383LQ4SS

iTrader: (33)

Cant wait to start hittong the direct port with this.This is from the Altronics 8 EGT datalogger. I think I will find this useful. Having the RPMs logged is a neat feature too. It takes a little getting used to looking at the graph and I cant show it all here because I had to do a "print screen" to show it. But in the program you can pan and zoom and deselect certain cylinders or whatever. The red line is the rpm, on the bottom is time, and to the right would be temp but you cant see it because its cut off. You can see the cursor on the graph though...wnd where the cursor is it shows the info for each cylinder on the left in the corresponding color boxes. I only logged one run but its very interesting. It shows a continous climb in temps as you go through the gears. Irrespective of load.

That alone shows you why you may get detonation in the higher gears and not in the lower etc. I cant wait to start spraying with this thing.

BTW,,,you can see each gear shift...but the first peak in rpm and then drop to 2700 rpm is actually me spinning at the track and then letting out and bogging back down to 2700 and getting back in it....after that all gears shifts can clearly be seen.

camrsz

iTrader: (4)

Thats a great tuning aid. What was the cost for the set up?

Robert56

iTrader: (2)

Great, individual cly tuning. Now can the average guy get ahold of this? You can clearly see that a few cly are out of wack compared to others. A great tool for VE tuning. As we know, if you can get each cly closer to the same your VE will be increased.
Robert

CAT3

iTrader: (9)

Very nice. Not so sure each cylinder can end up being the same EGT, doesn't placement in the firing order vs. intake tract distance have some effect on that? I know you could go one jet size larger or smaller, with spray, but NA wise you simply cant tune each individual cylinder 20+/- *, or is there software out that can accomplish that now?

Charlie

383LQ4SS

iTrader: (33)

Altronics advertises at $999
I got mine from ebay for $750

You should see the amount of info it can save. You can zoom in like crazy to where your looking at few hundreths of a second. Its amazing how much temp changes and how rapidly.

Definately a few cylinders out of wack but not so bad I am concerned for the motors safety. However there should be a few ponies to be had here and there. I think I am going to start swapping out injectors to see if the leaner or richer cylinders follow injectors first.

383LQ4SS

iTrader: (33)

I also niticed its very weird how they are way off with no load...and then as the run starts they begin to marry up much closer as temp increase.

CAT3

iTrader: (9)

Swapping injector from low to high egt was also a good thought. How else can you control the delivery though during NA?

383LQ4SS

iTrader: (33)

not sure...I will have to investigate. Currently the only way I know if is with something like the BS3 or FAST with individual cylinder tuning.

One thing I did forget...I need to ensure each probe is the exact length inside the primariy first. Then start datalogging for real.

CAT3

iTrader: (9)

Yep, exact same length from flange, and depth. I think I'll be watching this develop

Big Mike

iTrader: (4)

383LQ4SS, your car is gonna FLY when its all ready to go!!!!!

What is your raceweight? Have you considered putting a glide in the car and putting it well into the 8's?

Ben R

EGT's aren't a good way to tune direct port nitrous. ESPECIALLY if you're not VERY familiar with spark plugs.

383LQ4SS

iTrader: (33)

MIke...its definately getting an auto. I would say the race weight with me in it is currently somewhere around 3250-3350. I will try to weigh it soon.

BTW...I ran at the track last night on motor. Of course the gearing is all wrong for NA and I just barely shifted into 4th before the traps and the DA was 2500+ with 94% humidty, and I only managed one real run. But I did go 10.7 @ 128.6 mph on motor with a soft 1.57 sixty foot.

I am fairly certain the next time at the track I will see some 10.5s @ 130 or so in this heat. I may switch to some 26x10.5 ET drags to help with the gearing on motor too. I have hit plenty of low 1.4s on those tires previously.

SO If I can get everything right I am hoping to see some 10.2-10.3s at 132-133 on motor with good weather. Then hit it with a well tuned 300-400 shot by gear with the NX MAximizer II. I am thinking about a 100 out of the hole ramping to a 175 by 7200 rpm. And bring in the full 300-400 or so in third and fourth by rpm.

VINCE

iTrader: (1)

That looks complicated...

Ben R

You're lucky you're not using plugging your Racepak sensors into your Big Stuff 3. THAT can get confusing. SO MANY COLORS DAMNIT!

Ben R

Actually, you're more prone to detonation in the higher gears because the sweep rate of the engine is slower. The temperatures steadily increase because the heat is constantly applied. You can have an EGT reading of X one time and be too lean and then X the second time and be too fat. It's not a very good way to tune nitrous. 8 O2 sensors would be the prefered method.

Somebody09

You're right; you can't. GM uses batch fire. MAYBE, since it's EFI, you can reprogram your ECU. Tis the reason I didn't even bother with individual cylinder A/Fs. I even said to hell with the dual channel wideband I was going to get.

-somebody

CAT3

iTrader: (9)

KCB, I think that the O2's are a good idea, but 8 Widebands would rock

383LQ4SS

iTrader: (33)

Im pretty sure the LS1 is sequential...not that that really matters.

As far as using the EGT as a tuning tool..its very useful IMO...but only as a comparison of cylinder to cylinder...not really to get AF.

I think its still going to be essential to tune AF via the wideband and timing for best power first...then take a look at the EGT's to see any major variances. Thats why i decided to get the wideband datalog option with the MAximizer from FJO. That will be the primary tuning tool. The 8 EGT's will certainly tell you if something is out of whack though or in the case of this unit...cut the nitrous if EGT raises above a critical temp on any one cylinder. The FJO wideband can do the same.

CAT3

iTrader: (9)

Is there a way to cut it if there is a substantial difference b/w any two cyl?

383LQ4SS

iTrader: (33)

no...only a window to set MAX egt's. If any cylinder exceeds that setting...it gives a 12 volt signal out.