another great Mark D review

[Mystikal]

Um, both? Mine happen to be from an S50.

[dougsic]

Nice. I would do the injector upgrade if a device like this was available. I would have to send back my Mark D chip and get the one for bigger injectors though ;) hopefully he does exchanges. Any idea how much that device will cost?

There is a long thread about the correction device on the 24v forum.

I don't think Steve has set a price just yet awaiting final product costs, though he may have by now.

I traded him a stock s50 chip to install in his m50 and at that time (several months ago) he was expecting to bring this product to market for under $100.00.

After using it for a couple of weeks, I was so happy with it I offered to pay him $100.00 and let him keep the stock chip.

But then I'm obsessive about my cars and the wrong Econometer reading was truly driving me nuts.

[Curtis325is]

Larger injectors actually make the OBC 100% accurate, ironically.

I have 17.5lb S50 injectors, and my OBC is now dead-on from calculated mileage (data taken from odo and actual fuel pumped in).

and how do you explain that? considering the gauges are programmed for stock injectors and the car has no way of knowing you are now using bigger ones.

What will happen is your car with use the O2 sensor to try to figure out the correct mixture, mean while your OBC and MPG gauges are working based on how often and how long the injectors are firing...but it thinks they are 14.5lb injectors...so it will be telling you that you are getting way better mileage then you really are. This is one reason why people who do injector swaps wrongly think they get way better mileage with bigger injectors, and why bigger injectors alone are not a good upgrade without proper tuning.

[Mystikal]

I can explain it quite easily. With the stock injectors, the OBC consumption was not accurate. I manually calculate my mileage on every fillup, the OBC was always off.

When I went to 17.5lb, it became dead-on consistent, every time.

[fiercee30]

i am new to the whole mark d chip i ahve heard of DTM chips or dian but bot mark d what exactaly and were can i find one for my e30 are the cheaper then dian or dtm chips ?

[e34john]

^^^

https://www.dsylva-tech.ca

[turbolesstom]

these chips work in an iX right?

[kamotors]

Just got my mark D 19lb injector chip installed that I bought from z31maniac, and I'm amazed at what a difference it made over the regular Mark D 14lb injector chip. My car kept on detuning my 19lb injectors before and causing a bit of lag on take off, but now it just gets up and goes. Lets hope it doesn't de-tune itself. I went from going about 80mph on the freeway ramp with my old Mark D chip to now being able to hit around 85mph and thats all because when I got on the gas the car actually moved instead of bogging and then going.

[delatlanta1281]

I don't think it detuned on mine, are you running a larger FPR?

[kamotors]

I don't think it detuned on mine, are you running a larger FPR?

no I'm not, should I be?I know that after about 1 week my car used to lean out and I'd be down on power below 3000rpms, and after installing this chip, it just goes, its great. I'll update in about 1 week to see if its de-tuning anything, if it does I guess i'll try an adjustable FPR.

[Kaldar142]

So is it worth it too upgrade to 19# injectors? What kind of performance advantage does this offer?

[kamotors]

Just got my mark D 19lb injector chip installed that I bought from z31maniac, and I'm amazed at what a difference it made over the regular Mark D 14lb injector chip. My car kept on detuning my 19lb injectors before and causing a bit of lag on take off, but now it just gets up and goes. Lets hope it doesn't de-tune itself. I went from going about 80mph on the freeway ramp with my old Mark D chip to now being able to hit around 85mph and thats all because when I got on the gas the car actually moved instead of bogging and then going.

well, the bottom end bog is back:( it goes away when the ECU is reset what does this mean? I'm on my third different ECU & third kind of chip and they all do it:(

[Alkasquawlik]

these chips work in an iX right?

ya
its the same engine

[crazyrabbittown]

well, the bottom end bog is back:( it goes away when the ECU is reset what does this mean? I'm on my third different ECU & third kind of chip and they all do it:(

so how often are you resetting the ecu
and is that just un plugging the batt
how much of a performance loss is there before you re set it

anyone else having this problem ?

[kamotors]

so how often are you resetting the ecu
and is that just un plugging the batt
how much of a performance loss is there before you re set it

anyone else having this problem ?

I only reset after getting new chips or other upgrades or to see if resetting the ECU really fixes this problem. I reset it after getting the new headers on and I thought that the car felt great, poor idle, but when I got on the gas the car just took off, now after about 500 miles the bog is back, basically what happens is I floor it the car it takes off really slow and then just has all the power kick in about 1k rpms later than normal, its as if the powerband just kicks in later. On 2 freeway runs I picked up about 5mph on a non adjusted ECU with the same chip. If the car is moving at about 15MPH and I floor it, it takes off perfect, but if the car is stopped and I floor it, it just bogs and then goes.:( the bog is actually really noticeable. my car gets no CEL after the ECU is adjusted, only while the ECU is still learning does it get the 1222 code because of the bigger injectors. my O2 sensor is about 1 year old.