El Gringo

Thanks for the reply chap I presume to get 2psi at the FPR you need to modify the spring a bit? I'm actuely aware of how fickle the GSXR4 carbs can be so anything i can do to make life easy for them the better. I was chatting to Ben at Valespeed about my project and his trip to Pendine the other day and he said you were the person to speak to.

Hi All, Things are progressing nicely, have made a start on the turbo stuff! I have the turbo and have made a start on the headers. Turns out the oil cooler and filter aren't going to be an issue as the turbo sits well above them which is nice, so i can run a stock filter and the stock cooler, an have enough space to change to a sandwich plate take off and air/oil cooler at a later date with no hassle, which is nice. I think i've sorted the oil feed and probably return but my next question is regarding the fuel pump etc I was going to run the Malpassi FPR009 that everyone seems to use, but i'm a bit unsure on the pump. I've been looking at the stock replacement Bosch 070 type pumps on egay, which are 3 Bar (44psi at 12V) and 130 litres per hour. http://www.Eblag.co.uk/itm/161152185189?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT Am i correct in thinking, that i need to maintain 3-5psi above boost pressure? So for example if i run 15 psi of boost i need a pump capable of 18-20psi? My concern was whether the 44psi/3 Bar was too much, although the FPR is rated to 60psi from a bit of research, would that be ok? Secondly on the tank flow/return, i presume the return needs to feed back at the top above the level of the fuel? Apologies for all the questions, i think i'm getting my head round it now! Cheers

Thanks boss,

Crackin' thanks for the info Slingy. I assume you've had no issues with filtration? I'm going to start with a standard filter straight on the block and do away with the cooler, but at a later date i'll use a s/w plate cooler take off and a short filter with the adapter.

Thanks guys, have given it a bit more thought, i think i'll find a better radiator as a first port of call. I was going to swap from the GSXR4 rad to a Bandit4 rad which is slightly shorter which would give better clearance for the headers but i really need more performance than less by the look of it. At somepoint i'll look at a sandwich plate for a remote oil cooler, this would save me approx 30mm compared to the standard cooler. If i could convert to M20 x 1.5 i could also run a shorter filter - do you have any details of your super short filter Slingy? The bonus of using the sandwich plate adapter means i could run the oil pressure switch from there and not have to faff trying to tap the end of the turbo feed banjo bolt and I could run oil temp from there too. My original plan was to buy the oil filter stub from a B12 so i could run the filter on the front of the block - which I may still do in the short term as its about £6 + postage I suppose the ideal would be to replicate that stub but with M20x1.5 on the filter end, use a standard sandwich plate off of eGay, and then run a shorter filter. Thanks for all your help, i'm sure i'll be back with more daft questions shortly! Cheers Chris

Bit more progress, none turbo related i'm afraid Still looking at the pipework sizes, got the air and exhaust side of it sorted but i'm still wondering about the oil feed and drain sizes? I presume as big as possible on the drain to take the oil away - will need a scavenge pump, probably the 12V facet one, but i might have a go at a mechanical one drven from the timing plug hole on the right hand crankcase. Had a look at PaulM's bike at Stoneleigh the other week, the oil feed looked roughly the same size as brakeline, which i think is -3? The GT1544 i was looking to use is Journal turbo rather than Ball Bearing, would i still need to run a restrictor or is it only BB turbos that need less oil flow/pressure? My other issue is still going to be lack of space at the front due to the sandwich plate oil cooler, I can get the standard oil cooled motor filter threaded part and do away with the oil cooler entirely but i'm guessing that will no oil cooling and a turbo it's going to run very hot and kill the oil very quickly. I wondered if i could make an adapter plate to replace the sandwich cooler and use a remote oil cooler in front of the normal rad. If i make the adapter plate narrower than the cooler plate I can gain back around 30mm. Also, anyone know of an alternative to the standard Suzuki spin on filter that is shorter, this might help gain a bit more back. Anyway, progress on the subframe and tail unit Cheers Chris

Hi All Made a bit of progess on this, rolling chassis is pretty much complete, now starting to think about the turbo bits. Couple of questions. On the GSXR4 theres a sandwich plate oil cooler behind the filter, this pushes the filter out infront on the frame cross member below the exhaust ports - i get the feeling that it means the filter is going to be right in the way of the turbo - I realise that Turbo bikes are hard on oil and oil temps but could i do away with it and just run the filter on the front of the block, like an oil cooled lump? I've searched for a shorter oil filter but can't find one. Secondly, the only point to pull an oil feed for the turbo is the threaded fitting the oil pressure switch is fitted to on the front of the sump. My plan is to replace the threaded boss with and banjo and banjo bolt thats threaded to take the pressure switch - this way the switch still sees pressure but allows me to run a line to the turbo. Thirdly, on the turbo oil feed, what size line would be appropriate? Having looked at some of the other threads i think this will need a restrictor, which i was thinking could go in the banjo bolt after the pressure switch. Any pointers greatfully appreciated This is how far i've got Oil filter/cooler and feed point for the turbo? Cheers Chris

To be honest i'm trying to minimise costs initially as it only an experiment first time round. If it works, and i see no reason why it shouldn't, i'll expand in version 2.0 I've plotted a 1544 map up to 20PSI and it does give a bit more head room at 11,000 rpm, plus the flanges are a bit bigger which may make package the header a bit easier. I've just gathering the parts for an initial rolling chassis build, so the turbo bit will be a while on yet

Fantastic!, I like the sound of that! Thanks again for your help, i'll plot a 1544 map and see what it looks like. Cost wise the 1241 and 1544 are broadly similar although there appear to be a few more 1544's knocking about

Many Thanks again Mr1460! Just so i understand, when you say on the limit, could you expand a little please? As in it'll potentially run out of puff at the 11,000rpm, so effectively spinning generating heat but not giving anymore power. Apologies for all the questions and thank you very much for your help!

Thanks Mr 1460 So that's the FPR seeing a boost signal from the plenum rather than a vacuum from the carbs? Which makes far more sense than how i've got it there! I've also got a couple of compressor maps with some points hand plotted, i think i know which is the better one but could I be cheeky and ask someone to cast an eye over them please? It's abit of a left field bike choice - GSXR400 and i'm aiming for approx 100bhp I knows it's probably a pointless endeavour but i fancy a go at it and it was cheap Options as far as i can see are a GT1241, which i think is the better option with more room for further power, or an RHB31 VZ21 which I think is a bit small Cheers Again Chris

Afternoon All Haven't been around on here much recently but i'm loving the fact it's all back up and spinning again! I've been doing a bit of research into the in's and out's of turbos and i'm struggling to get my head round where the various pipes should go and where to take feeds from etc. I've had the old turbo layout picture from the old site saved for ages which i've modified to what i think it should be, just wondered if one of you guys could sense check it for me please? I'm aiming for a very basic blow through setup (ignore the intercooler bit) Any pointers would be much appreciated Cheers Chris

Thanks Guys, i'm hoping I might actually get it MOT'd and ride it sometime this year. I think it'll need a bit of setting up once it's on the road but i'm looking forward to it.

Cheers Davy, that's a nice looking bike! Just looking at the BHP thread, i'm sure mine should be making more than 148 with all the bits that were done to it. It had 1216 pistons, skimmed, ported and devcon'd head, piper cams, full 4-2-1 akra system, dyna coils, RS38s, HD studs, Nuts and Valve Springs and 1.5mm oversized inlet valves. I'm thinking i might swap back to a sensible exhaust and have another go at setting it up properly.

Cheers Guys, Yeah just added the bottom rail in to make it a bit mag4 ish. Its as close to a Harris as i'm likely to get but i'm pretty pleased with it

Afternoon All, I know it a w/c Bandit and its only a 400 but i'm quite proud of this, hopefully it'll be different enough to escape the chop Started off as a ropey £300 nail of fleabay and ended up as below Cheers Chris

Afternoon All, Its good to be back! Thought i'd stick a few piccys up of my 1216'd L, Was about 148 brake and 88ft.lb but i never got round to setting it up correctly - its been languishing in the shed for a few years now, I should really have a nother go at it. Cheers Chris