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Performance, Tuning, and (LEGAL) RacingPost discussions about increasing performance, capabilities, and racing.
****WARNING**** Street racing or illegal activities will be removed and potential bans will
be handed out.
I try not to overheat mine so I don't do any back to back pulls. My intention is to eventually get a y pipe...undecided on longtubes...I just want to keep the street manners of the truck. It wasn't even supposed to be going this fast. Oops.
I’ve been wondering how robust the stock truck cats are. The stock mustang gt cats are very delicate. The Roush 2650 tune sends the truck into cat protect (pig rich) within 1 second of going wot.
Don't seem to be very robust, I had to replace mine with G-Sports right in the middle of tuning on 91. Ken @oztuning seen some restriction causing boost spike and knock on the way to 7500 rpm. Cats fixed it.
Don't seem to be very robust, I had to replace mine with G-Sports right in the middle of tuning on 91. Ken @oztuning seen some restriction causing boost spike and knock on the way to 7500 rpm. Cats fixed it.
I am pretty careful not to hot lap or anything, never gone more than a 1/4 mile WOT. But I'm thinking being in the 900's at the crank, is asking a lot of them.
And yes, the Whipple tune goes into enrichment very aggressively and fast as well, winter on the stock cats, and perhaps some Gesi HO's in the spring.
Finally got the dyno sheet. It's poor quality (they took a photo instead of just sending me the file) but it has the RPM on the x-axis. With that torque curve, if this **** could rev to 7900rpm, it would have made close to 900whp. Sheesh.
Last edited by diambo4life; 11-06-2023 at 03:15 PM.
While my truck has run 10s in Mexico, I wanted something official and today was the day. Back to back. DA wasn't as nice (2200'ish) but again...NOTHING REMOVED! This is a stock Lariat still at ~5600lbs with me in it. Couldn't be any happier. ALL SEASON TIRES...lol.
Last edited by diambo4life; 11-11-2023 at 12:07 AM.
@isthatahemi How many miles did you get on your stock cats, before and after the Whipple? I am trying to decide whether going catless this winter should be a priority. .
Last edited by diambo4life; 11-12-2023 at 04:20 AM.
11-03-2023, 04:04 PM
Sheesh. 
