Author Topic: Mark D chip// Boost (Read 3816 times)

eatotie · « **on:** June 03, 2009, 12:37:49 AM »

I recently purchased a 93 oct chip from markd and its great! But within the next 2 weeks ill be boosting the m42 and im not sure if ill be able to use that chip with a turbo setup. Anyhelp?
is it even possible to run the stock ecu with a turbosetup?

p.s. new to the site. so uhh... (when i first got her)

bmwman91 · « **Reply #1 on:** June 03, 2009, 01:20:15 PM »

How much boost? In general, I would say no, you can't (or at least shouldn't) run a 93 octane MarkD chip with a turbo. For low-boost rigs (<8psi), I have read that the stock chip is more or less fine (with some larger injectors proportional to the amount of boost being run), using a higher pressure fuel pressure regulator. The big issue is ignition timing. The stock chip has very conservative ignition advances, and the big gains come from advancing it a bunch in performance chips. That is probably a no-no under boost, given the stock CR of 10:1.

What are your turbo plans exactly?

eatotie · « **Reply #2 on:** June 03, 2009, 05:50:43 PM »

Low boost for this summer I have the manifold and a stock rx7 turbo with wastegate and oil lines i was planning to only run about 5-7 lbs with no work to the internals or injectors.
may even skip the intercooler.
am i still in the safe zone?

bmwman91 · « **Reply #3 on:** June 04, 2009, 01:27:14 AM »

Well, it MIGHT be worth a try. I think it sounds a little risky though. The M42 is well built, so you might just end up with some pinging. Push too hard & you could toss a rod or melt something.

Maybe try running it on the stock chip first. Hopefully you kept it.

eatotie · « **Reply #4 on:** June 04, 2009, 02:00:59 AM »

hmm well ill have a play with it & see what happens, this weekend ill update with some pics. All together the whole setup cost me less than $500 =j and im sure with the stock chip i can get 5lbs safely
thanks for the info.

dude8383 · « **Reply #5 on:** June 05, 2009, 09:00:03 AM »

Where in NY are ya?

eatotie · « **Reply #6 on:** June 05, 2009, 07:08:33 PM »

Im from Queens side. You know anyone locally that wants a mark D? lol i hope i dont get knocked for trying to sell stuff outta the buy/sell thread.

dude8383 · « **Reply #7 on:** June 06, 2009, 10:15:53 AM »

Quote from: eatotie;73099

Im from Queens side. You know anyone locally that wants a mark D? lol i hope i dont get knocked for trying to sell stuff outta the buy/sell thread.

sorry don't know anyone looking for a markd chip...

there's a meet tomorrow in jersey:

http://r3vlimited.com/board/showthread.php?t=139673