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crm
Dodge Dakota
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6/10/2002
14:25:46
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 Subject: High-flow cat ?'s
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hello all,
i am thinking about getting a high-flow cat for my 2001 QC (4.7L auto). it has 2 pre-cats and then a main right before the muffler. couple of things i need to find out first:
1. am i going to lose any low-end with a high-flow cat? i just got the exhaust done with 2 1/2" to flowmaster, dual 2 1/4" out. i am just concerned about opening it up too much and losing that off-the-line power.
2. should this be installed prior to or after a new TB from Fastman? (installed 3" Z tube friday night) again, i wanna make sure i balance out
everything as good as possible to maintain low-end power and still get a kick in the mid to high end.
3. i wanna make sure i dont run into any trouble passing emissions (dallas county is getting sticky). if i get one of the Carsound cats that Bernd sells i wont have to run an O2 simm will i? just concerned about making sure i get one that wont trip any MIL's and has hook-ups for existing whatever.
4. anyone got any dyno results from installing a high-flow? i've seen numbers range from 5-15 rwhp. just wondering if i should expect a decent
boost from this.
thanks in advance for any help!
-adam
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CThomp
Dodge Dakota
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6/10/2002
14:49:32
| RE: High-flow cat ?'s
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Duner (turbo4.7L) had good luck with a high-flow cat. Get your TB before you open up your exhaust anymore. If you end up losing bottom end you should look into cams. They're a sure bet for good torque increases.
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crm
Dodge Dakota
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6/10/2002
15:05:16
| RE: High-flow cat ?'s
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CThomp: i think thats the way i am headed. i dont do any towing or hauling with the truck, so my interest is more play than anything else. and the odd chance that i do get to play, it's gonna start out from a dead stop :) so losing low-end is something i wanna avoid if at all possible.
now i just need to decide on all the TB stuff :)
thanks for the help... (on both ?'s) :)
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CThomp
Dodge Dakota
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6/10/2002
15:30:39
| RE: High-flow cat ?'s
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For the TB go with the Fastman. You retain the "stock look" and flow is flow. Meaning a 71mm Fastman will probably flow more than a 70mm F&B but not as much as a 72mm F&B. The Fastman also costs $200 less than the F&B.
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ChuckF
R/T
6/11/2002
07:54:34
| RE: High-flow cat ?'s
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I am going to the Dyno on Saturday and will post graphs. I have the following mods installed:'
Mopar Headers
Mopar PCM
2-1/2" Borla True Dual Exhaust with Random Tech Full Flow Cats
K & N Cold Air Kit
52MM Flometrics TB
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trevor
Dodge Dakota
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6/11/2002
11:16:45
| RE: High-flow cat ?'s
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man i know what you're saying about losing low-end torque, but not to fear, a few mods here and there will pump it right back up. i did the same thing. dont worry, get the high flow cat, b/c its going to be one of the many accesories you will be adding whether or not you think yuou will b/c performance is addictive and you wont be able to stop!
get the catco cat from summit or jegs(cheap&good)
92 dak, cc, 318, k&N, catco cat,flowmaster,B&M shift kit, asp pullys, modine radiator, mpsbec chip, flowtech headers, accel wires, bosch +4, 2" 3" lowering, roll pan, throttle body spacer.
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crm
Dodge Dakota
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6/11/2002
18:34:03
| RE: High-flow cat ?'s
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yeah, i know i'll definitely be getting one, just wanna make sure i do it in the right order (or close to it).
i looked at summit's site and cant figure out which one i'll need. i know it's 2 1/2" in/out, but on a 2001 4.7L do i need one with an air hose or connectors for an O2 sensor? also, what length?
-adam
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tman
Dodge Dakota
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6/13/2002
00:37:38
| RE: High-flow cat ?'s
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check what the diameter is of the pipe that youre going to place the cat, or find out from the dealer and get what you want.
92 dak
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crm
Dodge Dakota
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6/13/2002
01:06:20
| RE: High-flow cat ?'s
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tman: i know the diameter, just wondering what "options" it needs to have to hook up to any existing sensors or air-tube...
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Wedo
Dodge Dakota
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6/24/2002
19:23:52
| RE: High-flow cat ?'s
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Any updates on the cat back system?
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tman
Dodge Dakota
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6/25/2002
01:11:44
| RE: High-flow cat ?'s
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im not to sure about the 4.7, but on my 5.2, the o2 sensor is on the y-pipe and there were no fittings to go on the cat. the little air tube that was on the cat, i just bent and sealed it off so nothing would escape.
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BlkDak
Dodge Dakota
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6/25/2002
15:45:50
|  RE: High-flow cat ?'s
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Ok, now im a little freaked out. I was heading towards getting an exhaust for my 3.9
I have no other mods, but planning on getting an intake. But if i get an exhaust.. am i going to lose back presure or what ?!
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crm
Dodge Dakota
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6/25/2002
16:03:32
| RE: High-flow cat ?'s
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you might lose some, mainly depends on what you do... i think that as long as you do some intake mods on the top end and dont get to radical on the exhaust you should be okay.
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tman
Dodge Dakota
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6/25/2002
19:14:08
| RE: High-flow cat ?'s
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BLKDAK... stay with a smaller diameter pipe, for instance, the 3.9 has a 1 7/8 pipe.... upgrade w/mandrel bent tubing 1/4 inch bigger for more flow. any more and you'll lose torque. and must i mention... get a nice sounding muffler. check around on the internet and listen to some 3.9's with flow's, dynomax, edelbrock, etc. thats what i did on my 5.2, and all my friends are jealous as hell!!! It'll be the most fun research and definatly worth the time, b/c it will save you money in the long run! trust me:-(
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BlkDak
Dodge Dakota
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6/25/2002
20:11:51
|  RE: High-flow cat ?'s
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I was told to go with something along the lines of 2.5" In/out ? ? Does that sound right ?
Or 3" ?
If i go with 2.5 will i loose any ? ?
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tman
Dodge Dakota
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6/26/2002
23:24:40
| RE: High-flow cat ?'s
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what is your pipe diameter right now? what ever it is, go 1/4 in. larger pipe.. but if you're planning on doing more mods to your dak then go with 1/2 in. larger pipe
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Jesse T,
Dodge Dakota
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7/22/2002
15:18:47
| RE: High-flow cat ?'s
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So will a free flowing cat help the 3.9 motor, I have one cat right now and I have flowmaster dueals and intakea and alot of other mods, I just want to know if it is worth the money.
Jesse T.
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Canucker
Dodge Dakota
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7/22/2002
15:32:23
| RE: High-flow cat ?'s
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Hey CRM
Have you done any dyno runs since you started all your mods? I'm interested in what your new dyno curve looks like (I have most of the same mods planned - taking the truck to the exhaust shop today).
thx.
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crm
Dodge Dakota
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7/23/2002
12:15:38
| RE: High-flow cat ?'s
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canucker: i have done 2 dyno runs so far. however, the first run is rather skewed and prolly should just be thrown out. right now i am at 208 rwhp and 289 rwtq, ande i trust that those number are accurate. i've not done any other mods since the Fastman TB as the money i would have had for mods was tied into stock options that are now virtually worthless :(
hopefully i'll be able to get the cams and intake done in the next 2 months, just wish i had the confidence to do them myself. in the meantime, a gutted cat or a flanged pipe might be in the works.
if you do a search for "quad cab sleeper project" you'll find links to the scanned dyno sheets as well as the depressing conversation that followed :)
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crm
Dodge Dakota
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7/23/2002
12:24:39
| RE: High-flow cat ?'s
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well, the search didnt seem to work, so here is the link:
https://www.dodgedakota.net/boards/per/4933.html
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Canucker
Dodge Dakota
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7/23/2002
12:25:45
| RE: High-flow cat ?'s
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yeah I was keeping up with most of that conversation and saw those dyno sheets.
I was just curious about the rest of the mods, but I guess you're not quite done yet.
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crm
Dodge Dakota
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7/23/2002
12:39:39
| RE: High-flow cat ?'s
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nope, not anywhere near done :) money has been kinda scarce for mods since the stock market started sucking.
i'd really like to be able to provide everyone with a step by step documented improvement in dyno pulls, but considering that adds another 45-65 bucks for each mod, it gets steep really quickly. i'll plan on another dyno after the cams and cat upgrade. by then i'll also have new plugs and the 180 t-stat installed.
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Canucker
Dodge Dakota
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7/23/2002
17:42:17
| RE: High-flow cat ?'s
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yeah I hear you...cheapest I found here was $70 CDN.
I have one planned after I get my cat-back exhaust on there and a TB (right now all I have is my home brew K&N). Then I will likely do the cams and port and polish my heads and do another pull ... I'm not sure where in there I'm going to put some headers and a high flow cat on .. maybe right after my cat back...
even still, that's 3 pulls ... $210!!! that's half a throttle body ... or 1/20th of a supercharger ;)
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Riv
Dodge Dakota
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12/12/2002
00:16:00
| RE: High-flow cat ?'s
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I live in ontario canada, and we recently got emission laws. Would a larger high flow cat. screw up my emmision readings in my 2000 R/t. I'm thinking headers too possibly, later as the kids get older a blower, or twin turbo set-up. Any info on any of these would be helpful.
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