Q&A

Good afternoon
(usually hanging around in the Cup car forum, but have a 964 Turbo question)

I bought a 964 Carrera 2 that has been completely stripped, and build up as a race car, including 996 Cup wheel hubs with center lock,
Airjacks, FiA approved roll cage, Automatic fire extinguisher system etc etc. The original 3.6 liter engine was rebuild to 3.8 liter Biturbo with 996 turbo's
Gearbox is a 996 Cup (6 speed) gearbox. A 993 ECU has been remapped to match up with the previous modifications.
Weight is 1050 kg now and engine should produce close to 600 HP

There is no data from this remap unfortunately

After i bought the car, we did some runs and the car performed very poor. It stalled after it got hot.

We opened the engine, and many little things were in very bad shape.
We did a full engine and turbo rebuild and replaced everything that was needed, and kept it in the same spec as how i bought it initially.

Now the day has come to do a test run.
Decided to do this on a dyno first, before hitting the track.
The dyno i am going to, is able to measure lambda values (o2 sensor) and turbo boost.

Question:
1: Would this dyno run, be able to asses a healthy engine in terms of running not to lean or to rich, and having the correct ignition timing.
2: What can you possible adjust on these engines, to make it run better, without reprogramming the ECU (via Eeprom)

Thanks a lot in advance

Scott Dunavant

You have a completed modified engine. 964 turbo's are super old mechanical injection. There is 2-3 on here that can answer your questions. Chris at TurboKraft handles heavily modified 911's But in shop only. Cobalt and Fritz k. Can help.

Can we see the rest on the engine set up?

peterpullin

if the rest is made as your weldings the thing will never run. omg…

fritz k.

Goeddemiddag, wrong forum chapter and wrong approach. At the end of a revision of a competition engine, there should of course be a dyno run for tuning, but this also includes any necessary adjustments to the mapping. You not only have to be able to measure the lambda value, but above all you have to know how it has to be in which operating range and on what boost pressure.

This takes experience and I wouldn't rule out changing the eprom, even if in the end it turns out that only minor adjustments, e.g. B. on fuel pressure, are required.

Since you are based in Amsterdam, the route to Germany is not far and the addresses of the partners for this task are probably known.

Fritz

Q&A

Thanks Scott, and Fritz.
I was assuming the delicacy of these engines and therefore wanted some extra feedback.
We are going to McChip-dkr on friday and have a follow up with another specialist with a dyno too, who can also program the ECU.

@Peter:
Do you feel good now, kicking around like that to someone you don't know, about a car you have no idea about ?
You can't call yourself a Racer if you come up with these comments.

peterpullin

@Q&A i have eyes. the welding is absolutely unprofessional. look like a trainee did it‘s first work. if that bugs you, sorry! does not change my look on this.
and you are wrong, i could help. if i wanted…

Igooz

Your car looks fantastic! Did it start life as a 965 or 964C2 and then modified with the widebody, and other stuff?

Was this car ever in the US and go for sale about 6 years ago in NY/NJ area at a race shop, or always in Europe?

It has been a million years since I have thought about this, but there were several different DMEs. The 964 is different than Gen I 993 (pre OBD II '95) which is different from the Gen II 993 (OBD II '96-'98). The latter having a much larger connector and Varioram controls. Are you using the MAF, knock-sensor, and of course O-sensor on the latter. The early ECM had a removable EPROM, but the latter did not, and so I am guessing that you have a pre-OBD II ECU. You can have different levels of control as well as reflash complexity. I am not familiar with the European folks.

Good luck and I would be interested in learning about the dyno day.

Scott Dunavant

I guess Peter is correct. I couldn't get away with those welds on a 2002 Honda Accord. I have plenty of burns from welding. I get to see them while swimming. Absolutely love welding. If I was in your town I would layout those welds for you.