LRP ZR.30 X Engine Review Reviews

LRP ZR.30 X Engine Review

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LRP ZR.30 X Engine Review


Distributed in North America by Team Associated, the LRP engines are well known by many racers and bashers. The big blue head and the black case make them easy to recognize. Two versions of the LRP .30 are available. A more oriented monster truck pullstart version (ZR.30 Spec.2 Pullstart) with 5+1 ports good for 4.12HP and 33 200RPM. The second engine is a non pullstart truggy version (ZR.30 X Competition) with a 7+1 ports design good for an outstanding 4.21HP and 38 300RPM. Both engines fit where a .21 or a .28 engine fits no modification are required.

ZR.30 Spec.2 Pull Start Specs

  • Part number: LRP32810
  • Massive all-new XTEC T6 crankcase
  • Flow-optimized LRP XTEC PowerCarb 2 15S-2 carburetor with 9mm inlet
  • New CoolDown cylinder head with extra-thin ribs for weight reduction and uniform heat dissipation
  • Standard burn room for easy tuning
  • Reinforced pullstart
  • Extra-strong connecting rod specifically designed for .30-sized engines
  • 5+1 ports = extra torque for monster trucks
  • Rear exhaust
  • Displacement .30 (4.92ccm)
  • Max. RPM 33,200
  • Max. Power 4.12HP


ZR.30 X Competition, non-pullstart

  • Part number: LRP32815
  • Massive all-new XTEC T6 crankcase
  • Completely new, flow optimized LRP XTEC thermal-protected PowerCarb 2 15SV-2 carburetor
  • New CoolDown cylinder head with extra-thin ribs and additional holes for weight reduction and uniform heat dissipation
  • Standard burn room for easy tuning
  • Ports timed for competition use
  • Extra-strong connecting rod specifically designed for .30-sized engines
  • Flow-optimized backplate
  • Blue anodized 7.5, 8.5, and 9.0mm venturi inserts
  • 7+1 ports
  • Rear exhaust
  • Displacement .30 (4.92ccm)
  • Max. RPM 38,300
  • Max. Power 4.21HP


To test the LRP ZR.30 X, I installed the engine into my Team Associated RC8 buggy. Yes, a buggy! Why? Just to feel the difference between my .21 race engine and the LRP ZR.30 X. To break in the engine, I did exactly what I did for many years now (Read our break in article). I started the engine with a rich setting, kept its temp somewhere in the 180F-190F for the first tank and let it cool with the piston at the bottom dead center for 15 minutes between each tanks. The engine was tight and I had to loosen the glow plug to help starting, few bumps on the starter box and the engine started. The new PowerCarb 2 15SV-2 carburetor was correctly adjusted from the factory; I didn’t have to tune the engine for the first tank. I let the buggy on the ground and did few blips on the throttle once and a while to prevent the engine from flooding. For the next six tanks, I slowly ran the buggy and leaned the engine at every tank. I used a total of seven tanks to completely break in the engine even if the instruction manual recommends four tanks just to make sure the engine was correctly broken in. At each tank, I approximately leaned the high speed needle 1/8 turn.

LRP ZR.30 X Engine Review Reviews

Seven tanks later, I was curious to see how a completely broken in LRP ZR.30 X can perform. There is no word to describe all the power delivered by this engine. This is the most powerful engine I ever tested. My buggy has never been that fast… I mean crazy fast. I did few high speed passes in the street to estimate the top speed. The top speed was slightly the same compared to my .21 race engine at the exception that I could add few extra teeth to the clutch bell to gain more speed without killing the accelerations. The massive torque made the four tires loose traction on any surface any time at any speed. You can expect the same results with any vehicles you’ll drop the LRP ZR.30 X into.

LRP ZR.30 X Engine Review Reviews

Run after run the engine temperature still in the 230F range, I didn’t had to tune the needles settings since I completed the break in and I still run the original glow plug. There is no on/off feeling when driving the engine. The power band is smooth with good response in the middle. LRP included a 7.5, 8.5, and a 9.0mm carburetor inserts if you ever want to hold on few ponies home. Fuel mileage was also excellent considering the size of this engine. I can run my buggy for 7-8 minutes before filling up the 125cc fuel tank in bashing conditions.

LRP ZR.30 X Engine Review Reviews


I have raced LRP .28 engines (Read LRP 28 review) in the past two years, no flame out, always easy to tune and they still perform well after many races. You can expect the same scenario with the LRP .30 engines. They are strong, powerful and really easy to tune. This is exactly what I look for when I buy a new engine. Both engines are affordable, the price asked for the pullstart version is 200$us and 220$us for the Competition non pullstart version. They can turn any vehicles into a rocket. If you want to break top speed records and make your monster truck pulls wheelies on demand without breaking the bank, the LRP .30 engines are definitively the engines you should have.

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Sylvain Lafrance

Sylvain Lafrance

Hello, my name is Sylvain Lafrance and I am the man behind I have bought my first hobby grade RC in the early 90s. With years, what that started as a simple hobby, quickly became a strong passion. I am so much passionate about R/C that I have created in 2006 to share my experiences with R/C products that I use for racing and bashing. Follow me !

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19 thoughts on “LRP ZR.30 X Engine Review

  1. Hi,

    Nice review. I am very satisfied with my LRP .28 as well.
    Great engine.

    What pipe did you use during the testing?

    I havce run both 053 and 086 on mine, and like theme both.

  2. I just bought the zr30 pullstart and an Inferno GT2 I’m not going to even start the gxr28 its going right up for sale on rcuniverse or ebay I think its going to be very fast I learn my lesson with factory engines a long time ago I’ll post after break in later

  3. i have this motor in my revo and its insane highly recomended the only thing i dont like is that it likes fuel too much but its worth it. because when people run their jatos and tmaxx’s they get left behind

  4. I installed the ZR30 in my Savage X. Along with a 3 speed transmission, 19/47 gears and a RDlogics dual exhaust system. Lowered the suspension. I now have a truck that runs with my Traxxas 4tec. Road rage tires on bead lock wheels. On 20% nitro this engine sounds like a weedeater on steroids.

  5. I have two ofna dm1 1/7ths, one RTR with a factory motor, and a pro with this beast and a jp4 pipe… I was used to the RTR car since I ran that one while building this one. No words can describe the difference between the two cars. The ofna .28 I’d nice, good for close to 60mph. This thing is crazy, and BLOWS the .28 away. I can spin foam tires at will up to insane speeds. Even during early break in tanks at 1/4 throttle this car was nuts.. I love it!

  6. I have the ZR.30 Spec2 in my Hyper ST and it is well match. The truggy is stable, fast and very torquey with this fitted. Makes the Macstar .28 look like a dead horse.

  7. I was lucky enough to find a lrp .28 spec 3 w/pull start and the traxxas bb conversion for Revo and was told I could take both for $100 but I would HAVE to cut/mod my Revo to get it to work and that is why he was selling it. I took the motor to my local hobby shop where they told me about the new era conversion kit that required no cutting or mods. After I broke the motor in and ran a tank through it I RAN to the hobby shop to get the .30 spec2. I have not started the spec 2 but the spec 3 is outrageous and I can barley wait for the other bb conversion kit so I can mount the spec 2 to my other Revo (the one that now sits in the corner) and compare them… I will update when I do and let everyone know what I think of the two compared(both my Revo’s are very similar in weight)

  8. hi just woundering if you can help trying to decide on 2 engines for my savvy 25 looking at the lrp 30 or the picco which would be the better for both bottom end and great top speed or insane your help would be great thanks

    1. Hello,

      I’ve ram both engines in a Monster GT. The Picco .28 has more RPM but the LRP .30 has more torque. My favorite is the LRP because it is easier to tune and holds its tune better.

      I have a LRP .28 with 7 gallons and it still going strong so the .30 should last as long.

      Hope this helps.

  9. This moter is insane I just put one in a redcat avalanche the ZR30 Competion woprds can not describe to much power. FYI the sp2 pull start will fit on the ZR.30 competion with no modifications if you want to add a pull start or rotor start. Great engine,

    1. Thinking of getting this for my MGT 8.0. will I see a performance upgrade worth the money? and will it blow out my transmission like the .50 does?

  10. It is an old review, if my memory is good, it was Trinity Monster 30%. You can run this engine with any 20% to 30% fuel with no problems.

  11. I have one in my revo and I can truly say that the muthaf&cka is NASTY!!!!! and I have one in my bb jato and as of right now I’m untouchable no one has out run me yet…. so I say the .30 is a rare BEAST!!!!!!!……. its almost one of a kind!!!!!!!

  12. I’ve had good luck with the LRP28S3’s over the years. Put my first one in a losi aftershock. It destroyed the cheap owb mechanism and I swapped it out of the LST2. Dropped the tires to a smaller/lighter set of 3.2’s (I know, old stuff), got a +2 CB from RC-Monster and did the transmission gear flip mod which was good for +1 over stock CB. Great little engine. Ran it for a couple years in that truck, then sold the truck. Later sold my buddy the engine.

    Got a second one for a big block revo with the new era kit. Required full RRP gears in the trans w/o reverse, but otherwise held up ok.

    Got a 3rd a few years later for savage X. Had issues with that one, then I replaced it with the LRP30S2. The issues persisted. Pretty sure it was the 125cc fuel tank I had on there leaking out of the cap and had a weak spring. I replaced the tank, then the 30 ran great. Never tried putting the 28 back in. I should, it’s plenty of power for a savage x.

    I lost track of my first LRP28S3. It had 8 or 9 gallons through it when I sold it to my friend. He put it in an extended savage and ran 2 or 3 gallons through it before we lost touch.

    Now I’m pretty heavy into brushless, but I still have my BB revo and SavageX on the shelf. Will try and get some wheel time with those next season.

    Glad to see LRP is coming back. They stopped making engines for a while.

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