Rippers

Sorry if these are silly questions but how does nitrous effect the con rods of the engine ie people say if you want nitrous you need to uprate the rods, is this purely because of the extra strain the burst of power causes or is it for another reason.
At what levels of power and amounts of nos do these become problems.. example engine Focus RS at about 270bhp??

Thanks Paul

Chip

iTrader: (3)

Most conrods fail on the start of the exhaust stroke as they stretch, so its revs that kill them not torque generally.

BUT if you have a weak rod that cant handle torque then it will fail with nitrous torque just the same as it would from any other type of torque, ie more boost or other VE improvements.

sbd16v

its because of the ablility to run a very large amount more power lower in the rev range and that means alot more Tq generated

Richie.

iTrader: (5)

You're not worried about the Ka are you

Rippers

Ok, so basically it all depends on the power/torque level.

How effective would say a 25/50 shot of nos be on a 270 FRS engine? (roughly)

Rippers

It would be for a FWD quatermile time so would want to use the nos in end of third gear all of fouth gear??

Rippers

maybe

pani_k

iTrader: (1)

Nitrous needn't be a huge burst like an on/off switch though. You can graduate it in using electronic control.

Benni

Progressive?

Benni.

Richie.

iTrader: (5)

Grudge match

It'll be fair, two completely different cars

Ones a fast little red car, the others your Fiesta

Chip

iTrader: (3)

25 bhp you will bearly notice, 50bhp will make a nice difference, id be using it progressively right off the line though to allow you to hook up at lower rpm

Stavros

Uprated conrods for nitrous is usually reccomended by the same folk who reccomend an uprated head gasket for more boost.

Ie the people whos cars are detting like fuck, blowing head gaskets and bending rods.

Benni

In something like a Ford Focus 100bhp you would notice it though, wouldn't you?

Benni.

Chip

iTrader: (3)

Agreed!

Chip

iTrader: (3)

Yes definately, but its an expensive way to still be in a slow 125bhp car!

Benni

I would never consider it, I was just curious.

Benni.

Rippers

Are these a stand alone set up ie would the car have to me mapped around the nos?

DangerousBryan

stand alone so no need to touch the cars map at all.
have a look here

http://www.noswizard.com/index.php?c...660d8519f80147

bryan

sbd16v

no using a wet system so the fuel and nitrous is supplied by the kit

Chip

iTrader: (3)

It depends on the power level you are adding.

On my YB I have to take a little timing out when on the gas, but I do that via the octane wires so the map hasnt been touched, not sure what the options are in that respect on the focus lump though.

Just a case of det checking and seeing, on SBD16V's motor we were running 125bhp of nitrous with no timing taken out at all, and it didnt have any issues, but its not always the case.

RWD_cossie_wil

iTrader: (9)

To be honest, I don't really see the point in Nitrous until you are at the engines realistic tuning limit for sensible outlay, with the FRS you would be better off just going up to the next stage of tune IMHO....

N/a is a different matter as power is so expensive per BHP then it makes sense.

Rippers

I think its trying to get a level of power to grip ratio right on the FWD. I have no idea why my old Fiesta used to perform so well @ 270bhp when all my competitors with similar set ups but much more power where doing much higher terminals but poorer times. Maybe my power range was better then the bigger turbo'd cars, my Fiesta certianly had no lag issues.
So if I got the next power stage it would be a T34 which may shift the power range up too high. Where as the nos would just be extra power on top of what I have. I always felt that the 1st 2nd and 3rd where ok on the quarter but 4th gear could have done with a bit more to pull across the terminal a bit faster.

It all down to experimenting at the end of the day

sbd16v

drivability

Chip

iTrader: (3)

That depends, I bet you would change your mind if you drove my YB with a T34 and 125bhp jets in it.

SO much better to drive than a T4 one, its not even comparable!

(much more expensive if you use it a lot on the gas though!)

RWD_cossie_wil

iTrader: (9)

Thats my problem with it really , i'm sure it fantastic fun, but whats a 22lbs refill, about Ł50?. IMHO it's GT30 time for that sort of dosh. Can you not steal it from a hospital?

Rippers

For the quarter mile its not over expensive

pa_sjo

I think you'd need progressive control for any reasonable amount of nitrous on fwd though.. Having a 200+ ft-lb torque spike at 2000rpm ain't gonna do you much good for traction.

Chip

iTrader: (3)

Standard price is 6 quid a lb, and 11lb bottle lasts about two minutes of full throttle on my car.

Thats 50p a second


SO much better than any GT30 is though to actually drive!


Nova is having GT35R + nitrous, so best of both worlds.

RWD_cossie_wil

iTrader: (9)

Ł6 a Lb

pa_sjo

You can get it for half that chip if you buy a big bottle

Chip

iTrader: (3)

Indeed, I do exactly that mate.

I was just saying thats the normal retial price.

Bottle is dear if you dont use a lot though, cause of delivery cost and rental etc, so still expensive.

percybigun

surely for the cost of a NOS kit on a focus RS, you could buy engine mods that would give you a permanent 25-50bhp power hike?

and remember NOS is useless when the bottle is cold (i.e. most of the year round) and even with bottle heaters it takes quite a while to warm them up. and i cant be arsed lugging the bottle in and out of the car to keep it warm in the house etc. so it tends to never hardly get used.

Chip

iTrader: (3)

Utter nonsense, it works fine cold, just needs jetting accordingly.

SO much bullshit out there about nitrous!

percybigun

not on mine it doesnt, jet size and AFR was checked on a rolling road while the bottle was warm.

say what you want chip, when mine is cold hardly anything happens. proof is in the pudding

Chip

iTrader: (3)

You fucking retard

can you not see the problem with what you just said?

percybigun

whats the point of having to get it check on a rolling road every time the weather temp changes?

why the hostility and cuntish posts?

Chip

iTrader: (3)

I wasnt hostile, was just laughing at you not being agrressive.

Did you map your car at 20psi and then copy the values to the cells for 10psi?
If not why not?

Jim Galbally

if youre interested in short bursts of speed (ie 1/4m) then nitrous is the most cost effective and sensible tuning option i can think of!

want a fast road car or track car tho and it makes less sense.

how many other modifications can you bolt on in an hour, cost 500quid and give you a 50-100% power increase on pretty much any car out there?

Jim Galbally

what do you mean youre checking the AFR ona roalling road?

that's the Air/Fuel ratio, right?

the air isn't made up of 50+% nitrous oxide

percybigun

i meant checked it wasnt over/under fuelling when nitrous is in use?

i.e. isnt that what your supposed to get checked