What's new
By:
Filters

MNR 4600 class 2021 U4 Bronco build

JR4X said:
And before I forget to mention it, Paul Wolf DNF’d after leading 3/4 of the race because he blow a steering box
Click to expand...

After Waylon broke his front drive and couldn't make it up Rockface sombody should have told Paul to back it down a few notches. At that point he had a huge lead over 3rd place and could have easily won the race but his balls out pace did him in.
 
JR4X said:
And before I forget to mention it, Paul Wolf DNF’d after leading 3/4 of the race because he blow a steering box
Click to expand...
When he came by us at Rock Face on lap 4 he had a 20+ minute lead over 2nd place.

SLOWPOKE693 said:
Crossbar seems to be one of those places where you are winning the race right up until you're not. The 4400 cars I was thinking had a shot at the win; Wolf, Campbell, and the Gomez brothers all ended up with issues that basically gave the win to a mid pack guy that ran the course slow and steady.

That happened in pretty much every class all weekend including JR4X's 4600 race. Dude that qualified pole in 4600 beat the ever living shit out of his Cherokee around the short course and made a great lap but I guess he tried keeping that pace on the actual race course once the green dropped and he broke the truck within a few miles of the starting line and killed his chances of winning the race. Meanwhile here is JR4X keeping a quick steady pace but not going so fast that he's going to break the truck to the point of not being able to finish and that steady pace put him in the lead early and got him the win. :smokin:

This is why I'm intrested in racing in the 4900 Stock UTV class there next year. Fast gets you a good qualifying spot but maintaining a steady pace that doesn't break the car is what gets you a finish.
Click to expand...

I seem to remember someone saying multiple times, "That guy is going way slower through that section than I would be going" :flipoff2::flipoff2::flipoff2:
 
665.0coupe said:
When he came by us at Rock Face on lap 4 he had a 20+ minute lead over 2nd place.



I seem to remember someone saying multiple times, "That guy is going way slower through that section than I would be going" :flipoff2::flipoff2::flipoff2:
Click to expand...
I still think that. He would have been better off flying down the entrance an exit of Rockface to make up time as opposed to doing it out in the rocks where he obviously hit something at speed to break his steering box.
 
It won’t be in my race recap so I’ll talk about it here. I don’t know if it was just the lower elevation difference but on race day the little ecoboost flipped a switch and gave me more power. I don’t know what to attribute that to but the whole race I could run everything in a gear higher than I’m used to and it still had the balls to accelerate. We ran the whole thing in high range and never struggled for power. I didn’t have that for qualifying either. The drone footage didn’t air but on the short course we hit the big jump and flew to far into a bad landing that rebounded the front end off the ground. Now I get why they call Vaughn’s Bronco “Bucky”. First I thought that’s weird, I hit that same jump yesterday at full throttle and it didn’t do that. Then it just kept surprising me the whole rest of the race. And my dash is a code reader, I check for codes in the ECM every time I’m in staging now, it didn’t say it had any issues for qualifying and I didn’t clear any codes. It just woke up and chose violence that day. Here’s a little photo sequence of popping the wheelie that kinda surprised us both

01HF3937.jpg
DLYN2572.jpg
DLYN2573.jpg
 
I'm curious about the power.

My old two strokes would gain power when they loosened up. Wasn't a good sign for them. :laughing:

My boat has been the only thing I could actually have some sort of measurement on power. It's a jet and it absorbs the same amount of power to spin any given rpm and I run WOT more than I would prefer. It is a 351 Ford that is carbed and rated for 295HP. I have no other info on specs. I'm assuming fuel injection would help with the loss.

At 500' in elevation it will turn 4400-4500rpm, at 8000' it will turn 3800-3900rpm. I lose about 100 rpm when the temps go from 50 degrees to 100 degrees.

Every 100 rpm is very obvious.

Congrats on the win!
 
This engine is exactly a year old and might have 1200 whole miles on it. A year ago I was just breaking this thing in at Havasu finals.
 
They are always the fastest right before they blow up. :flipoff2:

I'd attribute the gained power to air density altitude #'s that changed from one day to the next. Forced induction engines are sensitive to those kinds of things and depending on how crappy or good the DA is that day decides how much HP it will gain or loose if you don't adjust the boost pressure up or down to account for it.

Next time it feels "slow" bump up the boost 3 or 4 pounds and i bet it helps put the kick back in it.
 
Haven’t even started on KOH prep yet. This is what I’ve been up to instead. Chasing the Ranger Raptor at the Baja 1000. This has been one of the coolest experiences ever. Loren Healy is the driver of record but I’m pit crew for Bailey Campbell
IMG_6914.jpeg
IMG_6915.jpeg
IMG_6916.jpeg
IMG_6917.jpeg


Just got done with tech and contingency
 
You must log in or register to reply here.
Top Back Refresh