Rob you have to remember all those online calculators are going to be conservative, they are meant as a guide only, a starting point. I agree though Ian has got to be pushing the limits of the 740's at those power levels lol. But remember again peak duty cycle is generally going to be up around redline, and you can see in the graph that it does lean out a little over 6000rpm, but still .8 lambda is fine. And again this dyno in Tas might be more generous with it's numbers than the dyno's used in NSW. The only truly accurate indicator of performance is on track acceleration. Also the graph says E85.
For sure -I use the raceworks one mostly which you can adjust for BSFC value. No argument there -mph is where it’s at
Madcow is clear over 300kw with 740s and E85 too, has a thread here somewhere. When only running ~20psi boost with a single 485 pump and upgraded wiring for it you can afford to raise the base fuel pressure a reasonable amount to bring the flow rate up from spec.
very safe lambda, if anything I'd say that's running a little rich than it needs to, from memory mine runs in the low .8's at full throttle. Edit: In fact if you look at the graphs, from 5000rpm the power curve dips a little, which corresponds with lambda dipping below 0.75. Bring that back up near .8 and I reckon you'd see the curve lift a little there. 0.75 lambda is 11.0 in gasoline AFR numbers.
We did a couple of years ago -it was good fun and a humbling experience. I haven’t been much up on events lately as I haven’t really got time and not having a running car is not great for motivation. If somebody else wants to get something rolling I’m happy to help (or stay out of the way) if needed.
wow 387rwkw on e85 and 740cc, impressed and confused. I bet you wish you fitted 1200cc side feeds to start with would of saved on labour and dyno time, if they were not available when you pieced it together I get it, if nostalgic I get it. But I will say it again, It takes the same effort to click buy on 740cc or 1200cc, It cost the same, its the same labour to fit, its the same ecu to control and doesn't care what CC but the out come is built in obsolescence at even mild power, if aiming over a 1000hp fit top feeds, anything under fit the largest side feeds to can get. this idles fine
Actually if you read his post, it's GT2860 RS turbos. They will generally make that much on 98 which sounds right for 740cc. They're on the laggy side of things though. If running E85 and higher boost they should be able to do an easy 400rwkw up to 450rwkw range. Completely different setup to stock turbos with a big E85 fuel system. Honestly instead of stuffing around with stock turbos, why not just bolt on GT2560s and do 300rwkw on 98? Tested and proven package. Not much more lag and very useable power band.
I read his dyno sheet were it states fuel: e85 which like rob260 pointed out would be at 120% duty cycle, but yes very doable on 98 and those turbos, I have also seen a package with the same turbos on e85 and 1200cc side feeds make 421rwkw at 68% duty cycle.
Morboost there is a difference between remanufactured (aka drilled bigger) injectors and originals. Personally I wouldn't run them. Also remember the OP was talking 300-350rwkw, not 1000hp! If you want to run 1000hp you need big top feeds and you need a shit load more mods.
Obviously they're not running at 120% duty cycle, this is what the calculator rob used would suggest they would need to run at.
With fear of hijacking the thread. If 1200 side feeds were to be used with GT2860 RS turbo's and 1 walbro 485. Is there enough pump and standard fuel line be big enough?
IMO, depends haha I was using 1000cc side feeds, with an 044 external, and ran out of pump at 600rwhp on 98.
So on one hand you say 740cc flow more than the calculator, the same calculator states 950hp from 1200cc at 90% duty cycle but don't work for under a 1000hp, what are you on mate.
??? I really think you've been sniffing that roo juice lol? I've got no idea what they hell you are talking about...
