Originally posted by betz
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2.8L M20 9.8:1 stroker build: my 323i reincarnated
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Dyno day is scheduled for Thursday the 15th.'86 Burgundrot 325 2.8 stroker.
Build thread
Other cars:
2000 Porsche Boxster
2006 Subaru Outback XT 5MT
1972 Porsche 914
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Originally posted by 2mAn View PostYes, and ... its time to pay the piper.
Lets see the plot
Good news is nothing blew up and I got a plot.
Bad news, seems like this issue I thought went away has definitely not. I get what kind of seems like a fuel cut at 4700 RPM, the tach shoots down then back up. The motor will continue going but the dyno thinks it's backing off so I didn't get to measure it all the way to 6500+. Since I rarely experienced this on the road, we thought it had to do with the load, which it didn't since the last pull he put it at basically nothing. Will try and sort it out, shouldn't be *too* hard.
Super nice dyno, it seems to measure or estimate crank hp actually. Looks like I'm getting 182 ft*lbs at 3825 RPM and 162 hp where the tach cuts at 4660 RPM. We estimated that peak HP is at least about 200. Edit: see post below for graph
'86 Burgundrot 325 2.8 stroker.
Build thread
Other cars:
2000 Porsche Boxster
2006 Subaru Outback XT 5MT
1972 Porsche 914
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Originally posted by CharlieVu View PostWow! Read the first 5 pages and can’t wait to finish the other 19 tomo on my lunch. Most of the language n parts is gibberish to me right now but you’ve got me wanting to learn what all of this does for the block. Sorry about the 323 but know, it all happens for a reason!
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Otherwise I agree with awdbob in every way. OEM parts only for timing belt job... Leave water pump alone as they rarely ever leak! Rear struts are known for blowing out at 100k. kyb Gr2 from an '04 outback work great! Beefier rear swaybar and rear rallitek springs worked well for me too. Cool subie and cool BMW! I'm currently building a stroker for my e30. This thread got me excited!
Btw If you ever want more power in the XT I have a Cobb access port and a catless up pipe that I'm looking to get rid of. Best of luck!
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Especially with your tach dropping out, I would wager that you're having a CPS signal issue. Check the resistance, check the air gap between the toothed wheel, and pray that it is not a problem in the wiring somewhere. A new metal body CPS is about $140. I've heard a lot of bad things about the cheaper plastic body ones.
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Here's a better screencap of the best dyno run, since I just received the PDFs. Swapping out ECU and hopefully that will solve the issue.
'86 Burgundrot 325 2.8 stroker.
Build thread
Other cars:
2000 Porsche Boxster
2006 Subaru Outback XT 5MT
1972 Porsche 914
Comment
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Originally posted by betz View PostHere's a better screencap of the best dyno run, since I just received the PDFs. Swapping out ECU and hopefully that will solve the issue.Simon
Current Cars:
-1999 996.1 911 4/98 3.8L 6-Speed, 21st Century Beetle
Make R3V Great Again -2020
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Originally posted by betz View PostHere's a better screencap of the best dyno run, since I just received the PDFs. Swapping out ECU and hopefully that will solve the issue.
Also the numbers are going to be lower than you probably think but you can't compare to a dynojet anyway as they will be 5-10% lower from what I have seenLast edited by digger; 03-22-2018, 03:18 AM.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Originally posted by digger View PostThat's way too rich as well as what ever ignition / cps issue is killing it
Also the numbers are going to be lower than you probably think but you can't compare to a dynojet anyway as they will be 5-10% lower from what I have seen
Sorry to disappoint 2man but it's just another 173 ECU. I really want to do a full standalone... I've been looking into some other PNP options but nobody seems to be doing it anymore. Might have to sink it all into a MSPNP. Problem is, if I get one, I know the $800 isn't going to be the end of it. It will be more live tuning and dyno time.. which means emptying my wallet yet again :('86 Burgundrot 325 2.8 stroker.
Build thread
Other cars:
2000 Porsche Boxster
2006 Subaru Outback XT 5MT
1972 Porsche 914
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aw maaaaaan... It's not the ECU, I knew it. At least not a bad ECU...
Here's the issue
Just another quick soul searching montage and I'll have it figured out.'86 Burgundrot 325 2.8 stroker.
Build thread
Other cars:
2000 Porsche Boxster
2006 Subaru Outback XT 5MT
1972 Porsche 914
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