need bigger injectors using stock fuel rail which injectors should i use?

[86_sports_1jz]

i'm using jdm 44Os but i want to upgrade to bigger side fed injectors using stock fuel rail bcuz i have driftmotions fpr kit & do not want to change that cuz i just got it recently. Besides sard injectors what other brands r there?

[tissimo]

mkiv 550s.. sard makes up to 850s i think in side feeds they get pricey though....

[86_sports_1jz]

how do i know which sard injectors will fit my stock fuel rail when they make different versions of the same size injectors i dont know how to identify by part # which one is the right one 4 me?
mkiv 550s.. sard makes up to 850s i think in side feeds they get pricey though....

[Nomad707]

injectors are stupidly expensive IMO.

go with 550's

[Bondango]

You can get drop in 850cc injector which come with the necessary fitting collars, though in US$ your looking at around $110 each :3d_frown:

[RacerXJ220]

The stock rail won't support larger than 550cc meaning it won't flow enough fuel for anything larger.

I'm running Sard 800cc's, and found out after the fact. I am going to look into having a bung installed on the stock rail, and running dual feed. It would be a lot cheaper than buying a top feed rail, and new top feed injectors.

If you need larger than 550's, top feed rail with top feed injectors is the best way to go.

[tissimo]

The stock rail won't support larger than 550cc meaning it won't flow enough fuel for anything larger.

I'm running Sard 800cc's, and found out after the fact. I am going to look into having a bung installed on the stock rail, and running dual feed. It would be a lot cheaper than buying a top feed rail, and new top feed injectors.

If you need larger than 550's, top feed rail with top feed injectors is the best way to go.
jza71 on SF dynoed 701whp with the stock rail and 800cc injectors.. I didn't think it'd flow more then 600whp my self..

http://www.supraforums.com/forum/showthread.php?t=443126

[Van Diesel]

but did he do that with completely stock (as in stock setup) or did he have a return line welded in the center to make the ends both feed lines.

[tissimo]

I'd assume dual feed..

[Van Diesel]

as would I. There for it would be a modified dual feed stock rail.

[RacerXJ220]

I always wondered a way to run dual feed with a T fitting where the lines go into the rail, and running that to the AFPR. Would that work? I'm still trying to figure out a way around it myself.

Also, the Sard 800cc's are Denso direct replacements, you do not need any special modifications to use them.

[Rich]

I always wondered a way to run dual feed with a T fitting where the lines go into the rail, and running that to the AFPR. Would that work? I'm still trying to figure out a way around it myself.

Also, the Sard 800cc's are Denso direct replacements, you do not need any special modifications to use them.

I think it would work fine, pressure in a fluid distributes evenly in a volume and you still would have enough feed from both sides in max. conditions.
I'd say smart thinking sir!

I have these Sard 800's on a modified stock rail (welded return in the middle)

[bigaaron]

I've been planning my new setup using the cold start injector hole for the afpr, and using a y to feed fuel at both ends. I don't need the cold start injector with the standalone.

[annoyingrob]

Also, the Sard 800cc's are Denso direct replacements, you do not need any special modifications to use them.
Yes, Sard, as well as most other companies just re-sell Denso injectors.

I run Denso 800cc injectors myself. What you need for a 1JZ would be Denso 800cc high impedance side feed with a 2 hole spray pattern. They're a brown top.

I would tell you how they flow, but my fuel pump ran out of steam around the 450whp mark, then afterwards my thrust washers and my crank had a disagreement. Once it's rebuilt I'm going to try two Walbro 255s in series, and start finding the choke points in the fuel system.

[Rich]

Yes, Sard, as well as most other companies just re-sell Denso injectors.

I run Denso 800cc injectors myself. What you need for a 1JZ would be Denso 800cc high impedance side feed with a 2 hole spray pattern. They're a brown top.

I would tell you how they flow, but my fuel pump ran out of steam around the 450whp mark, then afterwards my thrust washers and my crank had a disagreement. Once it's rebuilt I'm going to try two Walbro 255s in series, and start finding the choke points in the fuel system.

Why not run a second feed and switch the second pump at boost? You'll get the most from both pumps that way and you know for sure you'll have enough juice to feed the 800's.

[annoyingrob]

Why not run a second feed and switch the second pump at boost? You'll get the most from both pumps that way and you know for sure you'll have enough juice to feed the 800's.
Because the flow rates I've seen of the series pumps Are sufficient for what I want, and I like the idea of series pumps, as the whole system can still flow at very high pressures, which is nice if you're talking about restrictive fuel systems, it can push through it. I also don't like the idea of turning a fuel pump on and off while I'm driving around. I prefer to keep them both on. My ECU will be monitoring fuel pressure pretty soon anyways.

[tissimo]

I've been planning my new setup using the cold start injector hole for the afpr, and using a y to feed fuel at both ends. I don't need the cold start injector with the standalone.
this aint no 7m.. :biglaugh:

Remove all banjo fittings in the fuel lines (1 at the fuel filter, then 3 on the feed... 2 at the fuel pressure dampener and 1 at the rail).. will increase the flow

[Rich]

Because the flow rates I've seen of the series pumps Are sufficient for what I want, and I like the idea of series pumps, as the whole system can still flow at very high pressures, which is nice if you're talking about restrictive fuel systems, it can push through it. I also don't like the idea of turning a fuel pump on and off while I'm driving around. I prefer to keep them both on. My ECU will be monitoring fuel pressure pretty soon anyways.

Ehm, two pumps on a seperate feed will pump more than two on the same feed. But if series pumps is sufficient for you I can understand you don't want to go through the hassle.

But I'm curious why you don't like the idea of a boost activated pump? I don't like the idea of a full tank of fuel being pumped around in less than 10 min all the time, it warms up the fuel.

[annoyingrob]

Ehm, two pumps on a seperate feed will pump more than two on the same feed. But if series pumps is sufficient for you I can understand you don't want to go through the hassle.

But I'm curious why you don't like the idea of a boost activated pump? I don't like the idea of a full tank of fuel being pumped around in less than 10 min all the time, it warms up the fuel.
You're right, the dual feeds with two parallel pumps will flow a whole bunch more fuel then the two series pumps, but you are also right when I said the two series pumps will be enough :)

As for the boost activated pump, I've had bad experiences with motors going lean when the secondary doesn't kick in, however I had forgotten about the fuel heating issue. I may change my mind, and run a boost activated pump. It wouldn't be that hard to disable the inline pump I guess.