FORUM/showth...ht=spark+dwell

 

Very interesting stuff here. I gotta get this stuff down so I can get my own HPT suite.

 

bump for the evening