Voith

Here is another very informative technical training guide for BW EFR BB turbos.. Sexy stuff

http://www.full-race.com/articles/efrturbotechbrief.pdf


Sorry for OT.

A.Wayne

It's more Tq earlier and longer also beats it hands down for power/Tq up to our tested 37 psi.

This must be their earlier attempts, this i can agree with, currently not so, reliability is not an issue and since we are talking race cars, not 100K delivery vehicles..


Again i could not find production date of turbo's used, a few years ago , after Garrett and Precision fell out, there stuff were bad. They have since fully revamped their turbo's a couple of years ago and these are the ones we used in development. So over the last 2 yrs much better stuff, For the record and prior to this i would never have recommended Precision turbos, horrible peaky stuff for drag racing only, not so today..

Garrett is well Garrett , but there are other alternatives and hey I'm still a big fan of KKK and a few of the BW are not bad too, the best journal bearing turbo's hands down were the Mitsubishi Greedy turbo's, Period !!!

Head to head with Garrett's I now favor the Precisions, this is not to say the Garrett is not a good choice.


YMMV

A.Wayne

Hey now .......

A.Wayne

Fixed boost..!

You should be power mapping that car for that circuit, well if you really wanted that 997 lap record ..

NZ951

Its about the VE of the engine for that comment isnt it. a LOT of 2.0 motors use that turbo to great effect, i.e. F20C.

NZ951

PS Duke the car looks amazing, love the aero...

Have you thought about the new Borg Warner FMW or EFR turbos? They seem to perform really well.

333pg333

There's always something better, faster, lighter, smarter...but I agree with Gustaf. So far the car is going very well and the money can be spent elsewhere. Aero is something that seldom gets mentioned in here. Seems to be largely overlooked in the U.S. at this sort of level anyway. After a point where power starts to become proportionally more expensive, aero is often the cheapest way to make big gains in lap-times. The Time Attack style format that we have focused on allows greater freedom in this field and that's why some of these cars are producing ridiculous laptimes. Sure, it's not 'Real Racing' but for most small self funded teams that just isn't an option. Time Attack allows us to build up our cars into something pretty interesting and still very satisfying. For the older set, it is either just totally off the radar or they think of it in the same terms as Drifters and therefore don't pay much heed to it. As a format though it is growing world wide and I can't see it waning for some time. We have an event down here each year (World Time Attack Challenge) that I hope Gustaf can oneday attend. It attracts cars from USA, UK, Europe, Japan, NZ and Oz. So I guess we are entered in the World Titles.

My drawn out point is that the 'New' Precision might be better than the equivalent GTX turbo but probably not by enough to swap over at this time. I like the EFR turbos too. Thought it might be a bit too big to fit but a guy in the UK is doing a very good job of fitting one. Helps to have some seriously good fabricating skills. Worth a look. http://forums.tipec.net/viewtopic.php?f=25&t=17459

NZ951

Thats some dedicated fab work. WIll be interesting to see how it performs. Seems a little small, I would have though the 8374 would be the go at least, but I guess for 450HP it will be good enough!

333pg333

Yes, very nice fabwork. I think for the car he intends, it's the right turbo.

Gustaf...sorry for getting off topic a bit but hopefully some of it is in context.

Thom

Obviously yes. Cam choice is also IMO critical on how a 951 engine will perform with a given turbo, etc.

A.Wayne

Duke,

My apologies if i dragged this off topic, my input was not a suggestion for change , just passing on some data which could have been useful or not ...

Ciao.....

A.Wayne

Depends, faster is enuff for me .....

333pg333

Faster = faster, true. Just depends on how you want to, or can get there. Swapping out to another turbo isn't so difficult (although not necessarily bolt in) but if the current one is going well enough then spending that extra few grand on materials to make Aero changes might be more significant.

NZ951

You would have to really thank WTAC for spreading the aero popularity. Its always been in motorsport, but WTAC have taken it to the extreme on a large scale. Pikes peak also helped.

333pg333

Agreed. Since we're playing for big money financial rewards though, we spare no expense! (That's a self Eye Roll...)