87olds442

i have a stock ls3 crate motor with the asa hot cam and car intake( its the gmpp ls376/515.
i have installed a nx pro power plate system jetted for a 100 horse to their specs, 57 nitrous and 52 fuel. i used a zex flow tool and set pressure at 5.2 flowing lbs of fuel pressure. installed ngk tr6 plugs gapped at 28 and took out 4 degrees using the supplied timing curve chips with my 6012 msd box.(i am currently using the curve 3 on motor passes max timing is 19 degrees. i installed the curve 1 for the nitrous which is a max of 15 degrees of timing,) still running 93 octane.
bottle pressure was around 900-950.
when spraying the car the car felt good then if would fall on its face. so i let out of it. i put it back on the trailer and called it a day today i pulled the plugs to put my stock platium plugs in and found that cylinders 1,2,3,4, the ground straps were burnt off and on top of it the number 2 cylinder was missing half the porcealn im lost .. any ideas? im lost

87silverbullet

iTrader: (11)

First, everyone here is going to tell you to get rid of the tr6 plugs, they are a projected tip plug and thats not good for spray. You are going to want to get br6ef's of br7ef to be on the safer side they are non-projected.

Second, is 5.2 lbs of pressure called for on that setup for that plate? It seems kinda low to me. I know most guys set it a 6-7 lbs. You also might want to pull a little more timing and then put it back in if the tune up calls for it.

87olds442

the system actually calls for 4.8 flowing ful press. they have low pressure and high pressure . naturally the high pressure has a smaller jet than the low pressure. im just very surprised that with running 15 degrees of timing and it still seems too much. but i havent really been able to find someone who is running the 6012 box on a carb setup. thanks for your imput

87olds442

anyone else???. i guess im the only guy on this entire site that has a carbd ls motor that has a 58 reluctor wheel on it that uses a 6012 msd box and nitrous.........
thanks silverbullet for the reply ill be sure to pm you of my findings and how good the car runs. i wouldnt wanna ruin the whole meaning of this site and actually share info lol thanks again

87silverbullet

iTrader: (11)

87olds, not many people are running a carbed ls3 on here, so not that much can be told to you. You would most likely would get a better response on yellowbullet since more people there run a carb. The tuning is basically the same but using a different method to get there.

What about using a return style regulator instead of flowing the system like you are doing? Did the pressure drop any when you sprayed the car?

camscam02

iTrader: (21)

19 degrees on motor alone is very low in general. should be in the upper 20's and most carb cars I know are in the 30's.

Im not sure what happened your case, but Id go with something malfunctioning, Im not sure how its creating enough heat to nip the plugs, and those are the front 4 too. Have you checked timing to make sure it was at 15 or 19 on motor?

Also get rid of those plugs next time out and go to a ngk BR7EF.

3fingas

iTrader: (16)

Give some more info on the fuel system. Timing sounds bout right.

87olds442

no i never checked the timing to verify that the pills are giving me that timing curve. i thought the timing in general seems on the low side to me that i even called msd a while ago and asked them why was there such a big difference as far as timing goes between the 6010 box and the 6012 box and he couldnt answer me and he left it at that.
from now on i think i am gonna stop using the pills and just set the timing to their reccomendations and program it to the box like i was making my own curve to cancel out it the oills are no good.
i bought the tr6 plugs over a year ago because i thought that was the plug to use on a small hit but ill definitely get the plugs you reccomend

thanks

87olds442

the fuel system consists of a 16 gallon fuel cell. with a -10 into a a1000 pump . with a -10 all the way up to the front to a Y block that has a -10 going to my a1000 return regulator and the other part of the Y tapers to a -6 to a areomotive dead head regulator for the nitrous. i was told by many people that the a1000 pump would be fine ran this way with using a 100 shot plate system. unless i was misinformed . but i have another track rental in june and ill be using probably a mallory comp 140 alone for the nitrous system

87olds442

very true. and i like the idea of the return style regulator for the nitrous . havent heard too much of people doing it though

3fingas

iTrader: (16)

never dead headed to a n2o reg. But if im picturing this thing right the carb is returned so why not tail off the reg instead of y'in before it. If its falling over after ur out the gate, smells like fuel starve not cause ur running short timing. What timing does the motor like NA? If im guessin 26-28 then you can add but it would be nice to see some plugs from a clean hit first. JMO

87olds442

well my a1000 reg has a -10 feed ,-8 return and two -6 to the carb. i did have it where i T'd off one of the -6 lines to the carb with a reg but was told not to run it that way by a few people. n/a the motor like the "curve 3" chip which the timing is as follows

0rpm 0 degrees
1000 rpm 4
2000 rpm 18
3500 rpm 19
5000 rpm 14
6000 rpm 17

this is the timing curve that the car has run the best et and mph
so with the 100 shot added i reduced the timing to the "curve 1" which is

1000 4
2000 14
3500 15
5000 10
6000 13