I found an old thread that stated the 700 series single barrel TBi could be fitted with a high pressure injector rated at 30 psi.
FJ10485, Rock Auto shows this fits a 1995 Kodiak 6.0L. It appears the same as the 700 series injectors, It crosses to a Standard Motor TJ32
I see on Summit Listings for TJ47,TJ33,TJ54,TJ55. Does anyone know the lb per hr of any of these and rated fuel pressure?
Flow rates for these seem to be difficult to find.
No need to re-invent the wheel. But we can make it better
Sometimes homework is needed to figure out the injector flow.
The attached .zip has a Base Pulse Width (BPW) calculator spreadsheet. The example shown in the spreadsheet is for ECM 1227747 5.7 liter TBI with a BPW of 135 which algebraically shows the injector flow of 61 Lb / Hr. which aligns with the BPW setting in a 1227747 5.7 Liter TBI chip (.bin file).
The calculator requires the following information: Displacement, Cylinders, and Injector Flow Rate.
If there is a .bin file that aligns with the injectors you're asking about, then the Injector Flow Rate can be solved algebraically by the BPW spreadsheet.
I don't know that there are any known bins. Applications listed seem to be for heavy duty stuff like p30 vans and Kodiak trucks?
No need to re-invent the wheel. But we can make it better
According to that thread, stock fuel pressure is basically 30psi or so.
BPW at zero percent is 134.
So If I'm understanding everything right, the FJ10485 / TJ32 for the 366 is about 65 lb per hr at 30 psi.
No need to re-invent the wheel. But we can make it better
The thread I shared is from nearly 9 years ago. I'm unable to find the information from the 1993 C6000 tune.Originally Posted by ralmo94
Possibly this thread is further research for a single TBi injector 4-cylinder swap?
Along those lines . . . . Holley 552-43 Injector: https://www.holley.com/products/fuel...e/parts/522-43 Fuel Injector 60 PPH@12 PSI ~ 85 PPH@21 PSI
Yes it is. I was concerned with having too much injector for a 91 cubic inch engine. The TBi I have is from a 1990 cavalier 2.2 and uses that small style injector. I was thinking I could possibly get one of those injectors and run at lower pressure. Everything I found for j car is that they use the standard 13psi. Is there a j car i4 bin? Maybe all this isn't needed and the injector in my TBi is fine? like
No need to re-invent the wheel. But we can make it better
My experience with 4-cylinder TBI computers is mostly with the 2.5-liter Fiero, with definition $1C using ECM 1226864. The 4-cyliner Fiero TBI system is a simple TBI system with adequate junk yard / aftermarket support. The $89 definition using ECM 1227727, like the 1990 Lumina 4-cylinder TBI system, has less junk yard / aftermarket support than $1C.
$1C throttle body pictured below:
84 - 86 Fiero Throttle Body.JPG
I wonder at what point the injector is too big for idle and has minimum pluse?
I don't really have any experience in that area yet.
I know 2bbl goes sync and async for better idle.
I know I have read about cranking fuel pressure pressure on trucks and needing vacuum referenced regulator so the effective injector size is still small enough at idle.
So I guess the question is what is the minimum pulse width of TBi injectors?
No need to re-invent the wheel. But we can make it better
any tbi injector will work up to 50psi. I have personally gone as high as 32 psi. if you are overfueling at idle then goto a vacuum referenced FPR. this will run a lower pressure @ idle
Do you have any idea how much would be too much for a 1.5 liter engine to idle?
I'm planning a swap and have a TBi from a 2.2 rated at 13 psi.
If 13psi is too much for idle, it doesn't really give me anywhere to go with a vacuum referenced regulator.
No need to re-invent the wheel. But we can make it better
I've looked at the 1226864 / $1C link http://www.gearhead-efi.com/Fuel-Inj...Information-1C
Algebraically, the 1986 Fiero 2.5 liter has an injector flow of approximately 45 Lb / Hr.
Interestingly the 1986 Fiero 2.5 liter has a BPW of 160, the 1985 J-Car 1.8 liter has a BPW of 115 which aligns with the 2.5 and 1.8 using same injector part number?
Possibly the 1227727 / 2.5 liter has an injector flow rate of approximately 45 Lb / Hr? Unfortunately, gearhead-efi does not have $89 information to learn what the 1227727 / 2.5 BPW is.The $89 definition is available from TunerCats, on a "pay-per-view' basis. http://www.tunercat.com/
45 pph sounds like it would be fine. If extra room is needed and everything was correct, the 366 injector turned down to 12 psi, would be about 40 pph.
Wish I had a 1.5 TBi bin to see what size OE used for injector size.
No need to re-invent the wheel. But we can make it better
you would need to try it and see if it can keep the idle mixture where it is commanded.
If I do need to add an external regulator, Wich I might do anyway, do you just plug off the return line from the TBi? As the external regulators have their own return.
No need to re-invent the wheel. But we can make it better
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