AFM + MarkD chip or MAF+Miller chip

[AngeloF10]

84k on the clock and car runs totally fine. Main objective here is better performance out of this M20. Which direction should I be going in?

or if there is another, I am all ears.
and should I be considering the larger injectors?

-Angelo

[MrBurgundy]

What sort of performance improvements are you looking for? HP or just a more responsive engine? Those two options are not going to give you much of a power gain, but the engine will be much more responsive.

If money were not an option, obviously the MAF upgrade is the way to go.

[ThatOneEuroE30]

If your getting a chip go with an sssquid chip he does it according to your setup. Mark d and some of the other made those tunes years ago and haven't updated them.

[AngeloF10]

Thank you. What do you think about injectors?

I am looking for overall drivability and a little more power.


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[Das Delfin]

I can't speak for the others but I can tell you I have m50 injectors and a markD 17lb 91 octane chip in my car and it makes a noticeable difference vs stock. Especially in the mid range. 3.5k-6k is more fun and pulls harder/no dead spots now.

From what I understand a MAF would get you better throttle response over your AFM. I'm not sure about what the miller chip gets you.. didn't go that route because of money. But you could also adjust your AFM so that the two contact points are sliding across an unworn section of track. Which of course is free so I'd try that before spending the money on a MAF

The injectors + chip cost me $300 but I wanted to clean/replace my old stock m20 injectors as a maintenance item anyway so really I'd say I'm in $200 for the chip

[Zeemz]

I had a AEM CAI on my Integra in college, it probably improved performance a little, but I will admit, what I mostly loved how much it changed the sound when it was at wide open throttle.

I've been tempted to buy the Miller PSIK intake for awhile. I am not expecting 25HP as it claims, but I am sure the care would probably be a little more responsive and I would love to hear the M20 wake up and growl a little more. For $525 you get a CAI, Miller Maf, and the standard Miller chip. That sounds pretty good to me.

https://www.millerperformancecars.com/store/show-by-car/e30/m20-cold-air-intake-maf-kit-psik-detail

[DesertBMW]

84k on the clock and car runs totally fine. Main objective here is better performance out of this M20. Which direction should I be going in?

or if there is another, I am all ears.
and should I be considering the larger injectors?

-Angelo

Don't waste your money. I've done many mods to M20 and stock still feels the best. People here claim that the mods gave them more HP but I know it is all BS

[AngeloF10]

Thanks for the honesty. Maybe I'll use the money for an exhaust


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[Bearmw]

I found the Miller PSIK to be worth the money on the car I installed it on. A stock 325is with only a lighter flywheel and an eBay cat back.

[ForcedFirebird]

Don't waste your money. I've done many mods to M20 and stock still feels the best. People here claim that the mods gave them more HP but I know it is all BS

This is kinda true. I have played on the dyno to have real word results.

Stock airbox makes about 5whp more than any CAI we have tried.
Removing the stock air horn inside the box lost 4whp.
Clutch fan removal gained .4whp (yes point four).
Remove PS and A/C belt gained 4whp.
Typical chip gained 4whp.
Headers lost 3whp/gained 5wtq

Things that don't gain on stock engines (or even lose without matching chip/software):

M30 AFM
19lb injectors
17lb injectors
BBTB was hardly measurable, but did gain slightly at tip in/low RPM

Now, you CAN free up HP that's being gobbled up with rotating mass etc. Light FW, lighter wheels, crank scraper, better (proper) exhaust etc (I saw "proper" since many people go overboard with it - m20's don't need 3").

You can use the Spec e30's as a guide. Most worn/tired/non-rebuilt m20's will do about 145whp. Fresh head will put you over 150 (154 is avg, best was 157), but then you get in the upper 150's removing accy's and adding a 2.25" exhaust with a single 15" resonator (have seen as much as 162). A balanced and well built m20b25 with .5mm over pistons will get you closer to 170whp - I haven't seen one break 170 yet, but super close. This is all on stock ECU's/chips/AFM's/injectors too.

[digger]

I've yet to see a decent (i.e from reputable place) PNP off the shelf chip not drive a bunch better that a stock chip. dont expect much in the way of peak power gains but midrange was always a bunch better. a custom chip was miles ahead of the stock chip for drivebaility and did make gains across the board.

if you dont add the right parts then you wont improve anything, alot of aftermarket stuff is junk and good parts cost money, people with m20 dont wanna spend money combine that with its cheaper to buy a more modern faster car many much of what you see is a step backwards

[ForcedFirebird]

I've yet to see a decent (i.e from reputable place) PNP off the shelf chip not drive a bunch better that a stock chip.

Some chips. I have read a few big name files that didn't change anything in the part throttle maps, only WOT map - or - they would just add xx° of timing across the whole map, and almost all of them raise the limiter.

Mark, Squid, JimC are mail-order that actually tune the whole thing. We tune them live, but refuse to sell mail order.

[AngeloF10]

I have no problem with spending some cash. I just want a solid running M20. No swap. I already have a 328 wagon (F31) M package, exhaust, tune, etc.. for my daily. Plus another family car.

I was thinking exhaust and possibly a tune but seems like I'd get minimal gains. Again, don't need it to be fast, it's a convertible anyway. Just a nice cruiser.


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[MarkD]

If your getting a chip go with an sssquid chip he does it according to your setup. Mark d and some of the other made those tunes years ago and haven't updated them.

Why does a chip that works need an update?

[ThatOneEuroE30]

Why does a chip that works need an update?

New things have been learned and found out. Tube screen tv’s work but i bet you’ve upgraded to an led/lcd flat screen...