Hi, I am planning an engine rebuild at some point and was wondering in your experience are the 175 dci M9R engine internal strong enough to gain more power or should i go for forged internals? In term of power i was thinking of 250bhp or am i being unrealistic? Many thanks
I would be amazed to see the need of rebuilding the M9R. The only things you need to do is a clutch upgrade, intake clean of soot and glow plugs change. With a turbo change, you can hit 250hp quite easy. My current hibrid I recon can deliver 260-270hp if pushed to the max. Let me know what plans you have with yours. S. Sent from my E6653 using Tapatalk
I have a Dci 175 engine in my Espace, it's done 160k miles and feels like it would do it again and again after that, it was remapped after the DPF removal @ 110k miles, it's running about 200 hp, there was a massive improvement in the torque, i can't imagine what 270 hp and all that diesel torque in a Megane would be like, perhaps i should keep my low mileage Dci megane and give it a go .
well the things is the timing chain is noisy and clunky, it was like that when i bought the car with 36000miles on the clock 5 years ago, i have now 145000 miles i guess it was poorly looked after and driven hard from cold. So while i need to remove engine to change timing chain (unless somebody know an easier way) i thought i would recondition it and put a fresh engine back in with a good remap. the gearbox bearing for the 6th gear is noisy under load so that need a refurb too, probably going to use Agency Transmissions in worcester, people seems to rate them on CS.net What kind of hybrid have you got on yours. not sure how to get one or do one.
Hello, I never looked into how to change the timing chain, but something tells me you should do it on the car as well. If you want, I can look a little more into it. I'm not sure what do you mean with reconditioning of the engine because if you plan to fit new pistons and rebore the block, I think we will make things worse rather than better. I would start with a compression and leakage test and if those look good, I would not open the engine more then needed. A good intake clean will never harm, that's for sure, but once you do that, you should also do a EGR off and a catch-tank in order to keep everything clean. Gearbox bearing is one the first things I've done to my car and it seems is a common fault. I used the same moment to change my clutch and install an uprated one (self-made) and also a LSD. I wasn't brave enough to go to a single mass flywheel but it seems my dual mass is still running well. The problem this gearbox has is linked to the way it oils the gears, just by moving oil around. Next level would be to install an oil cooler and oil pump which will also throw the oil on the gears better. But that is a little too hardcore for a street car. Regarding turbocharger, I believe it depends a lot what you want do achieve and how much spool do you want to trade for top-end power. In my case, i wanted to move the power higher up the rev range, as a torque monster would never offer anything good in terms of track driving. So I went for a fairly big hybrid. But there are so many different tunes you can play with this. Regarding getting a hybrid, there are some places in UK which are doing generic hybrids (none specialised on Renault turbos) or I can even help you with the same route I went on. But knowing exactly what you want is the key. S.
To change the timing chain is a pretty easy job with the engine out, it only runs on one cam and the other is geared off of that one, the seal in the cover often leaks and guess what, yes it's Renault only and i think it's about £35, there is no gasket on the cover so you need some sealer to refit, just take it easy when trying to get the cover off it's some proper strong stuff Renault used.
thanks for this, a compression test is a good idea, i guess i could do it with the glow plug remove. What about tappets and valves assemblies? Anyway my idea was new piston ring, reconditioned the head with a skim and a good clean and new headgasket, new valves, valve spring, actuators, new timing chain, new seals all around especially on the crank, and use a laguna turbo, new reconditioned 250 gearbox maybe with an LSD if i can find one cheap, new clutch, new DMF, while i am at it i want to sort a cold air intake in the wheel arch maybe but keep the same air filter box, (currently have K&N filter) EGR and intake clean just been done after i had the Injection/Emission Fault on the dash 3 weeks ago. I do service my car every 6000 miles to keep it clean and sweet and well oiled, gearbox been serviced 1 year ago. Fitted full renault sport suspension at the front including swivel hub with RS175 cup shocks, H&R springs. All in all, what i want is a bit more torque to improve the 0-60 but also more available power higher in the rev. as i find that after 3,5 to 4k rev even in 5th their is nothing left and quickly reach a ceiling, then it is 6th gear with not a lot of torque to pull the car quickly enough to compete with more modern diesel car.
I will take it in order. If compression and leak-down are fine, then you don't need to change rings. If you don't take the head down, you don't need a skim or a headgasket. If leak-down is fine, you can also safely assume your valves are not leaking, so no need of valves either. I would say nor springs either. I would go on the idea of don't mess with it if it works. Regarding gearbox, you need to keep in mind that 250 has different gear ratios and definitely different final drive. What I've done was to fit a 250 LSD in my gearbox when I refurbished. Regarding clutch, don't fit a stock one as it will not hold too much torque. At least a heavy-duty relining is needed (can help you with this if needed). Laguna turbo is a good starting point but you need at least a different compressor wheel to get close to 250hp. Main reason why stock 175 feels like hitting a wall when you go higher in rpm is the exhaust back-pressure you hit due to the small turbine we run (GT15) I can sell you a 250 gearbox without LSD if you need. S. Sent from my E6653 using Tapatalk
So from what you say i would need a bigger exhaust to reduce back pressure. is that right. Agreed if compression are good leave the engine alone. No gearbox from 250 was only to get a LSD, but i guess if i went from a 175 gearbox pk4-013 as a start point (mine is a PK4-001) that would be a bonus. My only concern with the PK4 gear box is it was developped by renault to take 400Nm max (see attached brochure) so can it be reinforced to take more i.e. stronger synchro and bearings? http://www.powertrain.renault.com/a...hure_bv_new/Brochure_BVM_PF6_PK4_MAJ_2014.pdf I believe you are based in stratford right. So when we sort a meet soon i hope we can chat about it further. Where can you find a clutch that will take up to 500nm torque?
I also found this https://www.sachsperformance.com/en...rmance-clutch/renault-megane-ii/2-0-dci-110kw
just bought a PK4-13 gearbox, will do a full refurb of it, just need some Megane 175 driveshafts now...
I haven't paid the money to Sachs. Not very sure how different is compared with the normal clutch. I found a company here in UK and I relined my clutch disc with the most tough organic material they managed to offer. Still looking for a higher clamping plate or a way to modify a plate for this. Currently I need to control the torque at 1750-2000 and limit it around 550Nm but I think is enough anyway. If you plan to install a LSD aswell, I think you would need to do some further mods as it is pretty weak. I plan to do this next time I take the gearbox out. Happy to discuss about this. S. Sent from my E6653 using Tapatalk
Good go see more dci chat. Just had mine done (sorry Bulardas but couldn't wait). DPF + EGR delete plus map. 158bhp/340Nm before and 194bhp/412Nm afterwards. Results on paper and for real agree with your points. Loses lots of torque after 4500rpm. Slow in sixth. Pulls well in fourth!! Should I be concerned about the box based on that torque? Best way to clean intake? Best panel filter? Catch tank? RS 175 Cup Lux
