My car (renault 5 GT Turbo) is currently going under a major engine change, im putting in a Clio 16v lump and having a turbo conversion on it. I have been told that a clio 172 gearbox will fit in the car but is this going to be capable of having around 400bhp go through it or is it going to smash to pieces? not going to run all the time though, something to do with fuel tax's. But I will also be after an LSD for it, wheres the best place for this? Any ideas on what other gearboxes might fit on which will be able to cope and price wise. Cheers
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It will if you spend the money on it otherwsie nope. I'd never both trying to stick that much power in a JC5 get a box which is better built to start with.
Forget the whole 16V lump but a VAG 1.8 T engine and box and use that much better option or least use a turbo F$RT engine block and box to start with as there stronger (box isn't that little though).
Forget the whole 16V lump but a VAG 1.8 T engine and box and use that much better option or least use a turbo F$RT engine block and box to start with as there stronger (box isn't that little though).
stevo172-RWD
ClioSport Club Member
clio 172 rwd
400! lol dont be daft!
the jc5 cant handle standrd power!
the jc5 cant handle standrd power!
Everything is pretty much done to the engine now and waiting to go in the car
Spec:
1.8 16v from a renault 19
Megane head, ported and polished with enlarged valves
Turbo Exhaust manifold constructed from a high nickel content
Samco silicon hoses
magnecor KV85 leads
2 1/2" side exit exhaust
BB R-tuner mapable ecu
high pressure fuel pump
550cc injectors
GT28RS "disco Potato" turbo
Custom TT 2 1/2" v-band downpipe
Paddle clutch
Wossner 7.5:1 forged piston
Bored out to 2litre
full bottom end blueprint build
fully lightened and balanced bottom end with all parts replaced for new where needed
adjustable FPR
Baffled Sump
Semi Seam Welded Subframe
this will then run over 20 psi when i feel like it lol
The VAG engine is a good choice to go for but buying one in the first place would have been more expensive, seeming that you can pick up the renault 19 from as little as 300 quid.
The torque will be in excess of 300 easily, so that gearbox wont be a good idea then, thats why i need ideas to go for.
The cost of Sadev gearboxes is a bit high. id rather destroy a 172 box every couple of months than buy one of those. it will still be a cheaper route doing that over a couple of years. Any options of strengthening the gearboxes? Some of you most be running more than 240nm of torque, what gearboxes do you use?
Spec:
1.8 16v from a renault 19
Megane head, ported and polished with enlarged valves
Turbo Exhaust manifold constructed from a high nickel content
Samco silicon hoses
magnecor KV85 leads
2 1/2" side exit exhaust
BB R-tuner mapable ecu
high pressure fuel pump
550cc injectors
GT28RS "disco Potato" turbo
Custom TT 2 1/2" v-band downpipe
Paddle clutch
Wossner 7.5:1 forged piston
Bored out to 2litre
full bottom end blueprint build
fully lightened and balanced bottom end with all parts replaced for new where needed
adjustable FPR
Baffled Sump
Semi Seam Welded Subframe
this will then run over 20 psi when i feel like it lol
The VAG engine is a good choice to go for but buying one in the first place would have been more expensive, seeming that you can pick up the renault 19 from as little as 300 quid.
The torque will be in excess of 300 easily, so that gearbox wont be a good idea then, thats why i need ideas to go for.
The cost of Sadev gearboxes is a bit high. id rather destroy a 172 box every couple of months than buy one of those. it will still be a cheaper route doing that over a couple of years. Any options of strengthening the gearboxes? Some of you most be running more than 240nm of torque, what gearboxes do you use?
oo dear, not looking good on the gearbox side, need to find a gearbox first though, ill sort out a wanted post, but they seem hard to come across, and just missed out on one in ebay becuase i wasn't checking everyday 
When your talking about why not use the 2.0 bottom end, i guess from the williams engine, one they aren't easy to find cheaply, and also i got told they dont rev so nicely as the F7P engine. Least I have a while to find everything i need as car is not completed fully yet and i still need to run the engine in, but im sure that wont take too long if the weather is nice.
When your talking about why not use the 2.0 bottom end, i guess from the williams engine, one they aren't easy to find cheaply, and also i got told they dont rev so nicely as the F7P engine. Least I have a while to find everything i need as car is not completed fully yet and i still need to run the engine in, but im sure that wont take too long if the weather is nice.
stevo172-RWD
ClioSport Club Member
clio 172 rwd
im running well over 200nm on the jc5 and mines ok so far lol!
allthough i have shattered a cast engine mount!
allthough i have shattered a cast engine mount!
the megane 225 box is even worse JC5 is made from moon cheese the PK6 is made from cream cheese
More serious note its not expensive to have it made stronger competition gearboxes shot peened by casing then a local firm rebuilt it with uprated gears and brand new synchros cost me a grand all in
More serious note its not expensive to have it made stronger competition gearboxes shot peened by casing then a local firm rebuilt it with uprated gears and brand new synchros cost me a grand all in
VAG j3C I think its called its the 6 speed one all the VAGs use 300LB offically rated to but even VW seem to allow upto 330lb under warently abroad (you can have foreigh models chipped) as they are more powerful than the offical calculation suggest. The diesel has the stonger bits in it apparently from some S4 or somehting box.Bigfoot said:
The Saab one is quite strong I guess its imilar to the Vlvo one as they both are used to 300lb torque.
Honda stuff is incredably stong BenR was on about 1000hp Hondas on almost stock boxes.
There a diesel sequenchal box out which holds a fair bit of offical torque 350lb or so from memory buts its £8k I think there other racing boxes though.
16v_jon said:
You got any more details on that? As i will be looking at changing the gear ratios this will be ideal time to get the gearbox fully strengthened. There is limited space in the 5 to get a gearbox in there, i believe the 172 box will just fit in but wont leave that much extra room to the side of it.
Anyone fitted a VAG j3C 6 speed gearbox onto a renault?
http://www.gearboxman.co.uk/ they'll sort most things out for youBigfoot said:
the VAG box will fit in the bay but you'll then need to chage the driveshafts or use custom jobs, build a mounting kit, change the clutch and depending if the chosen box is hydralic that too, paul jordan(01254 201681) is the guy you need to speak to regarding fitting VAG stuff and modding it
stan* said:
Actually Stan its more complicated than that. Lots of turboed bike powered machines have gearboxes and drive chains (and diffs in the case of bike-powered cars) that shouldn't be holding up but do. Because they don't have enough weight to generate enough traction that you can open up the throttle all the way in the lower gears without getting wheel spin. By the time you get up into a high enough gear that you can use full throttle the lower torque multiplication factor has reduced the loading enough that nothing breaks.
There's also evidence - I don't know whether the manufacturer admits it - that some BMW's ECUs are programmed to limit torque. It may be for component durability reasons. It was found when they dynoed them with higher octane fuels. They produced more power on the better fuel as would be expected with the knock sensor adjusting the timing to take advantage of it, but not more torque.
GordonD said:
Its not really anymore complicated than force breaks things!!
Its also likely that most Jap engineering is better than most we see on road cars...e.g out good old French 'boxs.
GordonD said:
For a given engine speed event?? That wouldnt be true. Increased ignition advance due to increased knock limits from the "better" fuel would raise the peak cylinder pressure. Its this increase in cyl pressure which does improve the specific torque output, and so increses power output.
80MPG BEEZA
16v_jon said:yeah but your first one needed oil to work
yes but i didnt know! i thought the load whining was just a characteristic until it kept jumping out of 5th! managed to egt 138mph out of it though before it completely went bang then £600 later it had a new box in
all is fine nowBENR! how long to get my inlets matched and mailed back to me? send them the 23rd need them back on car for the 11th? possible?
sorry for jacking the thread but reno gearbox's are poo end of story!
