I made a run with a very conservative map with AFRs around 11 and boost down to 11psi to establish a noise floor for my setup. As you can see by the graph, my setup goes above Happy zone often. Where should I set my happy zone/zero line? I also included a graph showing a back to back 20psi run as well.

I do notice a big difference in load between the two. Less boost is registering less load which appears to put me at a different spot in my maps. Is there a better way of establishing zero line?

Thx in advance.

 

Mod list:

GT30R Turbo
Equal length tubular manifold
264/264 cams
680cc injectors
255lph Fuel pump
Stock airbox
Stock BOV
Exede w/ SMART
3in TBE

 

I would net change the zero table floor unless changed by Shiv. I have noticed that all of his maps use the same table.

Looks to me that SMART is pulling not more that 4.5-3.5 of degrees timing. It may well be that your timing map is too agressive and SMART is pulling timing trying to keep it close to the happy zone. I would only be worried if the resulting SMART timing offset values exceeded the value if you added timing map table cell value plus the SMART table cell value.

In my case on 93 oct , stock turbo, fmic, tubular header stage 1+ I've had to take up to -3.5 degrees at 7 krpm to keep close to the happy zone and not exceed the SMART limits.

 

Not all cars will have the same noise floor as Shiv has once explained. I want to identify my noise floor to ensure my SMART timing is not pulling uneccessary timing. So if my normal engine noise is at 35 instead of 26 at 7K, why would I want SMART to pull timing?
Related general question - When Vishnu flashes a customer's stock ECU, are they adding timing advancements according to mod lists?

 

I agree on what you say, I have done several datalogs to establish my base floor and to get accurate data had to lower boost and fuel to 0, and left timing as Shiv tuned it . In my case with a stock long block w/HKS cams his table is very close.

 

An option you can try is to create a huge (10+ minutes) datalog of the running around at low boost on high octane fuel. The resulting scatter plot should outline a pretty clear noise threshold.

d

 

Wouldn't my noise level be lower under lower loads/rpms? I would think I would need to be in higher load/rpms in order to tune for noise at "high power" levels. If I were tuning for cruising I would think your thought is fine. I do agree that putting some higher Octane would be a step in the right direction to minimize any occurrences of noises. I have 4-5 gallons of 93 in the tank. No Race gas conveniently near me. Would a gallon of Xylene with current 93 levels be suffice? Looks to be about 97 octane.

 

We listen to the motor with det cans when creating these maps. By doing this, we can keep pushing the car further and further, until we actually hear knock. Obviously when knock is heard, you have a pretty good idea of where the noise floor is. (right below the knock point)

 

Will different setups have different noise floors? i.e. turbos, cams etc?

 

I wasn't talking about cruising. I was talking about going out and running it really hard for a little while to collect noise data all across the rev range. If you use the high speed datalogging, 5 minutes worth of driving will get you almost 30k samples. With so much data, it won't be too hard to eyeball the thresholds.

Here's an example: sort of



Obviously, you want more data points up high. That run was just me driving from my house to my office on the public roads. Second, you can see that the resolution of high speed datalogging isn't very good. pyxede 'old' style datalogging provides better (10 bit) resolution.

EDIT: here's a possibly better way of looking at the same data.



Well the important thing is to avoid knock while your data collecting. On 93, pulling boost back to spring levels (~11psi) might be enough.

d

 

If my given noise floor is indeed 26 as depicted by the SMART timing table, what is acceptable noise? Looking at my previously posted graphs, would you tune to keep the peaks under the happy line? You see that SMART and TIMING tables are pulling out over 4 degrees from 6800 to 7500. And at only 5400 and 5500 am I under the happy zone.

For the record, these runs were made as full 3rd gear WOT pulls. Thx for your help.

 

Try this:

Dump in 10 gallons of 100oct and redo your testing. This will essentially rule out detonation allowing you to get a very honest knock floor for pump gas testing/tuning.

 

Thx for the info. I will make a few more runs as the car stands now and fill up with 100 octane (When I find it). I will compare the results and report back.

Can someone answer my previous questions:

1. When Vishnu flashes a customer's stock ECU, are they adding timing advancements according to mod lists?

2. Will different setups have different noise floors? i.e. turbos, cams etc?

3. Would you tune to keep the peaks under the happy line?

 

Found a station within 15 miles that has 110 unleaded. On the way!!

 

Here's a run with 10 gallons of 110 mixed with 3-4 gallons of 93. Net Octane is about 105. This was another 3rd gear pull. Will perform some more testing later. The roads are a bit wet now. Notice the noise levels depicted so far even with higher octane. Boost is at 20psi.