PSI40L Member 175 Member For: 22y 19d Posted 23/12/02 04:09 PM Author Share Posted 23/12/02 04:09 PM turbo6man y do u have to remap the timing the ecu recognises any changes it is vct remember.anything above7 psi will lead to detonation what are you saying have u looked at the technology u can run the turbo with standard ulp at 10psi the heads used are aluminium u can get away with running the higher compression ALUMINIUM disperses heat alot quicker than iron .VL turbos are running prehistoric gear at 8:1 comp 12psi and run all day long with no probs .u better have a closer look at what we are dealing with here as long as u have the fuel pressure there there should be no problems the only thing im not sure of is what volume the injectors sre capable of flowing . THis is what is worrying me??? Link to comment Share on other sites More sharing options...
Turbo6man Lifetime Members 4,084 Member For: 22y 2m 26d Gender: Male Location: South Coast NSW Posted 24/12/02 06:42 AM Share Posted 24/12/02 06:42 AM matchew> With some judicious fiddling with what you've mentioned 280kw is probably likely - it seems the ECU is not as strictly controlled as we were led to believe and there does seem to be some scope built into the system. If the boost sensor of the original system can be bypassed and a microfueller added along with an add-on ignition modifier, then probably something around 330kw at 9 psi boost without cracking the engine apart (well, except for a thick copper head gasket). There are a lot of IFS but I'm sure we won't have long to wait before CAPA relaese their upgrade system, and Herrods are probably in there playing as well. Link to comment Share on other sites More sharing options...
Turbo6man Lifetime Members 4,084 Member For: 22y 2m 26d Gender: Male Location: South Coast NSW Posted 24/12/02 07:00 AM Share Posted 24/12/02 07:00 AM PSI40L> I was referring to ignition timing not valve timing - even with the knock sensor it will not retard ignition enough to compensate for the boost you were referring to at the 8.7 compression ratio the engine has. You would have to retard the timing at least 6 degrees from 3000 rpm on I would expect, so you need an after market ignition modifier to remap the timing curve for the 12 psi boost you are wanting to run.Your suggestion of simply pushing more fuel in is not the answer as you will be running way too rich and losing power. Alloy heads or not, the heat is in the explosion, and it will put holes in tops of pistons before any head damage occurs if you have any detonation present.The basic fact is that the amount of boost you want to run defines what compression ratio you must use - if the compression is too high for the boost all the other things are simple compensatory and have the same net end result as running lower boost in the first place. I stick by my assertion that about 7psi is probably the max this engine will accept at 8.7 compression. Link to comment Share on other sites More sharing options...
scott52 Member 188 Member For: 22y 12d Gender: Male Location: Perth, W.A. Posted 25/12/02 05:44 AM Share Posted 25/12/02 05:44 AM Tell me how you installed the gauge and where did you mount it? Link to comment Share on other sites More sharing options...
Guest driftin Guests Posted 25/12/02 01:27 PM Share Posted 25/12/02 01:27 PM A fuel cut defender is a bleed valve, and nothing else. It is not the type of bleed valve you plumb between the turbo supply and wastegate, but it has the same purpose, bleeding air from a hose receiving boost pressure.Most turbo cars have a hose that the ECU reads boost pressure from, in order to cut fuel when it sees an overboost happening. By plumbing in a bleed valve here, the ECU thinks there is less boost being produced than there really is. You adjust the bleed valve to set the fuel cut wherever you want (within reason).On a WRX for example, fuel cut is at approximately 17-18psi. Plumb in an FCD, unwind it just a little and you can set your fuel cut at 20psi (unwind it further if you want to increase it -- but not recommended, wastegates do ocassionally fail).Adam Link to comment Share on other sites More sharing options...
Guest driftin Guests Posted 25/12/02 01:30 PM Share Posted 25/12/02 01:30 PM Sorry about the caps didnt notice . it is called a fuel cut defender from turbo smart it is an electronic fuel regulator that is operated with a solenoid so it wired thru the standard computer. as boost is increased the compression in the motor also increases this sets the right fuel pressures for your head chamber to avoid detonationYou would think if you didn't know what you were talking about, you would just keep your mouth shut? Why do you just make stuff like this up off the top of your head? Link to comment Share on other sites More sharing options...
CJF077 The Noble Leader Administrator 4,786 Member For: 22y 2m 25d Gender: Male Location: Sydney Australia Posted 25/12/02 09:52 PM Share Posted 25/12/02 09:52 PM Adam (Driftin) what's the benefit though of having a fuel cut defender? To increase boost?Sorry Im a newbie to all this turbo mumbo jumbo.. Link to comment Share on other sites More sharing options...
Guest driftin Guests Posted 26/12/02 02:42 AM Share Posted 26/12/02 02:42 AM Adam (Driftin) what's the benefit though of having a fuel cut defender? To increase boost?Sorry Im a newbie to all this turbo mumbo jumbo.. If the motor has a fuel cut at a certain boost level, you can increase that level by bleeding air off the hose it uses to measure boost level.There's no doubt the XR6T has a fuel cut, but at which boost level is anyone's guess -- half of the info on this forum is stuff people have heard and passed along regardless of its validity so I wouldn't trust any info about this until its proven.A fuel cut defender may or may not be useful on an XR6T, but I would say not. An FCD does not affect your fuel mixture in any way, increasing boost will though, and noone knows yet whether the motor will run lean or rich (or perfectly) when boost is increased. Hence it may, or may not be possible to increase boost safely without an aftermarket ECU.I would wait for a reputable workshop to successfully modify an XR6T before listening to any of the garbage that has been posted about the car on the Internet thus far. It's frustrating when people like PSI-40L make up stuff (or embelish something they've heard), stuff that they don't understand, and then post it for everyone to spread further.PS/ The talk about the ECU retarding timing until the car is undrivable if boost is increased beyond 6.5psi is also just a rumour, we should all wait and see.Adam Link to comment Share on other sites More sharing options...
CJF077 The Noble Leader Administrator 4,786 Member For: 22y 2m 25d Gender: Male Location: Sydney Australia Posted 26/12/02 05:41 AM Share Posted 26/12/02 05:41 AM I agree with you about your comments. I would rather someone else a reputable performance shop do the mods and let us know about the results. A few companies such as AVO, TurboSmart and some others are going to talk about their mods on the site.. Stay tuned. Link to comment Share on other sites More sharing options...
PSI40L Member 175 Member For: 22y 19d Posted 26/12/02 06:28 AM Author Share Posted 26/12/02 06:28 AM driftin it goes to show how mush u know as well it seems that u dont even now the basics of suck ,squeeze , bang ,boom if u look at the side of your garrett turbo it is a 0.5 compressor do u know what that means and what it is good for ? I ran a 10 sec big block if I dont know what im saying then u must be onur roller skates still The day run a 10s car u call me have ever dealt with ems and other products and tuned a car with that type of processor .holley annhillator now makes an ignition systion where u can physically retard and advanc e your timing on each cylinder u can achieve the best curve depending on what type of fuel u run on your bike son do a bit more research b4 u go off talking Link to comment Share on other sites More sharing options...
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