Article 240Z dans sport auto

[tchorgnasse]

Tu rigole ? Mais on les lachents pas les journalists, t'inquête pas !

Faut pas lacher la pression !!

[Lazeum]

Très bien le message!!!

[Sean]

ça fait vingt ans - pourquoi arreter maintenant que j'ai le réputation comme tête de con ?

[grapatax]

ah bon?!!!!!!!!

[Invité]

ça fait vingt ans - pourquoi arreter maintenant que j'ai le réputation comme tête de con ?

Tête de con... hum..hum...voyons un peu.....,,,,,, nnnnnoooooooonnnnnnnnnn ! pas du tout..., Anglais oui! hihihihihihihihihihihihihihihihihihihihihihihihhih ihihihihihihii !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!


Mafia of south!!!!!!!!!!!!!!!!!!!!!!!!!! DATSUNREVOLUTIONINDEPENDENTZIA !!!!!!!!!!!

[Sean]

ça fait vingt ans - pourquoi arreter maintenant que j'ai le réputation comme tête de con ?

Bah, tête de l'âne alors........ ?

[nissag250]

Si tu penses à autre chose que la culasse qui va pas avec les pistons et la came pas assez pointue, je t'écoute

ça y est j'ai retrouvé le texte, qu'en penses tu ?

Some things came to light from this session, particularly regarding heat. Not surprising is the location of the air filter, next to the radiator. It was a warm day to begin with, around 85 degrees. I was recording 160 deg. intake temps. Ouch. My best guess is that this cost us close to 7 or 8 hp. If I'm right, we would have seen ~180whp. Not bad, but still about 15 or 20hp less than I was betting on. The owner was a contributing factor in the location of the air filter. After seeing the results empirically.... lets just say, before day's end, a resolution was in the works.

The one that did surprised me a little was water temps, compression ratio, and detonation. First, the compression ratio of this engine is modest, at about 8.1 to 8.2. Never expected any detonation. Running a 160 deg. thermostat, we never got any when the water temps were 'normal'. However, even with premium fuel and low compression, we experienced SEVERE detonation once the water temps reached about 225 deg. Obviously, dialing back the timing, based on temp, 'solves' the problem, but that's not really the point. Backing into it.... we got the best numbers at 160 deg. Every consecutive run, brought temps up... and power down. Let the car cool down and the power reappeared. When we pushed much beyond 210 deg., we would get detonation, progressively worse with temp.

At 160 degrees, the car made the same power with total timing anywhere between 37 and 43 degrees. Running less than 37 cost power. With temps above 200, 40 degrees caused a power reduction.

This, in itself, is not all that surprising... the surprise is the knock propensity at such modest comp. ratios. How about all those L6's, running 10+ CR, with lackluster cooling systems? My point is this... don't discount a cool T-stat and a cooling system to back it up.... the car is receiving a Ron Davis radiator and an upgraded fan.

The other related conclusion is that this is inspiring me to install a cylinder head temp sensor near cylinder 5, as this appears to be directly related to chamber temperature. Wolf will allow additional sensors to manipulate the mapping... I will be taking advantage of that, even if for no other purpose than data logging... I think it will be interesting to see the correlation between cyl. head and water temp sensors.

In the end, this car is proof that a dyno sheet doesn't tell the whole story.

[Lazeum]

C'est intéressant, en effet
A vérifier donc.. Cependant mon radiateur est complétement revu, le thermostat est neuf, et la jauge de T° ne monte jamais au delà de la moitié.

[Sean]

C'est un carteur d'huile plus grand, un radiateur, une grande radiateur d'eau en alu avec deux ventilateurs électric, une thermostat 83° et l'huile 10/60.

Si vous regardez dans mes videos, aux pistes ou avant sur les pre-grilles ou après la dernière tour, le temp. reste normale - c'est hyper important qui l'huile est propre et garde ses qualités pendant il chauffe ET que le system de refroidissement se function nickel - les deux lois pour un L gata moteur en bonne santé, n'importe le niveau de 'tune' !!!

[Lazeum]

On dévie sur un sujet intéressant qui mérite de ne pas être perdu dans des discours sur Sport auto.
Un petit sujet technique de plus à créer Sean???