Tuning, AFR and Horsepower.

[socal pat]

I haven't seen a dyno in quite some time. Haven't done high performance driving much either due to a couple of mechanical issues which I fixed this last weekend. So I took the car to work today and on the way home really got on it a couple of times. My AFR was around 11.1 or so up to redline. I'm going to do a bit of srteet tuning when I can get a passenger to watch my gauges for me, but I was wondering how much HP (and/or torque) do you increase with 1point of AFR? I'm fine with being around 12:1, but no higher.

So any Dyno junkies ever come up with a rule-of-thumb? (TOM?)

[Satisaii]

We need to get Tom to come down to Socal for a dyno and tune day.

[socal pat]

Be careful what you ask for..... Do you have any good dyno shops in your area? What area?

[Tom @ Fast Forward]

Pat,

The rule on the dyno is to add fuel until power drops off and then back up a bit. For the 99-00, that appears to be about 11:1. 13:1 up to around 4K is OK. At least 12:1 after that. At 11:1, you probably wouldn't see less than 3-5WHP lost. I'd rather have the fuel. :)

Right now I could give you the dyno time over here but I have to finish this patent project. Toy Fair is the first of February. That would preclude anything but a real problem to get me out of Coolidge.

[Satisaii]

Maybe we might do something after the toy fair then. I am in no rush, since I just rebuilt my engine and have only driven it about 30 miles since then.

I am in Los Feliz, but don't mind driving. Seems like there were a couple of new owners in this area who might be interested, too.

[Tom @ Fast Forward]

Any time you and/or others want to come, I'm all for it, we have plenty of room here at the Miata hotel and can set some of this aside. I just can't get too far from home so I can make engineering changes as needed. As a matter of fact, right now most of my stuff is on it's way to the SLA people (this afternoon) and I will have the SLA parts in the morning. Those parts will be hand carried to China Saturday. That makes next week ideal for Miata playing. :-)

[Satisaii]

I don't trust my car to drive that far, and the S2000 is not set up as a tow vehicle.

Congrats on getting your stuff to China.

[Tom @ Fast Forward]

I see the S2000 has come to an end. Honda is not going to make them anymore.

Maybe after March we can get together there for a dyno day?

[Satisaii]

Well, done for now.

I almost brought the Pilot back from Texas last week. We discovered that it is handy to have here, but I just could not bring myself to do the 20 hour drive. I don't trust the Miata anymore. It stranded me twice with that computer problem, and I really would like to have a spare before I do a longer trip. Add in the MMR motor mounts and the harsh vibrations, I worry about things falling off the car.

[jwalton]

I see the S2000 has come to an end. Honda is not going to make them anymore.

Maybe after March we can get together there for a dyno day?

By then I'll be ready to join you at the dyno. My friend Doug (one of the other lucky clearance guys) should be ready as well. BTW, I obviously got the kit and the packaging was beautiful. Waaaaaaay better than the way I received the hotside kit from BRP.

On a side note, now that I've had a chance to really examine your intake manifold, what a beautiful/efficient design. Simple is usually the best. As an engineer, I'm all too familiar (personal experience I'm afraid) with the concept of over-designing something.

Now I just need to get my engine finished...

[Tom @ Fast Forward]

Ari (First kit ever SHIPPED) can tell you why I now use that box which costs me $39 each. It is called cheap insurance. Those kits are now in Finland, Australia, Tasmania, Hong Kong and a myriad of other far away places and they all arrive unscathed. Ari's kit 3 years ago was shipped from here to Las Cruces NM (341 miles) by FedEx and was basically totally destroyed.