Matt Harwood Posted September 19, 2002 Share Posted September 19, 2002 Ahh, it's Leon that does the Walbro's. I thought it was Chris. I would prefer an internal one. When changing pumps, do you need to alter the wiring to give the pump a constant 12v instead of the stock 9/12v set-up? Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 19, 2002 Share Posted September 19, 2002 Matt loads of people can get Walbro's, I am sure Chris can too. Yes there is a 12v wiring Mod on MKIV.com. I am unsure as to the validity. Is your a J spec or UK. It does make a difference with this mod. Quote Link to comment Share on other sites More sharing options...
GavinL Posted September 19, 2002 Share Posted September 19, 2002 Originally posted by Matt Harwood Ahh, it's Leon that does the Walbro's. I thought it was Chris. I would prefer an internal one. When changing pumps, do you need to alter the wiring to give the pump a constant 12v instead of the stock 9/12v set-up? I have a Walbro running in 9v/12v mode no problem. Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted September 19, 2002 Share Posted September 19, 2002 Mines a J-spec. I've looked at the mod on mkiv.com and I don't like it very much. It means that the fuel pump would be constantly live all the time the ignition is on regardless of if the engine is running. I am about to convert it to run 12v anyway because I'm getting a little bit of detonation just as the 2nd turbo comes on line. I'm using a changeover relay that operates from 5-15v. This way I'm still getting the correct operation from the pumps ecu but a constant supply voltage of 12v+ Do you know what the difference is with the UK car? Quote Link to comment Share on other sites More sharing options...
GavinL Posted September 19, 2002 Share Posted September 19, 2002 Originally posted by Matt Harwood Mines a J-spec. I've looked at the mod on mkiv.com and I don't like it very much. It means that the fuel pump would be constantly live all the time the ignition is on regardless of if the engine is running. I am about to convert it to run 12v anyway because I'm getting a little bit of detonation just as the 2nd turbo comes on line. I'm using a changeover relay that operates from 5-15v. This way I'm still getting the correct operation from the pumps ecu but a constant supply voltage of 12v+ Do you know what the difference is with the UK car? I don't think there is a difference between cars on the 12v mod. Are you sure it is det your getting on the switchover, my car use to stumble during the switchover but that was traced to a faulty fuel regulator. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 19, 2002 Share Posted September 19, 2002 Right don't take this as gospel because I don't know anyone with a UK car that has a fuel pressure gauge installed. On the J spec the pump changes from 9v to 12v as soon as any positive boost is made. It was clearly visable on my gauge. The UK car from what I gather, doesn't. It works via the MAF sensor & therefore doesn't bring it in until a certain flow or rpm I can't determine which. If you are getting det at the change over point ( this is where it happens on most) then a SAFC or similar would be a good idea just to richen her up a little around this point. I do agree with you on the 12v mod. I now have one pump running 12v constantly ( via the new ecu) & another running 12v via the ECU but not coming in until the engine makes 5 psi of boost. I can vary when I bring it in. I need to speak to you about ICE soon Matt so we can discuss it in detail then. Quote Link to comment Share on other sites More sharing options...
Nic Posted September 19, 2002 Share Posted September 19, 2002 If someone can post me the part numbers for the UK spec injectors, pump and resistor pack I'll check out the costs at the weekend, cheers Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted September 19, 2002 Share Posted September 19, 2002 Gavin, Are you running with a FMIC? and are your turbos still sequential? - When does the 2nd come in? My reason for asking, since I've fitted a FMIC, my 2nd turbo now comes on line earlier than before. It used to come in at dead on 4000rpm, now it comes in at about 3600-3700. Not that it bothers me, I'm just guessing that as the pump hasn't switched to 12v by that time, it's running a bit lean for a second or so. This probably isn't a problem on your car as you have decent sized injectors to start with Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted September 19, 2002 Share Posted September 19, 2002 I do agree with you on the 12v mod. I now have one pump running 12v constantly ( via the new ecu) & another running 12v via the ECU but not coming in until the engine makes 5 psi of boost. I can vary when I bring it in. I need to speak to you about ICE soon Matt so we can discuss it in detail then. Amytime Terry, I can feel some serious brain picking coming on! Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted September 19, 2002 Share Posted September 19, 2002 Originally posted by Nic If someone can post me the part numbers for the UK spec injectors, pump and resistor pack I'll check out the costs at the weekend, cheers Any chance you can find out anything about the high impedence injectors that Randy spoke of? Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 19, 2002 Share Posted September 19, 2002 No problem Matt. PM me a tel no please. Quote Link to comment Share on other sites More sharing options...
randy Posted September 19, 2002 Share Posted September 19, 2002 Originally posted by Terry Saunders Walbro do various pumps, but none that actually flows more than a UK Bosch pump( CW sells a bosch internal that will flow more). The only reason I used two Walbros is that they draw less amps than the UK so are easier on the stock wiring when running 2. They are also noticably louder than a UK pump. Randy's statement scares me a little. Yes you can run a single on one internal pump but not a big single & you would need to be very careful what boost pressures you run. I would also want a constant overview of the A/F's. Always go for a safe option. Leon sells Walbro's CW gets great prices on UK Bosch pumps. Excuse me! I was refering to the fuel upgrade for the stock turbos not for a single turbo like the T78. I would definately buy a fuel kit from sound performance or someone which would include the dual walbro pumps, fuel rail and SS fuel lines etc. To maximise the use of the T78 turbo. However if you keep the boost really low say 16psi running regular fuel you are fine with just the single fuel pump and upgraded injectors as you would probably make only about 500/550+hp. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 19, 2002 Share Posted September 19, 2002 SORRY! Quote Link to comment Share on other sites More sharing options...
Nic Posted September 19, 2002 Share Posted September 19, 2002 I can not find any information about the brand Randy mentioned. Randy if you have a web address for the company let me know and I'll see if my local place can give me a cost. BTW Randy I'll get back to you this weekend with some info. Quote Link to comment Share on other sites More sharing options...
GavinL Posted September 19, 2002 Share Posted September 19, 2002 Originally posted by Matt Harwood Gavin, Are you running with a FMIC? and are your turbos still sequential? - When does the 2nd come in? My reason for asking, since I've fitted a FMIC, my 2nd turbo now comes on line earlier than before. It used to come in at dead on 4000rpm, now it comes in at about 3600-3700. Not that it bothers me, I'm just guessing that as the pump hasn't switched to 12v by that time, it's running a bit lean for a second or so. This probably isn't a problem on your car as you have decent sized injectors to start with I think my 2nd comes on at about 4200. Interesting effect your FMIC has had on your car, I have never heard of that before Quote Link to comment Share on other sites More sharing options...
randy Posted September 19, 2002 Share Posted September 19, 2002 Matt, I had the same problem your talking about. I did the 12 volt fuel mod and it kind of improved but did not go away completely. The det has nothing to do with the intake temp from the Intercooler!! I was told that the Jap spec pump is just not capable of handling anymore than 350hp. So a new high performance pump like walbro will help. There is also the FUEL PULSATION DAMPENER MOD! {replacing fuel line from the fuel filter to the fuel rail thereby bypassing a fuel pulsation dampener which is supposed to be a hinderance to fuel flow} I don't get this problem when I am at WOT just happens when Im like slowly accelerating up to 6000 RPM on 2nd 3rd or even 4th. Also this is at boost levels of just 1.1 bar. I have a walbro pump that is waiting to be installed next week along with doing the FPD MOD. I will tell you if this has solved the problem. Or else we need a S-AFC like terry said. Quote Link to comment Share on other sites More sharing options...
randy Posted September 19, 2002 Share Posted September 19, 2002 Originally posted by Nic I can not find any information about the brand Randy mentioned. Randy if you have a web address for the company let me know and I'll see if my local place can give me a cost. BTW Randy I'll get back to you this weekend with some info. Yes guys its available with Takakaira- go to the web page click perfromance parts then on the right you see all the companies where POWER is click and go to injectors. There in the table you will see before M/C AND After M/C which is basically related to the 93.5-97 which came with side feed then the 98+ maybe the VVT-i engines with Top feed. http://www.takakaira.com/ Quote Link to comment Share on other sites More sharing options...
Matt Harwood Posted September 19, 2002 Share Posted September 19, 2002 Originally posted by GavinL I think my 2nd comes on at about 4200. Interesting effect your FMIC has had on your car, I have never heard of that before At first, I though I'd overlooked a hose or not tightened something up. It also idles differently. It used to cold start at 1100, now it cold starts at just over 1200. Once warmed up it used to idle at 750-800, now it's at 600-650 It doesn't drive any differently. I can't use full throttle yet so I dont even know if it goes any better It does run a lower EGT at a constant speed though Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 19, 2002 Share Posted September 19, 2002 Had a look. Can't see any that fit the 2JZ rail? Quote Link to comment Share on other sites More sharing options...
Nic Posted September 19, 2002 Share Posted September 19, 2002 Found the website (http://www.power-enterprise.co.jp/exp/inj_pomp/inj_pump.htm), I'll see if the shop I use can source these. Quote Link to comment Share on other sites More sharing options...
Guest Terry S Posted September 19, 2002 Share Posted September 19, 2002 I stand corrected. Their site show 650's & 800's both for 15,000 Yen, side feed. £80 each + shipping etc. Quote Link to comment Share on other sites More sharing options...
randy Posted September 19, 2002 Share Posted September 19, 2002 Originally posted by Terry Saunders Had a look. Can't see any that fit the 2JZ rail? It says 1JZ(******)2 means both 1 and 2JZ! Quote Link to comment Share on other sites More sharing options...
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