Miata Turbo Forum - Boost cars, acquire cats.
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Miata Turbo Forum - Boost cars, acquire cats. (https://www.miataturbo.net/)
-   General Miata Chat (https://www.miataturbo.net/general-miata-chat-9/)
-   -   What to fix on my Fuel System? (https://www.miataturbo.net/general-miata-chat-9/what-fix-my-fuel-system-85126/)

18psi 10-31-2015 03:41 PM
1 Attachment(s)
here's a dw300 at 60psi and id1000's at 90% on a thubawu

https://www.miataturbo.net/attachmen...ine=1446320505

that's uncorrected. dynojet would be 460-470

patsmx5 10-31-2015 03:51 PM
Originally Posted by 18psi (Post 1280038)
Just bump to 70 and see. Then 80. I think even 90 it will still work and give you enough headroom for now

I suggest starting with easiest/cheapest approaches first, obviously. You can always throw spensive injectors at it later.

Is your AFR at 12 accross the board? Is your timing all solid? Let's see a virtual dyno pull and where she's at power wise. If you're sub 400 then you need to figure out what's wrong because you should easily make 400 on current fueling, at least I think so. (and is the sc really eating 100hp? I ask because in that case you're likely near the limit)
The SC is eating 100HP at this boost level, maybe a touch more. SC's are great for running 6 PSI, they suck at high boost though. Whipple doesn't publish a chart that goes as high as I'm pushing it.

AFRs are at 11.5, I've been hesitant to go to 12.0 but I think I need to. Was going to test 11.5 and 12.0 at the track last night but got rained out.

EDIT: And timing is solid, I'm runnin 19-20 degrees of advance at 18 PSI boost.

18psi 10-31-2015 03:53 PM
no reason not to run 12
And get that VD so we can see where you're at.

patsmx5 10-31-2015 03:56 PM
Originally Posted by 18psi (Post 1280043)
no reason not to run 12
And get that VD so we can see where you're at.
I'll do a VD whenever it quits raining. It ran 8.04 @ 87mph in the 1/8 on the 18 PSI pulley. That was showing duty cycle at 75% then. Does that sound right?

18psi 10-31-2015 04:02 PM
12.6 @ 107 is what the calculator shows.
that's like 250-300whp

patsmx5 10-31-2015 04:05 PM
1 Attachment(s)
Originally Posted by 18psi (Post 1280047)
12.6 @ 107 is what the calculator shows.
that's like 250-300whp
Ok. At 18 PSI, the SC is only using about 75hp for that boost level. So does 75% duty cycle make sense in this situation? Or do you think something is wrong with the fuel system? I swear I've done everything in the fuel system.

Twin pumps, new filters
New 10 gauge wires/new relay to power both pumps. Measured voltage drop to confirm they're getting good power under load..
6 AN lines
Aeromotive regulator in engine bay
6 AN return line.
Wix fuel filter.
ID 1000's

EDIT: Datalog at 18 PSI
https://www.miataturbo.net/attachmen...ine=1446322139

18psi 10-31-2015 04:16 PM
The list looks solid, I don't really know what else to look for. DC just seems a little high given power level, but again the sc is eating lots of it so I guess it's close enough.

patsmx5 10-31-2015 04:26 PM
Originally Posted by 18psi (Post 1280050)
The list looks solid, I don't really know what else to look for. DC just seems a little high given power level, but again the sc is eating lots of it so I guess it's close enough.
Cool, thanks for the help. Off topic, but you'll note in the datalog I posted, air temps are now fantastic. :)

It looks like 900 buys a set of ID 2000s. I'm going to look around and see if there's any other option. If i buy these, I could sell my ID 1000s to get some of the money back. Still it seems crazy 900 for 4 injectors.

Savington 10-31-2015 04:54 PM
I would want to know what fuel pressure was doing (i.e. buy a sensor/gauge) before buying anything else.

patsmx5 10-31-2015 05:05 PM
Good point Sav. I'll do that, I think I have a sensor that will work, I'll just need some fittings to plumb it into the fuel system and a bit of wiring.

18psi 10-31-2015 05:33 PM
2000's are not gonna wanna idle as nice as the 1000s

patsmx5 10-31-2015 07:25 PM
Originally Posted by 18psi (Post 1280060)
2000's are not gonna wanna idle as nice as the 1000s
Even on E85? If so, :(

18psi 10-31-2015 07:28 PM
They will "work", but even on e85 the idle isn't gonna be as good, and I know you want it to remain an easy to live with street car.
I think 2000s are "gas" injectors or something like that. You can find theinfo I'm sure

aidandj 10-31-2015 07:36 PM
I think I've said this twice. ID 1300s. Designed from the ground up by ID. All stainless internals. Should give you enough e85 to kill your trans.

patsmx5 10-31-2015 07:37 PM
Originally Posted by aidandj (Post 1280076)
I think I've said this twice. ID 1300s. Designed from the ground up by ID. All stainless internals. Should give you enough e85 to kill your trans.
That's only 30% more than what I have, I want more than that. Tired of "upgrading" and not doing it enough that I grow out of it and have to do it again.

patsmx5 10-31-2015 07:39 PM
Originally Posted by 18psi (Post 1280074)
They will "work", but even on e85 the idle isn't gonna be as good, and I know you want it to remain an easy to live with street car.
I think 2000s are "gas" injectors or something like that. You can find theinfo I'm sure
I read they were for E85 only. Supposedly they can idle on E85, but not on gas. But I've never used them, and don't know anyone that's using them either. On the up side, being supercharged I keep the idle higher than normal, so I'll probably be ok on that front. As long as it will idle smoothly, I'm ok with it idling a bit high I do that anyways.

aidandj 10-31-2015 07:42 PM
The do the 1700s. They are the same new design. They partnered with Bosch to make them to their own design.

ID1300 and ID1700 - True Motorsport Injectors - Injector Dynamics

Should idle much better than the 2000s.

Reverant 10-31-2015 07:51 PM
The ID1300s will do 1900cc/min at 90psi.

Arca_ex 10-31-2015 10:07 PM
Originally Posted by 18psi (Post 1280074)
They will "work", but even on e85 the idle isn't gonna be as good, and I know you want it to remain an easy to live with street car.
I think 2000s are "gas" injectors or something like that. You can find theinfo I'm sure
You're on the right track. They start life as CNG injectors. Compressed Natural Gas. Most commonly found on buses in Europe.

ID1700's are a massive leap forward in drivability and durability for alternate fuels, as well as normal pump gas.

codrus 10-31-2015 10:10 PM
IMHO staged injection is the right answer. I'm sure you can hire a fabricator to add four more bungs to the EUDM manifold for less than half the cost of a set of ID2000s.

FM used to sell VICS manifolds with four injector bungs in them as a part of the 99 FM2 link piggyback kit.

--Ian


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