06-09-2015, 12:13 PM | #24 |
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Here is a few clips my car w/ Eisennman Race Mufflers, Eisennman Mid-Pipes, and Motive Concepts Catless DPs.
Revving... http://scontent.cdninstagram.com/hph...83059751_n.mp4 Downshifting into 1st... https://scontent.cdninstagram.com/hp...25030718_n.mp4 1st to 2nd to 3rd... https://scontent.cdninstagram.com/hp...79627241_n.mp4 Brian
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/// 2o13 m6 f13 . jb4 tuned . meth injected . msr intake . 21" adv1 wheels . eisenmann race w/ catless DPs . vorsteiner full aero . accuair e-level w/ bagged KW V3 struts . dinan sways . bel stir+ w/ alp jammer . jl audio subs
/// 2o13 x5m e70 . velos tuned . 22" adv1 wheels . dropped on kw variant3 coilovers . passport 9500ci radar & jammer. gets groceries fast |
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06-09-2015, 11:33 PM | #25 | |
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Ok. 1500 km till I go cat less and then will see about the eisenmann!!! Wow, it sounds crazy dude!!! |
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06-10-2015, 07:03 PM | #26 | |
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Brian
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/// 2o13 m6 f13 . jb4 tuned . meth injected . msr intake . 21" adv1 wheels . eisenmann race w/ catless DPs . vorsteiner full aero . accuair e-level w/ bagged KW V3 struts . dinan sways . bel stir+ w/ alp jammer . jl audio subs
/// 2o13 x5m e70 . velos tuned . 22" adv1 wheels . dropped on kw variant3 coilovers . passport 9500ci radar & jammer. gets groceries fast |
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06-15-2015, 02:09 AM | #27 |
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I have supersprint catless down piles akropovic evolution and MSR intake. Sounds amazing. My CEL didn't come on for a week but now I need software to get rid of the light. I have been using the BMS piggyback and have some awesome gains as far as the seat of your pants dyno. Going to have a few pulls done at Elite this coming week to see where we can go from here. Car sounds amazing and spools insanely fast.
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06-15-2015, 04:29 AM | #28 |
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All the positive responses are interesting and I say that as when I had my 6 remapped there was a guy there who did all the custom turbo builds for them (separate company) and he was adamant that going catless was a bad idea as the car would overspool top end and cut out/damage the engine, and that low down the lack of back pressure would cause a drop in low down torque..... I'm an engineer by background and that didn't make to much sense to me but he seemed to know his turbos and was quite clear...?
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06-15-2015, 08:19 AM | #29 | |
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Not knowing BMW tech I can't say for sure, BUT they have introduced a mod to the feeder pipes. EDIT: I should have added with a re-map + catless additional boost will also cover the bottom end. I got 10/15 extra Ft/Pounds at the bottom from my B7 RS4 with catless DP and STD Exhaust valves wired open.
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06-16-2015, 08:42 AM | #30 | |
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I have to ask, did he recommend replacing the turbo's on your M6? Yes these are very complicated engines ... but I am going with the advice of my BMW Dealer who will also warantee what they do to the car for mods. The advice my BMW Dealer has, was at 2000 km we are going catless and Dinan tune so Turbo's and Emissions are not an issue just my thoughts from my talks and mods in the past. I must qualify that I am not an Engineer or Mechanic ... just a Car Guy.
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06-16-2015, 02:11 PM | #31 |
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The guy who commented about not going Catless had no offerings for the M6 and was not selling anything. We were just chatting over a coffee whilst my car was being worked on as he had picked up some bits and was about to leave. Interesting that someone else has said the same sort of thing now. Most likely go for sport cats although they are very expensive here in the UK.
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06-16-2015, 10:20 PM | #32 | |
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Thanks for the feedback! Sport Cats ... how much of a difference/less back pressure do we get compared to stock and compared to catless? Also ... LETS ASK BIGBRIAN RE HIS CAR!
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06-16-2015, 10:24 PM | #33 | |
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BIG BRIAN!!! WHAT HAVE YOU TO SAY RE GOING CATLESS WITH ALL YOUR MODS AND TUNING? Advice based on your experience with your car? 1200 km now ... 800 more till catless with super sprint down pipes and DINAN Tuning!
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06-17-2015, 12:59 PM | #34 | |
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As for performance... It's hard to say if it affects performance or not. Without any other mods I doubt catless downpipes will help in the hp/torque department. Catless downpipes could come into play with other mods used in conjunction w/ the catless downpipes. Then again without apples to apples comparison (same dyno, same fuel, same temp, etc) it's going to be hard to say for sure. Unless these turbos were specifically designed to be used in conjunction with back pressure I don't see how it can cause harm. You have turbo cars pushing 2,000 - 3,000 horsepower and they don't have an exhaust that creates back pressure. So why would it causes these specific turbos harm? Just my 02 cents though so take it for what it is. Brian
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/// 2o13 m6 f13 . jb4 tuned . meth injected . msr intake . 21" adv1 wheels . eisenmann race w/ catless DPs . vorsteiner full aero . accuair e-level w/ bagged KW V3 struts . dinan sways . bel stir+ w/ alp jammer . jl audio subs
/// 2o13 x5m e70 . velos tuned . 22" adv1 wheels . dropped on kw variant3 coilovers . passport 9500ci radar & jammer. gets groceries fast |
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06-17-2015, 09:55 PM | #35 | |
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I WILL CARRY ON RE THE CATLESS ... AND THEN PERHAPS THE EISENMAN MUFFLERS!
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06-19-2015, 09:24 PM | #36 | |
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06-20-2015, 03:46 AM | #37 | |
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HP is generally taken as engine crank power, Bhp is what you get at the wheels after all the losses. It's all bollocks anyhow as HP is a calculated figure taken from the torque measured along with peak rpm. I just know it's very fast throught the gears and I've had some heavily modded cars and bikes (last Hayabusa pulled 439bhp!). |
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06-20-2015, 07:23 PM | #38 | |
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Also, it is important to note that the Torque and HP are equal at 5252 RPM (5252 RPM / 5252 = 1). If they do not there is something wrong. I suspect it is with the way your car is hooking up to the dyno; a tire to chassis roller contact problem. Most likely I would think something is slipping. Add some weight to the trunk and see if something changes, but it might take a lot of weight - I've heard of instances where several guys got up in the trunk but I would not recommend that - there's a lot of power going on and if something breaks or slips humans don't fair too well in interactions with heavy chunks of metal that have lots of velocity or energy behind them. Anyway, I would question the results of any dyno run that did not have the torque and hp reading the same number at 5252 RPM. It is contrary to the mathematical relationship of hp and torque. I used to run an engine dyno and did a lot of this for several years. I am not that familiar with chassis dynos. I have used them a couple of times but I was only an observer - they were measuring my car and I was doing some tuning, not running the dyno. I know that there are indeed losses in the drivetrain that make the power measured at the drive wheels lower. A lot of people here talk about wheel horsepower. It is the effective power you end up with but I am not so sure the difference between bhp and whp is such a big deal - after all, the drivetrain losses are going to be there no matter what you do to the engine. A big reason a lot of people use chassis dynos is the ease of using them, especially relative to an engine dyno. If you've never worked an engine dyno just look at your engine compartment and you'll get an idea how much harder it is to use one. All that stuff in the engine compartment that makes the engine function has to be removed from the compartment, installed and made functional on the dyno too or replicated on the dyno stand. In the case of the S63TU engine, think intercoolers, oil coolers, a lot of those pumps that these systems use, etc. It'd be close to a nightmare building all that gear, not to mention getting sufficient cooling air running through all those heat exchangers - that would take one serious fan. On a chassis dyno you just drive up on the rollers, put a fan in front of the radiator, tie the car down (so that if something bad happens at max RPM and WOT it doesn't take off) and have at it. Much simpler indeed, and it takes a lot less time to make it happen. Plus it's easier to measure changes. Say a few weeks after you do an engine dyno you come up with a new idea or part to try, you have to pull everything out and recreate the engine dyno setup again. This can take days. In the same scenario with a chassis dyno, a few weeks later you just drive up on the rollers, get the fan, strap the car down and have at it. Still much simpler. I think the advantage of the engine dyno is you remove some of the variables that can be introduced by the drivetrain, and especially the contact friction of the tires on the rollers. For our purposes though (we are trying to go fast and don't need extremely accurate numbers) a chassis dyno is great. What we are after is indeed that seat of the pants feel (I think of that line in the movie Rush where Niki Lauda meets his future wife and tells her why he is such a good F1 driver - "I've got a good ass") and what we can find out from a stopwatch. Last edited by chask; 06-20-2015 at 10:27 PM.. |
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06-20-2015, 11:34 PM | #39 |
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Were you bored.....
Generally in the UK BHP is the wheel horse power you have and HP is the show off calculated higher crank Horse power you have. On the dynos we use you get a SHP which is shoutout horse power (calculated crank) which is what people here like to throw about as its higher. |
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06-21-2015, 12:18 AM | #40 | |
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All Dyno machines are different and put out different ratings. I've seen a Dyno read 620whp where another Dyno (same car) reads 710hp. You Need to go by the baseline and the final number to understand the actual gain. You can get ~100whp with an aggressive tune with intake/exhaust done on the car. Anything more than ~100whp requires modified turbos. Someone saying they obtained 200whp on a tune alone is full of shit. Just sayin. Brian Last edited by bigbrian; 06-21-2015 at 12:27 AM.. |
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06-21-2015, 01:08 AM | #41 | ||
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Brake horsepower (bhp) Horsepower at the output shaft of an engine, turbine, or motor is termed brake horsepower or shaft horsepower, depending on what kind of instrument is used to measure it. It is the measure of an engine's horsepower before the loss in power caused by the gearbox and drive train etc. https://en.wikipedia.org/wiki/Horsep...ower_.28bhp.29
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06-21-2015, 07:17 PM | #42 | |
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06-22-2015, 08:40 AM | #43 | |
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What tuning did you do after going Catless to eliminate the CEL from going on. My dealer is planning on doing the Dinan tune I am at 1500 km ... 500 km more till the supersprints go in and Cats come out! Can't wait! Sunny Tatra
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06-22-2015, 10:27 AM | #44 | |
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Once my new turbos are built I will be having EuroCharged in Houston do an ECU tune on my car that will remove CEL. Brian |
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