alpine003

Yes I know how dyno's work. I've done several runs on them(mostly Dynojet roller and a couple dynapacks) and tuned cars in the past. Hub based dyno's like Dynapack will allow you to emulate and tune part throttle conditions to a degree but most good tuners knows that the maps still need to be further refined on the road. I've never just been satisfied at tuning something on the dyno and leaving it as is, especially if you want a really refined ride that these kinds of cars deserve.

You also mention you used an aftermarket ECU. Per my post, I don't know anyone using aftermarket ECU's on a 996 on this side of the pond for FI hence the reason why it's even more difficult to crack the factory ecu for the DIY'er.

I love your blanket statement about just popping it on the dyno and enter in "some" values. I think you are oversimplifying things there.

If it were that easy, there would've been several more people on here that would've already done it.

fast996

yup semi-ontopic , for those of us that need to pass emissions, we need to stick w\ the DME , id love to get more options for DME tuning

w\out emissions, id prefer standalone and E85

alpine003

Amen with higher resistance to detonation allowing more aggressive timing, it gives a bit more safety blanket around tuning. Especially for those that aren't familiar around the characteristics of a particular motor.

Plus we live around Corn Fields and can get it for free. ( I wish)

NZ951

Ok so your point is now that the Dynapack isnt just about tuning WOT, like I said, and that you should do drivability tuning off the dyno, yup, agreed.

You can tune the Bosch ME7.2 easily with ODBII connectivity. You dont have to use an aftermarket ECU, I wasnt suggesting aftermarket, I only said I have mucked about with aftermarket ECU's. You would use the stock ECU as I previously mentioned, its not for the DIY'er, not sure how many DIY'ers have their own dyno and cables and software to tune.

I am not at all interested in FI as its mostly pointless since I have a track car already, and since most people would generally just buy a turbo, over spending money having other people convert NT to NATT, then maybe that explains why people dont DIY something up, not the fact it cant be done. I didnt say it was easy, I said the easiest part, from my perspective, is the ECU side of things. You can take that and spin it into the whole project is easy if that suits your argument.

NZ951

Incidently, I put a Lexus V8 into a Supra and it was NA, converted it to turbo, and from auto to manual... that wasnt hard, but cant speak for the 996 as I have not done it yet

alpine003

It could also be that all you OZ's and Kiwi's have dynos on practically every block and do crazy things down there that us Yankees do not. I definitely think you guys are further ahead of the tuning curve down there.

Still remember watching "Fast 4's and Rotaries" over 15 years ago and I thought you guys were crazy with the Evos and Cosmos back then. First turboed 20b triple rotary I've ever seen. And thanks to you guys, I actually contemplated on swapping over an Sr20Det to an e30.

If you guys know something we don't up here, please share it.

jrgordonsenior

I'm running the 3.6 crank/rods in my 99' 3.4 race car. I've got decked 3.4 heads & cams with the cable TB (FVD's enlarged TB). Dyno'd at 304 on a Dyno Dynamics machine so probably 325 or more on a Dynojet. I'm running it choked down to 292 and it still has incredible torque off the corners. I'm going to try a 2.5 Boxster TB on it to see if I can get it down in the 270's for a lower weight/whp class....

alpine003

I'd be interested in seeing your dyno sheet. That's a very nice gain. Did your curve get fatter too?

NZ951

There are a few dyno's but no more than usual I wouldnt think, though its mroe about their capability than the number of them. I guess we are just brought up on ECU's where you guys were mostly Carby's! I have been thinking about chucking my car on the dyno with the ODBII tuning to prove a point, but there isnt anything in it for me lol Since my car is a cruiser and not for modding...

alpine003

Not sure what point you are gonna prove? Any monkey with the given software can input values, and with little knowledge and theory can even read a wideband on a dyno and adjust a/f and ignition timing accordingly to some degree.

However, there is a difference between "so so" tunes and great factory like tunes in terms of daily driveability,reliability, and efficiency on aftermarket FI diy tunes. I've seen my share of "so so" tunes and only a handful of factory like tunes from the DIY community.

This I feel is due to the lack of that extra knowledge and level of effort to iron out these aspects. I can't tell you how many tunes I've seen with people just dumping fuel at 11:1 with very conservative ignition timing. Sure the car runs "ok" with certain rpm ranges but idles like crap, wastes gas, and doesn't produce as much power as it could.

I see two hurdles here for the DIYer(at least in the US).
1. Lack of user friendly software to interface with the Porsche ECU that is available to the DIYer
2. Dynotime starting around $100-125 per hour on the avg. can add up fast

This isn't a Honda or Toyota crowd and I would think Porsche owners would expect nothing but the best.

Come back to us if you find any DIY user friendly software for our ECU's or manage to extract 15-20whp from your existing motor.

jrgordonsenior

Torque and Air/Fuel ratios....

NZ951

No DIYer will be able to tune their own cars without a dyno, which not longer makes it a DIY job for most people, a wideband is only one tool for tuning, there is also knock and EGT to consider.

Sounds like the issue is totally about the skills of the resources available, for me, this is the easiest part of turbo charging, for others it seems to be the hardest.

alpine003

I beg to differ, dyno's are rented out all the time by the hour by DIY'ers here. I've seen several Honda/Toyota/BMW guys that don't do this professionally but try to DIY a tune themselves.

I agree that you need egt and knock to fully round out the tuning process. Per my previous post, I also have a set of headphones in addition to knock sensor because I'm ocd. I can understand that dyno shops will not be able to retrofit an egt probe on the hottest exhaust manifold bank but if you are DIY, you owe it to yourself to tap one into your setup. It's nice to know when you're approaching 1600 degrees.

I agree with you in regards to the level of difficulty whether it be on the tuning side or fabrication will be dependent on the individuals talents or resources available to them.

But right now, there is very scarce resources and software for the DIY in the Porsche market.

NZ951

You can rent a dyno here as well, but its hardly in the skill set of 99.9% of people to be able to operate them effectively.

Right so all you need is the ODBII connectivity software? I know someone that has it for the Bosch ME7.2 ECU. Which I think is the 3.4 motors ECU from 2000?

alpine003

When you rent a dyno here, there is usually a dyno operator that you work with if that's what you mean.

Please do share if you know of the software. That would be one step closer to do DIY tuning. The right drivers help as well since some software need specific drivers.