View Full Version : Mk Seat Ibiza 2.0l 16v Nos
swales_p
02-02-2004, 10:11
when looking at the new rolling road section on seatcupra.net i noticed Sean's seat ibiza 2.0l 16v with Nos. is nos bad for the car? ive always been put off by this and never really looked into it, now ive seen his car i want it!! how is it done? and what mods are needed for this? cheers :cheers:
Originally posted by swales_p
when looking at the new rolling road section on seatcupra.net i noticed Sean's seat ibiza 2.0l 16v with Nos. is nos bad for the car? ive always been put off by this and never really looked into it, now ive seen his car i want it!! how is it done? and what mods are needed for this? cheers :cheers:
As far as I'm aware, his engine blew up the day after that event!
Do you still want NOS?
My understanding of NOS....
IF NOS is properly installed and setup then its no more bad for your engine than getting the same power output from other means (eg. a turbo). In fact its quite the opposite.... increasing your power output by say 50bhp using a turbo will increase heat and potential for detonation, whereas a 50bhp increase using NOS will actually COOL the engine a LOT and help prevent detonation.
So, increasing power output using NOS is actually safer than the same power increase using other means (eg. turbo), but only IF (And its a big If) it been setup correctly.
Seans engine must of blown for one of two reasons... one the NOS install wasn't setup correctly (I've heard that MOST arn't!!!!) or the engine simply cannot handle that sort of power without extra strengthening in which case its not really the NOS' fault, the same result would of been seen using a turbo of the same power output!
Cheers
Ben
hopkinsgm
02-02-2004, 13:07
It has been noted on another thread that Sean's NOS installation was a fairly basic set-up. When the motor has been repaired he will be going for a progressive controller system.
My views on NOS? As with many mods, it can appear to be "power for peanuts" but a cheap installation will kill a motor quite quickly. To engineer a properly sorted solution will cost a few quid more...
www.noswizard.com not sure if Sean's kit is from here but I've heard of many runners on kit from here.
swales_p
02-02-2004, 16:47
does anybody know of a place that installs nos? also in reply to the post above. is my engine (2.0L 16v) strong enough to cope with say a 50 bhp increase from nos. cheers :cheers:
hopkinsgm
02-02-2004, 17:01
Originally posted by swales_p
...is my engine (2.0L 16v) strong enough to cope with say a 50 bhp increase from nos...
As you've no doubt read elsewhere (http://www.seatcupra.net/forums/showthread.php?s=&threadid=28756), Sean managed to hurt his 2.0 16v (ABF) the day after the RR day at Stealth, not a major blow up but enough to be a pain in the @rse. He was back on the road inside 3 days following a new head gasket, minor weld repair to the head and a skim.
He reckons that with a progressive controller the car will make good power and hopefully not blow any more head gaskets. Time will tell...
ibizacupra
02-02-2004, 17:21
James @ JBS Autos has done a pretty good NOS install on his Octavia.. (RR results @ Stealth confirm this.... -8'C induction temps on full boost.... well cool :D )
Progressive controller tho... Proper job...
Cheap NOS install will cost you in the long run...
sean martin
02-02-2004, 22:43
As already mentioned in this thread yes my head gasket went the day after the rolling road last week. The reason for the gasket going was not because the system failed or was badly installed but because I took the chance of getting a 50 hp kit without a controller. You can get away with this if you make sure that u only introduce the nitrous when at 3-4000 rpm or above and unluckily for me Vince's boys at stealth didn't seem to understand this and flicked the switch at 1500 rpm in 4th gear. This caused massive detonation hence the big bang and flame. So no more nitrous for me until I get a controller.
ibizacupra
03-02-2004, 07:26
Originally posted by sean martin
As already mentioned in this thread yes my head gasket went the day after the rolling road last week. The reason for the gasket going was not because the system failed or was badly installed but because I took the chance of getting a 50 hp kit without a controller. You can get away with this if you make sure that u only introduce the nitrous when at 3-4000 rpm or above and unluckily for me Vince's boys at stealth didn't seem to understand this and flicked the switch at 1500 rpm in 4th gear. This caused massive detonation hence the big bang and flame. So no more nitrous for me until I get a controller.
did you tell em @ Stealth how to run it Sean?
the plot certainly shows the 2nd run and when they floored it >4K rpm... instant power. Must feel nice when that kicks in.
Instant power (ie no progression) is'nt going to be friendly to engine or transmission.
For the turbo's its instant massive cooling effect is superb...
*wonders* NOS IHI'd car :) :p :D
max_torque
03-02-2004, 07:41
The problem with an uncontrolled kit is that it dumps in a fixed amount of gas / fuel at all engine speeds when switched on. hence at high speed each cylinder filling event only will take a small proportion of NOS compared to a cylinder filling event at low speed, hence it is a fixed power kit, not a fixed torque kit.
if you do the sums, a nominal 50bhp at 6000rpm only requires a torque increase of 60Nm to provide it, on top of the std engines output of approximately 180Nm this is within the mechanical strength of the engine. However to make the same 50bhp at 1500rpm will result in a torque increase of 240Nm!!! (this is not with the limits, hence headgasket failure etc!)
A programable controller will add progressively more gas as rpm increases, giving a fixed TORQUE increase, which is safe for engine durability, and much nicer to drive as the additional power increases with rpm, matching the std engines power curve shape. Whereas the switched system gives an almightly wallop at low to mid range, then tails off at the top end
My old 2.0 16V also has NOS installed. The current owner done more than 15k miles since then (not using NOS all the time of course). He also has got a computer controlled/lambda monitored system. It still works and engine is OK. We did plenty of races, it is just as good as my chipped 20VT (only for 30 secs though, NOS computer cuts in :p )
http://www.seatcupra.net/forums/showthread.php?threadid=19702