Quote:
Originally Posted by Spenny_b
Some years ago it was met with a healthy dose of scepticism that I had chosen a 1050cc injector. Not doubting that there are tuners like Scott Winders getting the results they're after, and I'm certainly not going to enter into a "debate" over it. There's an infinite amount of variables with these projects, different combinations of parts that WILL change how engine behaves, we all know this. These guys between them look after some immensely impressive and highly tuned toys for some very demanding customers…think 918's (not a typo), CGT's, F40 Evo's, all flavours of very pedigreed RSR's, ex Le Mans 993 GT Evos, 'Ring record holding 911's, etc... so I'm not about to second guess their experience and knowledge. They're the ones in the driving seat and calibrating this thing; if they felt that swapping the injectors would yield better results then I’m going along with it.
What I will also say is that we're now at the top-end of the operating spectrum of the new Bosch injector, and on WOT we're probably beyond the comfortable duty cycle. You only find this by spending time (and money) on the dyno. Not a problem for us with a road car. Any more than a few seconds of using WOT and it gets silly on the UK roads. Very seriously, jail sentences are a serious consideration if you want to use more than a few seconds of WOT. If this was a track car, or pulling a 30 seconds at time of WOT down the Mulsanne, then we'd need to go for a half-way house option and reduce that duty cycle. But the Syvecs is far more tolerant (better injector drivers) than a lot of ECU's (e.g my previous MBE system which would've popped the drivers very easily). Finding out how these current injectors performed was all done 3 days before Xmas; literally no more time to start experimenting with injectors at this point, that's for another day. My personal thoughts are that a 750cc injector would be the Goldilocks option. Maybe with a future exhaust system change I’ll add a set of slightly larger injectors and see what happens.
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By all means use what ever injectors work in your application. I would certainly not debate the choice you made. Oh, I am not a tuner. Just a guy with a race engine that was looking to get the best performance possible.
I am just surprised that the ID 1050x injectors did not work well for you. My application has only 369 HP at the wheels and I get great drivability and throttle response from the engine with them. I am using a MoTec M130 ECU and it has tables for the injectors which describe the flow characteristics at various voltages and fuel pressures. What's really cool is I could change to another injector and, as long I as MoTec has tables for those injectors, I wouldn't even have to retune. I could even change fuel pressure and not have to retune. At least in theory. All cool stuff, but, if they don't work for you, that doesn't matter!