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| xhon20s |
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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 |
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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.
_________________ STREETBUILT RACING |
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| xhon20s |
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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 |
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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
_________________ STREETBUILT RACING |
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| xhon20s |
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nar its not a dodgy resister thing it plugs into the back of the ecu
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| xhon20s |
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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 |
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{USERNAME} wrote: nar its not a dodgy resister thing it plugs into the back of the ecu
Ah, it must be the new "Premium" version 
_________________ STREETBUILT RACING |
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| xhon20s |
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yer it got a diode aswell
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| XR9UTE |
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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 |
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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? {USERNAME} 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.
_________________ EL II XR8
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| XR9UTE |
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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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| jaysway |
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on a v8 auto the engine tps is the one on the top and the auto tps is the one on the bottom, correct?
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| benj78 |
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Followed the above.. well the base idle bit so far, haven't got around to TPS yet due to lack of multimeters.. But it fixed all my woes!!
Idle was sitting around 600rpm. Up-ed it to around 900rpm. No more hunting at idle. No more stalling when coming to a stop. Thanks to all for this sticky!! |
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| benj78 |
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I have a few questions on setting the TPS on EF XR8.
I've done the base idle, set it to somewhere between 850-900 when warm. Pierced the green wire and black wire, hooked the probes up, but the reading was 5v. This was with ignition at II. When the ignition was at I, the reading was around 0.57. Would this just be a grounding issue, or something mechanical? Regardless, on the engine TPS, the screw holes don't appear to be elongated at all. I loosen the screws, but it only moves 1-2mm at most. Is this normal? Also, where's the other TPS module for a manual? Thanks! |
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| XR9UTE |
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Manuals only have one TPS.
You have to elongate the holes yourself. |
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