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04-02-2013, 10:11 PM | #1 |
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ESS 625 Pulley Swap
So I swapped out the standard 96mm pulley with a 92mm pulley to see how much power increase it would yield. Well, basically it didn't do much. It did increase boost by about 1psi...so instead of a measly 5.2psi I'm getting around 6psi. Still much lower boost than everyone else who has this kit but ironically it's make more power than most as well so I'm not complaining. I'll keep the pulley on for the upcoming Shift S3ctor roll-on event but it's coming off since I can't run this pulley with 91 octane.
Just goes to show that the kit is already optimized for the 625 adaptive software. Here's an overlay of two of my dyno runs today with a dyno I did back in February with the 96mm pulley. Blue and Red runs were from today's dyno and the green run was back in Feb with the 96mm pulley.
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04-02-2013, 10:49 PM | #2 |
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why is your car running such low boost? I thought that the size of the pulley dictates what PSI is generated.
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04-03-2013, 12:13 AM | #4 |
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Very nice and consistent dynos - your car was a beast at the last event.
What kind of numbers does this translate to SAE wise? I was under the impression that SAE was the industry standard for dyno data but please correct me if I'm wrong as I am a little new to the dyno world. That 8600rpm redline must be fun!
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04-03-2013, 11:06 AM | #5 | ||
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04-03-2013, 11:08 AM | #6 |
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Bottom line is that the upgrades to the 8,600 RPM tune and a smaller pulley were worth only 5-10 HP and probably aren't worth it to most since it voids the ESS warranty. I like the flexibility of the tune and typically try to shift around 8,300 to 8,400 RPM at the roll-on events which gives me some room for error to prevent hitting fuel-cut off which completely botches any acceleration run. Another reason for keeping the revs at 8,400 is that it starts getting a little lean at the very top which means I'm running at the limit of the fueling capacity.
Cheers.
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04-03-2013, 11:15 AM | #8 |
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Nice! can't wait to see how the new set up goes this weekend at your event!
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04-03-2013, 11:49 AM | #9 | |
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SAE is a standard horsepower correction governed by a standards body. It is documented in SAE-j1349. This has been the standard since 1990. STD has multiple definitions and hence is harder to track down. Some calculate STD as SAE-j607. J607 was adopted in 1974 and did not account for friction loss...hence gives higher results than j1349. Others calculate STD as the original j1349 from 1990 using 60 degrees and 1013mb pressure as reference. However in 2004, j1349 was updated to 77 degrees and 990mb pressure reference. So STD-1349-1990 also gives higher results than the 2004 update. EDIT: I just checked and my SAE RWHP is lower by 15.
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04-03-2013, 12:00 PM | #10 |
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My p3 vent gauge showing 6.8 psi on a 540 vf kit with 508 whp. ESS 620 kit runs less psi with a smaller pulley? Hmm. Something is off them. Either my gauge or your gauge is not registering correctly. I also was under the impression that pulley size controls running speed of the blower which reflects on boost pressure
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04-03-2013, 12:10 PM | #11 | |
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Funny thing is that their boost measurements appears to be correct for every other 625 kit they have dyno'd and measured boost for. You can see the boost graph above...actually not even 6psi...maybe 5.5 to 5.75 before it spikes up when the throttle is closed. I wish I had a good answer.
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04-03-2013, 12:23 PM | #12 | |
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04-03-2013, 12:28 PM | #13 |
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Odd that you are making such high HP with that low of a boost reading. Have you checked your boost on a second gauge other than the EAS one for reference?
I would imagine that you would need the VT2-650 software and injectors to take full advantage of a smaller pulley. Im sure just adding more boost to any kit will net some power but there are other factors that contribute to making additional power and doing it safely. |
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04-03-2013, 01:16 PM | #14 | |
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04-03-2013, 02:16 PM | #15 | |
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04-03-2013, 02:33 PM | #16 |
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The injectors for the 625 and the 650 are the same, aren't they? According to the ESS site the 550 has "spec 1" injectors, 585 "spec 2" and the 625/650 "spec 3"
I thought the 650 also used a custom crank pulley though in addition to the blower pulley. |
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04-03-2013, 02:35 PM | #17 | |
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Edit: Saw that Longboarder has already replied.
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04-03-2013, 03:08 PM | #18 |
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Reason you have such low boost is due to the free flowing exhaust. The less restriction you have in the exhaust the less boost the car will register. If you installed a factory exhaust with cats you would pick up some boost.
People forget the pressure is not the metric the engine cares about, it's all about air flow. Also you probably picked up a decent amount of power, you just can't compare the runs from few months ago because the air conditions have changed. You should of dynoed before and after on same day to verify gains. |
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04-03-2013, 03:15 PM | #19 | |
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In my case, the change in exhaust did nothing to change the boost as I have dyno'd with the stock exhaust with the blower. Same boost as compared when I dyno'd the day after I had the MRF catless mid-pipe and Akra slip installed. The boost didn't change much but I did pick up quite a bit of power overall, particularly low in the rev range where the S65 needed it most. Temp/humidity was different, but it was factored in for the STD RWHP results.
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04-03-2013, 04:45 PM | #20 | |
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04-03-2013, 07:31 PM | #21 |
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We also use a different injector on the 650 than the rest of the lineup. The increase in boost is part of what adds power but the 650 software is very different than the 625 software. VT2-625 is your best all around setup if you want very good power on the stock motor IMO. The VT2-650 is very dependent on fuel quality as it maxes out the stock motor and fuel system. The 650 kit was designed for customers who want to squeeze every last HP out of the stock motor and are ok with pushing limits. It is also meant for customers who understand that you have to use the product as designed due to the added stress it puts on the motor.
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04-03-2013, 08:49 PM | #22 |
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25HP is the difference between daily drive safe and every last ounce of the motor? That seems a bit scary, especially as I am eyeing this 625 system.
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