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      12-18-2012, 09:12 PM   #1
capri
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Do you need a tune with a catted downpipe ?

Thinking of buying a catted downpipe, do i need a tune ? will this cause an engine check ?
the rest of the exhaust will be changed as well. Intake too.

Thanks.
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      12-18-2012, 09:33 PM   #2
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Probably depends on what cell it is. Alot of high flow cats will still fail the internal check
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      12-18-2012, 10:01 PM   #3
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It's pointless to add downpipes and an intake on this car or any car for that matter without a tune. The stock parts are more than adequate for the stock tune. You will not see any added power with just changing out the stock parts without tuning, hell you'll probably lose power installing an intake without tuning for it.
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      12-19-2012, 01:10 AM   #4
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Quote:
Originally Posted by ErvGotti View Post
It's pointless to add downpipes and an intake on this car or any car for that matter without a tune. The stock parts are more than adequate for the stock tune. You will not see any added power with just changing out the stock parts without tuning, hell you'll probably lose power installing an intake without tuning for it.
It's not pointless to put on a catless downpipe. I think Vishnu claims like 10-15 at the wheels untuned. I have the catted version on my car and it reduces spool time. Besides, it sounds wicked. I didn't necessarily want to tune my car yet and I like the exhaust tone. Aside from the cel light I haven't seen any downsides.
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      12-19-2012, 04:50 AM   #5
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Fully agree, one of the big advantages of downpipes is that the turbo can spool quicker, and you will get this advantage regardless of whether you are tuned or not.
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      12-19-2012, 07:04 AM   #6
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Quote:
Originally Posted by ParkNuts View Post
It's not pointless to put on a catless downpipe. I think Vishnu claims like 10-15 at the wheels untuned. I have the catted version on my car and it reduces spool time. Besides, it sounds wicked. I didn't necessarily want to tune my car yet and I like the exhaust tone. Aside from the cel light I haven't seen any downsides.
Have you Dyno'd it? Have you done a Vbox pull or 1/4 mile pull between stock and modded. A lot of manufactures claim gains to sell products. If you search around the forums you'll see that there is no gains to be had unless your tuned. Especially an intake.

You might gain a split second of spool up with catted DP's vs stock and better sound but I can guarantee you, you are not gaining 10-15 WHP without a tune.
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      12-19-2012, 08:44 AM   #7
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There's definitely an increase in power in the midrange with putting on a dp without a tune. Its not arguable like an intake on our cars, there's definitive proof in dyno sheets all over the place. I got one mostly for the increase sound from the exhaust, but there was a very noticeable increase in power driving on the street. And on track my car increased 4-5 mph trap speed on the straights. Aside from the CEL, there are no downsides. To fix the cell you can get the burgertuning Can tool to block it. Thats what I run.
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      12-19-2012, 09:26 PM   #8
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Quote:
Originally Posted by Focusedintntions View Post
There's definitely an increase in power in the midrange with putting on a dp without a tune. Its not arguable like an intake on our cars, there's definitive proof in dyno sheets all over the place. I got one mostly for the increase sound from the exhaust, but there was a very noticeable increase in power driving on the street. And on track my car increased 4-5 mph trap speed on the straights. Aside from the CEL, there are no downsides. To fix the cell you can get the burgertuning Can tool to block it. Thats what I run.
You serious 4-5 MPH pick up without a tune and just DP's. You'll have to pick up at a minimum 30-40 HP to gain that much in trap speed, You are not getting that with just DP's and no tune. These cars typically trap around 104-106 MPH stock and most people FBO, tune, no meth or E85 trap around 110-114 MPH. That usually puts them at 370-380 WHP from 270 WHP stock.

Just use this calculator enter the average weight of our car around 3450, it'll show that a car with 300 hp traps 104 MPH which like I stated is the average of our cars. Now go up the graph to 108 MPH trap speed and you'll have to pick up 40 HP. Like I said not gonna happen with DP's without a tune.

http://www.ajdesigner.com/fl_horsepo...trap_speed.php

I'm not against DP's if you all want to run it without a tune by all means go ahead. Maybe you like the sound or maybe your getting a tune in the future, but I still believe Catted DP's will provide only a minimal gain over the stock DP's until you add a tune.
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      12-19-2012, 09:48 PM   #9
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Quote:
Originally Posted by Focusedintntions View Post
There's definitely an increase in power in the midrange with putting on a dp without a tune. Its not arguable like an intake on our cars, there's definitive proof in dyno sheets all over the place. I got one mostly for the increase sound from the exhaust, but there was a very noticeable increase in power driving on the street. And on track my car increased 4-5 mph trap speed on the straights. Aside from the CEL, there are no downsides. To fix the cell you can get the burgertuning Can tool to block it. Thats what I run.
Was your 60ft the same before and after installing downpipes? People usually gain about 1-2mph trap speeds from downpipes when used in conjunction with a tune.
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      12-19-2012, 11:43 PM   #10
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he said on the straights, which suggests that he's talking about road racing, not drag racing. Totally different.
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      12-20-2012, 12:11 PM   #11
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he said on the straights, which suggests that he's talking about road racing, not drag racing. Totally different.
Bingo...i'm talking about road course...I don't do the drag thing as it's too easy, quick, and boring really...and it's a ton of abuse on a drive train.

There's a huge gain in the power of the midrange of the n55 motor with the catted dp. Enough that you will definitely encounter traction issues in 2nd gear at about 25mph here in the winter time when rolling onto the gas where as before there were none.
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      12-20-2012, 12:12 PM   #12
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Keep in mind that my 135 with just a dp kept even and pulled a little on an n54 jb4 tuned 335 up to about 150mph...
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      12-20-2012, 07:56 PM   #13
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Quote:
Originally Posted by gwhiz View Post
he said on the straights, which suggests that he's talking about road racing, not drag racing. Totally different.
But on a road course that could be contributed to better exit speed and grip than the DP's themselves. That's why to me that observation is irrelevant when talking about making power with catted DP's without a tune. The best way to judge a power mod is either a Dyno with a baseline or 1/4 mile times.
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      12-25-2012, 06:22 PM   #14
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With so many dp available for the N55, which one do i buy ? I have a BMS intake & the Berk Street performance exhaust installed soon. (components after the downpipe all the way to the catback.)
Thanks for the help.
Also,does the different make of down pipe out have different signature sound ??
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