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Has anyone tried using 2.3T injectors on their 900T? I have an 88 900T which suffers from lean mixture after all my mods: SD APC/blue injectors/fuel pump, RRFPR, MSD ignition & boost timing control,Jak Stoll chip,aquamist.
AF ratio is great if I raise the fuel pressure at idle to 60 psi but I would rather run a stock 3.0 bar FPR and run the stock 43psi.
I can either use SD red series injectors or try some Saab 9000 (1991) 2.3T injectors that I have on the shelf (0280 155 009).
Has anyone got experience with either of these? Better still, flow or hp figures for them?
 

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you might want to try red injectors from trionic 5, 9000 94 >, ng900, 9-3 > 99, as far as i know these are the biggest stock injectors saab fit ;)


not to be confused with red injectors from a 9-3 99> or 9-5 these have trionic 7 and have different fittings to the manifold
 

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Yes, you can.

I had some from a 2.3 9000 and they worked great.

My car would have been running rich, but I have an adjustable AMM, (L.H. 2.2) and leaned it out a few turns to compensate.


I did however, just put T5 injectors in. I need to make more adjustments.


And HERE is a great injector site.
 

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boxman said:
not to be confused with red injectors from a 9-3 99> or 9-5 these have trionic 7 and have different fittings to the manifold
Interesting comment. I was looking at 9-5 Aero red injectors and they have drillings around the outside of the injector. I wondered if they were supposed to modify the injector spray pattern with increasing airflow

Part of the problem with conventional injectors is that the spray cone narrows with increasing air speed. Widen the cone and at low air speeds the injector's spraying fuel into the manifold runner walls.

I suspected the drillings on the 9-5 Aero injector might have been designed to solve that design problem.

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An old thread I know!!!

I am wondering if a set of injectors from an Classic 900 for would work ok in a 1993 9000 CSI.

Tech 2 suggests I have an injector fault, lean. On the road on float throttle it surges, on acceleration it is fine, as it is on deceleration.

9000 has 370,000km
C900 has 98,000km.

I am hoping the computer will adjust for any differences.

Robin
 

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Do you know why?
 

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I'm not sure how to answer that.... you can't substitute batch-fired injectors for a 2l motor in a motor that isn't a batch-fired 2l. The flow rates would be markedly different.
 

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Yes, re the flow rate.

I wondered what makes the difference?

Is it the ECU, with the duration, etc, or is it the physical design of the injectors?

Given that above someone has tried 2.3 injectors in an earlier 2.0, I might
just take them out get them checked, and try it.
 

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The ECM is programmed to pulse injectors for certain lengths at certain increments based on the specific flow rate of the injector, which is chosen specifically for the engine into which it's going to provide consistent low-rpm performance and appropriate high-rpm performance. Replacing an injector of flow rate X with an injector of flow rate Y will result in the ECM's calibrations being wrong. Some margin of error can be compensated for, but that margin is not large.

I would not for an instant consider swapping injectors without knowing specifically the differences are. Undersized injectors can result in physical damage to the motor (detonation, etc.). Oversized injectors can result in damage to other components - fouling spark plugs, ruining catalytic converters, and in the long term even wear on the bottom end. You do you, but these aren't risks I'd take.
 

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Interesting comment, and thank you.

Your comments are the reason I am taking both sets to an injector technician for testing.

And you heads up re flow rate is definitely something I will be getting checked.

If the are the same in flow rate, I imagine those that have done 98,000km are going to be a better choice than those that have done 370,000km!
 

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Many thanks.

Bring checked this week.
Do you know if the injectors from.the C900 fpt, approx 1988 year, are the same as for a 92 C900 lpt?
 

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I think I looked this up recently and found they were not, but I don't have a specific recollection. If you get the Bosch part number you can find the flow rate.
 

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Great. The guys (injection specialists) will be checking that.
 

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Again, Many thanks. Both sets checked, and came up OK. 9000 injectors Flow rate 70, C900 flow rate 67/68, according to the technician.

Robin
 

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70 what?

Stock c900T injectors are something like 23.6lbs/hr at 3bar (though Saab runs them at 2.5bar), which is something like 250cc/min. I don't know what injector measurement would be "70."
 

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I knew I missed something!
It is the flow into the calibrated test unit of their particular tester.

So it does not line up with OEM specs.

When he first tested them one was rich, after a clean, they came up even.

It appears to have cured the surge on float. But a bit early to tell for sure.

Only did 45km test run.
 
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