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Old 08-15-2007, 02:26 PM   #1
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Default os engine help

hi guys...

just ran in my KONDO custom mod OS 5tz......here are some response and questions:

1.what would be a healthy range of temperature to run a mod engine?

2.buddy 1 says the even poorer low end as compare to a stock 5tz is a result of the inherent problem of a 5 port engine.....just downsize the pinion gear.

3. buddy 2 : he adjusted the mid range needle...the car becomes more alive..low end better but still not fantastic...top end is fast...

any help or comments welcome.....
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Old 08-15-2007, 04:07 PM   #2
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SOMETHINGS TO TRY
1 LEAN BOTTOM END,WHEN YOUR BUDDY ADJUSTED THE MID RANGE HE PROBABLY TURNED IT IN,THUS LEANNING THE LOW END.THE MIDRANGE SHOULD BE FLUSH WITH THE CARB BODY.
2 TEMP ANY WHERE BETWEEN 200- 280, GET THE MOTOR TO RUN STRONG
AND STILL LEAVE A SMOKE TRAIL.
3 PLUG USE A OS 6 FOR SHORT TRACKS,,A 7 FOR LARGER TRACKS(125 FT OR LONGER STRAIGHT)
THE 6 IS A HOT PLUG BUT WILL GIVE YOU HARD ACCELERATION,BUT A LITTLE SLOWER ON THE TOP COMPARED TO A 7 IS A COLDER PLUG.
HOPE THIS HELPS
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Old 08-15-2007, 06:18 PM   #3
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Put a harder clutch spring in so the rpm's are a little higher when it engages.

Last edited by THE DOCTOR; 08-17-2007 at 06:51 PM. Reason: spelling
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Old 08-15-2007, 06:36 PM   #4
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Quote:
Originally Posted by erric_13 View Post
hi guys...

just ran in my KONDO custom mod OS 5tz......here are some response and questions:

1.what would be a healthy range of temperature to run a mod engine?

2.buddy 1 says the even poorer low end as compare to a stock 5tz is a result of the inherent problem of a 5 port engine.....just downsize the pinion gear.

3. buddy 2 : he adjusted the mid range needle...the car becomes more alive..low end better but still not fantastic...top end is fast...

any help or comments welcome.....
Why would you buy a Mod motor and a 5 port at that, when you're really not good at tuning motors??? That motor should be no harder to tune then any other OS TZ... and the OS TZ is super easy to tune, just follow the OS instruction manual that should have came along with that motor. The mid-range is set at the factory... You and your buddy should only touch/tune it only if you really know what you're doing... You really don't want to blow $300.00-$400.00 dollars on a mod motor just because of a bad tune and the breakin was done wrong....02

RC_Alan

Last edited by rc_alan; 08-15-2007 at 06:50 PM.
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Old 08-15-2007, 06:50 PM   #5
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What pipe are you running with this motor?
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Old 08-16-2007, 10:27 AM   #6
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thanks guys for all ur inputs....

i am running it with a skyline vr plus pipe.....my track is rather short and low end punch means a huge difference.....i was running aa stock 5tz....just tot of trying something faster....not trying to be funny...gotta start somewhere i supposed...have a red dot coming in soon...
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Old 08-16-2007, 11:58 AM   #7
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Default Clutch

As posted earlier the clutch can make a good engine seem slow. Make the clutch come in at a higher rpm and it will be faster everywhere.
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Old 08-16-2007, 12:53 PM   #8
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Quote:
Originally Posted by erric_13 View Post
thanks guys for all ur inputs....

i am running it with a skyline vr plus pipe.....my track is rather short and low end punch means a huge difference.....i was running aa stock 5tz....just tot of trying something faster....not trying to be funny...gotta start somewhere i supposed...have a red dot coming in soon...
Well, you got the right pipe. What car are you running? Have you tried dropping a tooth on your 1st gear pinon. On a very smaller technical tracks, that will add a lot of zip on the low end.

As mentioned, clutch adjustment can make a big difference.

BTW - A guy at our track runs a stock 5-port TZ on our technical track and he is very fast.
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Old 08-17-2007, 01:10 PM   #9
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well just gotten new spur to help with the low end.... a smaller pinion as well...gotta reset the setting as seek help from the "god of cars", he promised to bring the engine alive....heard that removing one of the engine head washer helps too....will keep u guys posted....not gonnna tune it to temp...inaccurate guide...
my buddy's murnan mod R3 was sleeping at 110 degrees until it has been tuned to about 130 degree celcius...
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Old 08-17-2007, 03:46 PM   #10
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Try leaning the low end needle. From my experience, OSTZ engines usually are set very rich from the factory both low end needle and high end needle. Also, try to set your cluth to engage a little bit later so as to get the engine to a higher RPM before the clutch engages. Another is try to gear down your pinions. If you are running an RRR, try using the 15T/20T pinion with the standard spurs. I have used this combination for our local tracks which is short and technical. Got very good results with this gear combination on my OSTZ 5ports on the RRR WCE and on my OSSpeed TZ 3ports on the RRR Evo. Also, tune your engine on how it performs and not solely based on the temperature gun readings. Some of the newer engines like to run hot... As for the shims, before removing it, how much nitro percentage are you using? OSTZ engines come from the factory with 2 shims. With the 2 shims installed, the engine can run up to 30% nitro. You can remove eitheir of the 2 shims if you use a lower nitro percentage. Hope this helps...
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Old 08-22-2007, 02:31 PM   #11
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done everything suggested here...changed spurs,pinion,remove heat sink shim,relaced leak gasket,ratio...................................... .................................................. .................................................. .................................................. .................now its FLYING....WOOHOO....this engine rocks!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
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Old 08-22-2007, 03:31 PM   #12
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Quote:
Originally Posted by erric_13 View Post
done everything suggested here...changed spurs,pinion,remove heat sink shim,relaced leak gasket,ratio...................................... .................................................. .................................................. .................................................. .................now its FLYING....WOOHOO....this engine rocks!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
That is great news!
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