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07-12-2013, 11:16 PM | #1 |
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ESS 625 pulley swap results! Dyno inside
Well, a few of you may have seen a previous post about my rant on elevation and boost up here in Colorado. We definitely get shafted out of a lot of power, so myself and Andrew @ AR Design started going back and forth with ideas to compensate for the drop of static compression and air density. After throwing some ideas around we decided to drop pulley sizes, and ended up doing so twice.
Here is the sheet from the supplied ESS 625 3.8" pulley. Compared to my run when the car was full exhaust, intake. We saw a decent jump from 345 to 526 wheel hp (corrected mind you) This was on 6psi peak. After seeing corrected numbers (low 400 wheel) and the car feeling lackluster for being supercharged, we decided to throw around some options and did some research and spoke with some tuners. We opted for a slightly smaller pulley and wanted to see how the DMU would react with fuel. We dropped from the 3.8" to the 3.6". We saw an increase of boost from 6psi to 7psi and power went from 526 to 565. Fueling was consistent and safe (11's) across the board with AFR's. Well, since we found out the DMU would auto compensate (not sure if this is factory, or a byproduct of the ESS 625 tune) we decided to take a leap of faith today. We bumped down from the 3.6" to a 3.2" pulley. Boost raised from 7psi to 9psi and once again, the DMU compensated fuel and she was sitting around high 11's AFR through the power. Power jumped from 565 to 613 and it was hot as hell out today. Very happy with results. Next step, we are overhauling the intercooling system with a trunk mounted reservoir and a larger heat exchanger. Here is a dyno with a run when i first got her, 100% bone stock vs how she sits today at 9psi
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07-12-2013, 11:22 PM | #2 |
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Great. I guess it's time to change the rod bearings with that much boost. Great whp numbers. I'm Gona try swapping mine out.
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07-13-2013, 12:21 AM | #5 |
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great corrected numbers. Whats your uncorrected number though? That number will tell you whether you're in dangerous territory or not.
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07-13-2013, 12:28 AM | #6 | |
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Uncorrected numbers are 494hp and 317tq on 9psi. I hate Colorado so much. Andrew wants to go even smaller on the pulley and ramp boost to 11-12psi since we still havent even come close to hitting what guys at sea level are uncorrected.
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07-13-2013, 12:43 AM | #7 |
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If you're never going to drive the car at a lower altitude, then go for it!
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07-13-2013, 12:58 AM | #8 |
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My concern is the 12:1. I know static compression is lower at 6k elevation, but running 10+ psi on the 12:1 block would throw alot of stress on her, even if the uncorrected numbers are still lower then 625 guys at sea level. If I am wrong about this, and I can infact safely push her to 550 uncorrected then I would love to. Any engineers/tuners care to chime in here????
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-08 E92 Brushed Steel DCT- KW V3's - AR Design - Volk TE37 - Vorsteiner - ESS/AR 700 -2012 GTR Premium- Jacks 3.8 - Jacks Drag 800 w/ billet gears - AAM GT-900R - Swift - DPE ST7's - Ecutek via Visconti - 9.4 @150mph 7200ft DA - 185.5mph 1/2 mile 9240ft DA |
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07-13-2013, 09:44 AM | #9 | |
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By simply lowering the diameter of the SC pulley to increase boost you have reduced the traction of the belt which will eventually cause the belt to slip. This is often the case over time as the belt stretches from wear. On the VT2-650 kit which runs 8 psi we designed a custom crank pulley so that a larger diameter pulley can be used on the SC allowing for proper belt drive traction. We have had several customers over the years modify our kits to add more boost than the kit was intended to run and more than the motor can safely handle. Software and motor safety in almost all of these cases was overlooked as most do not feel it is important as long as the car is making power. While the initial results were positive and the cars made a lot more power the end results often ended in damaged motors. I will tell you the same thing I tell every customer who wants to modify our kits and experiment with their motors. Make sure you have enough money to buy a new motor if things go wrong. If you do and putting a new motor in your car is not a big deal for you then do what you want. |
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07-14-2013, 05:34 PM | #10 | |
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I understand what you're saying, but keep in mind, the stress/power differential at altitude is substantial. Guys at sea level making 550-600 UNCORRECTED wheel with these kits, while me at 9psi, I am still in the 400's uncorrected. There is substantially less stress being throw at my engine comparatively.
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07-14-2013, 06:04 PM | #11 |
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And here is an overlapped dyno of the ESS 625 "factory" 3.8 vs 3.6 vs 3.2 pullies
A solid 89hp and 51tq jump from 3psi increase.
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07-14-2013, 06:57 PM | #12 |
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Nice delta for sure. I really hope the higher altitude is relieving the stress from the higher boost.
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07-14-2013, 07:00 PM | #13 |
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I would imagine so, considering my 613 corrected is still in the 400's corrected at 6000ft elevation. I don't think I would ever be able to get similar uncorrected numbers (compared to the sea level 625 guys) up here with this blower.
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07-14-2013, 07:11 PM | #14 |
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Sick!
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07-14-2013, 08:03 PM | #15 | |
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but its really beyond me how people are not satisfied with the kits as is. (not talking about OP) Last edited by Ezio; 07-14-2013 at 08:16 PM.. |
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07-14-2013, 08:06 PM | #16 |
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Car is running perfect so far. Pulled plugs before pulley swap and they are spot on. Zero timing abberations on dyno. It is extremely smooth. Will post timing log as soon as Matheo gets to it. Any time you modify an off the shelf kit, you are on your own. We certainly would not blame ESS for any issues that arise from our tweaks. But thus far results of our modifications speak for themselves. Our next step is to improve the cooling for the blower as we feel there is plenty of room for improvement.
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07-14-2013, 11:11 PM | #18 |
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Wow not only deleting my posts, but Roman's as well?
In that case... Maybe you should at least put a secondary air filter on your recirc valve hose that's disconnected. Otherwise enjoy the power now, because all the road debris youre sucking into the supercharger from the engine bay will lower your compression in no time. The hacks at AR may not recommend it because they also think it sounds cool, but it'll kill that engine along with the inning issues you're creating. |
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07-15-2013, 12:30 AM | #19 |
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The weather station on this dyno is broken. If you look at the ambient pressure for your stock and 614whp runs, the dyno weather station shows 915mBar and 848mBar respectively. Both of those numbers are not possible on planet earth without being inside a tornado. So that's a sign that the dyno weather station is broken. Typical numbers will be 990 - 1030 mBar.
Because of the bogus weather station, your horsepower correction is way off too. The dyno calculated 24% correction, which is far outside of the 7% allowable specification. It looks like the real pressure at your location that day was about 1008 mBar. That would put your dyno correction factor at 4.61%, and your corrected horsepower around 517whp (assuming 494whp uncorrected is accurate). See if there's another dyno in the area. If your uncorrected numbers are the same, then in order to use results from this shop, you'll need to get your own weather data from another source and calculate the horsepower correction by hand (or web sites will do it for you). |
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07-15-2013, 01:04 AM | #20 |
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Andrew from AA once stated that its not the psi that blows the engines but the horsepower
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07-15-2013, 03:41 AM | #21 | |
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4% correction...... in Colorado.... when the DA was over 8900...... I don't think so Tim.
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07-15-2013, 03:44 AM | #22 | |
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