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I was looking at someone's .gct. The car is supercharged, and has a 3-bar sensor. On all the tables, the maximum value is 314 kPa. Except the VE table- this only went to 109! Did I discover some sort of glitch? Or did I just drink too much melonade? Shouldn't that be at 314 like the...

I am overanalyzing here, and getting all confused. (Gee, never done that before) Let's say that I have an 83# injector. Well if I reference the FP to boost and the fuel pressure drops at idle (let's say from 43# to 36#), do I now have a 74# injector? The ECM thinks it is an 83# injector...

I am trying to learn what's been going on. My car has been missing a cylinder for a few months, finally I wound up sending the fuel injectors out to PTE. They tested all the fuel injectors out, all but one was normal. It's the abnormal one that I want to learn about. They said that the...

I am trying to learn what's been going on. My car has been missing a cylinder for a few months, finally I wound up sending the fuel injectors out to PTE. They tested all the fuel injectors out, all but one was normal. It's the abnormal one that I want to learn about. They said that the...

Spent some time with tyrefryer yesterday tuning his car. Great car, BTW! I love it. Anyhow, we had a couple of weird things happen, including something strange going on with the IAC that had us very confused. While driving around, the IAC motor was jumping all over the place- up over 100...

For the most part, I agree that if you are going to spend the extra money on a programmable controller, you should have a pretty good idea what you are controlling and how it works, etc. I think if you understand that, this is a very intuitive system that 98% of the parameters can be easily...

Just thought that I would share the results of an experiement with y'all. I have a NA 455 engine, with the Fel-Pro (i.e. FAST) controller. I use this car as my daily driver, and strive for both performance and drivability/gas mileage. Ever since the FI has been installed, I have not liked...

I have a '69 Big Block. I have converted to FI, and would like to use an in-tank pump. Can I just use a GN setup complete with sending unit & fuel pump, and drop it into my tank? Will it fit, or am I gonna have to make a custom unit? Thanks! -Bob Cunningham bobc@gnttype.org

Is there a way to automatically go into Open Loop when I arm the nitrous system (or somehow use only open loop when nitrous is activated)? Or, do I have to go in through Calcom when I want to change it? I'm just wondering about when I am driving innocently on the highway, and that...

Set the clock (it's like 15 minutes off) -Bob Cunningham bobc@gnttype.org

Okay, my alternator just went on the fritz, while I had loaned my car to someone. Fortunately they recorded a few runs. The thing I don't understand is that even though I had very little voltage correction, I had tons of black smoke out the tailpipe, horrible idle, and lots of O2 correction...

If I give my car to a valet, can I put the rev limit at 2400 high/2000 low? They don't need to go any faster than that... Or could this lean out some cylinders and cause detonation? I have an MSD but I don't have chips to go to that low of an RPM limit... -Bob Cunningham bobc@gnttype.org

I've been leaving my FAST set for 12.2:1 on the nitrous, but I get the feeling a lot of people go richer (11.2 - 11.5:1) on the bottle. My engine didn't like 12.2. Just as a general poll, I'm curious what other people set their target A/F for on the juice. Thanks, -Bob Cunningham 1969...

I've been having problems with pistons staying in one piece lately, so I'd like to double-check with other guys on the board who run nitrous with their Speedpro (or anyone else that could tell me their A/F). What is your target A/F when you use nitrous? Please also tell me if how much HP...

If you set the nitrous system to come on at 4,000 RPM, then when you shift to second gear, will the nitrous system de-activate? Or, will once it is activated, will it only de-activate when the TPS drops (and ignore the RPM)? -Bob Cunningham bobc@gnttype.org

I am in the process of trying to figure out why I broke a piston. I run a 455 Buick with the Speedpro and nitrous. Last weekend, I pulled some fantastic times at the track (on a 150 shot), drove home, and discovered that apparently at some point during the evening I'd cracked a piston. I...

So, I'm reading David Vizard's book on Nitrous Oxide Injection just now, and I come across the calculations that tell me that N2O to Fuel ratio should be 9.6. Ack! All of my speedpro settings are set for about 12.2:1 at WOT. Does this mean that I should try for an effective 11.3:1 or so...

During normal driving, the engine will bog a bit when leaving from a stop. For example, if I'm pulling away from a stoplight (regular driving- not a WOT launch or anything), the engine will rev up to speed and pull the car, then bog for a second, then recover and start pulling again. I can...

For those of you in the New England area who don't already know, there is a group called NEBRA (New England Buick Racing Association) that has lots of local events. You can find out more at www.nebra.org and sign up for their mailing list! (The group isn't associated with GSCA or anyone...