SC400TT Project Car Stage II by SC400TT

4 minute(s) of a 718 minute read

Well Gang, it has been a little while since I posted up anything...I want to update you on where we are...

I trailered my car over to my friends house where he has lots more room than I do, and no HOA to complain.... The engine and transmission are now out. The process to reassemble the new motor, and swap the almost new parts from the stock engine to the new engine begins next week Monday. I hope to have the engine and tranny swap completed by mid April, then the car goes off to paint, then the reveal...If all goes well, May will be the reveal...It has been over 2 years.

4-25-2007

Guys, I just paid the Machine shop. I will be picking up my built engine any day, and we will be performing the swap... Finally...Stage II is about upon us...

Pics are coming...

4-26-2007

Thanks, Scott. I will. Only thing I am disappointed in is that we never dynoed Stage I. But it was just not convenient to do so, I could neverf get the retroed intake back from the fabricator in time so I could dyno it.

In Stage II, I am adding the fuel enhancements even iof someone else has to make them, so, I have a question for all you tech guys out there regarding the Stock ECU.

Gang, I have been pondering this just for the last day now, and have not found anyone that is sure of the answer, so I want to post up here to see if anyone can provide the correct information.

I will be keeping the stock ECU on my SC400 Project Car even after I install the built engine which I am just now picking up from the machine shop. I will be adding a piggy back with an external Delco MAP to the system. So, I will have 2 Walbro 255 pumps, and 2 separate fuel systems in the car. The stock one stays in place, and the secondary includes 8 440 cc injectors run by the piggy nack that will connect to the stock ECU, and will adjust fuel on the secondary fuel system, and will change timing as necessary.

MY question is does anybody know what the Stock ECU is doing when we hit the Rev limiter past 6500 rpm? Is it an ignition cut, a fuel cut, a timing change, or a combination of the above? My reason for asking is this:

I am adding the BoostLogic built A340 4 speed trans and Precision trany to the equation, and I have no experience on how the car will shift until I get it on the road. They did adjust line pressures and make several modifications to the stock valve body so that the tranny will shift much quicker, but it will still be civil during normal driving. I am sure there will still be a delay between gears, although shorter. If I shift the gears manually, and miss the sift point and cause the rpm to hit the rev limiter, if this is a fuel cut, will this not caus ea temporary lean condition? If I am in high boost when this occurs, I am concerned about the danger to my engine... 

I can adjust the piggy back to change the pulse cycle of the secondary injectors in the map and adjust the timing when past 6500 rpm as a safety factor, if needed, or I can tune in a fuel cut as well. But, I will need to know what the stock ECU is doing...