Dinan Performance Chip

[dirty30]

I recently just purchased a 1990 325is and found in the glove box a Dinan performance chip. If anyone could give me any information or background on this chip and its benefits for my E30 that would be great.

[B C]

It only changes the timing advance on the WOT timing maps. Expect 8-10hp over stock. 

93 octane may not absolutely be required, especially in winter. I ran 89-91 without issue on a MarkD tune. 

MarkD chip + 19lb Bosch Design III injectors is definitely the way to go for motronic chip tuning if you were trying to get a little more out of it.

[dirty30]

Thanks alot. 

Any ideas on intake and exhaust that I could pair with the Dinan chip?

[B C]

For reasons of packaging, it is extremely difficult to fit a proper intake on an M20 E30. The cruise control, abs motor, coolant overflow (late model), airflow meter, and headlights make the space extremely tight. The Kamotors air intake is pretty decent because it provides heat shielding and it fits, The filter is very cheap. If there was a higher quality replacement filter then I think it would be the best setup. You CAN find the same intake on ebay for less money. People believe "Kamotors" fabricates the kits himself but he is merely a re-seller. Nothing wrong with that, its just the community thinks they can only obtain those intakes from Kamotors.

I was able to fit an ITG foam filter (best air filters IMO) after removing the factory AFM and running a megasquirt ecu. Most cone filter kits/adapters for the stock AFM provide little to no transition from circle to square which causes for massive turbulence and a noticable loss of low end power. The stock E30 exhaust system is a wonderful piece in my opinion but the muffler can be changed out for a less restrictive one. 

I dont suggest headers or a full exhaust system unless you plan on extensively modifying the engine.

The ROI is pretty poor and the money spent could be much more satisfyingly applied towards tire,wheel, suspension, and brake upgrades

K&N drop-in filter + magnaflow straight through muffler is my vote.

[dirty30]

Thanks alot man. Big help

[B C]

Best bang for your buck, after taking care of maintenance and tune up items is going to be a set of rebuilt m50 fuel injectors for $75 shipped from Maks Injection.

[jc43089]

What do you gain by swapping injectors on a stock m20? Won't that throw off the tune? Also are m20 injectors that close to the limit already? Just trying to learn.

[B C]

The atomization of the newer injector design is much better

M20 injectors are 14.5# at 3bar

M50 injectors are 17.5# at 3.5bar

Since the M20 has a 3bar fuel pressure regulator the M50 injector flowrate drops to ~15.8# at 3bar.

It requires an ecu reset to reestablish the long term fuel trim which, with a healthy o2 sensor is flexible enough to compensate for that 1.3# difference.

[jc43089]

Excellent info, thanks. I didn't know about the different pressures.

[B C]

M50 are actually Design II, but the difference with the Design III is the plastic body for less fuel vaporization and slightly less noise over Design II

Design II's atomize nicely. here is somewhat of a comparison. (compare 1:20 vs 3:20)

[dirty30]

Would dropping M50 injectors into a N/A engine be a bad idea?

[Earl]

Nope=)