mrfred

iTrader: (50)

English Racing says that Walbro 255s flow really high initially, but after a bit of use, they loose their initial edge, so I'll be curious to see how long your AFRs remain steady.

evolved0414

iTrader: (5)

Yea mychailo I'm definitely going to keep an eye on the walbro to make sure it doesn't start taking a crap on me. Luckily 255's are so cheap its not too bad if I have to change it every now and then lol.

tscompusa

iTrader: (31)

definitely interesting. but if he switched to a new fuel filter also i think that has a lot to do with it as well.

he just passed 480whp and the afr didnt creep higher then 11.6. however the fuel map is pegged rich at high RPM.

I told him this is not a safe way of doing things and should be only temporary. going to share the final graph shortly.

at 29-30psi uptop we are over 480WHP. i just sent him off again with alittle more boost uptop, waiting for him to send the new log.

phizzalot

iTrader: (3)

Good stuff to know in this post. Now time to apply it.

tscompusa

iTrader: (31)

well he did not get his 500WHP goal, and he really wanted that number. I tried to really push the boost up top hardcore and the car started to detonate, so that tells me we are out of turbo for his mods & of course fuel.

Keep in mind, this cars on HKS 272 oldschool cams, aka very mild conservative cams that should be discontinued based on the other cams out on the market right now.

Here is the final graph for now that will be staying on the car. with a simple cam swap & a double pumper it will put the car around 520WHP solid without changing boost.



dip at 6200RPM ish is where the maps richened, but then you see it goes leaner. Its going leaner on its own. the map is FULL RICH almost in the top end past 7K+.

This car needs a double pumper on it.

evolved0414

iTrader: (5)

As tom stated above, I did not make my 500hp goal. However, that doesn't mean that the car isn't a blast to drive. It feels awesome throughout the gears and as tom stated, with a simple cam swap and double pumper I'll definitely break 500+ safely.

I was telling tom tonight while we were tuning about how much I've learned from him over the years. Being able to actually talk to someone about your tune in explicit detail is something you just can't put a price on. Sure, taking it to a shop and letting someone sit in the drivers seat of your car and tune it is easier, but I guarantee you they don't know their ROMs and maps like Tom's customers do. I feel that with the knowledge tom has given me, I have been able to be way more self-sufficient with my car.

Thanks again Tom, and I'll be hitting you back up when I get some s3's and a double pumper!

-Zach

mrfred

iTrader: (50)

i think we had almost this same exchange earlier in this thread, but having to go full rich on the fuel map shows that fuel demands are well beyond what the 255 can supply and that fuel pressure is in the gutter.

the cute thing about our testing is that knowing the limit of the 255 provides a rough means of assessing dyno numbers. for the most part, i no longer believe any dyno numbers over 500 whp that were obtained for an evo running e85 with a single walbro 255 as the only fuel system mod.

tscompusa

iTrader: (31)

well you have to keep in mind that some setups that are more efficient and can make more power with less boost it may pass 500whp on e85, but i am 100% on saying that i wouldn't recommend this fuel pump for anyone on e85 that wants more than 440-450WHP dynojet. 450whp seems to be as much as you can get out of it safely and that seems to be pushing it.

He did have a 416lph walbro installed but something was severely wrong, or he did not install it properly because it was leaner than the single modded was. I dont know if he discussed that with you in pm or not. he definitely didnt make it seal right im guessing and was leaking all the fuel pressure into the gas tank.

funyun

iTrader: (7)

With the double pumper how much can you get out of those 1000cc injectors on e85

mrfred

iTrader: (50)

depends on whose 1000 cc/min injector - conservatively maybe 450-500 whp at stock base fuel pressure. cranking up the base pressure can get a bit more, maybe 30 whp.

tscompusa

iTrader: (31)

500whp on e85 would be conservative for 1000cc inj with a double pumper. 1200 pte made 627 on a dynojet in std mode with a double pumper on a stock block i tuned that i shared awhile back.

mrfred

iTrader: (50)

1200/1000 = 1.2, and 627/500 = 1.25, so I'd say 500 whp on 1000s is right in line with 627 on 1200s. It will depend on several factors, including ethanol content. E85 in the Portland area is consistently 82% ethanol, so I have a hard time supplying enough fuel for 500 whp on 1100s even with proper fuel pressure.

tscompusa

iTrader: (31)

well in that case then 500 on 1000's would be in the 90%'s. i think that car that did 627 STD was 95% or so idc.