2021 Heritage Supercharger Experience

[gluaisrothai]

The difference is Toyota is aware we don’t need the ability to drive our vehicles at 7000ft below sea level.

Wrong. Toyota actually included that coverage in the stock ECU…which is what the Harrop evaluation demonstrated. Why? Density altitude. It’s a performance factor pilots think about a lot, usually on the other end of the scale (high temp, high altitude reducing performance).

It’s not uncommon to see density altitudes of 3000 feet below sea level in colder low altitude regions, and I believe that 5000 feet below sea level has been seen in Alaska.

That is why the margin is there. Harrop exploits it.

The corollary is of course that if you live at sea level and try a full throttle drag run on a -40 degree day when the atmospheric pressure is extremely high…you might run out of margin.

 

[bloc]

Wrong. Toyota actually included that coverage in the stock ECU…which is what the Harrop evaluation demonstrated. Why? Density altitude. It’s a performance factor pilots think about a lot, usually on the other end of the scale (high temp, high altitude reducing performance).

It’s not uncommon to see density altitudes of 3000 feet below sea level in colder low altitude regions, and I believe that 5000 feet below sea level has been seen in Alaska.

That is why the margin is there. Harrop exploits it.

The corollary is of course that if you live at sea level and try a full throttle drag run on a -40 degree day…you might run out of margin.

Because you were there when they designed it? Or you investigated and they hired a bunch of pilots?

Eliminating the margin sure sounds like a way to **** up an engine in the real world. As does riding the knock sensors.

Since it was such a great point it bears repeating.. If they could develop a tune for this platform, they would have. They didn’t. This is a high horsepower band-aid.

 

[PJS]

OP: I have had the Harrop on my 2021 since new - currently at about 14k miles with no issue (admittedly it’s still early though) and the added power is nice and feels oem… based on my experience so far I would do it again.

 

[AnyMal]

OP: I have had the Harrop on my 2021 since new - currently at about 14k miles with no issue (admittedly it’s still early though) and the added power is nice and feels oem… based on my experience so far I would do it again.

Please keep us posted, i want to see one of these reach 300k and id be satisfied. I dont think time permits though…

Highest mileage on MUD for a SC?

 

[Jason Andrews]

In general I hate to weigh in here because no one is going to change their mind.

The only reason that I'm posting is because of ignition timing. Harrop tested with the equivalent of 93 Octane. If you can get 93 regularly, great. I can't. Harrop states that with 93 and boost knock is equivalent to 87 NA. Meaning that knock is present and timing is being pulled. I've done tunning on a heavily modified 3FE and am pretty comfortable with Harrop's approach to fueling. However, I'm not willing to ride the knock sensors more than Toyota intended.

You sure you have all that right? It is confusing. In AUS their 93RON is equivalent to our 91AKI(anti knock index). 91ACN(served in Cali, Arizona, and Nevada, maybe more) has the worst qualities and is much more prone to knock. This is according to an experienced Toyota/Lexus tuner.

Please keep us posted, i want to see one of these reach 300k and id be satisfied. I dont think time permits though…

Highest mileage on MUD for a SC?

On tundra forums there are several first gen Tundras with the 4.7 into 6-700+k with a SC saw mention of 310k with the SC being installed at 60 so 250,000 miles with a SC.

The only reason they're not including a tune with this kit is because they can't make one. You know damn well that if they could, they would be. Them claiming that it doesn't need one is just bogus.

Exactly.

Third.

They claim that adding a tune with stage 1 didn't do anything to the power levels IIRC. I'd say thats total crap and a good tune should be able to add ~50hp by tuning a stage 1, but would likely need supporting mods of pump and injectors.

It's true, they aren't "aware" they can tune for most of the years, but for sure not a 2021 yet. My concern on why having a "canned" tune that comes with the stage 1 setup isn't a good idea is the various other mods that every different vehicle has. Given the vastness of mods that could effect how an ecu/tcu tune runs on a particular truck it seems to me like custom is the only way to go. Differences in tire size and gearing would make it tough for a one size fits all tune although I'm definitely not an expert at the subject.

 

[Moby]

You sure you have all that right? It is confusing. In AUS their 93RON is equivalent to our 91AKI(anti knock index). 91ACN(served in Cali, Arizona, and Nevada, maybe more) has the worst qualities and is much more prone to knock. This is according to an experienced Toyota/Lexus tuner.

No, I'm not sure that I have this right. I found a formula that gave me those numbers. But I also found conflicting info. If it's wrong and their test fuel is equivalent to 91 here than I would certainly have less concerns on the timing side of things.

 

[ROM]

I did it on my 2008, Did the install myself and also did the tuning using HP tuner in stage 2 form. Be prepared to have the car tuned or tune it yourself. You really don't need to change any on the timing side if the application for on road both for stage 1 and stage 2. MAF will need some scaling to make it happy (no Check Engine) and the use the data sheet for your injector to enter the new calibration. You need to pay attention on the injector timing entering the minimum pulse. I notice from my DW650 injector you get some imbalance of pulse synchronization, from my experience the minimum pulse influence this function. The injector should all be selected and balance for the set. But again the drive for each injectors are different, so the drive and load function could be more sensitive that expected.

Justification, if you like to flex every now and then because you drive an assuming SVU, heck this truck will do! The Harrop is adding a good amount of air volume at low end with minimal boost, almost the charger was design for the 5.7 engine.

 

[Docwyte]

You sure you have all that right? It is confusing. In AUS their 93RON is equivalent to our 91AKI(anti knock index). 91ACN(served in Cali, Arizona, and Nevada, maybe more) has the worst qualities and is much more prone to knock. This is according to an experienced Toyota/Lexus tuner.


On tundra forums there are several first gen Tundras with the 4.7 into 6-700+k with a SC saw mention of 310k with the SC being installed at 60 so 250,000 miles with a SC.





They claim that adding a tune with stage 1 didn't do anything to the power levels IIRC. I'd say thats total crap and a good tune should be able to add ~50hp by tuning a stage 1, but would likely need supporting mods of pump and injectors.

It's true, they aren't "aware" they can tune for most of the years, but for sure not a 2021 yet. My concern on why having a "canned" tune that comes with the stage 1 setup isn't a good idea is the various other mods that every different vehicle has. Given the vastness of mods that could effect how an ecu/tcu tune runs on a particular truck it seems to me like custom is the only way to go. Differences in tire size and gearing would make it tough for a one size fits all tune although I'm definitely not an expert at the subject.

I don't see how different wheels/gears impacts the engine tune. The engine wants what it wants and doesn't know what gears are in the diffs or what size wheels are turning. A box tune should be fine and is far superior to no tune at all, or a bad "custom" tune. If it's a 50 state legal tune, like what Magnusson usually does, all the better for those of us who have to deal with emissions testing

 

[AnyMal]

Im not on any similar level of some of yall on this but ive been thinking to ask lately;

I wont be supercharging until our model years have tune capability bc based on what ive read, there is real potential to exceed sensor values or ECU value bounds in a couple areas such as fuel metering, MAF, and probably forgetting the rest not to mention this thread in general and Harrop’s “assurances”. Also, im not sure if supercharging down the line at 100K miles is the right way to do things.
But can yall remind what the biggest physical mechanical danger would be to the engine? Timing based issues?
(This is assuming all components down the line are capable of handling the added power like trans etc.)
Im not sure what comes with the territory on this engine. Bent rods? Impacting cylinder heads? Blowing gaskets? Cooling issues?

Second;
Does anyone have a link or video for LC/LX or Tundra power gains for just intake and exhaust?
Id love a little more power sure, but I kind of want some more sound, fun and character out of the V8 if im going to pay for the fuel lol.
If i can gain maybe around 10% that would be worth spending the coin I think. At least a TRD intake isnt costly but ive only seen seat of the pants videos. Not sure ppl are dynoing a drop in filter lol.

Also, kudos to those who do have the SC and tune. Must be really nice to have that kind of muscle along with the refinement of the LX.

 

[Docwyte]

Sadly you're not going to gain 40hp with an intake and an exhaust. You'll make more noise, so if that's what you want you'll be happy. As far as what a supercharger will do reliability wise, it'll shorten overall engine health. If the tune isn't right you could end up putting holes in the pistons or other catastrophic engine failure.

 

[AnyMal]

Sadly you're not going to gain 40hp with an intake and an exhaust. You'll make more noise, so if that's what you want you'll be happy. As far as what a supercharger will do reliability wise, it'll shorten overall engine health. If the tune isn't right you could end up putting holes in the pistons or other catastrophic engine failure.

Thanks.

I guessed the TRD filter is pointless but im still not sure why they make that and the airbox in the first place?

Regarding exhaust, which again TRD made for the Tundra, the LX is so beyond quiet for it’s engine its hard to not think theres got to be a lot of restriction going on.

I looked at headers before, and add that to an actual exhaust system, you’re talking what like $5-6k? Anything below at least 10% gain makes it a complete waste of money. And of course add the risk of drone.

Ill do more searching around tundra forums and keep the dream alive in my head for now

 

[Docwyte]

To make money! There simply isn't a +40hp gain to be had with an intake and exhaust. Don't mistake the exhaust being quiet with it being restrictive, those are mutually exclusive traits. You can spend a ton of money on headers, new cats, new exhaust and an intake and still end up disappointed if you're looking for a real "seat of the pants" horsepower gain....

 

[woodford]

I have direct experience of installing the Harrop kit myself. Other than a fit issue with the fuel pump provided in the kit (related to clocking of the housing on the Deutsch MotorWerks pump which Harrop quickly addressed) the fitment was easy- a little less involved under the hood than the TRD kit I fitted to an FJ some years back, but pulling the fuel tank to swap the pump was a pain.

Performance has been fine, no significant change to fuel consumption but I am constrained now to use premium fuel.

I admit most of the time the extra performance isn’t needed, but driving at altitude is now much improved (around Tahoe for example). Much better pull off the line if you give it the boot, and less hunting for gears on climbs though the cruise control seems to have a hard time accounting for the extra performance at times. The whine from the charger is only heard under boost and is pleasant.

I’m happy to connect directly if you want specifics on the install…lots of negativity here from those who haven’t been there/done that. If there are any known failures attributable to a Harrop charger install on a 3UR I’ve yet to hear about it…I’m all ears though.

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I'm interested in this mod because the trailer I like is creating a stock tow rating at the very upper max. Exactly how does this impact the tow rating? Thanks for helping me. I'm looking at the 2020 LC & a 28-33' airstream but the 28' has stock LC maxed out.