A tuning tale: BLMs say lean, plugs say rich

[tpepmeie]

I’ve run Bosch IIIs in my engine without problem. Granted that’s with 93-95 injector housings. Why do you think they won’t fit?


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[XfireZ51]

Originally Posted by tpepmeie

I’ve run Bosch IIIs in my engine without problem. Granted that’s with 93-95 injector housings. Why do you think they won’t fit?


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Todd,

I have the 90-92 IHs. The 93-95 IHs use injectors that all seal at the tip like the secondaries do on the 90-92 IHs. I need injectors that also need to seal using the Oring in the IH secondary injector boss groove. The Bosch IIIs are narrow body injectors.
Currently thinking about either the Delphi units or trying to determine if Accel has changed the design of their injectors to eliminate the plastic aerator. My injectors are 10+ years old.

Bosch IIIs v Delphi units for 90-92 IHs.

[Ccmano]

I assume you’ve looked here for compatibility. Ford and Bosch/Ford injectors come in 22lb versions and they fit.

http://users.erols.com/srweiss/tableifc.htm

H

[Jagdpanzer]

With the Bosch III form looks like any dimensional compatibility issues could be easily solved with specially machined sleeve bushings for the primary injectors.


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[tpepmeie]

That would be excellent. They really are a fantastic choice. The design IV are similar form factor, and even better. But the full specs are not usually available. The IIIs in most cases have Ford motorsports specs published, one just needs to convert the specs from Ford to GM, which is not trivial.


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[-=Jeff=-]

I still have my FIC rebuilts.. 10 years

[XfireZ51]

Originally Posted by Jagdpanzer

With the Bosch III form looks like any dimensional compatibility issues could be easily solved with specially machined sleeve bushings for the primary injectors.


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Phil,

Actually I investigated this w both Southbay and FIC. There is a sleeve that is used for the Bosch IIIs on L98s which they both provide. However, they both told me it would not work for the 90-92 IH due to the need to seal the primary injector w the O ring in the primary injector boss. It will work for the 93-95 IHs as Todd or Jeff are using.
So I decided to go w the new Delphi injectors which, based on FIC pricing, are competitive w the Accels. I tend to lean towards use of OEM level quality rather than aftermarket. They’ll also be providing me w “deadtime” values to be used in the Voltage Bias tables. And I appreciate that the injector set will have been flow matched to +/- 1%. That provides additional value for me.
Here’s the video FIC posted regarding modifying Bosch IIIs for the L98.

https://youtu.be/XaYtP4l5A_4

Here’s FIC discussing use of Bosch IIIs for 90-92 IHs

https://youtu.be/OABElyDRicU

[Karl]

Originally Posted by XfireZ51

Dennis,

Glad u jumped in. I was going to ask u what ur using?
Don’t have answer on new Accels. Maybe someone else has info.

If you zoom in on the tip of these new Accell injections in this thread the tip looks the same.

http://www.zr1.net/forum/showthread.php?t=29954&page=2

[Top Toy]

Re the voltage bias, I assume you're referring to the pulse width correction vs. supply voltage? I did not get anything from FIC and am still using the stock table. Have you seen significant differences with other injectors?

[XfireZ51]

Originally Posted by Top Toy

Re the voltage bias, I assume you're referring to the pulse width correction vs. supply voltage? I did not get anything from FIC and am still using the stock table. Have you seen significant differences with other injectors?

Dennis,

I requested the Bias values from FIC and was told initially I didn’t them and to just use stock values. I’m from the school that says the info going into the ECM NEEDS to be correct in order to get the most accurate tune. I did this w the Accels and the VE tables were different for conditions such as Decel, Idle and low speed part throttle where the Bias plays a bigger role in the PW calc. I can let u know when I get them.