Author Topic: 62# or 80# injectors for a big dry kit? (Read 19857 times) Tweet

SLEEPERBUSA · « **on:** February 02, 2014, 01:45:35 AM »

I overthing shit.
Now that's out of the way, i'm wanting serious suggestions, yes' and/or no's.
I'm gonna use some numbers that are irrelevent Just numbers for conversation.
If I want 400hp on a dry kit and my engine makes 250, can I use 62# or 80# injectors to get there?
I mean, is it that easy?
This chart says a 32 jet will get me 152hp
http://store.schnitzracing.com/nitrous-jetting-charts/

MPS says that with RCC rail and their 62# injectors, there's enough to support 400hp.
http://www.mpsracing.com/products/MPS/Injector_62lb.asp

Instead of maxing out the system to get 400hp, could I run their 80# injectors and back up on the numbers on the fuel chart in the ECU Editor?

Thanks in advance.

dnhabusa · « **Reply #1 on:** February 02, 2014, 04:39:06 AM »

Just to clarify, it says that a 32 jet will gain 38hp. It says that (4) 32 jets will gain 152hp. I don't know if your intended dry kit uses 1, 2, or 4 jets so I thought that should be pointed out.

SLEEPERBUSA · « **Reply #2 on:** February 02, 2014, 05:16:28 AM »

Thanks. Yes, 4 jets.

Johnnnycheese · « **Reply #3 on:** February 02, 2014, 02:08:08 PM »

flow is always better than pressue

Abusive · « **Reply #4 on:** February 02, 2014, 02:14:10 PM »

I assume you already have an upgraded fuel pump? Without a fuel pump you are gonna have problems.

Johnnnycheese · « **Reply #5 on:** February 02, 2014, 03:01:46 PM »

again if you have bigger injectors no need to upgrade the pump to a point. Flow

SLEEPERBUSA · « **Reply #6 on:** February 02, 2014, 05:13:26 PM »

Yes. I am starting from scratch, so I can upgrade to any pump. It will be external.

SLEEPERBUSA · « **Reply #7 on:** February 03, 2014, 12:33:07 PM »

Nobody has sprayed a big dry shot like this?

RansomT · « **Reply #8 on:** February 03, 2014, 03:02:01 PM »

Quote from: SLEEPERBUSA on February 03, 2014, 12:33:07 PM

Nobody has sprayed a big dry shot like this?

Shot bigger, but engine only makes a little more than 200 wHP, total around 370 wHP.

I went a little different method, for ease of tunning. Using a high volume, high pressure external fuel pump, pushed the fuel pressure to ~75lbs and ran 36lb S2000 injectors. On my FPR, I use the pressure port so that idle and part throttle sees less fuel pressure.

With that said, that is the limit with those injectors and fuel pump. If and when I spray more, I'm going to modify a set of 70lbers and drop the fuel pressure.

To answer your question: if your FPR is adjustable, you can always go with the 62lbers and raise the pressure when needed. But you need to know the limits of your pump flow vs. pressure.

SLEEPERBUSA · « **Reply #9 on:** February 03, 2014, 04:50:04 PM »

That's good info right there. THANKS.
I'm asking these questions because it sounds right in MY head, but MY head has easily been way off before.
Since MPS is advertising these as injectors for the top side, is it safe to say that my idle and low end tune wouldn't be affected?
I can remember when using the S2000 injectors, when we turned it up in order to spray bigger, it dirtied up the bottom end.
I want an easy 400HP, so I was thinking the 80# injectors and not use them as hard, rather than stretching out the 62# injectors and possibly running out of injector.

Is that line of thought correct?

Bim28 · « **Reply #10 on:** February 04, 2014, 10:02:16 AM »

62lb injectors will get you to 400 with less then 80% injector duty. You will need a high volume fuel pump with 43 psi. I wouldn't use ECU editor spraying that much gas. That's JMO.

RansomT · « **Reply #11 on:** February 04, 2014, 10:08:49 AM »

Quote from: Bim28 on February 04, 2014, 10:02:16 AM

62lb injectors will get you to 400 with less then 80% injector duty. You will need a high volume fuel pump with 43 psi. I wouldn't use ECU editor spraying that much gas. That's JMO.

That is what I was thinking with duty cycle. My S2000 injectors are "acting like" 48 lbers with 75 psi of fuel pressure and since I can still "tune them", they would have to be less than 91% duty cycle. 62 lbers would probably be enough. Using my setup as a baseline, 62lbers should support 450 wHP without getting crazy high duty cycles.

SLEEPERBUSA · « **Reply #12 on:** February 04, 2014, 10:49:59 AM »

More good info. Thanks.

Bim28, why not use Editor?
I have a separate controller, but was trying to make it simple. I guess I could use the Boost by Smith harness to power the controller, then go to the solenoid???

SLEEPERBUSA · « **Reply #13 on:** February 04, 2014, 10:52:03 AM »

If I don't use the Editor, how would I control the fuel ramp in first and second?

RansomT · « **Reply #14 on:** February 04, 2014, 10:56:23 AM »

Quote from: SLEEPERBUSA on February 04, 2014, 10:52:03 AM

If I don't use the Editor, how would I control the fuel ramp in first and second?

Gen 2?

SLEEPERBUSA · « **Reply #15 on:** February 04, 2014, 02:57:05 PM »

Yes, 2011

Bim28 · « **Reply #16 on:** February 04, 2014, 06:27:05 PM »

Quote from: SLEEPERBUSA on February 04, 2014, 10:49:59 AM

More good info. Thanks.

Bim28, why not use Editor?
I have a separate controller, but was trying to make it simple. I guess I could use the Boost by Smith harness to power the controller, then go to the solenoid???

It's just my personal opinion. I would rather use a basic flash and control and data log from another source. I've had friends bikes mess up when trying to shoot 100 on ECU editor/Whoolich. I'm in no way bashing it. It's just what I have seen. You would need to ask some of the site sponsors/turners how it worked for them. They have way more experience then most of us novice guys. You can reach out to some of the guys like Cycle Concepts, Sportbikerider and johnnycheese. They won't lead you wrong.

RansomT · « **Reply #17 on:** February 04, 2014, 06:47:57 PM »

Quote from: SLEEPERBUSA on February 04, 2014, 02:57:05 PM

Yes, 2011

Even more so that you can use the 62# injectors, you still have the Primaries.

I use ECUEditor, gen 1 and have tuned a many Gen 2 nitrous bikes.

SLEEPERBUSA · « **Reply #18 on:** February 04, 2014, 10:13:10 PM »

Quote from: Bim28 on February 04, 2014, 06:27:05 PM

Quote from: SLEEPERBUSA on February 04, 2014, 10:49:59 AM
More good info. Thanks.

Bim28, why not use Editor?
I have a separate controller, but was trying to make it simple. I guess I could use the Boost by Smith harness to power the controller, then go to the solenoid???

It's just my personal opinion. I would rather use a basic flash and control and data log from another source. I've had friends bikes mess up when trying to shoot 100 on ECU editor/Whoolich. I'm in no way bashing it. It's just what I have seen. You would need to ask some of the site sponsors/turners how it worked for them. They have way more experience then most of us novice guys. You can reach out to some of the guys like Cycle Concepts, Sportbikerider and johnnycheese. They won't lead you wrong.

SLEEPERBUSA · « **Reply #19 on:** February 04, 2014, 10:13:59 PM »

Quote from: RansomT on February 04, 2014, 06:47:57 PM

Quote from: SLEEPERBUSA on February 04, 2014, 02:57:05 PM
Yes, 2011

Even more so that you can use the 62# injectors, you still have the Primaries.

I use ECUEditor, gen 1 and have tuned a many Gen 2 nitrous bikes.

Yessir. The primaries is what I was refering to for the low end tune.

ninjafreek · « **Reply #20 on:** March 10, 2014, 09:33:10 PM »

Chris I wish I could help but all my experience is gen1 Old school

mps 62lb injectors are a little harder to tune on the gen1 We've found
Good luck

SLEEPERBUSA · « **Reply #21 on:** March 15, 2014, 03:48:53 PM »

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Author Topic: 62# or 80# injectors for a big dry kit? (Read 19857 times) Tweet