Tuesday, October 24, 2006 - 07:39 am, by: Mike Bradberry(Halflife)
Yes I have done a search and can't find out exactly how to remove the rev limit on a V8. Can anyone tell me if the rev limit is removed if I fit a unichip?
Tuesday, October 24, 2006 - 09:44 am, by: Harry Lemmens(Wombat)
It cannot be removed without reprogramming one of the chips in the ECU. (Or another ECU).
Actually, I should say that its easy to change the rev limit, 100% removal would be very difficult. Can be pushed all the way to 8000 RPM easily enough though.
The ECU actually has two stages to the REV limit. There is the soft limit at around 6750 RPM, and a very definate hard limit at 8000 RPM. The only way you can normally get to the hard limit is via a fiarly gross gear change.
Easy to change once you can actually reprogram the chip. Not easy to get to that stage though.
Tuesday, October 24, 2006 - 11:11 am, by: Harry Lemmens(Wombat)
You need a "Mod" board. (Specifically for the V8)
Plus, there are several other chips required.
I have none left! They cost me a fortune anyway.
Roughly $1K just to get 10 boards made. (The boards are cheap enough ... $10 per bare board ... its the Artwork plotting charges and other NRE associated with circuit boards that drive up the initial cost.
I currently have absolutely NO time to work on ECU mod boards and code, but may get around to a second revision in a few months.
I could also do a MOD for the TT's, but most people seem happy going with SAFC's or interceptors or ... so there is very little point. (Well, not exactely true ...)
I do have code out of a TT ECU that already is "Hot" ... from one of the more popular Japanese companies that did/do mods. The fuel and timing tables are very obvious in the TT ECU so there would be no problems tuning them ...
Tuesday, October 24, 2006 - 04:15 pm, by: Carl Johnson(Carlos)
Hi Harry same Q as on that other post.......any news on when tuning software might be avail for your mod ECU. Which I must say is: I feel like one of the very lucky few to have your ECU in my car
You dont actually have to manualise your gear box if you get an after market ecu. I have a microtech in mine and the auto works fine, all you have to do is leave all the inputs to the standard computer in place and cut the outputs i.e injectors and coil
Brian Timms TryHard New South Wales TT Soarer Goodness.
Friday, April 13, 2007 - 08:14 pm, by: Brian Timms(Turbo_brian)
Harry,
I currently own a TT Soarer, and I am very interested in doing fuel mapping, Limit modification, and learning more about the way the machine runs, but also want to stick with the standard ECU for the moment (my personal preference).
What are the costs like to do these modifications to the ECU to run the mod board (I assume a daughter board ROM chip with fuel map and other hard coded info), as I would be happy to help fund a round of TT mods if others also want to jump in on this.
Remembering here that the Stock ECU talks to the stock sensors, requires no mod sensors, no modified wiring, works from the box, and strangely enough is plug and play with the stock Soarers.
Also, if this rom modification is anything like the Stock Bikki boards for the Nissan CA, SR, VG, and RB engines, then switching ROM chips is as simple as shut off, open cover (some have hinged their covers for this reason) and lifting the ziff handle, remove chip, place on new chip, lower ziff handle.
Very convenient for altered conditions, summer-winter maps, Extreamely high octane maps, limp-home maps, even Velet mode map (I have a Velet mode map for my CA 180sx, rev limiter kicked in at 2,900rpm and the speed limiter was set to 60km/h).