ctchme's Exa

Callumgw · Post by **Callumgw** » Fri Jan 27, 2012 1:36 pm

if you boys are feeling clever, I'm sure you'd be able to cobble up an Arduino solution....

C

ctchme · Post by **ctchme** » Fri Jan 27, 2012 2:04 pm

lol, not coming from me, cant stand arduino haha, if i need extra outputs or inputs i just use the proto area on ms2

Matt

ctchme · Post by **ctchme** » Mon Jun 11, 2012 5:45 pm

hey again guys, a bit of an update, i ended up maxing the 850cc injectors, so have ordered some bigger ones, would have never thought id need bigger, but going for some 1300cc injectors. Have upgraded the fuel pump to a bosch 040 in tank pump, and an adjustable fuel pressure regulator, set at approximately 45 psi.

Anyway, will upload some pics later when i get my camera working properly lol

poeticjustice88 · Post by **poeticjustice88** » Mon Jun 11, 2012 6:59 pm

you maxed out 850cc squirters? really ?

Post by **15exa** » Mon Jun 11, 2012 7:12 pm

ctchme wrote: i ended up maxing the 850cc injectors

was this on E85? how much boost

Post by **tassuperkart** » Mon Jun 11, 2012 7:14 pm

Im willing to bet they are NOT 850's. Even on E85.
Im betting they are the smaller 550 13b versions.

make sure of this before you go up to such big squirters or youll make the thing a total beeyatch to tune.

L8r
E

poeticjustice88 · Post by **poeticjustice88** » Mon Jun 11, 2012 7:15 pm

im no wizard harry, but i really cant see how you maxed em out.

i had a 13BT S4 Rx7, and got 427 ponies out of it before i needed to change mine. Whether that is relevant to another engine im not sure, but i am thinking you havent maxxed em out. as 15exa asked, what boost are you running ?

Timmzy · Post by **Timmzy** » Mon Jun 11, 2012 9:07 pm

I'm going to ask the obvious question. At what HP level did you max out those injectors? Maybe you maxed them out because you dropped fuel pressure, but tried to wind more duty cycle into them? which would explain the fuel pump upgrade.

850cc would be enough to support over 450HP from our engines....over 100HP/cyl which is damn impressive I must say.

Darren.

Damo · Post by **Damo** » Tue Jun 12, 2012 9:22 am

Timmzy wrote:I'm going to ask the obvious question. At what HP level did you max out those injectors? Maybe you maxed them out because you dropped fuel pressure, but tried to wind more duty cycle into them? which would explain the fuel pump upgrade.

850cc would be enough to support over 450HP from our engines....over 100HP/cyl which is damn impressive I must say.

Darren.

+1

If your pump will only flow 120kw, you can put any sized injectors you like behind it, and it will only make 120kw!
You are maxing the standard pump.
If you like though, ill give you a 20 for the injectors you are replacing.

Damo

poeticjustice88 · Post by **poeticjustice88** » Tue Jun 12, 2012 9:39 am

dont be pinching my upgrades boy-o !!!!

lol

ctchme · Post by **ctchme** » Tue Jun 12, 2012 11:18 am

yeah it was running e85, duty cycle was at roughly 85% with 10psi, as i dont have an intercooler yet, i am using the fuel's natural cooling properties and higher octane to prevent pre detonation, and to achieve that, you are correct, i had dialed the pressure down. And thanks for the offer but the old injectors arent for sale, they are goin on my mx5 lol

Damo · Post by **Damo** » Tue Jun 12, 2012 2:20 pm

Just a bit of quick calculating

E85 makes around 100kw per litre of fuel flow.
A E15 with the mods you have listed running 10psi would be making 110-120kw max! 1.2ltr x .85 / 4 = 350cc injectors @ 85%. Far from the 850 or even 550cc injectors you have stated. You would have to have your base fuel pressure set at 16psi (20psi below standard) to drop even the 550's to 360cc!

Something doesn't add up.

Are you sure your pump isn't shagged?

Damo