Custom PCM program will give me 28.5 degrees timing all motor. It was dyno tuned all motor for max NA hp and works great.
With a lil more tuning, Arm the nitrous and spray a 300 shot. I now get 18.5 degrees timing on the nitrous via the PCM. No external boxes...no switches flipped, same program (no switching pcm tunes between NA and NOS), no IAT tricker (tried that didnt work for me).

I now have the best of both worlds NA max tune, and safe tune for nitrous all within the PCM.

Anyone else doing this? If o how did you accopmlish this? Just curious.

 

I don't know how it could be done? I just use the Timing tuner. How do you do this Al? Even with the 18.5 degrees of timing, how much race gas do you run if any?

Thanks
Glenn

 

I run 100 octane with both stages 150/150. 93 octane with single stage 150 or dual 100/100

 

It would be interesting to hear how you have done things. I once thought you might be able to set the PCM to a certain timing amount once the IAT saw a certain temp. So instead of tricking it, you set it to drop timing once it see's really cold temps, like when you are spraying. I've never seen my IAT reading go lower then 69 or so degrees, and I havn't watched them while spraying so I can only guess this is how you might be doing it.

 

Damn that is what I have been trying to find out and so far found nothing?
My only way was this
LS1 Edit for N/A getting the most hp I can out of my Heads and Cam.

RamChargers Timing Turner for when I spray but didnt want to buy another program.
How did you do this?

 

I spray on my car and let the computer retard the timming by it's self,I"ve made well over 100 passes on this setup.I run race gas 109 and make sure it dont hit the limiter.I would disclose How much I run but some people in my area get on this board alot,I really dont want to share the info with them.

 

I am running/using two different LS1Edit flash file. When at the track, I load the one with about 8 degrees of timing pulled from 3000+ rpms. When I am done at the track, I load the N/A one. Each load only takes about 3 minutes

 

Did you reprogram your computer in such a way that you get more timing retard. like 8-10 or more degrees? Or just the normal amount of retard that some see with a dry kit. Is youra all dry or some dry some wet? Thanks for the info!

 

Since I have LS1-Edit, I programming the IAT to pull back some timing with a tricker. If I didn't have the editor, I would use the Timing Tuner. As far as using the IAT to pull timing with cold temps, that would work if you sprayed BEFORE the MAF like a dry system. I am looking at a DP setup.

 

I know the mustang guys have flip switches set up in their cars. The ECU has two different modes and you can just flip from one to another. So for pump gas it would have a tune and then for race gas they would flip the switch and have a different tune. You could probably do the same thing, but just hook it up to your throttle switch for so it turns on when you activate the system

 

is there a way with ls1 edit to make 2 tunes so you can just just flip a switch when you spray (NX wet kit 150 shot) like the mustang guys? If I had access to just load up my nitrous tune before I race I would do that but I dont.

 

woudlyou happen to be using the low octane table? i knwo this has been talked about but have not heard of anyone doing this... i am using the timing tuner.. but would liek to know how you accomplished this for future reference..

Wes

 

Not with low octane tables.

Im not trying to be super sneaky...and I will share with you guys soon. It was just said to me that this type of tuning is nothing new and lots are doing it. I personally havent seen anyone else do it yet. I wouldnt doubt there may be a shop or tuner out there that just didnt share yet. Anyways...Ill ask Jeremy at Fasterproms to come in here and share a bit on the subject. Im trying to get him to be a sponsor as well.

 

If you are referring to my comment to you in IM, I think I said something like "Cool approach see if other folks have done that too." I don't recall all the details but the approach makes a lot of sense.

 

Patiently waiting to hear about this one.....

 

Yeah...John knows the basic rundown
And no I wasnt refering to our convo at all John. Just something discussed on another board....no biggie

 

I have read of people doing it with dry systems, based on MAF input. I think the spark table is set up so that when the MAF signal exceeds NA levels the PCM retards timing. Perhaps Torque Management could be used to achieve the same result.
Not sure how it could be achieved with a wet system though.

 

Bingo! Dam Aussies are pretty darn smart
You could only do it with wet if you use two or more stages and make the first one dry...even a small dry of say 75-100 hp would be enough to ensure you dont dip into the NA area on the MAF tables.

But looking closer at this prospect...there could be alot more. It seems There are multiple ways to set up your multi stage Dry/wet custom nitrous kits. Lets just take an imaginary stout three stage setup for example.

You could get larger injectors (say 36 lb) and then do a full all motor max power tune for that setup. Then use a 150 shot dry to be your first stage at 3000 rpm. Since the difference in MAF flow while spraying will quickly seperate VS NA the PCM will follow a very different path on the MAf table. So different.... that under no circumstances will your NA MAF curve and dry shot curve intertwine. SO at that point you can begin to set the timing values where you want them. Based on MAF flow VS rpm.
So...say we have 28.5 max timing all motor...we then spray a 150 shot at 3000 rpm. That will set us well above the NA MAF curve and we can begin to take out timing...say we will take out 3 degrees for the first 150 shot.

Next we hit it with another 100 hp wet at 4400 rpm. Since we are still spraying our dry shot and the MAF is still well above the NA MAF area we still have control of timing in that range without affecting NA area. So since the MAF table is MAF flow VS rpm...and we activated the second stage at 4500...we can pull another 3 degrees at 4400 rpm for a total timing of 22.5 at that point. And again at 5500 we spray another 100 wet...we can pull another 3 degrees for a total of 19.5. Or something close to that.

All done via the PCM
There are still a few minute details Im leaving out that Jeremy at Fasterproms didnt want to give away...but this is the main gist.

 

So Al, your saying I can hook up that NXl kit when it arrives, and have my current wet kit, converted to dry and spray a lil ole 100shot with a modified MAFtable and pull the timing? Cool. I like that idea.

 

CAT3...so far so good on mine. I still need to do some further testing....and Im dual stage dry. But I actually want to go three stage dry/dry/wet. That will be down the road a bit.

I think I also want to incorporate a proximity switch near the shifter to disable the second and/or third stage off the line.