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Old 05-19-2009, 04:46 AM   #16
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i hear yea, if your looking to get the best out of your racing, the 21 is what most every pro picks, and its not because of mileage. if your just into having fun and you dont plan on putting a 28 into the new lightweight trucks EVER, then try it. im not a big fan of pico motors but some love them. just dont let the big jumps move you to the 28, a 21 with pipe/clutch springs will do every jump that a buggy can do. its real easy to over drive a 28 and slow yourself down and the extra power will wear drivetrain parts out faster. but if your just looking to have fun maybe even look at some other motors. some manf. are now making 24's. im not trying to sell you on which way to go here just trying to give you the facts, only you know what your looking for.
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Old 05-19-2009, 06:30 AM   #17
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I just recently put a .28 GRP in my 8T 2.0 and I gotta say I love the extra power easier jumps and I could pull away from anything, but it did cost me the a-main. I was getting 8-9 min all day long and then the weather changed a little bit and well it dropped to 5 min per tank. I ran out of gas and had to pit every 5 min after that. I burned a ton of fuel and was only able to fight my way back to 4th. This was the first race I used the .28. The next day I put it up for sale and its sold. .21's are so much more versatile and the gain you get with the .28 in my opinion is not worth the 2 extra pits on a 30 min main.
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Old 05-19-2009, 07:47 AM   #18
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Originally Posted by Frank L View Post
I just recently put a .28 GRP in my 8T 2.0 and I gotta say I love the extra power easier jumps and I could pull away from anything, but it did cost me the a-main. I was getting 8-9 min all day long and then the weather changed a little bit and well it dropped to 5 min per tank. I ran out of gas and had to pit every 5 min after that. I burned a ton of fuel and was only able to fight my way back to 4th. This was the first race I used the .28. The next day I put it up for sale and its sold. .21's are so much more versatile and the gain you get with the .28 in my opinion is not worth the 2 extra pits on a 30 min main.

wow 5 min on a mod .28 ?
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Old 06-01-2009, 01:43 AM   #19
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wow 5 mins on a tank from a .28
i mostly run 28's in my truggies and have never had such short run times
even a mild 28 is a bit to much for the track i run on
but i refuse to run a 21 just because everyone else runs one here
i take that back
theres a few of us that run .28's including the guy that won the a-main for truggy here
os xz's
we all make the 8min qualifiers with a little extra fuel to spare
and we're basically running a few feet above sea level
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Old 06-01-2009, 07:37 AM   #20
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8 min quali's With Fuel left on a .28.........I find that a little hard to believe....but fuel economy numbers are all over the place...so i guess its possible....which .28's are you running ?
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Old 06-01-2009, 08:17 AM   #21
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8 min quali's With Fuel left on a .28.........I find that a little hard to believe....but fuel economy numbers are all over the place...so i guess its possible....which .28's are you running ?
Well personally, I run a Force .28 that I have done some mild porting on (lower exhaust port floor/crank work) and this past Saturday ran 8 min. qualifiers and had between 30 and 35 cc of fuel left I've got it in my Jammin (not a lightweight) and I was a little lean on the bottom but it was pouring out smoke on the top. I was pleasantly surprised myself on getting that kind of runtime. I love having that extra power in the truggy because I also run on a tight technical track and it makes it so much easier to clear jumps although it is very easy to overdrive. I put a Force .28 in my truck because it was cheap ($110 at my LHS) and easy to tune. I've had great luck with them in the past (when I was a noobie) and thought I'd try one and see how long it would last if it was actually tuned right and taken car of Last year I ran a Picco P7r Evo in the truggy and it was really good, but the .28 definitely puts a smile on your face
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Old 06-02-2009, 12:10 AM   #22
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8 min quali's With Fuel left on a .28.........I find that a little hard to believe....but fuel economy numbers are all over the place...so i guess its possible....which .28's are you running ?
i stated its an os xz
2060sc pipe/header combo
20% byrons gen 2 fuel
in a 801xt with stock 13t cb and spur
i run the bigger of the 2 restrictors that come with the engine
we do 2 8min quali's
my first quali i came in for a splash and my pitman said i had more
than enough fuel to finish the whole 8
the next quali i went the whole 8 and had a bit more fuel left over

someone also runs the same engine in his losi 2.0
with a 7mm restrictor from nr
and a thunder tiger pipe
i asked why that pipe and he said fuel economy
he just makes the 8 minutes with a little less fuel left over then me
considering he's substantially faster then i am

8 minutes on a tank with a .28 hard to believe?
i don't see any reason why
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Old 06-02-2009, 12:58 AM   #23
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ANything other than the 8ight-T you need a .28
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Old 06-02-2009, 03:25 AM   #24
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Originally Posted by cheapskate.brok View Post
ANything other than the 8ight-T you need a .28
nah the 801 really doesn't need a .28
it really is to much engine for the truck especially on the track i go to
thing is, the vast majority of people that go there run .21's
i find it funny that they come in for fuel at around 8 minutes
and the guys with .28's are doing the same thing
they just lost one of their bigger advantages over people who run .28's
honestly though i would have an easier time getting around the track
with a 21...and then you'd see me show up with a losi 2.0
and then i'd just be driving another cookie cutter truck
with the same diff oil, shock oil, roll center, tires, etc as everyone else
i just get a bigger smile on my face with a truck that nobody else runs
here with an engine that gets bad mileage
then run what everyone else is

thats a bit off topic but as for the question of this thread
.21 or .28?
heck get both
if thats not an option
and you go with a .21
learn to hold a little more speed into turns and keep your shiny side up more
if you go with a .28 and its to much power tune it down
you have so much options you can do
hell some companies make in between engines like .25's
you could also consider that as an option

thx and enjoy the hobby
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Old 06-02-2009, 03:46 AM   #25
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ANything other than the 8ight-T you need a .28
Hmmm... I run a VSPEC in my truck... it isn't an 8ight-T. Plenty of power... it will balloon the tires with a bit too much throttle. On most layouts I get 10+ (sometimes more like 12+) minutes of runtime, although of course that varies based on track layout.

I also ran a friend's C6BB in this truck before. That motor is just "stupid." It would "come on the pipe" and yank the front wheels off the ground. Lots of fun, but smoother would probably be faster...
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Old 06-03-2009, 04:08 PM   #26
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My son (9) runs a Werks B-3 With a v-spec carb and a dynamite pipe.Tons of power and it runs over 10mins!!!
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