[SILVY968]

Just wondering about potential gains. I have the airbox mod as well as the stage one chip. I plan to install the "gutted" resonator in the next couple of weeks.



If you should match air in with air out improvements and if you only open up the exhaust by modify the resonator so that it breathes better, what can you expect in HP and T gains?

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[flash]

most likely absolutely nothing - in fact you may well lose - unfortunately, on this engine, opening things up is NOT the answer it would be on other cars - the resonant induction intake manifold and the variocam make the pulse timing very difficult to work around, and make the requirement for maintaining back pressure very key in maintaining torque



to date there is no data to indicate that ANY cat-back system or any mod to the stock one does ANYTHING in the way of power gains - so far, we have only seen losses from most of them - there have been comments like "improved throttle response", but no power gains - systems with too little restriction result in serious torque losses



even pete has indicated that there are no hp gains to be had with his all by itself, though it does open the door for the intake and chip mods to be best taken advantage of, and better than the others - in other words, you will get more with the chip and airbox and his cat-back, than with the chip and airbox alone - things work in concert on this engine



i have heard that there are a couple of people who have had both the B&B and the RS Barn, and immediately noticed an improvement as soon as they pulled out the B&B and put in the RS Barn, which seems to bear out the torque losses pete has said he has seen on the dyno with the B&B



i have seen serious torque losses with other mufflers that had too little back pressure



do yourself a favor and do some before and after timed runs - some 0-60 and then some 40-80 in 4th gear would be good ones - this will give you real information on how the gutted resonator does - the sound could be very misleading in what it really does - the better tone could make you think you are going faster, because the engine sounds like it is, but in reality you might not be

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[Harvey]

[quote name='flash' date='Oct 8 2006, 03:11 PM']most likely absolutely nothing - in fact you may well lose - unfortunately, on this engine, opening things up is NOT the answer it would be on other cars - the resonant induction intake manifold and the variocam make the pulse timing very difficult to work around, and make the requirement for maintaining back pressure very key in maintaining torque



to date there is no data to indicate that ANY cat-back system or any mod to the stock one does ANYTHING in the way of power gains - so far, we have only seen losses from most of them - there have been comments like "improved throttle response", but no power gains - systems with too little restriction result in serious torque losses



even pete has indicated that there are no hp gains to be had with his all by itself, though it does open the door for the intake and chip mods to be best taken advantage of, and better than the others - in other words, you will get more with the chip and airbox and his cat-back, than with the chip and airbox alone - things work in concert on this engine



i have heard that there are a couple of people who have had both the B&B and the RS Barn, and immediately noticed an improvement as soon as they pulled out the B&B and put in the RS Barn, which seems to bear out the torque losses pete has said he has seen on the dyno with the B&B



i have seen serious torque losses with other mufflers that had too little back pressure



do yourself a favor and do some before and after timed runs - some 0-60 and then some 40-80 in 4th gear would be good ones - this will give you real information on how the gutted resonator does - the sound could be very misleading in what it really does - the better tone could make you think you are going faster, because the engine sounds like it is, but in reality you might not be

[right][post="26767"]<{POST_SNAPBACK}>[/post][/right][/quote]



I'm afraid that Flash may have a point. Go w/caution.



Harvey

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[firefish]

Opening up this ol' thread again.

Very interesting reading that have answered the questions I needed to have answers to before I could go ahead with my order to Pete for a stage 1 chip (and heat shield and short shift kit). I will mail him an order immediately after finishing this reply.

That the best chip available would seem to be the RS Barn (1,2 or 3) is pretty obvious. What is also obvious is that these engines are sensitive about back pressure and one must proceed with great caution when replacing the stock exhaust. Something that is also even more obvious is that I for one will not be able to buy a cat back from RS Barn in any foreseeable future (since shipping is a killer). I'd rather save the money 'til I can get a RSB header and make my own cat back for now. I am pretty good with the tig and I get the stainless plumbing for free, save for the muffler(s). I'm not really looking for any power gains by changing the exhaust, I'm more hoping for better sound and a substantial loss of weight, but I do not wish to lose any power. There must be some DIY design out there that at least doesn't ruin the performance, albeit not improving it save for losing some weight, that I can use?!?

Thx in advance.

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[flash]

you can probably figure something out with pete that supplies you the parts, less the tubing, if you are willing to get in there and bend up your own and weld it - that would reduce the package size, which would reduce the shipping a lot

mention it to him when you call him - he's probably got an idea for you

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[firefish]

Yeah, that might be a good idea if he is ok with it - I don't wanna cut any corners meaning that I perfectly understand that he (and you) need to get something back for all the time and effort put into R&D. Just feels like a waste of money to ship steelpipes across the Atlantic...

Anyway, exhaust is step two, first is to get the chip installed and then I'll take it from there.

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[Torbjorn968]

Early in the thread I read about "power pullies" in Flash´s car. What is this?

//T

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[xrad]

good question. Flash, do you still have the dual mass flywheel. I thought you switched it out for a lighter alu version. Did you also replace the front crank pulley? or just the parasitic pullies?

Just wondering how the crank harmonics are playing out......

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[flash]

this is now way off topic - this thread is about the rs barn software

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[Johannvb]

A friend of mine aske me a question about my RS Barn chip the other day and I don't have a good answer...and can't find one here on the forum.

The question is:

"Is the RS Barn Chip designed to run on 98 or 100 Octane fuel?"

I always run 98, but when I go into Germany for some fun on the ring or Autobahn I fill up with 100 Octane. But now am thinking that I could possibly get even more power if I have a chip that can work with these octanes. Otherwise I am just waisting my money putting in the high octane fuels.

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[flash]

as i remember when talking to pete about this some time ago, i believe it was 98 RON or 93 Ron+Mon/2 - he'll be back on tuesday and we can confirm this

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[firefish]

Just back after testdriving the car with new RS Barn stage 1 software. My oh my what a difference! Together with airbox and K&N the powercurve feels way smoother and I'm really enjoying the +7 grand shifts [img]style_emoticons/<#EMO_DIR#>/smile.gif[/img] How high is it safe to rev these babies assuming everything is ok?

The biggest gain seems to be in the mid range, or at lest the most noticeable gain anyway. All in all a very big difference, way more than I anticipated.

While working on the car I also fitted the heat shield and a new DME relay. Life is good.

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[94SilverCab]

I always seem to get this wrong, but the power curve ends at about 6,700...the balance of rev limit is for "over rev" conditions and will not add much to your performance.

Jay

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[flash]

i think that's pretty close to the peak power point for the stage 1 - i think the rev limiter is set to about 7300 or so on that chip

safe is a relative term - heat, fuel grade, humidity all play a part, as well as engine condition, oil type, oil condition, yada yada - belt condition will be key here, as well as variocam pads and chain

i have a different chip than the stage 1, which has a much higher rev limit, pulls all the way to about 7400 (there is other stuff contributing to that capability), but i rev mine to 7700 - 7800 pretty regularly, and hold it at 6500 a LOT - been doing that for a long time now - i don't think you will do any harm, based on things being in good shape, and revving it to the chip's redline on occasion and sustaining 6k for short periods - keep an eye on the temp gauge - it will tell you when you are working it too hard

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[ds968]

<!--quoteo(post=77306:date=Aug 10 2009, 01:52 PM:name=flash)-->QUOTE (flash @ Aug 10 2009, 01:52 PM) <{POST_SNAPBACK}><!--quotec-->i rev mine to 7700 - 7800 pretty regularly,<!--QuoteEnd--><!--QuoteEEnd-->

[img]style_emoticons/<#EMO_DIR#>/ohmy.gif[/img] get thee to a custom tailor right away for a snug straight-jacket and make a run to the nearest institution with padded rooms

whilst my chip goes to 7800 also, and I do shift at around 7000 to 7200 more often that I care to admit, revving at 7700 to 7800 regularly sounds pretty damn risky..

I once took it to 7800 where it actually cut off.. by a momentary lapse of reason while " in the heat of battle " but at that rpm the engine was screaming louder than a banshee being chased by a buffalo.. not a very comforting sound to hear out of your car, to say the least..

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[DaveN]

I was under the fear that the RSB stage 1 chip had the rev limit removed so I never tried to get near 7K for fear miss-shifting and pinning the needle. There is an upper limit on this chip?

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[flash]

yes - you can contact pete to see where it is for sure, but as i remember it was somewhere around 7300

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[Johannvb]

<!--quoteo(post=75994:date=Jul 23 2009, 04:40 PM:name=flash)-->QUOTE (flash @ Jul 23 2009, 04:40 PM) <{POST_SNAPBACK}><!--quotec-->as i remember when talking to pete about this some time ago, i believe it was 98 RON or 93 Ron+Mon/2 - he'll be back on tuesday and we can confirm this<!--QuoteEnd--><!--QuoteEEnd-->

Hey Flash,

Did you ever get an answer on this?

Thanks,
Johann

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[94SilverCab]

It was tuned to run on 93 Ron+Mon/2, I was at the dyno with him that day....

Regards,

Jay

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[rhudeboye]

<!--quoteo(post=77504:date=Aug 12 2009, 12:54 PM:name=DaveN)-->QUOTE (DaveN @ Aug 12 2009, 12:54 PM) <{POST_SNAPBACK}><!--quotec-->I was under the fear that the RSB stage 1 chip had the rev limit removed so I never tried to get near 7K for fear miss-shifting and pinning the needle. There is an upper limit on this chip?<!--QuoteEnd--><!--QuoteEEnd-->

Ditto. I assumed the same. And while thinking there's no safety net, I have been extra cautious of where my RPMs are when Im driving it hard.

If you called Pete please post the answer. If not I will call him tomorrow.

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