de-restriction works badly and the idle is really bad. (weak at low rpm)

[rickard_89]

hi!

2005 factory ditech with newest engine(europe) now it is totally de-restrictied and the strange part is that i know that the gameboy tune has been done since professionals helped me.

It feels like the middle segment is good but the low and the high speed is terrible. It takes ages to reach 65 in "plain" grounds.

So here it is: I had a 2006 before and it went 54 km/hour without any tune at all, this one is the same model, but manufactored 2005. Original it goes 48 km/h but the issue is that it is bluddering at low rpm and sounds strange, but when you use the gas it goes pretty well but not as well as the last ditech factory I owned.

So I gameboytuned it and the topspeed became 50 km/h and the acceleration is a bit better, but still it is bluddering at low rpm. If you try to start it you need to hold the left breaking-bar and it goes for like 2k rpm until 2.5k rpm and if you stop holding that bar it dies, if you hit the gas to early it dies. So easy to say you cant just start the engine and let it go by itself then it dies. Even if the engine is warm, it is the same thing. And also if you just stand still a while after driving for like 30 minutes it dies itself also if you don't gas until 2k rpm and up.

Now the variator spacer is removed and the topspeed of course increased to around 65km/h flat and around 70km/h with a little downhill; also note that this is engine ONLY has traveled 6000 km and has been used fairly without tuning and also been handed in to the aprilia-partners in november and after it was handed in. The previous owner experienced this error in the summer and he asked the dealers to fix it, but his receipt doesn't tell that they have checked what he asked for and I called them and they told me they didn't knew about this error.

Please give me a few ideas what I should do, a compression test I don't think it will help since it is nearly impossible that the engine is broke. I understand that it has something to do with the engine/the fuels or something.

I assume there are some errors in my grammatic, I wrote this fast and english is not my primary language. Hoping for some help!

/R

[wildchild]

Welcome to the forum. You should get started by reading the sticky posts. There is some great info and help there. You can also creat a signature like the one I have below. This will help everyone diagnose or make suggestions that will ultimately get you a better state of tune. Your english seems to be fine. Do you have a water trap? (read sticky) how old are your belts and rollers? When was the last time your injectors were cleaned? Have you done a compression check on the cylinder? I'm hopeing others may chime in to help you out too.

[Grenadiers]

What is the weight of your rollers? Did you change them? After ECU derestriction, you need toadjust your transmission.... specifically your weights...

[wildchild]

Just curiouse what map are you using for derestriction?

[rickard_89]

I have the same weights that was original and I haven't weight them but I know they're original. the aprilia-dealer have checked the variator and the rings and all of that and that is fine.
How do I clean the injectors?`I don't think it has been done.

how does the water trap look like, is there any performance increase removing it?

[rickard_89]

I think it was the 2.8.0 and the persons that did it has done it on several models and based on my engine and model they used that one since that has prooven to be the best.

the issue at first has nothing to do with the destriction, it was there before. Just the issue is that it doesn't top as much as it should and the acceleration is quite bad for being destricted. And like I wrote I know things has been done and I have tested "normally" - with gameboy tune and without variator spencer.

[Grenadiers]

OK, are you also running with the stock exhaust too?

Your rollers will more then likely need to be changed as they will be to heavy and act as a form of restriction too...

Time to build a Signature to show what you have and have done to your bike...

[rickard_89]

I'll try that, I also noted that they don't use FULLY SYNTETIC OIL it is demi syntetic, can that be a part of the issues? I'm going to buy castrol TTS i guess.
I tried to search for how to edit the sign but coudn't find it either... Yes i'm using original exhaust.

[Grenadiers]

Semi synthetic is fine. If you can find the Castrol TTS, many have found it a very good oil!

In the upper right hand corner of the Forum, click on SETTINGS, then along the left side, you will see "Edit Signature" there you go...

[rickard_89]

I have done it now, but i just wonder how can the speed be so low? I mean 65 straight and 70 a bit downhill is way to little for a destricted ditech, what could the issue be if they have checked variator at the latest service?

and also it is spluttering a lot at low rpm. We tried to do the compression test, but it didn't fit.

So:

1) at low pm spluttering, the engine shuts down if it is going by itself (it is very hard to start, if you drive for like 30 min it shuts down in the red lights if you donthit the gas
2) top speed is around 65 km/h
3) If you drive at low rpm it doesn't sound right at all, the "flow" sounds bad. If you go in like 50 and the rpm rises it sounds a bit better.

Please help we have tried and looked many things but no solution, we have read everything we can but haven't found a clue excatly what it is

[Grenadiers]

Check and see what your Rollers weight is. Also, Install a Water Trap. That should take care of the sputtering and will even give you a bit more RPM/speed and HP as the engine will no longer be trying to burn goo (water and T2 oil that is being pushed along your Air line). Also check your Air Compressor's clamps. Make sure that they are tight and not leaking.

Pull your spark plug and see what kind of condition it's in. What plug are you using? What is it's gap set to?

[rickard_89]

I have checked spark plug and the color is light brown, it looks good and the model of the spark plug is : NGK CR7EKB what do you think guys?

The rollers weight are normal

is it hard to install a water trap? why do I need it?

can you specify this :
"will no longer be trying to burn goo (water and T2 oil that is being pushed along your Air line)?"

[Grenadiers]

The best spark plug you can get for our scoot is the NGK ZMR7AP. Gaped (VERY carefully!!) to between .030 and .035

What is the weight value of your Rollers? (i.e. 6.6Gr, 7.5, 5.0, etc).

No, a water trap is easy even for the novice mechanic to install... It should take you about an hour with all the parts on hand.

Anyone that works with compressed air will tell you that there are 2 by-products of the compressing of air... One is heat, the other is condensed water vapor. With our DiTechs, there is also T2 oil from the crankcase that makes it past the single piston ring of the Compressor. That nice and warm to hot T2 oil is mixed with the water and is pushed along with the compressed air. Next stop... the Air Compressor where is is mixed with the fuel and forced into the Combustion Chamber. Where, as hard as it may try, the spark plug attempts to burn that "goo"... As you know, water doesn't burn... Nor does the T2 oil in that configuration.

The net result is an engine that will sputter and cause you to loose horse power and speed as well as cause SLOP (Sudden Loss of Power). Add to that prematurely fouling spark plugs...

The Water Trap intercepts that goo BEFORE it can make its way to the Fuel and Air Injectors...

Read the Sticky "Read Me First!" and run a search on the Forum for more information on Water Traps.

[rickard_89]

The compression test showed that the pressure is 9.5 k/cm3. 135 PSI. What kind of problem you think I have right now?
We run the motor for around 2 or 3 minutes when this test was made.

[Cool77]

135 is not possible... You shall have around 90-100psi with a good engine.

A quick test as mentionned before, change your plug and gap it then post the result. Your symptoms look like fouled plug and/or low compression.