Agree, just vacuum of -22 at idle. When that reaches 0, you are WOT and at atmospheric pressure. when it goes positive: +6 psi, that is your boost.
URD Supercharger 5th gen
- Thread starter Turfboy
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Agree, just vacuum of -22 at idle. When that reaches 0, you are WOT and at atmospheric pressure. when it goes positive: +6 psi, that is your boost.
Turfboy
Member
At Idle at a stopped at a light it normally reads -8 or -9. This read +22 or +23 going up the hill. Next time I will take a screen shot of the event so I can post.
-8 or -9 psi makes more sense for idle vacuum.
+22 does not for full load! Around 20+ psi is what most stock boosted engines are running. You are running the stock URD kit right? Website says it generates ~5.5-6 psi of boost. On an otherwise stock 1GRFE you would be making like 500+ hp haha!
Looking forward to videos!
Turfboy
Member
So I went Xmas tree hunting in the Forrest today. Took some screenshots of hill climbs. I do not think the Closed Open loop is registering correctly.
I thought someone indicated you could roughly calculate HP from the Mass Air Flow. I wish there was a Fuel Air or Lambda that worked for this app. Temp was 36%, Elevation 3750 ft. :nerd:
Light acceleration up the hill, Moderately heavy acceleration, Heavy acceleration
I thought someone indicated you could roughly calculate HP from the Mass Air Flow. I wish there was a Fuel Air or Lambda that worked for this app. Temp was 36%, Elevation 3750 ft. :nerd:
Light acceleration up the hill, Moderately heavy acceleration, Heavy acceleration
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Turfboy
Member
In trolling through the T4R web site I found a reference to the URD developer's web page and what he went through in developing his superchargers. Mostly the trials around the TRD unit. I can see why he developed his kit the way he did.
Happy reading:
GadgetOnline.
Happy reading:
GadgetOnline.
honda250xtitan
New member
I cannot wait till we supercharge ours.
the transmission article is neat. a lot of guys used to go to level 10 in my Titan days.
the transmission article is neat. a lot of guys used to go to level 10 in my Titan days.
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Turfboy
Member
Went in for emissions test today.
Visual inspection of
Air Injection: Pass
Catalyst: Pass
Gas Cap: Pass
On Board Diagnostic system:
Overall Result: Pass :bounce:
So with this post a small driving update: Winter road conditions were slushy and now have dried out. My MPG has fallen off 20 and is now running 18. I now feel comfortable merging into smaller openings as the power between 1800 rpm and 2500 rpm is vastly improved. Cold starts are where I loose the bulk of my MPG. Once things are warmed up my average starts to climb however most trips are short. :caked: The radium surge tank is noisy and because of the trigger for the relay it runs well after the car is shut down (but it works). Once the weather warms up I will look for another relay trigger or try out a solid state relay hooked up to the regular pump signal.
Visual inspection of
Air Injection: Pass
Catalyst: Pass
Gas Cap: Pass
On Board Diagnostic system:
Overall Result: Pass :bounce:
So with this post a small driving update: Winter road conditions were slushy and now have dried out. My MPG has fallen off 20 and is now running 18. I now feel comfortable merging into smaller openings as the power between 1800 rpm and 2500 rpm is vastly improved. Cold starts are where I loose the bulk of my MPG. Once things are warmed up my average starts to climb however most trips are short. :caked: The radium surge tank is noisy and because of the trigger for the relay it runs well after the car is shut down (but it works). Once the weather warms up I will look for another relay trigger or try out a solid state relay hooked up to the regular pump signal.
Thanks for sharing more info. The "Boost" sensor must be in Manifold Absolute Pressure. So, whatever it reads, subtract the atmospheric pressure (~14.7 psi or a little less since you are in some elevation).
So, you are actually still at ~-4 psi vacuum in first shot, and +7 psi boost in the third. This aligns. I agree it should show open loop at full throttle, weird it shows closed.
Great news regarding emissions!
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Turfboy
Member
6k update.
City driving MPG 18. Feels a little less than what I was getting prior to the mod. Some of that is due to driving in the snow/slush which killed me.
Did a quick trip to the coast over two Mtn Passes. Blues and Snoqualmie. Prior MPG prior to the URD Supercharger it was 20.11 to 21.22 MPG. Post Mod was 20.51 MPG. The MPG post mod was more consistent.
The rig seldom down shifted unless on a steep grade. Below are some screen shots from Ultragauge blue during the trip. All photos are Cruse control set to 70 MPH. The first is level ground. The second is on Snowqalmie prior to kick down and the third is post kick down on same hill. Note the RPM to MAF (Mass air Flow). HP is 10 x MAF or so I am told.
City driving MPG 18. Feels a little less than what I was getting prior to the mod. Some of that is due to driving in the snow/slush which killed me.
Did a quick trip to the coast over two Mtn Passes. Blues and Snoqualmie. Prior MPG prior to the URD Supercharger it was 20.11 to 21.22 MPG. Post Mod was 20.51 MPG. The MPG post mod was more consistent.
The rig seldom down shifted unless on a steep grade. Below are some screen shots from Ultragauge blue during the trip. All photos are Cruse control set to 70 MPH. The first is level ground. The second is on Snowqalmie prior to kick down and the third is post kick down on same hill. Note the RPM to MAF (Mass air Flow). HP is 10 x MAF or so I am told.
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Brandonium
Member
I am confused. I am not seeing where URD sells this supercharger anymore. When you go to their website they sell Magnuson.
Turfboy
Member
I had to get on a waiting list. They are currently out of stock. I got a email letting me know when they were going to get some (heads up type thing). The superchargers were sold out in a day or two.
URD Supercharger Kits - Underdog Racing Development
The Magnuson units do tend to be more available. I think the issue may be the adapter between the Whipple W140AX and the 1GR-FE Heads. When I got mine it appeared to be machined out of a solid block of aluminum as I could see some tooling marks. The remaining parts all appeared to be off the shelf type stuff that is available on the open market.
Brandonium
Member
I messaged them and yup you are correct. I am curious since I am not seeing a lot of URD posts nor anything on the web regarding them on the 4Runner.. do you have any concerns regarding longevity and reliability vs the Magnuson since these do pump out significantly more HP and Torque? I remember seeing a set of videos on youtube regarding the install of a URD setup on a 5Gen but they have since vanished. All I can find anywhere is Magnuson stuff.
Turfboy
Member
The rig drives the same unless I need the power (less than 5% of the time and just because I have it). When I start towing big stuff I plan on changing fluids more but I would do that anyway. So the short answer is, I have no concerns regarding longevity nor reliability in any respect vs stock or Magnuson.
In severe stress testing I do believe that I got the supercharger belt to slip on hard acceleration up a very long steep hill. That same hill with no supercharger, stock would just gear down and rev really high. I probably got the same HP from the engine... just different ways to get there.
Steve40th396
Member
Have you monitored oil and trans temp before and after install?
Turfboy
Member
honda250xtitan
New member
Looks like they are available to order now.arty:
shipping on or before July 1 too.
also, did you see his new Spec-U exhaust???????? wish i saw that before i did the URD y pipe and magnaflow muffler swap.
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Turfboy
Member
I like it but I think it runs through the area where I have my surge tank(in front of the gas tank). :frusty:
rayofsi
New member
I have the regular URD exhaust installed, have a spec u sitting in my garage... along with a borla... and a magnaflow...
i don't know why i bought them all.
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