1G Injector Limit

[TheToyman75]

10.8 to be exact.
GT3540 from memory he was running with the 1.04 (Hence the nitrous to make it useable)
Stock cams too.

Seriously, ring the workshop.
I've seen the car, I've seen the slips,
I've seen the dyno print outs.

I'm not bullshitting.

It was only 6-12 months ago everyone was saying that you couldn't make 500RWHP from an RB25DET with stock internals. Now they're popping up everywhere.

If you don't beleive me, doesn't bother me, but I'm being 100% serious when I tell you what it was used for, and how it was setup.
But if you want proof, ring the workshop.

I don't question for a second that the power output is possible with stock internals BUT NOT WITH STOCK INJECTORS !

Rod.

[JustCallMeOrlando]

Indeed, i'm with Rod. You can't argue with the laws of physics. They can only flow so much fuel.

[The Witzl]

I have to agree with Rod.

Here is the translation of the laws of physics, courtesy of Witzl Systems.

[BLK1g-gte]

Hehe thats Gold. By all means i agree with ROD, thats is just physically not possible.... Do the Math.

Yeah i did work out that my injectors are good for 378hp at the motor. I Don't think the Safc is going to cut it with 440cc injectors. I have heard of places hi-flowing your stock one, anyone know anything about that??

I think if i do put a Welbro pump and turn the pressure up a bit i could pull it off. Like forcefed said economy will suck at higher pressure but then again i never had economy to start with so i wont miss it. With higher pressure 400hp at the fly is possible and that equates to more then 200rwkw so looks like i be the gunny pig and see what the limit of the stock injectors is with a better pup and FPR
Thanks for the input fellas

[celicapain]

go monsiuer black. I had heard that when people high flow injectors they pull em apart and remove the squish plate( goes between the pintle and seat) which lets em flow heaps more, but it also makes injectors that are hella hard to tune due to their erratic operation(they dribble)

[TheToyman75]

BLK1GGTE,

My RA28 has 3/8 fuel lines, motorsport lift pump and motorsport mian pump. The fuel system is designed to feed all any any possible developments I may embark on so is massive overkill for what it needs at pressent.

I am hoping to push the stock 1G past the 200rwkw mark as well If you look at my last Dyno graph in the xG Dyno thread you can see that my AFR's start to lean out with the power curve. Personally I beleive this is because they are reaching peak flow. It seems to plateu at 12:1 which is actually a nice mixture so I am hopeful we can squeeze the extra 8kw I am chasing from them. At worst a Sard fuel pressure reg and a slight increase to the base fuel pressure will do it. Its by no means the nice or recommended approach but I wanted to see how far I could push the factory set up. The same engine with aftermarket management would be so much nicer to drive and have more power under the curve.

As for hi flowing the top feed injectors its not ideal. The common process is to drill the holes in the injectors oversize using tiny diamond drills. They will never flow exactly evenly again tho and can get difficult to control. The correct way to do it is of course to not increase the base fuel pressure (as you increase the load on the entire fuel system) and fit a suitable sized replacement injector. SInce yours is an Auto you really need to run a piggyback style ECU. Personally I recommend the Xede as i think I may have mentioned to you before. That being said...... Good luck on the 200+ KW hunt

[slipway NZ]

around 200kwatw, i ran 202rwkw and the a/f was leaning out to around 12:1, so id say that would be the rough limit..

Plenty of power tho!

[BLK1g-gte]

Thanks for the info Toyman. Always informative posts.
Hey tell me how do you get around the AFM boost cut (1G fuel cut) since you are running 1.1 bar. I ask as I won't be taking any fuel out with the Safc up top which means I won't be able to cheat the ECU into thinking its getting less fuel/air hence it will cut me at 15psi. Very curious to know how you got around it. Does a HKS FCD work on the
1G since its AFM activated?
I guess we are both chasing the same thing, trying to get the most out of the stock combo, albeit I will have cams and cam gears with Hi-flowed turbos to make up for some loss due to the Auto trans, running sender benders and a more tired engine. But we'll c.
I won't go for the Xede unless this piggybacks i have don't do the trick. Thanks for the the tip but.
I am in the process of buying a Welbro pump and SARD FPR.

Last question what about Raising rate FPR. That way fuel pressure will only go up with the boost, meaning I won't be putting extra pressure trough the injectors at idle and off boost. Would this work????

Slipway was that Auto or manual 1G??

Thanks for the input fellas. I couldn't do with out all this informarion ...
200rwkw FTW...Man on mission

[slipway NZ]

manual running auto ecu, apperently runs abit richer.

[TheToyman75]

BLK 1G-GTE,

I haven't done anything to stop the car hitting boost cut. Depending on what gear I am in boost cut seems to come in just over 1.2 bar of boost. On Stitts Cruise on Friday peak recall up the mountain had me at 1.28bar and a max of 5600rpm

Cam gears are high on my wish list and I will be getting some once I can. For now tho the Twin Dumps are going on, the boost controller will be set up properly and the front strut brace has been ordered. Then its getting put aside for a while.

And yes a rising rate reg could indeed be the option. Dodgy but could work well for what we are both trying to acheive

[Karma Supra]

Twin dumps??? I take it these are stock fitment for use on stock turbos??? Any pics? I didn't know there was such a thing for the 1G as there is so little room!

I am also trying to get a bit more power froma 1G, management wise I'm running a Mines ECU which removed the fuel cut, and and apexi SAFC-II to alter the fueling, I was looking at 7M-GTE injectors but was put off by the impedance

[TheToyman75]

Here is a teaser for the new Dump pipes. My RA28 Members rides thread has more pics and details. There is a link to it in my Sig



Still waiting for some Dyno time to see how she goes now.

[Karma Supra]

Very impressed, and equally jealous! I didn't think there was enough room between the turbos for a "proper" setup! I need to find a fabricator I trust in the UK, that won't charge me the earth!!

[BLK1g-gte]

I'll be very interested in gains with this Toyman....By the way i had a Base dyno done today....Very happy. This was done on only 12psi. The first dyno is all std AFR, The green one is when the dyno operator fiddled with the NEO SAFC for a bit. Again improvments are in the bottom end...Heaps more to go, waiting on cams and put in cam gears and then tune the timing with a SITC and further tune the fuel. Looks promising but. I was getting 130rwkw at 1 bar before...

Here is the dyno graph



Interesting to note that the AFR is at 12 even at 12psi , so i think its not the injectors running out but the ECU calling the shots...What i am interested is when the injectors start getting leaner...

[TheToyman75]

Awesome !

Looking forward to the end result mate.