edde said:
Its usually activatd when you put the throttle to the floor and ahve the system switched on and the controllers inject the extra fuel and NOS progressivly.
Its a relitivly safe power mod but to do it right you need to often uprate the fuel pump and have it set up correctly plus its expensive if you use it a lot.
Still an extra 50hp etc is much easier to get and cheaper than tunning to get an extra 50hp.
If it goes wrong though and your using bit jets as Matt Black proved you'll go through engine quickly he went though a V6 CLio engine meting some pictons as the pump couldn't supply enough fuel and his 172 engined Clio went though 3 engines in total I think before he gave up with the 172 and stuck the TT in.
depends on the engine too.. the 172 engines arent the best for tuning are they..
mine and matts systems were both wizards of nos systems with minimax digital controllers, these have start percent, finish percent, and build up time settings. the maximiser does have a rev setting now i believe so it cant coem in till certain RPM
the higher the RPM the more power it can take so always best to have a progressive system to build it up either over time or revs
i used to arm mine but only put the throttle 3/4 the way till it got to about 4krpm then id put foot to the floor for the N2O to kick in. seemed to work well down the drag strip and it gave me reliable trouble free motoring with plenty of power.
i also had a wide range of jet sizes. theres alot of people out there who will set their car up in the winter, yeah alls good. but then when summer comes leaving the jettign the same - the bottle heats up and the pressure increases alot causing more n2o to get in there and subsequently the car running lean and bang.
bottle warmers are perfect for this, keeping it at the 900ish psi opimum pressure ensuring the jetting should be the same
edde - with regards the fuel pump issues.. thats why your supposed to do static tests with the pipe open ended pointing into a bottle to check the flow coming out is enough. when i set mine up i set it rich so it spluttered at higher rpm, then using the various jets i had began to lean the mixture until the spluttering stopped. some people just take a 'typical' jet setup install it and assume its ok but it could be running slightly lean and then eventually it will go bang.
i think theres far too many clueless people out there fitting it and not understanding it. not setting it up right, and not using it correctly and obviously its going to lead to failure.
as for the cases when it is under stress - the dicks on the rolling road kicked mine in at like 1500rpmish and i honestly thought it would have gone bang but it was fine.. lol i think the TU 8v's are very strong engines.
another suprise, i was running standard 1.1 106 driveshafts and they took the 180bhp - even when i had big heavy 17inch wheels on.. again another point i thought would fail.