My Dyno Results (Stockish Car)...

[Anquetil]

Hi Guys,

Finally got my car on a Dyno before some mods kick in, wasn't sure what to make of the A/F ratios on the readout?

This look normal for...

- Stock ECU.

- Full 3" exhaust, Hi-flow Cat.

- Apexi Air Filter.

- 8-9 PSI

- Hot humid day, about 30.

[Jay95R33]

Yepp,

That looks about right. Shame it's in 3rd gear, although I'm not sure if it'd make a difference anyway.

That dip in power is normal for a GTS-t with a bit of boost. The dip get's worse as you wind up the boost

The A/F ratio's are also typical for a stock ECU. Running pretty rich up top.

Mine pulled 160 with the same mods but with a stock air box and a FMIC, so yours look pretty good.

Cheers

J

[3R1K]

Nice, same mods as my 34,

I got 217.7 hp dunno what gear with 8.5 psi, with running much richer than that, maybe a/f problem

But that's pretty much you can get with all stock and 8-9 psi

[ix9]

i got 153rwkw on 9psi with a power dip like that....

but thats with stock dump, 2.5" cat..only mod is a front pipe so there's more restriction in mine...

after teh AFC tune I got 190rwkw, still stock dump/cat

200rwkw with de-cat and dump pipe should be about right

[benm]

Originally posted by Shane

- Stock ECU.

- Full 3" exhaust, Hi-flow Cat.

- Apexi Air Filter.

- 8-9 PSI

- Hot humid day, about 30.

Add a FMIC + Bosch 040 Fuel Pump + boost set to 12psi and you have my car... = 180rwkw

[MRK25T]

Originally posted by benm

Add a FMIC + Bosch 040 Fuel Pump + boost set to 12psi and you have my car... = 180rwkw

You may need to change the description you wrote about your car (just below your avtar). I'll let you know what mine is running tommorow evening - putting it on the dyno tommorow arvo

[N I B]

Was in 4th gear Erik.

[Anquetil]

Good to here its about average.

Dual boost controller is set up for about 10PSI at the moment but needs a bit more adjustment.

I'm attempting the FMIC install tomorrow, should open her up a bit! If all goes well I'll post some pics of the ghetto home job

Mark let us know how yours go's with the new Turb's?

[3R1K]

Oh yeah 4th gear,

means mine should produce more power than him rite?

or 3rd gear much better? I dun understand

[Boost King]

My 96 Gtst has similar mods, Pod filter, Intercooler (large), HKS EVC boost controller set to 0.75 bar or 10.5psi, 3" exhaust all the way, plus hi flow cat and pulled 190kw at rear wheels. I will post my chart up once I get the pic scanned as my scanner ain't working.

Anyone else pulling similar power figures.

My engine has done only 60,000km. It also made 203kw at 0.90 bar, but they advised me I had a more reliable long term package this way with less boost especially for the turbos sake.

Paul:burnout:

[Guest Robo's]

Yes looks pretty good, get your A/F ratios leaned out though through a SAFC and you should see some more easy kw's

[2BNVS]

i got mine dyno'd the other day, it pulled out 149rwkw with zorst, air filter and 10.5psi FMIC should be fitted soon so be interesting to see how it compares to others...

cheers...ben.

[sumfatchin]

got mine dynod just yesterday, 3inch exhaust, pod filter, and boost controller, pulled 163rwkw

[JimX]

Since power is simply a measuring of rate of work, it shouldn't matter to a great extent what gear the car is in. The engine still revs from 0 to redline whether you're in 3rd gear or reverse. There are some slight differences because engines respond differently according to load, but it shouldn't matter too much. As long as you do each dyno run in the same gear each time you will be able to get the tuning right.

The reason why Skylines (and similar Jap cars) usually get dyno'd in 3rd gear is because in 4th they can run into the 180kph speed limiter.

[Steve]

JimX, the gear will make a difference, as hp is a function of torque over revs, therefor you will have more torque at lower gears due to the advantage of a higher than 1:1 ratio at the gear box.

[JimX]

How much difference are we talking here though? If a car has say 200rwkw in 3rd gear, what would it have in 4th?

Edit: Hmm, maybe I'm not understanding this power thing then. I know that lower gears give you more torque, but you have less top speed. So in theory the power should work out to around the same in a taller gear, because you have less torque but more top speed. Someone educate me!

[Steve]

Well imagine if you had 300nm of torque at 150kmh, if you had the same 300nm at 200kph, power would be lower.

I am not sure exactly how much difference it makes, just does make some difference.

[skylineakt]

That's pretty good with 146 rwkw.

But just one question to all you guys here that has had their car dyno.

I have been reading some other threads on this forum and it has come to my attention that not all Dyno has the same reading.

Like your car might be 146 rwkw on this dyno but on someone else it might be more or less.

If this is so, how can we really compare our difference in kw output as we all would have dyno our cars on different machine?

See that is what I don't really get, isn't there like a standard for these dyno machine so that even if they are set different, on a special mode it would be relatively the same standard as the next machine. Or is that what the 'Shoot-out mode' is for?

It is just weird and don't really make much sense to me.

As I soon will want to dyno my car but whether how accurate it is, that is my question.

[JimX]

Originally posted by skylineakt

I have been reading some other threads on this forum and it has come to my attention that not all Dyno has the same reading.

Like your car might be 146 rwkw on this dyno but on someone else it might be more or less.

If this is so, how can we really compare our difference in kw output as we all would have dyno our cars on different machine?

We can't This has been discussed and argued about many many times before here and everywhere else dynos are discussed. The best you can get from them is a rough guide. Most of them seem to be roughly within 10% of each other, so it's pretty obvious that a car with 250rwkw is going to be a lot more powerful than a different car running 150rwkw on a different dyno.

Generally speaking of course, because you can callibrate the dyno to read whatever you like. But if the second car was "tweaked" to read 250rwkw, it would be pretty obvious that it wasn't legit just by going for a ride in the car. Or even looking at some of the mods.

Even a 1/4 mile time can't accurately judge how much power you've got, because there are considerations such as driver skill, suspension setup, tyres, and sometimes just luck (good or bad). But again, it can give you a pretty good idea. ie, a Skyline running 11 seconds definitely is not stock.

Comparing power outputs is just a pissing match anyway, so I'm kind of glad that you can't compare dyno readings directly.

[JimX]

Originally posted by Steve

Well imagine if you had 300nm of torque at 150kmh, if you had the same 300nm at 200kph, power would be lower.

I am not sure exactly how much difference it makes, just does make some difference.

I realise that, but say you were in redline at 3rd gear and doing say 100kph. At redline in 4th you would be putting less torque to the ground but the speed would be higher, which would indicate the same amount of work being done (just geared differently).

Down low the power readings will be lower in the taller gear but I would think that the peak power should be roughly the same no matter what gear you are in.