Dyno Question

[briankeithsmith]

Dyna-pak dyno - now that's a dyno!
Those things are great!

As far as the strap thing, like I said, I don't have any physics data or anything like that that proves its a good idea or a bad idea. I'm just saying if I showed up at your shop, and you started strapping my car down like that - I wouldn't like it - I'd get my car, and go somewhere else.

More personal preference - and to me - it looks scary.

[DSPTurtle]

Just got back from the dyno. I am pleasantly surprised!!! Car is box stock and made 283.5 Torque and 253.1 HP. He stopped pushing it at 160 mph cause we passed max power but it still had some legs. I am most excited that the AFRs look good all the way through the pull.
He was able to give me a hardcopy of the raw data so I will plot it manually cause it looks like there is a pretty big flat spot at 4500 rpm. But then again, with CIS there is not too much we can do about it anyway

[RarlyL8]

A stock 1985 930 should put down 255HP to the ground.

Looks like you need to give Brian Leask a call. Your A/F takes a dump at 3000rpm and never recovers. There is some power to be gained there.

[DSPTurtle]

I thought we want it to richen up on boost? 3k is exactly where the boost kicks in. Doesn't that mean the CIS is doing its job?

[NathanUK]

If you look you can see the afr dips to nearly 10. This is a little rich and is washing the oil from the bores...

Those numbers are better than being too lean though, 12 is the target.

[Craig 930 RS]

Brian is absolutely correct.

I *guarantee* you are missing 25hp and 30 lb ft tq, wasting gas, and fueling the oil

[DSPTurtle]

Originally Posted by Craig 930 RS

Brian is absolutely correct.

I *guarantee* you are missing 25hp and 30 lb ft tq, wasting gas, and fueling the oil

Sweet... what does that mean?

At this point I would rather run too rich then burn a hole in a piston.

But, it was about 90 degrees outside so I wonder if during the cooler months this will make a difference. I think I will get a Gunson though just to play with A/F. I would love one of those LM1's but I have no place to mount the pickup.

All in all, not bad for a 25 year old girl with 100K miles on the clock...

Question is though... do I need an adjustable fuel head, or do I just need to lean out the overall mixture some. It stays flat so I am guessing that if I lean the mixture a little in will stay above 10. Remember though, this is just a baseline run of a completely stock motor... stay tuned for the inevitable, what shoudl I do next!!!

[Craig 930 RS]

That is WAyYYy too rich. While your statement is true, you can also make the AFRs in the *correct* range.

An adjustable WUR is in your future - bleask@cox.net - contact Brian Leask.

[TimT]

Holy thread resurrection Batman!!!

A car strapped to the dyno by its rollcage!!


This vid someone posted on rennlist.... tweaked one of those distant memories.... from way back when...




and this is an example from the shop....






Now why was that 991? (or is it a 997) not strapped down to the rear suspension or something...

[JJ 911SC]

Originally Posted by TimT

Holy thread resurrection Batman!!!...

6 years +

You are definitely CRAFT decease free