NOR-CAL General Chat.

[Bimmerman325i]

What's the point of doing three runs if you can't/aren't tuning anything? All three runs will be more or less the same (statistically speaking, they will be the same.) Sure, if you have carbs and the ability to adjust the timing, you might get somewhere, but with modern nonadjustable FI, the second two runs are redundant.

Will

Sort of. If everything is ideal, that is the case, but if something isn't or the car is experiencing temperature issues, the three runs won't be the same. Three gives you some help diagnosing any issues that may crop up that wouldn't normally.

Really though, that's just a side benefit. Real reason is that the labor to strap the car down and do one run is the same as for three, so might as well do three and make sure your car is running well and making consistent power.

Last time I got dynoed was in 105F temp with no humidity at altitude. First run was about 5 hp up compared to third run, back to back, even with fan blowing at the car, so there is some definite variability inherent just from atmospheric conditions.

[golde30]

NOS zender sideskirts for 100, someone pick these up: http://sfbay.craigslist.org/sby/ptd/3892682161.html

same ones as mine. cool.

[e30vert]

Definitely dont wanna lose my baby.. Looks like all my neighbors are getting a "friendly" notice from me later today

Careful! Thats how "all out" wars start.

Next thing you know they are in all your business (not just car related stuff).

Humans have this tendency to retaliate if they feel they have somehow been wronged. Clearly if it is one or more of your neighbors then they are tired of seeing your "project" and they just went about notifying you in the wrong way.

[e30vert]

I'm restoring them with new emblems and paint. Original paint

Original paint can be found on Eastwood as I recall. Here be a link for your viewing pleasure. :)

http://www.eastwood.com/vintage-racing-wheel-paint-gold-silver-11-oz.html

[cgk_iii]

Careful! Thats how "all out" wars start.

Next thing you know they are in all your business (not just car related stuff).

Humans have this tendency to retaliate if they feel they have somehow been wronged. Clearly if it is one or more of your neighbors then they are tired of seeing your "project" and they just went about notifying you in the wrong way.

yea its just upsetting because most of my neighbors are intrigued with what im doing.. one of them is actually doing all the machine work for me. it just sucks to know one of my neighbors is THAT nosey to really complain about something thats not in the way of their personal life. whatever tho. :wgaf:

:blowup:

[e30vert]

yea its just upsetting because most of my neighbors are intrigued with what im doing.. one of them is actually doing all the machine work for me. it just sucks to know one of my neighbors is THAT nosey to really complain about something thats not in the way of their personal life. whatever tho. :wgaf:

:blowup:

Intriguing some neighbors and including them means not including some others who can find it a nuisance. Sparking jealousy and the desire to make things tough.

It could have also been a cop that "happened" to drive by or a city enforcement official.

[BlackbirdM3]

Sort of. If everything is ideal, that is the case, but if something isn't or the car is experiencing temperature issues, the three runs won't be the same. Three gives you some help diagnosing any issues that may crop up that wouldn't normally.

Really though, that's just a side benefit. Real reason is that the labor to strap the car down and do one run is the same as for three, so might as well do three and make sure your car is running well and making consistent power.

Last time I got dynoed was in 105F temp with no humidity at altitude. First run was about 5 hp up compared to third run, back to back, even with fan blowing at the car, so there is some definite variability inherent just from atmospheric conditions.

5 Hp is still statistical noise. Yes, altitude and temp are big factors, but again, unless you can tune something on the 2nd and 3rd pulls. Still, it doesn't mean a thing when you go to a different dyno in a different place run by a different operator. Heck, you can find 5 hp by installing a clean air filter (the old one has to be really dirty though).

My point is, unless you are on the same dyno every time, the numbers that come up are really nothing more than a novelty. Heck, the last time I had my car on a dyno (different type from the last one I was on.) I had a reading that had the car down almost 20 hp, but then I did my homework and found out the type I was on typically 15-20 hp less than the type I set the car up on. (Dynojet vs a Mustang. The mustang reads low due to the amount of tension on the car, and can vary based on who and how the car was strapped down.) When I saw the low numbers I kinda freaked out and did a very careful test of everything, only to find everything was spot on. I tore my hair out, then went to the best Datsun tuning guy I know (Dave Rebello at Rebello Racing in Antioch) who asked if I tested on the same type of dyno, when I told him no, he said that was the issue and there was nothing wrong with the car.

My point is, mobile dynos are likely not accurate (because they get moved) and doing more than one pull is kinda pointless. Its better used to see if the a/f ratio is good throughout the RPM band rather than finding hp. This was my case since I don't have a WB O2 sensor in the car (I need one but there isn't room to mount one correctly.)

I'm not saying don't go. Go, have fun, but know that the #s you come up with are kinda meaningless.

Will

[BlackbirdM3]

Check pressure by blipping the valve under the black spin off cap on the small lines near the pass side fender. Dont breathe the released gas if possible. Is there any refrigerant released? If not, BOOM . Seals leaking and allowing refrigerant to vent to atmosphere. Against the law as it has to be reclaimed using special tanks , but if its a seal failure then how in the world could one be prosecuted ? So knowingly venting to atmosphere is against the law, but unknowlingy happens every day by cars with faulty seals.

There was pressure in both, it didn't seem like much however. I wish I knew someone who had a set of gauges. I could buy a set for about $50, but it seems like a one time need. (Hopefully). At this point, I'd rather not take everything apart, but it would be a good idea to replace all the seals. If the expansion valve is bad, I've got to pull the whole thing apart anyway. I guess the good news is that there is likely no corrosion in there.

Will

[cyberkaa]

5 Hp is still statistical noise. Yes, altitude and temp are big factors, but again, unless you can tune something on the 2nd and 3rd pulls. Still, it doesn't mean a thing when you go to a different dyno in a different place run by a different operator. Heck, you can find 5 hp by installing a clean air filter (the old one has to be really dirty though).

My point is, unless you are on the same dyno every time, the numbers that come up are really nothing more than a novelty. Heck, the last time I had my car on a dyno (different type from the last one I was on.) I had a reading that had the car down almost 20 hp, but then I did my homework and found out the type I was on typically 15-20 hp less than the type I set the car up on. (Dynojet vs a Mustang. The mustang reads low due to the amount of tension on the car, and can vary based on who and how the car was strapped down.) When I saw the low numbers I kinda freaked out and did a very careful test of everything, only to find everything was spot on. I tore my hair out, then went to the best Datsun tuning guy I know (Dave Rebello at Rebello Racing in Antioch) who asked if I tested on the same type of dyno, when I told him no, he said that was the issue and there was nothing wrong with the car.

My point is, mobile dynos are likely not accurate (because they get moved) and doing more than one pull is kinda pointless. Its better used to see if the a/f ratio is good throughout the RPM band rather than finding hp. This was my case since I don't have a WB O2 sensor in the car (I need one but there isn't room to mount one correctly.)

I'm not saying don't go. Go, have fun, but know that the #s you come up with are kinda meaningless.

Will

You made a good point about noise in the measurement, but your supporting anecdote is not completely relevant.

You can find a Mustang vs. Dynojet debate on just about every car forum. It's common knowledge that you can't directly compare the two (though maybe not common enough).

BMW tuners, including specE30 racers, compare Dynojet numbers because it's easier to get consistent readings between different Dynojet dynos. Also, many of the groups under NASA that require dyno results for classification are standardized on Dynojet with a specified correction factor and smoothing level.

[salvuhdor]

Original paint can be found on Eastwood as I recall. Here be a link for your viewing pleasure. :)

http://www.eastwood.com/vintage-racing-wheel-paint-gold-silver-11-oz.html

Sweet thanks!!!! Gonna check it out

[freeride53]

Phone interview for an internship in the AM. Then immediately setting off for Santa Cruz in the Peugeot :D Gawt my fingers cross for both.

[Bimmerman325i]

Will, I agree that dyno numbers are not ultimately the point, area under the curve as well as delta is. The nice thing about dynojets is that they are rather standardized and comparable if you aggregate enough dyno data, and are used by NASA as gospel for classing.

My reasoning for this though is to get a nasa certified dyno on the dyno used by the organizers to gauge hp for classing reasons. I dont care what the actual number is so much as gains and curve shape, and to check adequate AFR. For other folks it is definitely a novelty, or a tune check. Three pulls is better than one since it takes all of another minute to do.

There is tons of dynojet data for s50/2 cars with similar mods, so I have a good data range to compare to.

[Pantless Spency]

Leaving for Colorado in a wee bit.

[rob&e30]

I managed to cut and splice and sauder in a new connector and about 12 inches of wiring. It's been fine since yesterday took it to work. Car feels good. All the fuses are fine. My wiring was not clipped in before so it might have pinched. I talked to Igor from Catuned and he told e they get old and corrode after a while I guess it happens lol (early model bs)

[rob&e30]

PS e30vert I would like a new Mass air meter..... (it seems to work good but then again its been opened before so idk what they did ether rebuild or mod (prev owners lol)