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DYNO TEST - MAGNAFLOW CATS VS OEM's - WOW!!!

11K views 28 replies 12 participants last post by  Tx14ImpalaLT2 
#1 ·
Yes sir! I finally tested the Magnaflow cats (PN: 52184, 52185 and 52107). for more info, click here: http://www.impalaforums.com/8th-gen...flow-direct-fit-catalytic-specifications.html Anyway, WOW!!! I did feel that new founded power on street and track, but learned to keep calm and wait for the results. And boy it makes power, everywhere. Max Gains are +20WHP and +23WTQ with the Peak gains at + 20WHP (from 260 to 280) and with + 22WTQ (from 239 to 261). Please click the attached file to view the test report.
 

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#6 ·
Wow. With your high flow downpipe cats, highflow 3rd cat, and the cat back, you got some serious gains for decent $$ 30whp/torque approx. This is definitely on my to-do list after TB/intake spacer
 
#8 ·
Is this still considering you are running the trifecta tune? And if you are, are you getting retunes for all these mods cause I would think there might be a little more to squeeze out if you had a retune. Any chance that an overkill tune would probably be even better with all these mods? Sorry for all these questions but those numbers are so impressive that I would like to think that a retune would get you even closer to the 300 whp mark!
 
#9 ·
20Imp...


Yes I'm still running the Trifecta tune, and yes I just did a re-tune (after the dyno), but, all the parameters were good (timing, air/fuel, etc. etc.), so no changes were done regarding that, but, got my max speed increase (260KM/H vs. 180KM/H). and the reason I'm was also planning to go and to do the 1/2 mile race this week-end, but I back off because of heavy rain (track in Smith Falls in Ontario, Canada).


A my going to use the Overkill tune? that's a very good question? I'm not sure yet, very happy with the T-WOT tune, but, I also acquired Overkill's 3.5" intake upgrade a while ago and I'm tempted to give it a shot, but not now.


And yes, if I look at my best overall pull on the dyno (with the GMS coils), I'm only at 16whp away from the 300 mark.
 
#10 ·
I think you should get the overkill 3.5" MAF and intake/ tune, I really feel like that will help you out. I believe Will was seeing some good gains with it on other cars he tested, maybe he can chime in on the numbers. With that and the pulleys you very well may hit the 300 whp mark...
 
#11 ·
I'm curious - with all of the power you guys are adding to the engine, have you thought the transmission? Apparently, the 6T70 is only rated to handle a maximum of 315hp (that's engine horespower - not wheel horsepower!) - so I'm sure that you are already way over it's "limits". I would be worried about transmission reliability at this point - especially if you are constantly doing WOT's (like at the track)..

Just something to think about... The trans just isn't designed to handle much more power than the car comes with in stock form (I think it's 300hp or 302hp in stock form).

http://www.theautochannel.com/news/2005/08/25/141299.html

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#12 · (Edited)
That might be true with the 1st gen 6T70 that was in the saturns and other vehicles when it debut in 07 but with these new 6T70's i wouldnt worry. The main thing i look at is how much torque it can handle which i think is 324-350 lb-ft with 6T70. In which probably wont be a problem if anyone dont turbo charge it.

http://gmauthority.com/blog/gm/gm-transmissions/m7w/
 
#13 ·
I wasn't aware that there were multiple "gens" of the 6T70. I know that they replaced the defective 3-5-R waveplate at one point, but other than that, I was under the impression that current 6T70's are the same as the original 6T70's. According to that link, the torque limit is 280 ft. lb. (gearbox toruqe)..

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#14 ·
I wasn't aware that there were multiple "gens" of the 6T70. I know that they replaced the defective 3-5-R waveplate at one point, but other than that, I was under the impression that current 6T70's are the same as the original 6T70's. According to that link, the torque limit is 280 ft. lb (gearbox toruqe)..

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engine torgue is ... That engine Maximum (gearbox) torque (1st gear): 331 lb-ft (450 Nm), Maximum (gearbox) torque (2nd-6th gears): 379 lb-ft (515 Nm). those some high numbers.
 
#15 ·
Ooops - had that backwards - Max Engine Torque for the 6T70 is listed as 280 ft. lb. and max gearbox torque is listed as 380 ft. lbs. Not sure I understand what the difference between the two are though... THey are both specs for the transmission and not the engine so the 280 ft lbs. still seems to be a transmission limitation that may be being "exceeded" when engine power is increased so much....

Any idea what the difference is between the max engine torque and the max gearbox torque (in terms of transmission specs)? I'm guessing that it's the max torque limit where the engine and trans are "connected" (maybe torque converter related?). And the gearbox torque is the max the trans internals can handle....

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#26 ·
Oh WOW, Turbo 400, I hope you meant the 4T40 or 4T45.


The 400's are for (or the 700's and 4L's) RWD applications.


But honestly, I would not trade my 6 speed for a 4 speed. Plus, the 6T70 and 6T75 are for medium duty application, on the 8th Gen Impala, with about 3,800 pounds (with driver), it's serves very well
 
#18 ·
That's the problem - as far as I know, you really don't have any options when it comes to the transmission replacement. Although, I'm guessing that you might be able to have a trans shop rebuild the 6T70 with stronger components, which may help.

Or - maybe I'm just over-thinking this and the trans will hold up just fine with the added engine power... Initially, the trans "315 max hp" limit caught my eye, which is why I brought this up - people are building up the engine to put out way more than 315hp.... It's just a matter of time before the trans becomes an issue with added engine power.

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#20 ·
Yeah, the 6T80 lists the max engine torque as 369 ft. lbs, which is significantly higher than the 280 ft lb. max engine toque of the 6T70.

It's also used in the Cadillac XTS VSport, which puts on 410hp, so obviously the 6T80 trans horsepower limit is much higher than the 6T70 (which is listed as 315hp)...

I wonder if you can put a 6T80 in place of the 6T70? Maybe that is an upgrade option...

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#23 · (Edited)
i find that disappointing. I wonder how conservative those ratings are. I do know those are rating that gm themselves gave the transmission. Now whether they are actually different between the different models im not sure.
 
#29 ·
Sorry to hijack an old thread, but are these CATS compatible with the latest generation of Impalas? (2014 - 2019)? And do you have to get all 3 or are they just choices?

Thanks!
 
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