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xhon20s
Fordmods Parts Gopher
Posts: 62
Joined: 07 May 2008
Location: ipswich QLD, Australia
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 Posted: Fri Sep 19, 2008 9:03 pm Post subject: |
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just ading somethin. i got this chip that i put in my car awhile ago and when its in the idle is really irratic and usually stals first time you start it. and it also runs really rich. but when i take it out everthing appears to be fine..... well kinda
when what im gettin at is that do i need to change the tps to suit??? as its been metioned previously. or is it that my chip is just rooted |
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XH5LWEPN
Fordmods - Getting Side Ways
Age:22
Posts: 1761
Joined: 13 Aug 2005
Location: Perth WA, Australia
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| Posted: Fri Sep 19, 2008 9:08 pm Post subject: |
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What is this chip you speak of?
The only chip that will ever make its way into my car is rotten maccas one stuck between the seats. |
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xhon20s
Fordmods Parts Gopher
Posts: 62
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Location: ipswich QLD, Australia
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| Posted: Fri Sep 19, 2008 9:22 pm Post subject: |
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| hahaha yer it looks a bit like that. lol its from hypertech. i got it from ebay for 50 bucks. it worked once whenb i first put it in my car but i couldnt notice any difference in performance because my tranny was rooted but once i got it fixed i stuck it back in and it ran like poo |
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XH5LWEPN
Fordmods - Getting Side Ways
Age:22
Posts: 1761
Joined: 13 Aug 2005
Location: Perth WA, Australia
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| Posted: Fri Sep 19, 2008 9:36 pm Post subject: |
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Oh god.
Rip it out and throw it away. They are no good. From what i understand all it is is a $2 resistor that you splice into the MAF (?) harness that tricks the ECU into dumping more fuel in.
They have been around for a while.
There are much better ways to get more performance out of your 5.0L.
Jeff |
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xhon20s
Fordmods Parts Gopher
Posts: 62
Joined: 07 May 2008
Location: ipswich QLD, Australia
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| Posted: Fri Sep 19, 2008 9:41 pm Post subject: |
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| nar its not a dodgy resister thing it plugs into the back of the ecu |
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xhon20s
Fordmods Parts Gopher
Posts: 62
Joined: 07 May 2008
Location: ipswich QLD, Australia
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| Posted: Fri Sep 19, 2008 9:42 pm Post subject: |
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| lol resisters are like 2 cents hahaha and my old man has s**t of em. hey btw what mods have you done to your car |
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XH5LWEPN
Fordmods - Getting Side Ways
Age:22
Posts: 1761
Joined: 13 Aug 2005
Location: Perth WA, Australia
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| Posted: Fri Sep 19, 2008 9:43 pm Post subject: |
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| xhon20s wrote: | | nar its not a dodgy resister thing it plugs into the back of the ecu |
Ah, it must be the new "Premium" version  |
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xhon20s
Fordmods Parts Gopher
Posts: 62
Joined: 07 May 2008
Location: ipswich QLD, Australia
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| Posted: Fri Sep 19, 2008 10:03 pm Post subject: |
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yer it got a diode aswell  |
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XR9UTE
EFI Guru
Age:43
Posts: 1514
Joined: 05 Nov 2004
Location: Perth WA, Australia
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| Posted: Mon Sep 22, 2008 10:23 am Post subject: |
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| Hypertech don't make anything to suit aussie EEC's so that's likely the problem. Of course I don't which EEC you're using? |
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EL2XR8
Fordmods - Getting Side Ways
Age:30
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| Posted: Thu Nov 20, 2008 2:07 pm Post subject: |
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I've got my auto tps set to 0.98 and the other to 0.97.
What would happen if they were set back to say 0.8 or 0.9?
Just get a lag? no real benifit is there?
Reason I ask is that I still occasionally get a violent couple of surges which lead to a stall when turning the engine on?
| XR9UTE wrote: | Just to add to that...
The reason the idle voltage needs to be under 1v is because if you're over 1v the EEC thinks it's in part throttle mode.
This is the number one cause of rolling idle and stalling after people have modified their engine because they crack the blade open further to gain a higher idle but don't realise they must elongate TPS holes to enable the correct setting. This causes the EEC to see part throttle mode when it's actually idling so the ISC control becomes erratic.
The three modes are; idle mode = less than 1v
Part throttle mode = 1v to 3.7v (WOT breakpoint is 2.7v which you add your idle voltage to)
WOT mode = anything over 3.7v
Bringing your TPS voltage to 0.98v is just a way getting as close to 1 volt without going over therefore reducing the delay in time from idle mode to part throttle mode. The performance is greater.
TPS does not in itself control fuel it is only a means for the EEC to look at certain maps that apply to that mode.
In idle and part throttle modes the EEC will look at closed loop maps for fuel and spark.
If load exceeds 70% or you hit the WOT TPS breakpoint the EEC looks at WOT maps and ignores the HEGO's ie; open loop control.
Pete. |
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XR9UTE
EFI Guru
Age:43
Posts: 1514
Joined: 05 Nov 2004
Location: Perth WA, Australia
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| Posted: Thu Nov 20, 2008 7:19 pm Post subject: |
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Have a look at your engine TPS volts when you start. You may be experiencing a surge over 1v momentarily on startup?
You'll probably not notice if you drop your TPS back to .97 for the engine but dropping it back to .8 will likely be noticeable. |
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