gtstii

after a bit of further research, I've decided that the Walbro's aren't bad but I might go for a bosch in the end. After all the advice I have received, I'm now thinking of going for a Bosch 040 pump. The reason for this is that this is one of only 2 Bosch pumps which are designed as in tank pumps as i said earlier. Bosch and a couple of other people don't recommend using their other (external) pumps internally and I have heard of a few people having very noisy bosch pumps. If you have a look at bosch's efi tech catalogue on their site, it states (and I quote): Title: Noisy External Fuel Pumps "Many fuel pump noise issues are relates to cavitation caused by insufficient fuel flow to the pump from the fuel tank. Keep in mind that external "Roller Cell" design fuel pumps are not designed to "draw" fuel from the tank. Vehicle design usually ensures that either the fuel pump is mounted low enough to be gravity fed, or a "Pre-Pump" or "Lift Pump" is fitted into the fuel tank of the vehicle. When a fuel pump is to be replaced it is important to ensure adequate supply of fuel to the main pump exists. Details on how to check this is detailed in the article "EFI Fuel Pressure Testing Procedures" Important Note - Fuel Pumps that fail due to cavitation/fuel starvation caused by insufficient clean fuel supply are not covered by Bosch warranty" (catalogue found under: www.bosch.com.au, then follow the following links - automotive replacement parts and accesories - engine management components - technical articles, page 3) This ties in with recommendations made to me by Bosch when i spoke to them and also by a tuner in Melb. as I mentioned in a previous post above: (quote) "He also says that b/c these are external that they should have a small pre-pump supplying fuel to them at pressure instead of having to suck up their own fuel in the tank" Again, I don't pretend to be an expert, I'm just trying to put out there all of the info i've been told, if you dont agree - let me know! More to think about!!

well, thats what I'm saying - I was told by petroject of the flow rates of the walbro's, even at a bit of pressure and did some research and found that table on www.autoperformanceengineering.com and it backed up what they said. these guys are good too cos they have service vans driving all around, all you have to do is call them and they deliver it straight to you

thanks for the advice JimX, I have read your post in the past and this is what first got me investigating. I have spoken to a few more people and heres what I've been told: - I know A LOT of people here fit bosch pumps in tank but Bosch have advised me that they recommend against this as all but two of the bosch pumps are designed to be external pumps (sydneykid: porsche/ferrari etc use them, but externally) You can look at the bosch motorsports catalogue by following the links on www.bosch.com.au and here you can see that the only two bosch pumps which are specified as interanl pumps are the 040 and the 023. I did a bit more research on the walbro pumps and the advantage of them is that they are new technology whereas most of the bosch pumps have been around for 20-30 years. The Walbro's have their own sound insulation and they are available in a size which fits straight into the std factory bracket, they are also specified as an in-tank pump! They come in 4 versions: 1. 190l/hr 2. 190l/hr (high pressure) 3. 250l/hr 4. 250l/hr (high pressure) Anyway, I was worried about their flow rate capacities under pressure and have been assured by petroject that the 250l/hr pump will still flow 220l/hr at 2.5 bar which will be heaps for my application. I then did my own research and found a site that has a table of all the walbro pump flow rates at diff. pressures (in gal/hr) I converted this to l/hr and found that the 250l/hr high pressure walbro pumpseems to have heaps of capacity at all sorts of pressure (even when compared to the bosch flow rates) check out this site for the walbro pump table: http://www.autoperformanceengineering.com/ (click on fuel pumps - in tank) Remember: This is all from advice I have been given by a number of different sources!

can some (or one) of you guys who bought a bosch 910 pump, let me know if the pump is very loud! .....I know it's gonna be louder than standard but I don't want it if it's going to be annoyingly loud!

how loud is it and how much power will an 040 support?

thanks man............ and are the 975's in the porsches in tank?

thanks heaps - should be ok, my car sits in a garage and is always kept well clean / polished so the orig paint is in good condition except for a few scratches here!

I've got a copy of the manual but it just tells you how to set up the knock sensor settings but does not mention the knock levels at all! What is considered a knock on a power fc's output!

ummmmmm, my car is black - is that bad then?

I just dont know what the "scale" is - what level signifies a knock??? would it be the same as a power fc's output seeing as they are both apexi?

If I need to get my rear quarter panel sprayed to get rid of some scratches, I was wondering how this is done. Because of the design of the r33's (and all skylines) there is not actual join where the spray can stop cos the panel continues onto the roof and all over to the oher side of the car. How is this done, would they stop somewhere and try to "blend" it into the orig paint? Has anyone had this done? If so, how does it look? Surely this doesn't mean tht half of the car needs to be sprayed to fix one quarter Panel!!!??

sorry guys, but I also say the S15!! (or an r34 gtt)

SAFCII's also have a knock sensor. Lately on hot days my readings sit on around 30 and reduce when I accelerate to close to b/w 0-10. On cool days and at night, reading sit under 10 and will go to 0 under WOT!

Would I be right in thinking the following: People who have an SAFC in their cars and are running more boost and so on.... but do not have any timing control (ie. power FC, emanage etc..), might be losing a bit of power in the midrange because they cant optimise their timing, but isnt this sort of set up a lot less prone to knocking? Your A/F ratios are tuned with the SAFC but imagine you are driving on a really hot day on crap fuel with a load condition not experienced on your dyno runs, then your car may sense from the knock sensor that you might have a bit of knocking - the ecu will retard your timing to prevent this and yes, you may lose a bit of power but you will be SAFE! If you are running your car and there is no knocking, then your ecu wont retard your timing and you wont lose any power It may not be 100% optimised, but isn't this a lot safer? Does the fact that your ECU senses knocking and deals with it mean that it is very unlikely to happen?

I cant help you with all of these but i would say that it is easier to disconnect the dump at the turbo and get it out of the way. I've done this before and it's very easy, I didn't have the heat shield so it took about half an hour working slowly!

thanks a lot for that - always helpful ! I have been trying to select a fuel pump for the past week and need something for 200rwkw, so will select something which can support up to around 250rwkw to allow for future mods. The thing is, I have spoken to a few diff. places and have been getting SOOOOOOOOOOOOO much different info, here goes (long one): - I like the Walbro pumps because they are quieter, smaller and cheaper but I have read on SAU that their flow rates are specified at 0 pressure and that they do not actually support 500Hp. Then a couple of tuners have told me that they sell walbro 500hp pumps by the truckload and haven't had problems with them! - A bosch pump sounds like a good, reliable option but I know that they are noisier and require a bit of stuffing around to fit. I would look at something like a bosch 910 or 975 and wanted it to be fit in the tank and this is done/recommended by a few tuners but then a tuner in Melb. told me that they wouldn't do this as these pumps are designed as external pumps and he wouldn't "risk" putting them in the tank. He also says that b/c these are external that they should have a small pre-pump supplying fuel to them at pressure instead of having to suck up their own fuel in the tank. Also, bosch did not recommend installing them in tank b/c they are too big. - I spoke to Petroject's Melbourne office(www.petroject.com.au) and they recommend a pump which they have picked especially for use in skylines and wrx's. He says that the bosch pumps require too much stuffing around to fit and that they have a pump which has a 50mm OD and fits straight into the std bracket and is a high flow unit that will flow 220l/hr (@2.5bar) for $305 - but it isn't a brand name pump, in fact he told me that the pump has no brand? :confused: Can anyone shed some light on this!! :confused: I need help to decide

hey all, just a quick tech question: if you select an aftrmarket fuel pump for your car which flows much more than you need, I realise that this wont make the A/F ratio any richer cos it's controlled by the pressure reg. but I've heard that you can have problems with the fuel having to keep recirculating back to the tank as the pump supplies more than is needed and that this can cause the fuel to heat up? is this true??

jam factory is good but Anderson is much better in my opinion cos it's newer doesn't get packed and has huge screens. ps. better not to sit in the balcony at anderson - it's too far away!

in my opinion, cinemas at casino are no good - too smalll! go to one of the newer ones like knox or in my opinion the new Anderson Cinemas in richmond are the best I have been to yet!

r34 cooler is a good bolt in - has worked well for me!

hey guys, have any of u who bought the bosch 910 pumps installed them yet? I needed to know if they are loud? Also, are the bosch 975 pumps much better? (I'm aiming for 190 - 200rwkws and was told to get a bosch 975 pump, but it only flows a little bit more than a 910 but is a lot more expensive, why is this?) sorry to hijack but any info is much appreciated. Thanks heaps!!

anyone know what the main difference is between the bosch 910 and bosch 975???

I needed to know what the main difference is between the bosch 910 and bosch 975??? they flow similar amounts but the 975 is a lot more expensive? Is it true that the 975 is just a newer model? Which is better??? Which would be quieter??? thanks

i dont know the technicalities of it but i had a squeaky clutch also and it wasn't the pedal. I had my car at nissan for a service and asked them to look at it. They said it was a known problem and somehow adjusted it and got rid of the sqeak and did it for no charge. sorry for being so vague!

If smItLeR doesn't take the 910, I'm interested - can you let me know. ps. I'm in melbourne