Talking about Gearboxes...

Originally posted by renaulturbo:
[QB]J6R is the 2 litre atmo engine that came in all Fuego's imported to Australia. I say its same as J7R except for carbie vs turbo/injection of J7R. But im not sure of what internals they have in common. I predict that the J7R, being a turbo motor should have a stronger bottom end than the atmo J6R (dont know for sure) plus obviously compression for J7R has been reduced somehow.

J6R - 2.0 Fuego Oz spec, J7T R21 & R25 unleaded 2.2 Renix injection (V. nice) and the juicy one J7R 2.0 as fitted to R21 Turbo (especially yummy in Quadra format). All 2.0's are the same bottom end - just modified head for lower compression for turbo. 2.2 simply use a longer throw crank.
The best engine is to use the J7T 2.2 botton end, J7R turbo system, and the 12 valve head fitted to R21 TXI. Stupidly fast in a Fuego!!!! Might have to fit the R21 Quadra driveline to get the power down!!

Cant remember the link, but I've seen pics of a black Fuego in Germany with the J7R turbo fitted. Solves gearbox problem by fitting R21 Turbo gearbox - easy. If you have friends in Europe willing to send you an R21 turbo engine and gearbox, I'll beating on your door fot contacts!!
 
Oops, J7R is not the Turbo motor, its the 2.0 Renix injected one, fitted to series 1 R21, R25 gts, and probably Espace. Havent got my R21 manual with me, so not suer what Turbo designation is. The bloch on all versions is the same, so any one should be interchangeble with another - physically at least. Hooking up all the turbo and EFI hardware will be the fun bit!! R21 Turbo gearbox is essentially the same as other 5 speeds fitted behind the J series engines. Minor differences in strength i suspect. The Turbo in the R21 also uses a hydralic clutch to operate what must be a much higher clamp pressure.

Wonderful engine the J series - bullet proof. A testament to its strength is the J8S diesel - yep, a diesel head and pistons? on the same block. Explains all the ribbing and reinforcing on the block I guess.
 
Found it

<a href="http://home.t-online.de/home/Dieter.wedershoven/gallery9.htm" target="_blank">http://home.t-online.de/home/Dieter.wedershoven/gallery9.htm</a>

Yummy and inspiring. Check out the convertibles on this site.
 
Mad site! So it has been done before...geees, that 2L turbo looks the part under a Fuego bonnet. I plan to steal his 'fastest Fuego in the world' title tongue tongue wink

The turbo motor is designated J7R/752 or J7R/754 if i can remember correctly.

Thanks for the 12v head information. Thats one thing i hadnt found out, i had heard of a 12v head existing but i didnt know what model came out with it. I predict this head would have to be modified (for the compression) to run a turbo (?) Do you know what compression the 2.2 lire TXI has?

So how sure are you that internals (pistons, connecting rods, crank and bearings) are the same? I ask 'cos my piston rings are still goin strong (my engine uses no oil) so maybe i could build everything on my block.

What do you mean by throw crank? Isnt the 2.2 litre just a stroked 2 litre?

Cheers mate
 
R21 TXi is actually a 2.0 (140 BHP in standard form - as opposed to 120 BHP for 8 valve 2.0. 2.2 built for torque - around 125-130 BHP). Built in phase two R21 ( 1990 - 1993 i think). Turbo motor uses different pistons, gudgeon pins pivoting on the rod rather than the piston - or is it the other way around? 2.2 simply uses a longer throw crank with matching shorter con rods to stroke the engine - same bore.
Have a look at <a href="http://www.renault21turbo.com/" target="_blank">http://www.renault21turbo.com/</a>

These guys have all you want to know re. J series turbo engine. Among this crowd, the 12 valve turbo 2.2 creation is the one to have. (A great little bit of footage of a R21 turbo Quadra doing donuts on a frozen lake!!)

But I can't see any reson why you cant do it all with aussie bits - get J7T 2.2 Renix injected from a series 2 R21 or unleaded R25 and strap a Garret and an intercooler on it (easy with EFI)- essentially what renault did. And there are plenty of transmission specialist who can beef up the diff on a fuego gearbox. Fuego bellhousing has the provision for a hydralic clutch slave to be mounted for the beefed up clutch you will need. Been thinking about it myself for a while!!
 
I think i'd prefer to import the stuff though, it would make everything just that little bit more straight forward, especially since i now know that the R21 TXi has the 12v head and these were never imported to Oz were they? (Is the TXi the R21 that had the digital dash?)

If your gonna put the turbo on yourself well, youve gotta get a lot more done (custom manifold for turbo, compression has to be lowered). I thought about doing it myself (would be good training as i study engineering!) but i thought that the initial larger amount of money required to import the bits and pieces would be justified in the long run as more money would have to be thrown at the custom turbo setup to straighten the thing out.

The people at European Parts Imports in Box Hill are conjuring up parts to turbo their Peugeot Ute (has same engine as J6R). Im interested to see how that turns out!
 
Hey Renault turbo,
the only specs I could get close to(in my haynes manuals) with the J7R was the J7T/719. This was the 2.2litre (2165cc to be exact)

Now normally that wouldn't be very interesting- but- it also runs a very turbo friendly compression ratio- 8.7:1...... head_ban also similar cam timing to the 1565cc turbo motor (1565- 10/50, 2165-12/52) Wonder if the 2.2 appears in 25's?- no doubt it was probably the one that went to the states- as I heard it they choked them up with emission gear so ended up bumping the cuibc capacity to try and get some power out of them. Anyway- there is no substitute for cubes as they say.... (please no F..d or h....n remarks!) and if you could bolt the turbo setup to one of those well...
Just a thought anyhow..

Ben
 
Or for a truly outrageous Fuego, strap in a Mazda 13B turbo. Vast amounts of grunt, a whole lot of revs, and a lighter nose for more balanced handling. (plus with a nice exhaust, that rotary purr sounds great)
Asked a rotary workshop about it once, they reckoned it is as easy as pie to make up an adaptor plate and sep up a clutch - after that its just a matter of connecting pipework and electrical leads.
 
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