More Z06 intake testing and R&D....
05-16-2017, 08:04 AM
#181
Racer
BMS Intake
With the stock intake piping adjusting the filter base which is required to reduce the intake restriction has a significant effect on the MAF readings. Nothing that the long term trims can't compensate for, but in my opinion flow differences do not come in to play until higher loads where the reduction in restriction allows more engine boost.
You're not going to alter the engine's VE much at idle and low load operation with a high flow intake vs. stock. So you have roughtly the same volume of air going in the engine at low load, and any trim (MAF) variances are indicative of how the same volume of air is being sampled differently by each MAF/filter configuration.
You're not going to alter the engine's VE much at idle and low load operation with a high flow intake vs. stock. So you have roughtly the same volume of air going in the engine at low load, and any trim (MAF) variances are indicative of how the same volume of air is being sampled differently by each MAF/filter configuration.
05-16-2017, 11:06 PM
#184
Former Vendor
Thread Starter
05-17-2017, 07:54 PM
#185
Burning Brakes
Took a long drive with a lot of different throttle positions to log the stock filter Ltrims today. Installing BMS filter tonight and will repeat tomorrow. Peak boost was 9.5 - 9.7 psi. Maf peak was 70-71lb/mn
05-17-2017, 10:54 PM
#190
Former Vendor
Thread Starter
PS. On inlet temps make sure you have the right parameter, manifold temp.... It won't be 110 more like 140-160. 
05-18-2017, 07:05 AM
#191
Melting Slicks
05-18-2017, 08:23 AM
#192
Race Director
Member Since: Jul 2007
Location: Texas Hill Country
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05-18-2017, 08:52 AM
#193
Burning Brakes
Stock chart 20-40kpa to 2800 rpm. Seems rich from the factory. BMS filter almost balanced it out. But as the airflow increased the trims went positive 2ish at part throttle to 4400 rpm. Real question is at part throttle at 4000rpm with BMS is the airflow actually 3% more due to less restriction or is 3% of the airflow "missed" by the MAF ?
05-18-2017, 10:40 AM
#194
Former Vendor
Thread Starter
Stock chart 20-40kpa to 2800 rpm. Seems rich from the factory. BMS filter almost balanced it out. But as the airflow increased the trims went positive 2ish at part throttle to 4400 rpm. Real question is at part throttle at 4000rpm with BMS is the airflow actually 3% more due to less restriction or is 3% of the airflow "missed" by the MAF ?
05-18-2017, 01:50 PM
#195
Attachment 48094754
Your table in post 185 above is concerning.
There is no reason a stock car running a stock tune should be showing LTFT's as high as yours???
Your car is pulling as much as 13% fuel at part throttle.
Indications are this car has a small problem that would cause to much fuel to be added.
http://www.easterncatalytic.com/educ...agnostic-tool/
Your chart after the filter install is closer to what a normal Z06 looks like.
As you can see my scan of a stock Z06 M7 is very close to what you all are seeing with the BMS filter.(~1-2% difference).
I mostly look at 40KPA where we know the engine is under some load for any comparison purposes. Because a stock car idles at 30-35KPA.
My point here is there is likely something amiss with the car in your baseline screenshot.
Anything above 5ish or so LTFT's is probably not normal for a stock Z06 regardless of KPA.
There is no reason a stock car running a stock tune should be showing LTFT's as high as yours???
Your car is pulling as much as 13% fuel at part throttle.
Indications are this car has a small problem that would cause to much fuel to be added.
http://www.easterncatalytic.com/educ...agnostic-tool/
Your chart after the filter install is closer to what a normal Z06 looks like.
As you can see my scan of a stock Z06 M7 is very close to what you all are seeing with the BMS filter.(~1-2% difference).
I mostly look at 40KPA where we know the engine is under some load for any comparison purposes. Because a stock car idles at 30-35KPA.
My point here is there is likely something amiss with the car in your baseline screenshot.
Anything above 5ish or so LTFT's is probably not normal for a stock Z06 regardless of KPA.
Last edited by dar02081961; 05-25-2017 at 11:19 AM. Reason: Incorrect diagnosis for negitive LTFT, corrected with reference
05-18-2017, 02:00 PM
#196
Stock chart 20-40kpa to 2800 rpm. Seems rich from the factory. BMS filter almost balanced it out. But as the airflow increased the trims went positive 2ish at part throttle to 4400 rpm. Real question is at part throttle at 4000rpm with BMS is the airflow actually 3% more due to less restriction or is 3% of the airflow "missed" by the MAF ?
05-18-2017, 03:51 PM
#198
Burning Brakes
Some HPT Logged data between stock and BMS.
Rpm 5500-6200
Stock timing 21 to 24 zero kr
BMS timing 22 to 24.5 zero kr
(I have a wideband but it is not installed these are FWIW)
B2S1 O2 Stock 913 to 918
B2S1 O2 BMS 898 to 903
MAF Flow stock 62 to 71.3
Maf Flow BMS 56 to 63.4 (Definitely leaning the AF)
Stock Boost peak 9.7psi
BMS Boost Peak 10.1psi (Definitely removing restriction)
BMS drives great. Trims logged above aligns with this data.
Green Filter next up tonight.
Rpm 5500-6200
Stock timing 21 to 24 zero kr
BMS timing 22 to 24.5 zero kr
(I have a wideband but it is not installed these are FWIW)
B2S1 O2 Stock 913 to 918
B2S1 O2 BMS 898 to 903
MAF Flow stock 62 to 71.3
Maf Flow BMS 56 to 63.4 (Definitely leaning the AF)
Stock Boost peak 9.7psi
BMS Boost Peak 10.1psi (Definitely removing restriction)
BMS drives great. Trims logged above aligns with this data.
Green Filter next up tonight.
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Larry M (05-20-2017)
05-18-2017, 06:01 PM
#199
Some HPT Logged data between stock and BMS.
Rpm 5500-6200
Stock timing 21 to 24 zero kr
BMS timing 22 to 24.5 zero kr
(I have a wideband but it is not installed these are FWIW)
B2S1 O2 Stock 913 to 918
B2S1 O2 BMS 898 to 903
MAF Flow stock 62 to 71.3
Maf Flow BMS 56 to 63.4 (Definitely leaning the AF)
Stock Boost peak 9.7psi
BMS Boost Peak 10.1psi (Definitely removing restriction)
BMS drives great. Trims logged above aligns with this data.
Green Filter next up tonight.
Rpm 5500-6200
Stock timing 21 to 24 zero kr
BMS timing 22 to 24.5 zero kr
(I have a wideband but it is not installed these are FWIW)
B2S1 O2 Stock 913 to 918
B2S1 O2 BMS 898 to 903
MAF Flow stock 62 to 71.3
Maf Flow BMS 56 to 63.4 (Definitely leaning the AF)
Stock Boost peak 9.7psi
BMS Boost Peak 10.1psi (Definitely removing restriction)
BMS drives great. Trims logged above aligns with this data.
Green Filter next up tonight.
05-18-2017, 06:04 PM
#200
Burning Brakes
Can not really believe a narrow band at wot. They just show that "directionally " it is leaner. A wideband is needed for an actual value to answer your question. No doubt it is leaner than stock.