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Post by FMOS Racing on Jun 4, 2022 14:53:14 GMT -5
Couple of quarter mile passes last fall. Everything (engine, transmission, boost, launch control, aux fuel supply, fans, etc) controlled via PimpXShift.
10 psi, the way I always drive the truck, and how I drove it from Raleigh to Cecil (through DC and Baltimore) for the Spookfest event. -
14 psi -
16 psi -
A section of a paced drive around Charlotte Motor Speedway
Last pass of the day (not shown) matched my previous best mph, which was run with a mass air conversion, manual boost control, 19 psi, less weight and a much better torque converter than I currently have in it. I have another real torque converter (Circle D) ready to go in, so hopefully I can build more boost on the brakes; I'd like to see a half second and 3-4 mph improvement at the same boost.
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Post by Stinger on Jun 6, 2022 14:49:53 GMT -5
That's straight up getting it done! Nice to see the steady progression of ET dropping/MPH going up as boost went up. Should really run once it can launch harder with the better converter.
Would like to see time slip and a datalog of one of the high boost passes.
Is this the stock trans or has it been "built"? I assume the latter...
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Post by FMOS Racing on Jun 7, 2022 6:36:00 GMT -5
It's built, billet planetaries and other 4R100 updates to the E4OD, roller bearings, good clutches, etc. It's been together for about 20 years, lots of quarter mile passes and towing in its history. Currently just a big 2200 rpm converter in it because I towed with it; I have a smaller, 3000 rpm piece waiting to go in. At one time I had a Circle D five clutch converter in it, but at that point I didn't have any control of torque converter lock-up (OEM trans control), and that thing hit so hard when it locked that it was pretty annoying to drive.
The only thing I did between the passes above was change the boost level (and disable overboost protection when I hit that on my first 16 psi pass). A few mouse clicks and key strokes and then wandered off to talk to other people while it cooled off. Pretty sweet!
I'll post a time slip and log this evening.
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Post by Stinger on Jun 7, 2022 11:44:35 GMT -5
Thanks for the info!
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Post by FMOS Racing on Jun 8, 2022 6:06:48 GMT -5
Probably also worth mentioning that the truck gets 15-17 mpg at upper-70s mph on the interstate. Log attached. Time slip, it looks like the 1/8th is 7.38.  |
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Post by Stinger on Jun 9, 2022 10:59:54 GMT -5
That's not too bad of a 60ft considering the tight converter.
That's a great MPG, what do they get in stock form under the same conditions?
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Post by FMOS Racing on Jun 10, 2022 5:53:38 GMT -5
I actually have to amend that. After Spookfest, I posted this on the NLOC board "14.8 mpg for the trip, including all the idling and track time. Not too shabby!"
So, 15 mpg was round trip, through DC and Baltimore traffic, a dozen or so quartermile passes, etc.
That 60' is totally because of launch control. My first few passes were without it and the 60' times were 2.1s. With launch control, I was able to build ~1.5 psi on the brake. She oughta leave with some enthusiasm at 5 or 6 psi.
It's too bad it's still a 2-bolt block.
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Post by Stinger on Jun 10, 2022 10:34:23 GMT -5
That's even better for MPG!
Yeah, launch control is amazing, especially if you can reach an RPM high enough to build real boost.
2-bolt block should be OK. Turbos are pretty easy on the block relative to the alternatives (superchargers or nitrous) and you keep the RPM reasonable. We've got a customer making north of 700hp on a stock 5.0 block that supposedly splits around 500hp and he's been doing it for years.
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Post by FMOS Racing on Jun 15, 2022 6:35:14 GMT -5
A few guys have pushed stock bottom Windsors way up there in power, which is really impressive given the hypereutectic pistons, but I'm at the point of erring on the side of caution. I have forged stuff for the moving pieces, but the last time I had the motor apart, I could see some fretting on the mains, even with the girdle. I'd rather not push the crank into the oil pan.
Who knows, I may get saucy one day and throw 22 psi at it. They tell me that's where things start to get fun...
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Post by Stinger on Jun 15, 2022 9:47:11 GMT -5
Yeah, it's certainly ideal to avoid catastrophic destruction, especially because a massive oil-down event like that can risk putting the truck in the wall as well.
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slow94
Boosting 25 psi
Posts: 205
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Post by slow94 on Jun 20, 2022 20:20:05 GMT -5
A few guys have pushed stock bottom Windsors way up there in power, which is really impressive given the hypereutectic pistons, but I'm at the point of erring on the side of caution. I have forged stuff for the moving pieces, but the last time I had the motor apart, I could see some fretting on the mains, even with the girdle. I'd rather not push the crank into the oil pan. Who knows, I may get saucy one day and throw 22 psi at it. They tell me that's where things start to get fun... Meh... Gets fun at 23 psi lol. Btw your truck has the 1/8 mile mph to go 6's. Definitely a ten second truck once you get 60' sorted. Hope to get my truck back to track soon (1/8 mile) to better my 6.53 pass. |
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