S65 Motor Limitations

DSilk · 04-11-2017, 09:58 AM

Quote:

Originally Posted by furquiza

correct me if I'm wrong, as I'm not as up to date on current DTM regulations, but most racing of that caliber has strict regulatory power outputs that teams/manufacturers are not allowed to go over regardless of whether the motor can take it or not. so I'm not sure that I would necessarily use that as a good example for this. no intentions of bashing anyone here, just thought that it should have been pointed out.

My understanding is that DTM requires the use of a 4 litre 90 degree V8, but there are no power caps. Each team is allowed only 1 spare engine, so reliability concerns create whatever cap there might be.

PHM3 · 12-09-2017, 03:55 PM

Quote:

Originally Posted by DSilk

My understanding is that DTM requires the use of a 4 litre 90 degree V8, but there are no power caps. Each team is allowed only 1 spare engine, so reliability concerns create whatever cap there might be.

Engines use air restrictors
http://www.dsf.my/2017/04/10-facts-a...61-dtm-engine/

doogee · 12-11-2017, 09:47 AM

Quote:

Originally Posted by SYT_Shadow

Someone will build a real 9000 rpm S65 motor... just wait

There are quite a few motors around with 10,000rpm +

DSilk · 12-11-2017, 12:08 PM

Quote:

Originally Posted by doogee

There are quite a few motors around with 10,000rpm +

True, but most of them are in motorcycles!

doogee · 12-11-2017, 02:29 PM

Quote:

Originally Posted by DSilk

True, but most of them are in motorcycles!

No sir! S65s!

BOOF-M3 · 12-11-2017, 02:51 PM

Quote:

Originally Posted by SYT_Shadow

Quote:

Originally Posted by K-M3

I think even the most recent Bmw M4 DTM race car that carries a NA 4L V8 makes about 500hp.... so does porsche's 4L NA flat 6 in the new gt3 at a 9000rpm redline .... I would want to think that would be the tops without FI

Mind you, the new GT3 'revs to 9000 rpm' but makes peak power way before that. At 8250. So like an M3

The 9k rpm is pure marketing BS. The rotating assembly is strong enough to rev to 9000 but won't make power past 8250.
This is akin to the N55 making peak power at 5500rpm but 'revving' to 6500. Pure BS.

If you had proper cams to keep making power at 9000rpm it would have many more horses

At what RPMs is peak power then Danny? I have noticed that I can chirp (DCT) 2nd at a little over 5,500 but not if I'm in the 8,000 range. Is there a thread showing what the perfect shift points are or is it at 8,300 In every gear? Stage 2 tune, pulleys, intake and exhaust change these numbers?

SYT_Shadow · 12-11-2017, 03:16 PM

Quote:

Originally Posted by BOOF-M3

At what RPMs is peak power then Danny? I have noticed that I can chirp (DCT) 2nd at a little over 5,500 but not if I'm in the 8,000 range. Is there a thread showing what the perfect shift points are or is it at 8,300 In every gear? Stage 2 tune, pulleys, intake and exhaust change these numbers?

peak power in the S65 is at 8300 rpm. Pretty much regardless of mods except if you do a stroker.

Someone compiled a list of optimum shift points. In the 6MT/DCT I figure it's redline in every gear