Well my 3.6 needs a rebuild and I'm tempted to try a 3.9. Any out there for sale?

 

I think Bara buys up a lot of second hand ones, have you tried some Toyota breakers.?

 

I've not tried anyone yet to be honest.
I'll speak to Bara as the 3.6 that's in the car will be going to him for a rebuild anyway along with my gearbox this winter.

 

He did my 3.9's

 

Theirs a guy on the Facebook cosworth parts page selling some if their still their 3.7''s and 3.9''s from what I've seen on here the 2wd boys go for the 3.7 better suited I think the ones on fb are up for 200 he had 2 of each will see if I can get a number and pm you

 

That would be great if you can find it

 

Hi mate got hold of him he's sold 2 didn't say which he's listing the other 2 on ebay I'd just keep an eye out for them

 

Cheers mate. I think I found him. He said he will let us know later this week.

 

 

I really think that lower geared and closer / shorter ratios make for better road cars.

My 330d has 8 speed auto with 750 rpm drop or less between gears, it would give most cars a good run for their money, the 205 gti is well documented as better in 1.6 than 1.9 and having owned both I agree, the difference, lower final drive. My 3.9 diff cossie with close ratio opppliger box is 100% better than my std ratio set up....I think mark Shead said that a 350bhp car on close ratio was quicker than any normal 500bhp car on the road.

 

I dunno about that last statement, that sounds a bit of an exaggeration....

Cheers Paul

 

For those with supra diffs there is a company in the states that offer a wide range of different ratio cwp's, worth a look if you fancy something inbetween....

Cheers Paul

 

www.weirperformance.com

I have one of their cwp kits in mine

Cheers Paul

 

I thought the same but my car on the Oppliger close ratio and 3.9 diffs feels like a totally different car to drive now, you will have to come and try it some time, It is amazing that you just keep chucking the next gear in there where as before you could really see the revs drop between gears.

I can see why Romain Oppliger is working on the 6 speed kit now though as the 5th is still wide compared to the other gears (although still shorter), with 5th being close to the other it would be even better.

I suspect the fact that I am on 16 inch wheels makes a difference as many fast cossies would be on 18's.

I rekon that if you went 3.9 and Oppliger close ratio on a standard car or T34 car you would be amazed by how much quicker it is due to the driveability and the fact that once the Turbo is spooled up you can keep it in the boost, my car used to drop off boost between each gear change on the T34.

 

I know what you mean mate, but surely that's just due to the lower gearing rather than the box.

I have a lower gearing in my sierra, makes a little bit of difference I guess

Cheers Paul

 

Dropping off boost on a t34!!!
Never heard most people say that?
Your not revving it enough ha ha

Cheers Paul

 

I felt that the T34 was very laggy to drive, you could floor it in second and rev it out, change to 3rd and then have to wait for the boost to build again.

My BMW has a twin scroll too and with the 8 speed box it just surfs along the torque and you really cannot tell it is a turbo car. I watched the torque meter this morning and the tell tale was pegged at 460 ftlb or torque.

 

Not being funny but that must of been some shoddy setup if it drove like that

Cheers Paul

 

I think it was typical of the age, l8 ecu and t34, running Ahmed chip and other people who knew Cossies didn't think it was anything different to their cars. The previous owner had it checked over by Mark Shead years ago. From what I have seen they are all pretty laggy compared to a modern setup. I am not talking galactic lag just obvious that it needed time to produce full boost. If you compare graphs you can see it plain enough.

Don't forget that i went from 3.6 diff to 3.9, then close ratio box too along with modern injectors, properly mapped vipec by Mark Shead with efr on twin scroll manifold, better intercooler and bigger exhaust all the way through with coil on plug and proper injectors. The car spec is night and day different and therefore drives like it too.

 

No turbo should drop off boost when being driven properly due to change of gear (loss of 1k ish).
My t34 sure doesn't.

 

Must be a matter of opinion then.

Don't confuse lower ratio and close ratio though, it makes a big difference, especially when combined.

I think my theoretical top speed has dropped from 170/180 to 140/150 and 5th is pretty long compared to the rest.

It would be interesting to hear from others who have moved from t34 to efr with the other changes as this is just what I have experienced...others may compare differently. I think my 205 prob feels less laggy though as the engine has about 200-350kg less to shove.

I do not think anything was off with the car before as Mark Shead had it for a long time and had the best results he had seen on a standard engine without changing anything other than the parts listed, I.e. There were no boost leaks or other fixes needed so I think it was in rude health when I dropped it off.

Even my tomcat turbo had lag on a tiny turbo and factory spec, I guess I just don't tolerate it. I am on my third car now with twin scroll and my 135i had 2. My efr spins up faster than my 1.8t Vw with ko3s (tiny) or my tomcat ever did. It is also more responsive than the 996 turbo I drove.

 

As far as ratios go I have a lower ratio than a 3.9 on a rwd saff and also a custom close ratio big tooth t5 box.
My topspeed would also of dropped from what it could of done on more standard ratios but I've had it well off the clock in 5th showing 170+.
In the real world it was prob more like 160 ish but it still had plenty more in it

Cheers Paul

 

My mates t34.63 car on a level 6 and greens mapped properly goes like stink and has no boost drop off at all, it's an awesome setup for what it is and what it cost

Cheers Paul