Stavros

We know it does, but i've never seen a before and after comparison graph.

But heres one, so might be of interest...

"80bhp" jet, 3litre engine and GT42 turbo. (in think). Properly wakes it up though!

RichieST

iTrader: (2)

Thank fuck for that. I can sleep at night now

Lloyd

yeah good isnt it,

Stavros

What size jet do you use Lloyd? What sort of difference (in rpm/time) do you see with yours?

Lloyd

i use a 50 shot, probably = more like 70 in a turbo engine.
i wouldnt launch at 8k without the nos,literally had to bounce it off the limiter,with nos,about 6k ,reving to 7k and it just flys away.

mk3cosworth

im putting a 50 shot on the mk3 for that little extra help

pee vee

it is quite impressive though!

So, would the bigger gets ie 100 or bigger, make the turbo spool up even quicker?
or would even more gas make little difference to the spool time?

Stavros

More you use, the quicker it would be. But a massive sudden hit may not be so controlable, and sure would cost you more in gas.

Ive seen cars that take 30secs to spool up using transbrakes and stuff without nitrous spool up in under 5sec using gas.

JjCoDeX75

So what causes the power line to be "wiggly" Stav?

JJ

rapidcossie

Its been drawn on by a NOS company

Stavros

Dodgy grip on the dyno id expect.

I saw a graph from a 200SX at ATP the other day where the lines did a fucking Loop The Loop, I shit you not! Ill find em.

Euan- Its nothing to do with anyone who sells Nitrous.

Here we go with the loop

JjCoDeX75

- you silly arse!!!!

JJ

St3V3_C

Guy that drew it had a shakey hand.


HTH









Is a bit odd as it's a product of torque, that looks nice and smooth?

rapidcossie

I was joking!

It actually look really impressive!

JjCoDeX75

Dig em out - would be good to see.

I have seen slip on a dyno before, but nothing like that! Mind you - never seen that much power on a dyno up close.

Stunning how it affects the spool up - graphs make the car look like it would be a good deal more driveable (to the layman at least!)

JJ

Stavros

Added the comedy loop the loop pic above!

Never seen that before either, dynos do funny things when there is traction probs.

Wiggly lines are common, a lot more realistic than the etch a sketch straight lines we keep seeing on PF, but a loop the loop is a new one on me!

JjCoDeX75

Agreed! I guess the RR operator must have lifted his foot as the car tried to leave the Rollers and enter orbit!!!

JJ

St3V3_C

That is bizzare!

foreigneRS

the torque curve has the ripples in it too - i guess it's from inconsistent pressure in the NOS system

Alg1k

iTrader: (2)

.

Rod-Tarry

Surely Nos is cheating so why are the moderators allowing this to be aired, its unfair showing people the benefits of Nitrous when you are not allowed to use it according to leading lights on here.

Chip

iTrader: (3)

The wiggle is caused potentially by the increase in exhaust gas on the nitrous meaning the wastegate is working harder to try and control boost as it cant react quick enough would be my guess.

Thats obviously not the point of the discussion though, its about the spool up, and that does EXACTLY what I always experience on the gas.

Keep telling people that about my car, I get better response to the throttle and quicker boost build on T34/nitrous than you will on a small turbo escos.

If you use a massive turbo, and a shot of gas that cuts out at a bar of boost, it lasts for ages too, as it is only on for a second or two to spool it, then once its spooled even though the nitrous cuts off again, the turbo stays spooled at revs that it could never spool at normally.

Properly good shit, I cant work out why anyone would want to NOT have nitrous on the car, so at least they have the option of going quick if they want, its not like you have to use it, just gives you the option.

Nash

iTrader: (3)

Whys the power now droping off about 500rpm sooner than the run without NOS? Or is this down to the operator just lifting earlier as peak power has been reached.

Chip

iTrader: (3)

Yes, just thats him just lifting off I would imagine.

Christian and Beccy

iTrader: (14)

That wiggly line has nothing to do with Nitrous or anything we did wrong, it's down to the fact that the car is running that power on a normal Paddle clutch, where the owner knows he needs a Twin-plate (and had one until he fucked it up).

I wouldn't mind betting that the NOS graph at the top is the same, it needs a better clutch or something like that.

foreigneRS

even though it's not the point of the discussion, it's still interesting to discuss.

i think that if it were the wastegate, the boost curve would have the same shape, and it doesn't

do we know what was being used to control the wastegate?

Stavros

Here is a quote regardign the graph above, it was a 3litre and GT42, but there was more to it, read below...

Christian and Beccy

iTrader: (14)

Aaaah, so it was an Auto?

Chip

iTrader: (3)

Boost curve looks like it wiggles in the same place to me, but based on what stav has just said, it looks more likely its the transmission.

But as you said, its not the point of this discussion, its only a little quirk of the setup used for whatever reason.