We just did some fuel and electrical upgrades on ERA 753. The recent work consisted of:
1) Installation of a slightly larger, flow matched set of Siemens injectors from Marren (motor is a 482 ci FE; old injectors were Ford "Green Tops" rated 42 lbs/hr, new Siemens injectors are rated at 55 lbs/hr)
2) Improved the current carrying capacity of the primary wire circuit of our MSD system
These are two minor upgrades that I have been wanting to do for some time. The injectors were mostly about reducing fuel pressure a bit and allowing my injectors to run a little less duty cycle at high output. The new injectors were fully flow matched by Marren to within 2% of each other. Marren provides detailed injector performance information as part of their injector prep services. This includes injector deadtime numbers which are usually not available:
Using the Marren provided injector flow data and I was able to with use the individual cylinder correction features of the FAST XFI to balance the injectors to within 1%.
Also, I felt that the coil output looked a tad weak when I first installed the MSD setup on the car and I wanted to make sure the primary wiring was completely up to snuff. I used a gauge heavier wire for the primary circuit this time and eliminated a connector at my MSD box.
The immediate result of all of this was a smoother idle which is a good sign. I will need to do some re-tuning of the car for the new injectors which will probably have to wait until spring at this point.
I can recommend Marren as a source of high quality, matched fuel injectors. I've used their injectors on both of my EFI projects and have gotten good results with them. Marren provides injector flowing and matching services and they are great when it comes to providing fuel injector recommendations for a given application. You can check out their website at:
http://www.injector.com/
BTW, we are starting to contemplate our next project. As we've done previously, I am looking to do something totally different in terms of engine and car. We're thinking along the lines of the following but with a little bit more power
:
This is a 41 Willys coupe with a blown and injected big block Rat Motor. It probably makes about 700 HP (the blower setup, CAM, and tune on this car are "mild"). If we did something like this, we'd do a 41 Willys but with a blown Hemi (and EFI of course). If we based this on a 540 ci stroker Hemi or maybe a 528 ci version, we should make around 900 ft-lbs of torque and around 1,000 hp on pump gas. This car would definitely be an automatic trans car. Not sure if we will do this project or not - just playing around with some ideas....
- Fred
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