I will take you up on your quote "1cc = 1rwhp on 98RON" and I'll add 30% for E85 compensation, which will make 1.3cc = 1rwhp on E85. Would I be wrong to claim that ? Now if your quote is real we should see that 402RWHP is possible with 555cc Calculation: 402rwhp X 1.3cc = 522cc on E85. That claim should even reduce the figures on my calculation! "260-270rwkw at STOCK fuel pressure and STOCK injectors" is maybe possible on 100% duty cycle but it would be lean as (or I'm using different manufacturers flow calculator that is offsetting my calculation by the notch). However those injectors on stock fuel pressure are running 100% duty cycle for sure! Everything can be calculated beforehand. And I can even calculate your losses on 1000cc vs properly sized injectors but I'm to lazy for that My only point here is that big injectors are gonna run rich on low revs no matter what you do, or how good you tune is. If you to advise 1000cc injectors on my 800HP engine I would consider that as for E85. But can't you see what power levers we are talking about here? I wouldn't advise people with stock standard engines to run 1000cc injectors, and running stock turbos at 20PSI when we know that they are only efficient up too 15PSI. Specially if that will be them daily ride... Which won't last long in those conditions....
Until you've actually done it your calculations are simply hypotheticals. There are plenty of cars actually driving around, Z32 and other platforms, that are achieving these results. It's good to think about things and calculate and estimate, but we know what's possible because it's been done with consistent and repeated success.
Andy, if you havent fixed your dud throwout bearing first do that. Afterwards I'd use the cash on a Nistune with flex capabilities to see what we can get out of your current setup and then have the backbone to upgrade injectors down the track for more power. I have access to one of the countries best tuners here in Brisbane (and he owes me a favour or two) who has just done the E30 and will be doing both Z32's when they are back together and he can sort the tune for you.
I have to ask: Until I done what? Do the mods that I'm argue against? I set my target first, did my mechanical calculations, figured out if my goals are achievable, did the cost calculations, prepared the part list, and then I went and done the actual work. My power levels goals were very much like yours but I had something else in my mind, and I bet you gonna like my idea I want no lag!!! With same turbines as yours... So in order to achieve my goal I need to do extra step which you will find all about when I roll my project out
Good excuse to upgrade then I was moreso aiming to tweak what he already has and have the capability to run ethanol in future. Do any of the upgrade s1 injectors (555's etc) suffer the same fate?
Minimum for ethanol go nismo 740 -about $1k for injectors and $185USD (including delivery) for fittings. I wouldn't recommend it on a manual though as you'll find the limit of the injectors pretty quick.
All series 1 type will have the same issue, as the problem is in aluminium pintle that they used in design. To go type 2 on stock fuel rail you will need adapter kit. Something like below link: http://www.ebay.com.au/itm/Fit-Niss...205935?hash=item2ee84314af:g:d8AAAOSwVFlUJ3ys Series 2 are pintless design, won't have issues with ethanol, and in general is better injector. (Fuel atomisation improved). If you thinking to upgrade type 2 is your best choice, unless you gonna go all the way and spend money on top feed rails. You will need nistune bord and re-tune when upgrading injectors.
Highly underrated injectors.... The Twin Spray (excellent atomisation) Sards are a highly efficient, good alternative injector for the zeds
Here's something you may have missed, My car, factory turbos, 20PSI, 71% Ethanol content as displayed by the sensor, 70% Injector duty cycle on 1000CC injectors. So your 2871's would max out 1000's quick smart. Few other cars from the states run 740cc injectors, hitting 90% IDC. Z32 TT(Mark) on here ran 850s and was in the 80% range for IDC.
This is on pump fuel at 18psi (mid range) on stock turbos and stock injectors and stock pressure. I don't know what the IDC is but you can see the AFR is where you would want it. After this dyno run I have since had the fuel pressure increased. I have been running +18 since July 2013 on stock turbos and stock injectors and haven't had any issues yet even though my Z has been my daily all that time (and sees full boost daily). Also the stock turbo compressor map shows it is still reasonably efficient (in the mid range) past 15psi. Here is the stock compressor map. I have been running +20 (after fuel pressure increase) on stock turbos and stock injectors daily since over a year ago with no issues. Competed at the Snowy Mountains 1000 at +20psi boost and had no problems.
Good to know. i'm currently building two z32's, one with a s1 engine setup and the second with a s2 setup (complete engine, loom, etc). The S1 will be a moderate power setup on pump fuel with a set of 550's and Nistune on stock turbos, S2 will be full tilt on flex with an undecided ecu, HKS2540's and whatever injectors are needed to support 500rwhp. That injector adapter kit looks like a cool bit of kit. Will look into that if needed.
On 98? On a RWD chassis dyno? I'll have to see that to believe it.... look forward to being proved wrong
For 500RWHP On stock FPR you can choose from below: 80% DC Fuel Type cc/min Gasonline 733.89 E85 954.06 85% DC Fuel Type cc/min Gasonline 690.72 E85 897.94 90% DC Fuel Type cc/min Gasonline 652.35 E85 848.05
