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Originally posted by JoBy We had already installed larger injectors and done modifications in the eprom when we started using E85. We just modified the injector constant when we started using E85.
What did the duty cycles look like before and after the E85 switch? I'm going twin turbo soon and I'll need to upgrade my injectors so I was looking at how people with similar setups were doing. You guys switching to E85 also was just an added bonus.
The HEI ignition was the only thing on the stock engine that did not like Ethanol in combination with boost. We started to have problems when we got closer to 15 psi boost at higher RPM. At 10psi to was fine. The problems got worse at higher RPM. Fredrik shifted the stock engine at 5000 RPM but the new one can go a lot higher. A waste spark ignition can keep full spark power at much higher RPM than a distributor system.
It is also easier to tune because you don't need an eprom programmer. I have never used a MegaSquirt before and I want to try it and see how I like it. We are going to install it using a short adapter cable to the stock harness, so we can go back to the stock ECM if we want to.
__________________ Boosted and intercooled L98 with 749 ecm
10.72@129-1.5 60ft(new best time Nov/2010)-570rwhp@13lbs on pump gas. Est. 600+rwhp@16lbs on 100 octane. Capable of 18lbs, but havent done it, ok maybe once.
Featured in GMHTP mag July 07
Last edited by TurboedTPI; 08-06-2005 at 04:59 PM.
Crank trigger wheel. The sensor is behind the water pump pulley.
EDIS-8 ignition module.
Two dual waste spark coils.
MegaSquirt and pigtail to stock ECM harness.
We had to re-wire the fuel pump relay. The stock ECM put 12V on the cable to engage the fuel pump. MegaSquirt grounds the wire.
Once we had that sorted out it started on the first try. It had a good idle from the start and the lambda was a bit rich but not too bad. Without any tuning exept for configuring engine size and injector size it was very driveable. It ran better than the with the stock ECM from the first start. Now the tuning can begin.
I see you are using the internal Megasquirt MAP sensor. There is some interesting reading in the DIY PROM board with a thread called "map sensors". It applies to how you have yours set up.
Originally posted by junkcltr I see you are using the internal Megasquirt MAP sensor. There is some interesting reading in the DIY PROM board with a thread called "map sensors". It applies to how you have yours set up.
You can also use an automotive OEM map sensor with the Megasquirt. The MS-II set up page talks about it. You send the MS the OEM signal instead of the onboard MAP sensor and adjust the voltage using the MS Tuning software.
I was thinking of using a MS-II someday but never really liked the MAP sensor being on board because it acts as a water storage tank (think water injection). It is a nice setup because it is simply to use an OEM MAP sensor instead.
I am not saying it is bad to have it on the circuit board. Just something to think about if things don't "seem right" while tuning.
Crank trigger wheel. The sensor is behind the water pump pulley.
I love seeing the Mega-Squirt fuel control with EDIS ignition. Seems like a very powerful and reliable set-up, and I am planning to use it for at least one of my future projects, and if that goes well, probably my TT IROC-Z.
How did you get your trigger wheel centered on the balancer/crank pulley? Do you have any pics of the sensor mounting?
.. oops! ... They are on the garage floor somewhere 
I want a turbo IRoC
