+1 i dont drive a losi ...but that looks like trouble ...looks like its gonna rub the thingy

I ended up pulling the engine and clearancing the center diff top plate a little more so even with the chassis flex the boot doesn't touch at all now.....



On another note:

How many shims does everyone use with their GRP .21's? I'm currently breaking in the GRP Non Tuned .21 in my losi and I added one extra 0.1mm shim before I started it just to take a tad bit of compression away. I'm running 30% fuel right now. Are the non tuned engines shimmed from the factory for 30%? So once I finish break in should I remove that extra shim?

from what i have read on the turbo plug engines, add the extra shim for break in and remove after roughly a gallon. i left the extra shim in just for insurance!

glas you got that sorted it was be inevitable that it was gonna cause a problem

+1 and i have broke mine in with stock shim no probs yet

I broke in my tuned promo yesterday using the heat cycle method. I used a 10th scale foam to insulate the cooling head like Drake suggested and that really works. My car was spitting fuel and barely taking off and still temping slightly over 200. It wouldn't stay running on the initial startup because the original glow plug was shot right out of the box. After about 10 3-4 minute cycles, I put a moderate race tune on it and let her scream a little. I love the way this motor sounds. I'm a Nova guy so the smoothness of this engine was very different, but I know that its smoothness will actually be more beneficial on the track. The compression after a third of a gallon isn't as tight as the nova's, but in my experience with high end motors, most of them are like this but they go on to get 10+ gallons and never miss a beat. Too much compression is just unnecessarily hard on the crank pin and rod. I look forward to running this engine this season.

Hello all, looking for input on the tuned grp promo package. I have only had 1 grp motor ever and it was mugen ninja bo1a, I loved it. Strong smooth usable power but was only disappointed in 1 area, the runtime. I used the recommended pipe and ninja glow plugs but could just barely get 8 mins to a tank in a mbx5r. Is the grp tuned 21 in the promo kit really any better? I have read a lot of testimonials on how these motors get excellent fuel mileage, the same was with the ninja and I never saw it. I know there are a lot of variables but some motors have a reputation to get great fuel economy no matter what the conditions such as the v-spec. Not looking to get flamed but just some good, honest feedback. The price of the promo kit has made it more reasonable to try this motor out, they are on sale everywhere I shop. Also I would be dropping the promo kit in an mbx6 buggy and as some know the chassis is kind of a tight fit when it comes to pipe and manifold selection, so with this being said does the grp pipe and header fit without any major mods? Thanks .

You will love the grp tuned. It gets very good run time. I run the grp 053 pipe and it makes awesome power. I run it on a mbx6 and it fits well

you will love this motor and yes run time is excellent before i ran the grp i had run novarossi and a sirio and the way i drive is alittle heavy on the trigger finger 7.30 miniutes was all i could get no matter what i did. i droped the grp in the exact same car and was getting 10 min. no problem i could not believe it

I also had one of the older GRP ninja bo1a engines in a mbx5r. I was running the ninja pipe on it and tilted 30% fuel and was getting right at 9:30 a tank. I believe I could have pushed it to the 10 minute mark but might have ran out. I loved the older grp engines and the newer ones are just as good if not better.......

all conditions are different and tracks as well ...i have not seen a grp rpomo kit that wouldnt make the 9 minute mark ...most going on 10-11-12 mark if proberly tuned ....i bought one purely based on what i saw at the track ....so far on breaming it in ...i have not been dissapointed and feel in my x2 i should get 10-12 minutes on 150cc if i have the tune right ....

i pitted the last part of the season for jyfz ...i was holding the stopwatch ...so i can vouche for the 9-10 minute mark with him running an
rc8 at the time

the tune makes a big difference! my bo1a gets better mileage than a friends vspec, but another friends vspec gets better mileage than my bo1a. also seems like if the bottom is a little rich, it makes a noticeable difference in mileage for the worse!

I run a GRP .21 in a JAMMIN x1x buggy and a GRP .28 in a X2 truggy. The GRP.28 runs flawless, tons of power, good run time and I rarely touch the needles. My .21 has been a pain in the but. I run a fioroni turbo clutch on both and have recently went to stiffer springs on the clutch and changed from a JP3 and JP4 pipe to a dynamite 053 pipe. Helped out a bunch on the bottom end. The other problem I have had since after break in is at aprox. 1/4- 1/2 throttle it sputters like the bottom is real rich but if I lean the bottom it starts to rev like a lean bog. I have only ran GRP plugs (C5 & C4) once I hit1/2 through wide open it cleans out and runs like a s.o.b. My current needle positions are aprox. 4 1/4 on HSN and 4 3/4 on LSN. I'm stumped, my run time on these settings are parox. 11 - 11 1/2 min. My gut tells me my glow plugs are not burning properly. ANY ADVISE would be appreciated.

THANKS

4 1/4 out from bottom on the hsn ? sounds to rich ..mine are 3.25 out from bottom on the hsn .....on the lsn stock is 6.25 out from bottom ...on the hsn stock is 3.5 truns out from bottom ...its easy to get them scrambled ...your mind is telling you to adjust the hsn like on other motors but the lsn is what you should be adjusting ....in very small turns ...a little goes a long way ..take it back to stock settings ...put a new plug in it ....make sure everything else is sorted .....fuel line , carb sealed ..gas tank ok ....you should be able to dial it back in from there ..i always go back to stock if i think ive got things to far out

Zixxer - Thanks for your help. I didnt get a chance to try it yet but I should this week. I got to get it right for Cullman.

you runnin truggy or buggy or both ...no prob on the help part ...i love rc stuff ..im just glad some peps ran these motors before we did and figured em out for us .....cant wait for cullman