viper Posted August 27, 2013 Share Posted August 27, 2013 I have now begun to strip my current supra and will be building up Daywalker. Im currently running piggyback which has been a disaster and will be going standalone, syvecs seems to be the most recommended. I also want to up rate my injectors from the uk spec 550s to some nice big 1000cc+ ones. Your opinions would be greatly appreciated im running 269 cams, with an HKS t04r turbo let me know your thoughts Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 27, 2013 Share Posted August 27, 2013 Why on EARTH would you want to run 1000cc injectors? Quote Link to comment Share on other sites More sharing options...
viper Posted August 27, 2013 Author Share Posted August 27, 2013 to allow flexibility in turbo set up at a later date? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 27, 2013 Share Posted August 27, 2013 Just makes mapping for decent fuel consumption and idle much harder, I would run much smaller injectors and buy bigger should you really need them. Did you sort out the dead cylinder I posted advice about? Quote Link to comment Share on other sites More sharing options...
viper Posted August 27, 2013 Author Share Posted August 27, 2013 hi chris, thanks for the advice, in that case what size do you recommend for injectors? no never sorted it out, mechanically all is fine and with all the electrics being replaced i knocked it on the head. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 27, 2013 Share Posted August 27, 2013 What sort of honest and realistic power are you expecting? A rough guide to six cylinder turbo injector sizing is 1cc / min per injector for each BHP. So if you expected 500 BHP 550 or 600 cc/min injectors should more than suffice. 780 cc / min would easily support 700 BHP. This is on pump petrol at circa 43 PSI static rail pressure, so by just increasing rail pressure you get a good deal more headroom. Quote Link to comment Share on other sites More sharing options...
viper Posted August 27, 2013 Author Share Posted August 27, 2013 chris, thanks alot for the advice my turbo will be the restricting factor with power so 780-800cc would be ideal according to your calculations as for fuel rail pressure, im not sure as the fuel pump iv got is rated to 1300hp, i guess its going to be a bit of a learning curve across the project, once its all fitted ill get a fuel pressure guage on it and get a proper understanding of the rail pressures. Quote Link to comment Share on other sites More sharing options...
Wez Posted August 27, 2013 Share Posted August 27, 2013 Are you planning to use the flexifuel option and sensor on the Syvecs? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 27, 2013 Share Posted August 27, 2013 http://www.rceng.com/technical.aspx Use 80% duty cycle and a BSFC figure of 0.60 I find their suggested flow rates to be a bit on the high side, but you know they will be very adequate. Use a Bosch motorsport pressure regulator, they are as near 100% reliable as these things can be. A single Bosch 044 in the tank will be adequate, with hefty wiring. DO NOT use the stock connector atop the tank fitting. It won't handle the current. Quote Link to comment Share on other sites More sharing options...
viper Posted August 27, 2013 Author Share Posted August 27, 2013 if i go for a syvecs then i need to understand weather its worth it, i just intend on running stock fuel - - - Updated - - - im not going to be using a standard supra tank and pump, iv got a gallon fuel cell with a automotive external pump http://www.rceng.com/technical.aspx Use 80% duty cycle and a BSFC figure of 0.60 I find their suggested flow rates to be a bit on the high side, but you know they will be very adequate. Use a Bosch motorsport pressure regulator, they are as near 100% reliable as these things can be. A single Bosch 044 in the tank will be adequate, with hefty wiring. DO NOT use the stock connector atop the tank fitting. It won't handle the current. Quote Link to comment Share on other sites More sharing options...
viper Posted August 27, 2013 Author Share Posted August 27, 2013 intresting that calculator on the link, says 925cc injectors minimum so i guess 1000cc would be ok? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 27, 2013 Share Posted August 27, 2013 What sort of power are you expecting from that turbo and 269 cams then? You have to realise many of the figures from rolling roads bandied about are plainly ludicrous What sort of boost are you going to run? Pump fuel or race fuel? Quote Link to comment Share on other sites More sharing options...
viper Posted August 27, 2013 Author Share Posted August 27, 2013 it ran 600 at the crank on a hub dyno at 1.4 bar with 550cc injectors, i was hoping for 700hp, boost around 1.6, on road fuel Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 27, 2013 Share Posted August 27, 2013 intresting that calculator on the link, says 925cc injectors minimum so i guess 1000cc would be ok? I plugged in 50 PSI static rail pressure, which is the minimum I run on performance turbo engines. Good pumps and injectors will allow more still. But at 50 psi static even 2 bar boost is only about 80 PSI rail pressure. Bear in mind most of the huge injectors are redrilled smaller ones and don't have good patterns and are often disparate in flow rates, or at least that's my experience on the flow bench. Controlling huge injectors down to flow rates needed for idle and part throttle is a PITA as the opening times need to be tiny. Not all ECU's will manage it. Quote Link to comment Share on other sites More sharing options...
viper Posted August 27, 2013 Author Share Posted August 27, 2013 ah ok i got you, i was going to go for a syvecs s6, so keeping the fpr is a must by the sounds of things or even upgrading possibly Quote Link to comment Share on other sites More sharing options...
Slutters Posted August 27, 2013 Share Posted August 27, 2013 I would go for something simple, if your only racing the car there's no point having lots of maps etc. I have gone with HKS F Con V Pro 3.4 this is can do most of the stuff that the Syvecs can, and is also cheaper. You can also get it mapped by one of the best mappers in the country, if not the best. What power did it make at the hubs? Quote Link to comment Share on other sites More sharing options...
Slutters Posted August 27, 2013 Share Posted August 27, 2013 ah ok i got you, i was going to go for a syvecs s6, so keeping the fpr is a must by the sounds of things or even upgrading possibly You NEED a FPR as that is what sets and adjusts the rail pressure depending on boost/vac. Quote Link to comment Share on other sites More sharing options...
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