Breadman Posted March 31 Author Posted March 31 To progress further with the engine tuning, I need to finish the bike enough so I can ride it down the road. BRAKES....... I need them so I stripped down the rear brake that I had and it was useless. More £££££ Quote
Breadman Posted March 31 Author Posted March 31 New parts ordered and everything reassembled and then I decided to fit the thumb brake that I have from another project. It looks weird mounted on the handlebars and my one picture doesn't really help but with new homemade stainless brake lines, new fluid and it works very well. There is a surprising amount of feel when you push the lever and I actually think that it will be easier for me to handle any wheelies. Quote
Breadman Posted March 31 Author Posted March 31 I have not fitted the rear brake pedal or master cylinder so lets hope it does its job. Quote
Breadman Posted March 31 Author Posted March 31 Despite my efforts of trying to tune the bike, I noticed that the spark plug on Number 4 cylinder..........as you are sitting on the bike..........seemed to be a bit leaner than the other spark plugs. I swapped the plugs and coil packs around but the problem was the same. The Suzuki fuel injection system is mounted upside down from its normal GSXR600 orientation so the injectors are on top. Fuel was entering from the left hand side of the bike and then exiting out of the original fitting, between 3 and 4 cylinders. This fitting was actually the original Suzuki INLET . I have circled this in the photo. Quote
Breadman Posted March 31 Author Posted March 31 Despite the fuel rail being pressurized @ 3 bar, was the fuel taking the path of least resistance ?????? I have now swapped the fuel pipes over so the inlet is as Mr Suzuki intended. If the problem persists, I will blank off the original Suzuki inlet and just feed the fuel in and out of the main fuel rail. Quote
peter1127 Posted April 2 Posted April 2 On 3/31/2024 at 10:06 PM, Breadman said: Despite my efforts of trying to tune the bike, I noticed that the spark plug on Number 4 cylinder..........as you are sitting on the bike..........seemed to be a bit leaner than the other spark plugs. I swapped the plugs and coil packs around but the problem was the same. The Suzuki fuel injection system is mounted upside down from its normal GSXR600 orientation so the injectors are on top. Fuel was entering from the left hand side of the bike and then exiting out of the original fitting, between 3 and 4 cylinders. This fitting was actually the original Suzuki INLET . I have circled this in the photo. In and out at the end of the rail seems a better solution to me, so basically as your picture but at both ends. 1 Quote
Arttu Posted April 2 Posted April 2 On 3/31/2024 at 11:13 PM, Breadman said: Despite the fuel rail being pressurized @ 3 bar, was the fuel taking the path of least resistance ?????? I have now swapped the fuel pipes over so the inlet is as Mr Suzuki intended. If the problem persists, I will blank off the original Suzuki inlet and just feed the fuel in and out of the main fuel rail. I would first try swapping the injectors to see if it's injector related issue. But yes, it's possible that your fuel rail layout can affect too, especially on idle and low load. 1 Quote
Gixer1460 Posted April 2 Posted April 2 On 3/31/2024 at 9:13 PM, Breadman said: Despite the fuel rail being pressurized @ 3 bar, was the fuel taking the path of least resistance ?????? I have now swapped the fuel pipes over so the inlet is as Mr Suzuki intended. If the problem persists, I will blank off the original Suzuki inlet and just feed the fuel in and out of the main fuel rail. I assume that there is a FPR somewhere? 'Most' installs have the regulator after the injectors - at the rail outlet or soon after. This negates the 'path of least resistance' thought as the whole rail will be at pressure, at all times. If fuel exits, say, between 3 & 4, the pressure will be the same but fuel 'may' stagnate as there is no flow past it - although the effect should be minimal as it will be used and replaced through use. I have two rails with 8 injectors - in bottom left, loop from bottom to top on right, with FPR on outlet top left - no problems with differential flows or pressure over injectors. If one cylinder is persistently showing a lean condition it might be a dirty or sticky injector? A clean and flow test may be wise as its unlikely to 'get better' with use! 1 Quote
Breadman Posted April 2 Author Posted April 2 All good info. Thank you everyone. I will change the fuel rail and get rid of the Suzuki fitting and just have fuel coming in at one end and out at the other. Makes sense really. Will test the flow from all the injectors again. FPR is in the correct place but I will check, check and check everything again. Quote
Breadman Posted April 6 Author Posted April 6 I decided to drill and tap the other end of the fuel rail so fuel is in one end and straight out the other end. The original suzuki fuel fitting has been welded shut. Injector flow testing next week. 3 Quote
Breadman Posted April 11 Author Posted April 11 (edited) Fuel Injector testing this week and with the unmodified fuel rail, there was a significant lack of fuel on the right hand cylinder. After modification of the fuel rail, I now have a very steady flow across all injectors. I even moved the injectors across to different cylinders and everything still seems ok. In other news, the front brakes are proving to be a pain to bleed so it's a cable tie around the lever and I will return to that next week. I have to remove the swinging arm again as I'm not happy with the clearance between the frame and chain. I have a better condition chain guide rubber so it is a good time to fit that. The bandit swinging arm in the Gsxr frame gives a shorter wheelbase and I have also got a smaller rear sprocket. This means the chain runs much closer to the swinging arm so a better condition chain guide is a good idea. The brembo clutch master cylinder looked good on the outside, but the piston and seals needed replacement. New parts ordered and yet another job for next week. The blue petrol tank in the previous pictures has no mounting lugs for the frame and side panels. I have another petrol tank which I will fit but I need to weld new fuel line fittings to it. Next week will be busy and the good weather is coming so there is much to do. Another set back happened today........the fuel pump I was given has now starting to make a nasty grinding sound. The fuel tank has plenty of fuel so it's not air causing cavitation. A new pump has been ordered. I am fed up of delays caused by secondhand parts. Saving money is good. Messing around fixing stuff is bad. I also checked the fuel filter but all looks good and clean. ?? Edited April 11 by Breadman 1 Quote
GSX1100dreamn Posted April 12 Posted April 12 (edited) Personally if that is your pump pre filter, It would be suspect through design that it can cause aeration of the fuel going into it. I prefer the factory (sock type, internal pump type)( external pump, a length of hose 3/8'' or 10mm before the pump and a little cartridge filter) as a pre filter to EFI pumps or something similar and more so a void/ space area before the inlet for suction. But thats me. I had a sintered type like above in a clear hosing and saw this aeration post filter. Happy pioneering. Cheers Andrew. Edited April 12 by GSX1100dreamn Added info 1 Quote
Breadman Posted April 12 Author Posted April 12 Fuel filter info noted. Cheers. Front brakes have come to life overnight. And managed to weld some fuel line fittings onto the tank. Quote
Breadman Posted May 17 Author Posted May 17 (edited) 15 months have passed since I started this build. In that time, I have spent over 120 days assembling the bike. Some things have worked, other things have broken. Alot of things have just confused me because I have no idea of what I was doing. And I am still struggling with problems. A new fuel pump and modifying the fuel rail have gotten rid of my fuel issues. Fitting a Bandit swinging arm into the Slingshot frame was easy but problems have occurred due to chain clearance with the frame. The chain was also contacting the swinging arm where it bolts to the frame as well. I have also fitted longer dog bones to the rear suspension and a 17T front sprocket and the 50T rear but at least everything works correctly now. The rear shock absorber had a crack in one of the mounts and this broke when I tightened the mounting bolt. I ordered a new part and then had to strip the shocker down to fit it. More time wasted. The picture was taken when I was sat on the bike so you can see why I had to change things Edited May 18 by Breadman 1 Quote
Breadman Posted May 17 Author Posted May 17 Today was great as it now rolled along with no issues. A nice warm day in England and it was time to push the bike outside and start again at getting a fuel map into the ECU. The bike fired up nicely and then just stopped. The overboost had kicked in and this cuts the fuel to the motor. BUT WHY ?????. Two hours were spent checking wiring, voltages and air fittings until the motor started again. The pins on the Bosch MAP sensor are very, very small and I can only assume this was the problem so after cleaning, yet another problem was solved. Next week, I can connect the gear linkage, put some fluid in the hydraulic clutch and I should be able to take her down the road. The Autotune function on the MS2 will hopefully help me with the fuel mapping. With its paintwork of many colours and the white and black side panels waiting to be fitted...........I am happy with its progress and the ugly appearance. 5 Quote
Breadman Posted May 23 Author Posted May 23 First shakedown ride today. Nothing fell off or rattled loose and it didn't puke any oil. Strapped the laptop to the tank and will do some tuning on the road tomorrow. English weather permitting. 5 Quote
peter1127 Posted May 23 Posted May 23 nice! No leaking or smoking and running is a good start! (assuming there is actually oil in the engine ) Did the same with the laptop, only ducttape because straps allowed too much movement at speed 1 Quote
Breadman Posted May 24 Author Posted May 24 The sun was shining today and the first ride out using the Megasquirt Autotune feature proved to be interesting. I locked out the idle fuel settings so autotune can't adjust them. Whilst they are not 100% perfect, they work ok. Felt very strange riding along with a laptop on the tank but it seems a better idea than putting it in a bag or rucksack. I decided to use the same roads for this initial testing to help with consistency. Lesson 1......make sure you have enough fuel in the tank or the bike will start cutting out. The bike is not legal yet so stopping on the side of the road was not good. Managed to limp back to the workshop. The data I got was rubbish and I did not save it to the ecu. Put more fuel in the tank. The second journey was better and you could feel that the autotune was doing its thing so saved this fuel map to the ecu. The third journey seemed very similar to the last. There is a fuel table smoothing facility but I forget to use it. This removes the peaks and troughs in the fuel map. Maybe that could have helped ? I don't know so will just have to remember next time. Overall, I am happy and looking forward to more testing. I hit boost momentarily but lets get the fuel map sorted lower in the rev range first. And still nothing has broken or fallen off. Thanks to all of you who have given help and advice to get me this far. 5 Quote
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