Its here!!!!

[turbotalon1g]

wish i could be there for the inaugural run. That thing looks bad ass!! One day my dsm will be able to turn a roller or two.
skeet! skeet!! skeet!!!
(Congrats again)

[Shrep]

Actually, inertia dyno's "load" decreases as the drum speed increases. ;)

In the real world, a 30psi Honda does not stay at 7000RPMs for 30 seconds
Well...I think that depends on what the car is being used for.

I've seen plenty of high hp hondas who's owners will accept a 5 gear race, or a top end run, or sit and burn the rubber off the tires for fun...

If the tune (including cooling) is correct, this should not be a problem.

[TheBlizzard]

Actually, inertia dyno's "load" decreases as the drum speed increases. ;)


Well...I think that depends on what the car is being used for.
If the tune (including cooling) is correct, this should not be a problem.
I think it has more to do with what mods are on the car in question. If you have to small of an FMIC and or a turbo that is out of its efficiency your going to heat soak no matter how you "tune" it. And the longer you stay in it the worse its going to get.

Now if you were not pushing the car to the limits then I could see it being ran at a given RPM and boost for a extended period of time.

But when you start getting into the 30+ psi range on most cars, if you ran them constantly at that boost and 7k RPM something would break no matter how good your tune is. You would have to have knock retard setup pretty aggresively so that when the car heat soaks, it will pull shit loads of timing or something.

[niterydr]

I think it has more to do with what mods are on the car in question. If you have to small of an FMIC and or a turbo that is out of its efficiency your going to heat soak no matter how you "tune" it. And the longer you stay in it the worse its going to get.

Now if you were not pushing the car to the limits then I could see it being ran at a given RPM and boost for a extended period of time.

But when you start getting into the 30+ psi range on most cars, if you ran them constantly at that boost and 7k RPM something would break no matter how good your tune is. You would have to have knock retard setup pretty aggresively so that when the car heat soaks, it will pull shit loads of timing or something.
Very good points. I think Shrep's point is that for 99.5% of the tuning you can do load based. You can load the car at say, 4000rpm, and watch the a/f swing as you give it: No load, Light Load, Medium Load, and Max load. This will simulate nearly all the conditions (it is very hard to get accel and decel tuning in on the dyno, that is still best left to the street at normal speeds). If you are tuning say 8000rpm at 30psi on...well my car, I'll go bump the site real quick, almost as fast as I would on an intertia pull. I'll hold it there for a few seconds more than the dyno would just using ramp speed. This will allow me to grab a few snapshots with all my logging software to make sure that the tune is fine. If I can't make my adjustments fast enough in real time, I will back down the car, make my changes, and go revisit the site.
When you get fast with steady state tuning, you can rip through the cells in no-time (pending what system you have, what the car is, etc). I know when we were out at XX tuning, at the end of the sessions we could just fly through the Autronic software.
It is a very risky business, and you have to have a good head on your shoulders when you are dyno tuning. Common sence still needs to be practiced, but you also have to faith in your tools.

[Shrep]

I think it has more to do with what mods are on the car in question. If you have to small of an FMIC and or a turbo that is out of its efficiency your going to heat soak no matter how you "tune" it. And the longer you stay in it the worse its going to get.I guess that's kind of what I was trying to say. If it's built right, there shouldn't be a problem

As far as the specific example (the honda), you and Shane are right, it's gonna blow. But that's obviously a setup that doesn't need steady state tuning...cause if it's that close to the brink, it's either a drag only car, or a dyno queen.

So I guess when Shane said "It's not like you are going to be doing steady state loaded tuning at 8500RPMs at on a Honda running 30psi either", we probably could have just said..."you're right", but it's the insinuation that we don't know what we're talking about that I was more intentioned on addressing.

It seems like Shane was trying to make us look dumb for buying a dyno that we'll never grow out of, and in the process implying that we don't know what we're doing.

The fact is, there are some high hp fwd cars out there that are daily drivers, road racers and autocrossers. All three types are best tuned for more than WOT.

[JET]

If the tune (including cooling) is correct, this should not be a problem.Yeah, because you will have plenty of air going through the radiator and IC, just like you would on the street. When is the wind tunnel being constructed? :eek:

[Jakey]

Yeah, because you will have plenty of air going through the radiator and IC, just like you would on the street. When is the wind tunnel being constructed? :eek:


Barn fan.

[Shrep]

Yeah, because you will have plenty of air going through the radiator and IC, just like you would on the street. When is the wind tunnel being constructed? :eek:
It's being drop shipped. ;)

[TheBlizzard]

I don't think anyone was trying to make anyone look dumb. Just asking a simple question. The extra retarder on the front axle is cool and all. It will let you put cars on the dyno the same direction and not have to move things around. And you could dyno a 2700whp AWD. But is that really worth an extra 10k. Hey its your money, it was just a question. And as far as load tuning goes the way Swanny explained it makes more sense. Using the dyno in that fashion makes perfect sense but holding your car at 30PSI at 8000k for 30 seconds is going have ill effects no matter how you stack it. Unless you are spraying your IC with NOS the whole time to keep your AITs way down.

But loading it down for a few more second on the top of the pull would have benefits I could see since your sample would be a little more accurate and easier to diagnose problems if there is any.

[Tauni]

Congrats boys!