350 shim question

[madweazl]

I ordered the turbo head button the other day and saw in the thread that it comes with the requisite shim for 30% and I also noticed one post stating that adding another shim seemed to provide a little more power. So, do I run the original shim, the shim that comes with the turbo button, and another shim for a total of .3?

Running the above on 30% and the RE11 pipe, can I expect to pick up anything on the bottom end (I've seen a few posts that say they picked up power across the RPM range with this setup)?

[madweazl]

Anyone have feedback this week?

[Errorhead]

I've asked this question in another thread and nobody seem to answer me either.:eek:

[madweazl]

I've asked this question in another thread and nobody seem to answer me either.:eek:

I saw that (I'd also asked in the motor thread) and decided to make a thread dedicated to the subject but I guess that didnt work either.

Anyways, I installed the button today using 2 .2mm and 1 .1mm. I'll keep you posted.

[madweazl]

OK, having a bit of a tuning issue here. I picked up the metal carb ball today and set off to dial the motor in. On the top end it will really start to sound good but when I let off the throttle it will continue to rev a few seconds (not flat out but at about 40% throttle it feels like). If I fatten it up a bit the problem goes away but it doesnt quite sound like it's making full power.

Since the condition seems to go away when I run it a bit richer I can assume it's just a lean condition but I cant quite find the sweet spot within 1 hour changes of the HSN. Low side feels really good. Any ideas?

Oh yea, I'm running 30% with 2 .2mm and 1 .1mm shims with a P4 super hot. Plug is a nice gray and appears distortion free.

[bones]

I purchased to turbo head yesterday and talked with the owner of the hobby shop who also races losi products and mine came with three shims and the guy told me to use the three shims that came with the turbo head and also use the shim that was already on the motor for a total of 4 shims. Juat got it installed and will have to get some 30% fuel and try it this weekend and see how it does and will post result.

[bones]

I ran my buggy today using the turbo head with 4 shims on it and it fired right up and no real problems in tuning it. still have a little more fine tuning to go but dont forsee any problems with it. cant believe it is the same motor also using the re11 pipe on it.

[KJ1]

different motor, but the re11 pipe made my engine pull more power throughout the whole power band, from top to bottom. I was using jp3 before that.

[David Spashett]

Hello
In the UK we have just started to use the 350 engines converted with the Turbo Head button. Initially when running-in the engine it took a few tanks to settle down, but now the performance is very stable and needs little or no adjustment race to race. We have been adding a total of .6mm headshim and using the supplied plugs. We have tried different plugs and we can improve the performance slightly but we have found with the standard plug we gain stability of tuning and a strong idle. We use 30% Nitrotane and the RE11 pipe. Again we have tried different pipes and yes they all change the performance slightly but we do still always return to the RE11.
I hope this information helps.
David

[madweazl]

Hello
In the UK we have just started to use the 350 engines converted with the Turbo Head button. Initially when running-in the engine it took a few tanks to settle down, but now the performance is very stable and needs little or no adjustment race to race. We have been adding a total of .6mm headshim and using the supplied plugs. We have tried different plugs and we can improve the performance slightly but we have found with the standard plug we gain stability of tuning and a strong idle. We use 30% Nitrotane and the RE11 pipe. Again we have tried different pipes and yes they all change the performance slightly but we do still always return to the RE11.
I hope this information helps.
David

I ran the same setup on a P4 Super Hot but couldnt seem to get it running good on top. When the motor would really start to make power on the top it seemed to lean out; it would sound great but when I'd let off the throttle it would hang at what I can only describe at about 40% throttle for a few seconds before dropping back down to a normal/slightly fast idle. Would the glow plug have any impact on this (I didnt try the supplied plugs)?

It made decent power when tuned so this condition didnt happen but I cant confirm that it was any better than the 350 running 20% on the RTR pipe.

[David Spashett]

Hello
This seems to me that you are having to lean the engine out too far to get it to make good power. This is a symptom of a very hot Glow plug and possibly the bottom end to lean, you could also try making the gearing a little lower to compensate? We have been using a 13 clutch bell with either 46, 47 or 48 depending on the track length.
Hope this helps
DS

[madweazl]

Thanks for the info; I'll give the other plug a shot and retune.

[madweazl]

What a difference! I cant believe how much stronger it is. I never would have thought a plug would make that much difference. It was an absolute rocket. My only complaints is runtime, I'm getting 7m 55s :( Good enough for my 15 minute mains but I was a bit disappointed after hearing others claiming 10 minutes.

[David Spashett]

Hello
I am so glad this information helped you.
7m55 this is good and very respectable. As you say it's an "Absolute Rocket" so i would leave well alone, go racing and enjoy. In time as the engine breaks in further you may well be able to lean the engine out further to gain better fuel consuption but don't try and ask the engine to do something it cannot.
Best of luck
David

[madweazl]

Hello
I am so glad this information helped you.
7m55 this is good and very respectable. As you say it's an "Absolute Rocket" so i would leave well alone, go racing and enjoy. In time as the engine breaks in further you may well be able to lean the engine out further to gain better fuel consuption but don't try and ask the engine to do something it cannot.
Best of luck
David

Had one other question for you. The engine was running about 205 through this and was leaning out during the main (motor continuing to run at higher RPM after letting off the throttle like it did previously). Given the power it was making I'm not worried about hurting performance by fattening it up but this will hurt run time further. What kind of temps and run times are you getting?

[David Spashett]

Hello
In the UK we have seen running temps from as little as 200 up to 235 depending on the car, set-up and conditions. When making good power we have been able to get between 8 and 9minutes from a tank.
If your engine is leaning out during the run i would say that you have missed your tune very slightly on one end this could also explain why the engine is hanging on.
All the best
DS