Harrop Supercharger Stage 1 - LX 570 Drivetrain Reliability ?

[Moby]

Yeah, I just read a bunch on the tundra forum. Really interesting. I will do a Unichip and bigger injectors if I do this even just at stage 1.

 

[Docwyte]

I can see this for monetary reasons, but personally I'd trust a custom tune over a "canned" tune even if it's from Magnuson. The tuner I used is who Slee trusted to tune their Harrop supecharged LX. From what I understand he leans heavily into the conservative side when tuning. I've heard from a local 3ur Tundra that his Maggie 2650 tune (at 7,000ft in Avon, CO) was running 11.4 AFR at WOT. Also heard that the Toyota rings like things richer to stay happy so having a custom tune to put ARF in the mid 10's may be considered safer. I put my trust in the tuners hands.

I have a 2018 LX and I have mine tuned locally in Denver without sending out to Matt in Korea. I have the 360T11 ecu calibration id. Tuners who use VF tuner, previously OV tuner I believe, should be able to tune the 16-18's.


Yea, if you changed anything from the stock kit provided I wouldn't even drive it across town for a tune. Stock injectors, pulley, intake you are fine to drive it. I have the Harrop w/ stock 85mm pulley, the DW 340lph fuel pump that came with it, 775cc injectors, and 1 step colder (ikh22) NGK plugs. Still yet to install the smaller 77.5mm pulley. So I have all the required additional mods for stage 2 just haven't done it yet.


Good point, no idea. Yes, I agree. From my experience with Land Cruisers the reason people tend to upgrade isn't typically because of powertrain issues. It's just because it seems "old" and they want the newer creature comforts that a more modern vehicle offers. I guess I'm willing to take the calculated risk and higher level of maintenance.

No, I don't want a custom tune. One of the huge selling points of the Magnusson kit is that the tune is 50 state legal, with a Carb EO number. I have to deal with emissions here on the Front Range and they're beginning to fail people with tunes.

 

[residualboulders]

anyone compared the magnuson and harrop back to back? I've heard on paper the Harrop outperforms but in real life the magnuson is a more fun driving experience.

 

[Sajan]

Bumping this back up!

Any additional feedback from folks that have the Harrop stage 1?

 

[c4xplsv]

I've had the Harrop Stage 1 on my 2014 LC for about 15k miles (installed July 2024) - no issues. love it... should have been this way from Toyota

This is my DD - got a lot of seat time. This and carplay make the car a long term keeper (10+ years already).

 

[c4xplsv]

anyone compared the magnuson and harrop back to back? I've heard on paper the Harrop outperforms but in real life the magnuson is a more fun driving experience.

For starters, we'd have to baseline 'more fun' in context. In my own personal experience, pulling from 60 to 80 when needing to pass is 'more fun' with "more power".... not sure how else to define that one? The Harrop is objectively better designed when it comes to the cooling system. This pertains to intercooler design and lack of O Rings sandwiched in-between plates to leak over time. The Harrop intercoolers are larger which is the biggest benefit IMO.

video explaining the differences

 

[Sajan]

Did you do a tune? upgraded fuel injectors?

 

[c4xplsv]

Did you do a tune? upgraded fuel injectors?

no, the stage 1 kit only needs the high flow fuel pump - if you went beyond that then you'd have to do the tune and injectors. I wouldn't bother unless you want to build the bottom end - and I don't.

 

[Sajan]

no, the stage 1 kit only needs the high flow fuel pump - if you went beyond that then you'd have to do the tune and injectors. I wouldn't bother unless you want to build the bottom end - and I don't.

But you have to run 93 gas right?
That's one concern for me since 93 is not readily available in a lot of states.
Plenty in Texas but premium in Colorado is 91?

 

[c4xplsv]

But you have to run 93 gas right?
That's one concern for me since 93 is not readily available in a lot of states.
Plenty in Texas but premium in Colorado is 91?

91 is all we have here too

As long as you are at least 91 it’ll be ok

 

[Sajan]

91 is all we have here too

As long as you are at least 91 it’ll be ok

Harrop says one thing on the tech note, Tundra forums say another..hmm

To summarize, Harrop recognise a tuned option would be best. Where one does not exist, Harrop opted to test the operation of the stock tune with the Supercharger and are content that the modest boost upgrade of the Stage 1 kit works within the limits of the factory tune. The parameters of the stock tune extend satisfactorily to within the increased airflow of the upgrade as is evident by timing and knock control when combined with 98RON (93 AKI) fuel, component enrichment protection, increased shift torque reduction and the absence of modification induced MIL light from increased air flow.

"Stage 1 Harrops" REQUIRE larger injectors. Stock injectors max out at 5000rpm and the engine becomes dangerously underfueled. 535cc injectors minimum are recommended, ideally 650cc or larger if additional modifications are planned.
"Stage 1 Harrops" should be tuned. The stock tune experiences knock, delayed fuel enrichment, and other issues.

 

[c4xplsv]

We just did whatever the kit came with - figured if they wanted larger injectors then they'd have sold it that way. So far, no issues and I've got 145k on the clock. I also did a Dobinson lift and a Wilwood BBK on front/back - not your normal LC upgrade path for most. YMMV

FYI - Ed Martin Toyota did these on brand new LC's as-is.

 

[Moby]

Magnuson now offers full support for their superchargers through '21, including injectors and a tune.

 

[kong24680]

Harrop says one thing on the tech note, Tundra forums say another..hmm

Listen to the Tundra guys and get the upgraded injectors and custom tune if you are going with the Harrop. Running an aftermarket supercharger with no tune is absolute nonsense and the data from the Tundra forums proves it. It is not much more money for injectors and tuning and the truck will run way better, smoother, more efficient, and with more power.

 

[PJS]

Bumping this back up!

Any additional feedback from folks that have the Harrop stage 1?

I have had the Harrop on my 21 HE since new with no issues - standard install, no tune, 91 octane fuel - now at 40K miles

I am sure, as others have mentioned, that super charging without a tune is not ideal - however my experience in the 40K miles is that it is far better than stock and trouble free to date. My use case is mixed city and highway driving primarily.

The car is still "slow" per se but things like merging and high way passing are non issues.

Feels OEM

100% would do it again.