When ever I give my car full throttle very quickly, it seems to hesitate and then accelerate normally. I did the pinch test to see if it was the LSN and it took around 3 seconds to shut off with a slight raise in RPM. I have got smoke and power at full throttle. My temps are between 230 and 250 depending if I'm on grass or on tarmac. I looked everywhere and I cant find out what the problem is.

-turbo

Just a quick guess, it sound like it is lean on the bottom end needle

Lean the lsn an hour at a time to see if it improves...

The engine tune could be fine, but it might be your clutch kicking in too early. Since you are running on grass and tarmac, your traction is pretty high and you might want to use stiffer clutch springs, so the engine can spool up more before the clutch engages.

Ok, I will try tune the LSN a bit more Tomorrow and see how it goes. As for the clutch spring, I just replaced it last week and they seem to be very stiff.

Which servo are you running and what engine? The reason I ask, I ran into a similar problem. I had a hesitation that COULD NOT be tuned out. It drove me crazy for about 2 weeks. On a slow or smooth throttle pull the engine was fine, quick blips or stabs of full throttle and it would lean bog. Had 2 other people try to tune it out and they couldnt either. Swapped engines and it did the same thing. The servo I was using had a transit time of .04 sec at 7.4 volts. I moved to a servo at .07 sec and the issue went away.

In my thinking it seems the servo was simply too fast for the engine to respond to. There is a point where fast is just too fast.

Sounds like you are to lean on the LSN. Open it up 1 to 1.5 hours and its should go away.

That is exactly how my engine is reacting. I am using the stock HPI Racing HPI SF-10W Servo (Waterproof/4.5kg-cm6.0V).

I've had a servo making my engine flame out everytime, changed engines, clutches, fuel lines, tank, carburators.. After all it was my servo doing it after 2 years of use

I would start by flushing out hsn , then setting the lsn about 3/4 turn richer than it is , setting hsn maybe 2-3 hrs richer than where it is after you pull it and flush
Turn hsn in until it stops , count how far in you go by half turn increments , take hsn out , leave all of the fuel delivery system hooked up, take pressure line off and blow through until fuel comes out of the hsn housing , replace hsn and turn in until you are in the ball park of where it was , restart and try again

If it very rich , you probably had something stuck in hsn

something to remember... It run away on you right? It free wheeled at full throttle for a short bit of time? this might have ALOT to do with your tuning issue. That's why I said to lean lsn. Your engine is probably a BIT free er, more broke-in so to speak. lots of advise coming your way, but start off with the simple stuff first so your not chasing something that doesn't exsist.... good luck...

Wow , where did you see the runaway part Shane?

different post from op the other day i believe

http://www.rctech.net/forum/nitro-of...ay-truggy.html

I see , kinda what I figured but I didn't read that one

Hope you get it figured out bro , good luck