Acceleration movie from 30-200 km/h with new engine and 1.75

[Wolf66]

I finally found time to write new chip. Car goes wery well with it. Acceleration time from 100-200 km/h is 7.8 s. Here is some info of other cars fo comparison:








Movie: http://www.mobisux.com/album/data/500/4285230_200.avi


Graph from datalogger:






100 km/h: 12.78 s
200 km/h: 20.56 s

100-200 km/h: 7.78 s


Boost is now limited to 1.75 bar. Next step is 2.0 bar. 8)

[j1v]

Very impressive.
What have you done to turn it to 8k rpm ?
I'm very inpatient to see my runs like this. I'm afraid how ever to run it over 7k, even I have forged internals - still don't know about the reliability of the valvetrain.

And one more thing - isn't 12.5 AFR on 1.75boost and 8k rpms pretty risky? I would run a car like this no leaner that 12

[Wolf66]

I have gasflowed head and colombo&bariani street max cams and engine revs happily to 7800 RPM.

I found out that AFR of 12.5 produces highest power with 100 octane gasoline. Ignition advance is crucial factor, but i'm constantly logging engine parameters, including knock sensor and there is no detonation.

[j1v]

are those 7800 on stock valve springs ?

It is normal to have most power at 12.5-13, but is it safe enough ?
I would sacrifice a couple of ponys and go on the safe side. In my opinion knock sensor data is not that reliable, especially on a rebuilt engine with custom cams.

[Wolf66]

Yes, i have stock valve springs.

With my old engine, which had all stock internals except tipo inlet cam and oem inlet as exhaust cam i made 60 000 km with 1.5 bar boost at 7000 RPM and 12.5 AFR without any problems. I sold that engine and it runs still. You can see the video of acceleration with that engine in my other post.

I made 3000 km with new engine and i don't have any problems either.

People loose power with too rich mixture and incorrect ignition advance. If you have to much ignition advance, you have to add fuel to combat knock and higher temperatures that it produces. Richer mixture is burning slower so you acomplish the same thing as with leaner mixture and less ignition advance, but you loose power because mixture don't burn so well.

I'm logging aditional knock sensor not the oem one.

[j1v]

I agree on everything you've said, my thought was even one tank of bad fuel (not real 100 octane) on this kind of setup could make a lot of problems. But maybe in Slovenia you do not have those problems with gasoline we have ;-)

What kind of knock monitor are you using ?

[Wolf66]

You are right, if the quality of fuel varies a lot, it is better to stay on the safe side. As i said i didn't have any problems yet, but i'm always using the same fuel from the same company (OMV). We'll see, when i raise the boost to 2 bar.


I use additional knock sensor, which has external 5v power supply and it signals knock as variation of that supply voltage. It is not perfect, but it gives good indication if sustained knocking occur. Oem Q4 sensor is producing around 0.2 volts and more when knock occurs, but it is highly inaccurate because of voltage variation and because at high RPM this 0.2 volts are produced by valvetrain.

[T M Oren]

Do you have pictures of your engine?
During rebilding?

[djsly]

take a look here: http://www.berlinasportivo.com/phpBB...opic.php?t=180

[Juan AR155Q4]

Wolf, what an engine you have done!!!

Are you running your GT30? Hows lag and spool?

PS: Again, congratulations.

[T M Oren]

Are you uesing standard transmision?

[Wolf66]

Thank you.
I don't have GT30 yet. Currently i'm using Holset H1E which has a lot of lag.
I'm using standard transmission, apart from clutch and lightened flywheel.

[T M Oren]

Okey.
Were do you by parts?

[Wolf66]

Okey.
Were do you by parts?

Mostly in Italy.

[Brul(tm)]

Mostly in Italy.

on ebay, webshop or do you have any special contacts?
I think I must decide what to do with my engine soon. So a complete rebuild with different parts is a very good option.
Your setup sounds very interesting But I also see some challanges....

Greetings,
Marc

[Wolf66]

There are some shop near the Slovenian border which can deliver tuning parts. If you want to buy parts online, check www.protoxide.it. They are a little bit more expensive, but they have all you need.

[Brul(tm)]

I think I must decide what to do with my engine soon.

I am afraid the engine made the desision for me tonight
Not sure what has happend. Engine runs "normal" only the knocking sound from the head :shock:

Greetings,
Marc

[AlfaJack]

I think I must decide what to do with my engine soon.

I am afraid the engine made the desision for me tonight
Not sure what has happend. Engine runs "normal" only the knocking sound from the head :shock:

Greetings,
Marc

Oh dear, sorry to hear this Brul

[sub555]

sorry to hear that mate

[pitucas]

This post is ancient...

What has happened to your engine, Brul???

[Brul(tm)]

This post is ancient...

What has happened to your engine, Brul???

A bit late maybe, but the engine is fine . The problem was the clearance of the valves That was twice the number allowed So replacing some valve plates and everything was fine again

Greetings,
Marc

[AlfaJack]

Nice one Marc

Not seen you about for a bit Marc, welcome back

[Brul(tm)]

Not seen you about for a bit Marc, welcome back

Was busy busy busy

But the Q is not in a good condition at the moment
The turbo is gone, the turbine on the exhaust side is stuck in it's housing..... So i am waiting for a used turbo at the moment.

The stands like this in my garage....




The exhaust gasket is gone


The cause of all my problems


Made it till 283.926km Engine is fine, so after replacement the counting continues

I am sorry for the topic pollution

Greetings,
Marc