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05-24-2011, 11:31 AM | #1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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ESS VT1-535 Review, Dyno, and Drag
A big thanks to Aleks @ Alekshop, Newtech, Roman and AJ @ ESS, and especially PencilGeek for taking so much time out of his busy schedule to analyze and organize the data.
I've had my VT1-535 for about 1,500 miles and I couldn't be happier. Power is smooth, linear, and scary. Cruising around town at low RPMs feels smoother than stock, opening up can be frightening experience especially at low gears. It's amazing how subtle and yet apparent the VT1-535 kit is, very befitting of the M3's Jekyll and Hyde image. The original purpose of the dyno was like anyone other dyno. I wanted to see how much power I was putting down, after seeing the results it snowballed into test after test, many late nights, speculation, theory crafting, and plans for even more tests... (Full list of mods at the end) Car and Modifications:
Dyno Results -- SAE Corrected: All Dyno Runs -- SAE Corrected: Boost and AFR for all Dyno Runs: Boost Log Analysis -- 5.6 PSI Average, 6.14 PSI Peak: Dyno Results -- STD Corrected: All Dyno Runs -- STD Corrected: Dyno Results -- Uncorrected: All Dyno Runs -- Uncorrected: The most interesting aspect of the tests were the boost data. The VT1-535 is rated for 4.5psi while the boost data was showing well above that at peak. Our first logical deduction was a wrong pulley, which proved to be false. The pulley was indeed 103mm. With this in mind we talked to ESS which assured us that the PSI generated is governed mechanically by the pulley. Looking back the dyno graphs, we noticed the odd behavior with the PSI graph as it was far from linear unlike many other dynos we've seen. When we compared the PSI graph with another car that was similarly modded we found a similar pattern. Newtech is a highly regarded and reliable shop for dynos in the North Bay area and assured us that the dyno boost gauge was correct and properly calibrated. Not satisfied, we started on our quest for more data. First, we put an analog boost gauge to measure. Unfortunately, as we approached 4.5psi and red line the gauge began to fluctuate widely and any real readings were impossible. Late, tired, hungry, and out of gas we postponed the second series of tests for the drag strip. Penicil Geek provided with a digital boost guage that would log at 10hz and vbox for the drag strip. For the record, this was my first time at a drag strip and made some stupid mistakes, mishifts, and generally embarrassed myself. PG even made fun of me for my shift times being so slow... The boost data we got from the drag runs were even a bigger mess... Not only did we notice that manifold pressure differed for each gear, Drag Run 3 and Drag Run 6 had no points at which the boost reached over 4.5psi... Run 6 was my fastest time... After talking to ESS again they said that peak boost can be skewed when the VANOS cam overlaps and agreed for the sake of data to input the boos data in the database as we saw it, 5.80 I am planning to return to the dyno mid June and will try a different digital boost gauge. If anyone has a better idea please tell us!!! Dyno Testing Procedures: After warming up the vehicle, we ran the dyno and let the car cool down one minute between runs. At the end of three runs, we turned off the motor, let the engine cool for ten minutes, then repeat the same testing procedure for three more runs. The next three runs were done 20 seconds apart. Therefore the last four runs were all done 20 seconds apart, and constituted our "heat soak" test. All of the dyno runs are filmed in HiDef video to document the authenticity and independence of the tests. A Kestral 4500 portable weather station is brought to take independent weather measurements. This provides a cross-check for the dyno weather station to ensure that the dyno weather station is reading accurately and has not been tampered or altered in any way. Individual Dyno Results: Individual dyno results are shown below. SAE corrected results are shown twice, using two different sources. The first source (djc) are the SAE corrected results straight from the Dynojet. The second source (sae) of SAE corrected results are obtained by using the Kestral 4500 weather station data for each individual dyno run and running it through an independent SAE correction formula. This ensures that the dyno results are accurate and can be independently audited and verified for authenticity and accuracy. The legend below has the following meaning:
In addition to running dyno tests, I had the opportunity to test the car on a drag strip. With the vBox strapped to the car, I ran the car from 0-130 MPH three times in each direction of the road. All of the odd runs (1, 3, 5) were run in the exact same location in one direction, and all of the even runs were run in the same location in the other direction. Running 0-130 MPH gives us both 1/4 mile results, and 60-130 MPH results as well. All of the vBox results were verified by www.perfdb.com. The 1/4 mile vBox results use the "NHRA Mode" calculations which have been proven to be very accurate when compared to actual drag strip time slip results.
Mods: ESS Tuning VT1-535 HRE R40 - Michelin Pilot Sport Cup Brembo GT 380mm Akrapovic Evolution Dinan Stage 1 Suspension RD Sports Front and Rear Sway Bars Euro Style Bumper Arkym Front Lip Rogue Engineering SSK BMW Black Chrome Front Grills BMW Black Chrome Side Gills BMW Performance CF Spoiler BMW LCI Tail Lamps Lux V3 LED Angel Eyes Alekshop Back-up Camera Valentine V1 Mirror Integration Center Console Wrapped by Alekshop Various coding by Alekshop |
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05-24-2011, 11:38 AM | #3 |
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looks good man hope your enjoying the car. be safe .
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Rs7 : 10.4 133.50 with a 1.7 60ft Toyo R888 F10 M5: 11.308 131.96 with a 1.9 60ft Street Tires E90 M3: 11.2 126.7 with a 1.8 60ft Street Tires |
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05-24-2011, 11:46 AM | #5 |
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05-24-2011, 11:46 AM | #6 |
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Great data. I can't wait to purchase this kit.
Call me crazy but 13.093 is the best 1/4 time? Seem high?
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05-24-2011, 11:48 AM | #7 |
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How many miles do you have on the kit before dynoing? It looks like the ECU has not fully adapted the WOT AF ratio and is still running in the default rich setting it comes with from us after reprogramming (for safety until it finalizes the adaptation process in the actual car). You should pick up substantial torque and power once the ECU adapts. If it does not adapt and AF ratio's do not go to mid 11's from 4500RPM and on, then you need to look into primary O2 sensor position or possibly replacing them.
Have you verified the AF ratio using another measuring device? It could be that the dyno AF sensor is off. Another AA car was dynoed on the same bench 24H earlier and also showed a very rich condition so this is very possible. |
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05-24-2011, 12:00 PM | #8 | ||
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Quote:
If you look at the graph you can clearly see where I botched shifting... Quote:
Last edited by mindless.spades; 05-24-2011 at 12:07 PM.. |
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05-24-2011, 12:29 PM | #9 | |
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It is also a strong possibility that the dyno AF ratio sensor is off since 2 car dynoed within 24H both show a richer than normal reading. |
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05-24-2011, 12:31 PM | #10 | |
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Your dyno #'s definitely suggest that you can do better. Enjoy your ride, sir.
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05-24-2011, 08:22 PM | #11 |
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Thanks for a very thorough and educational review. I love reading threads like this that are packed with very detailed and controlled data. This is my first time seeing a 'heat soak' of the ESS kit. Clearly, ESS has some great engineering skills to provide such a consistent kit!
Enjoy the car!!
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05-24-2011, 09:58 PM | #12 |
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those drag results are horrendous... especially for those dynos... most of those results are slower than a stock 335i
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05-24-2011, 10:12 PM | #13 |
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those 1/8 mile times are pretty weak. i put those kind of numbers down with just bolt on and tune and similar 60's.
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Rs7 : 10.4 133.50 with a 1.7 60ft Toyo R888 F10 M5: 11.308 131.96 with a 1.9 60ft Street Tires E90 M3: 11.2 126.7 with a 1.8 60ft Street Tires |
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05-24-2011, 10:13 PM | #14 |
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05-24-2011, 11:30 PM | #15 | |
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hopefully i can get a chance when school is done for me congrats on the results form the kit. enjoy in good health!
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05-25-2011, 02:07 PM | #17 | ||
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Hope you can get a blower on your car, I don't regret it one bit... though the GF does Quote:
The reason why we did so many tests and the drag run was trying to figure out why the boost was reading so high as it should be in the 4.5 range. Other similarly equipped cars showed it be around 4.5psi and the graphs didn't have a widely fluctuating pattern like on our dyno runs. At this point it's still inclusive as to what the exact boost is. The boost is governed mechanically but until we can verify it ourselves we're calling it as we see it. Temperatures held up fine and showed very consistent results during the heat soak tests which gives me peace of mind but I'm curious as ever. Hopefully, the next time we dyno we'll be able to confirm for sure. |
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05-25-2011, 02:15 PM | #18 | |
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i have no insight as to your issues, only commenting on the factual data you presented, and i commend you on that. |
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