BMW M3 Forum
BMW M3 Forum BMW M3 Gallery BMW M3 Reviews BMW M3 Social Groups BMW M3 Chat M3Forum Sponsors >>
Loading


Mobile M3forum
Go Back   BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X) > BMW M3 Discussions > E36 M3 (1992-1999)
Tire Rack Buy Winter Tires Now!
Not a member? Register Now!
Register Gallery All Albums Garage Search Today's Posts Mark Forums Read Calendar FAQ

E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


Reply
 
Thread Tools Display Modes
Old Fri, Sep-29-2017, 04:44:12 PM   #11
M3n00b
2012 M3F Formula 1 Game Champion!
 
M3n00b's Avatar
 
Join Date: Jun 2008
Posts: 25,940
In the garage:
Reputation: 0 M3n00b is on a distinguished road
Location: CtPaTown, OC, CA, Trumpistan

North Korea




Default Re: E36 m3 5.5k rpm loss of power when hot

Quote:
Originally Posted by EurAutoJunction View Post
Bad dme perhaps? If it was a tune I need, wouldn't the consistency of power be the same on all temperature?
Not bad, just confused, air temperature affects it's density and the computer is confused at higher rpms when hot. It's programmed for thinner runners.

-tapa
__________________
Jump to top M3n00b is offline   Reply With Quote
Sponsored Links
Register now and remove these ads
Old Fri, Sep-29-2017, 05:35:42 PM   #12
EurAutoJunction
Registered User
 
Join Date: Aug 2015
Posts: 58
Reputation: 0 EurAutoJunction is on a distinguished road

United States




Default Re: E36 m3 5.5k rpm loss of power when hot

Quote:
Originally Posted by M3n00b View Post
Not bad, just confused, air temperature affects it's density and the computer is confused at higher rpms when hot. It's programmed for thinner runners.

-tapa
Hopefully that is the case. The day I was out there, it wasn't that hot (89 degree with 18% humidity). I just took it out for a spin and it diff has power all the way til redline in 1st and 2nd. The lag up high is diff gone since the clutch fan is gone. I will try it in the higher gears later when the temp goes up a bit.
__________________
17 golf gti DD
97 m3 WEEKEND TOY
89 325i SOLD
87 325is SOLD
95 525i TOTALED
87 325e SOLD
91 318is SOLD
90 240sx coupe SOLD
89 240sx hatchback SOLD
Jump to top EurAutoJunction is offline   Reply With Quote
Old Fri, Sep-29-2017, 06:21:34 PM   #13
Braymond141
Registered User
 
Braymond141's Avatar
 
Join Date: Aug 2005
Posts: 19,612
Reputation: 0 Braymond141 is an unknown quantity at this point
Location: Oakhurst, CA

United States




Default Re: E36 m3 5.5k rpm loss of power when hot

Answer the trap mph question please.
__________________

1996 M3 Journal | MSportParts
Jump to top Braymond141 is offline   Reply With Quote
Old Fri, Sep-29-2017, 07:45:18 PM   #14
EurAutoJunction
Registered User
 
Join Date: Aug 2015
Posts: 58
Reputation: 0 EurAutoJunction is on a distinguished road

United States




Default Re: E36 m3 5.5k rpm loss of power when hot

Quote:
Originally Posted by Braymond141 View Post
Answer the trap mph question please.
15.1/91 mph, 14.5/95 mph, 14.8/92 mph
__________________
17 golf gti DD
97 m3 WEEKEND TOY
89 325i SOLD
87 325is SOLD
95 525i TOTALED
87 325e SOLD
91 318is SOLD
90 240sx coupe SOLD
89 240sx hatchback SOLD
Jump to top EurAutoJunction is offline   Reply With Quote
Old Fri, Sep-29-2017, 08:13:13 PM   #15
Braymond141
Registered User
 
Braymond141's Avatar
 
Join Date: Aug 2005
Posts: 19,612
Reputation: 0 Braymond141 is an unknown quantity at this point
Location: Oakhurst, CA

United States




Default Re: E36 m3 5.5k rpm loss of power when hot

Yikes, yeah you have a motor issue for sure. You should be hitting 98-101 with minor mods and stock weight.
__________________

1996 M3 Journal | MSportParts
Jump to top Braymond141 is offline   Reply With Quote
Old Fri, Sep-29-2017, 08:18:52 PM   #16
pbonsalb
Registered User
 
Join Date: Jun 2005
Posts: 3,383
Reputation: 0 pbonsalb is on a distinguished road





Default Re: E36 m3 5.5k rpm loss of power when hot

The 14.5 at 95 is OK for a stock car, but the other traps are low. I think you are right that you are down on some power on the top end. If the clutch fan was locked up and spinning at engine rpm, that could have an effect if I am correct in understanding that the viscous coupling inside allows slippage at high rpm in addition to providing temperature related partial lockup.

With your mods on a sorted out car, even with no tune, you should be around 100 mph.

Hopefully you will go back to the track with the electric fan and tell us how it goes.

I am stuck in the low to mid 11s in the low 130s for a couple of years, but have not run this year. Broke enough stuff that I need a rest. I even break stuff just driving on the street. Diff output stubs, driveshafts, clutches, transmissions. And a totally-my-error at the strip mis-shift cost me a cylinder head and some valves. But I rebuilt everything except the trans stronger. On my 3rd ZF320. They don't like 500-600 lbs rwtq. Might try a 420G next or maybe a T56 Magnum, but the T56 with bell housing adapter is a $4k project. It does get rid of the sloppy shifter, though, since the shifter comes out of the back of the trans rather than connecting to it by a linkage.
Jump to top pbonsalb is offline   Reply With Quote
Old Fri, Sep-29-2017, 09:57:51 PM   #17
englishtom1596q
Registered User
 
englishtom1596q's Avatar
 
Join Date: Dec 2009
Posts: 2,469
In the garage:
Reputation: 0 englishtom1596q is on a distinguished road
Location: The Mitten

United States




Default Re: E36 m3 5.5k rpm loss of power when hot

Bad knock sensors
__________________
Jump to top englishtom1596q is offline   Reply With Quote
Old Tue, Oct-03-2017, 04:36:50 PM   #18
abcurran
Registered User
 
Join Date: Apr 2010
Posts: 481
In the garage:
Reputation: 0 abcurran is on a distinguished road
Location: Brooklyn

United States




Default Re: E36 m3 5.5k rpm loss of power when hot

Quote:
Originally Posted by englishtom1596q View Post
Bad knock sensors
Or cam sensors. It sounds like something is retarding the timing above 5.5K RPM on the "hot" runs. I wish I had an explanation for you did manage the 14.5 sec. run, though. Maybe the Vanos solenoid isn't opening/functioning within its complete range?

I don't think a 30 min cool down period between runs would really lower engine temps to the point where you could call the second run a "cold" run. The 30 min drive to the track and the WOT run would/should have oil and water temps at their operational temperatures. It would take much longer than 30 mins to lower water temps to cold. Oil temp is more varied, but maybe I'm wrong.

The fan clutch is an easy and cheap to replace.


. In my case, I didn't even need the water pump pulley holder. I was able to fit long screw driver between the bolts.
Jump to top abcurran is offline   Reply With Quote
Old Tue, Oct-03-2017, 06:24:18 PM   #19
betrezra
Registered User
 
Join Date: Nov 2016
Posts: 310
Reputation: 0 betrezra is on a distinguished road
Location: Houston

United States




Default Re: E36 m3 5.5k rpm loss of power when hot

For proper diagnosis you need some data..... there are cheap OBD connector loggers so can can log the following VS Time on your runs:

1 - IAT
2 - Timing
3 - RPM
4 - coolant temps
5 - st and lt fuel trims (assuming this vintage has such things)
6 - O2 sensor voltage

Add'l bonus if you add an O2 sensor... and can track AFR real-time.
Add'l bonus if you add a fuel pressure sensor... and track real-time.
Add'l bonus if you can pull some codes for other potential faulty sensors.

Will tell you:
* fuel delivery issue?
* AFR, IE tune issue?
* timing / tune issue?
etc.. etc...

Other causes of lost of MPH @ Track:
1. State of repair..... dirty airfilter? old sp plugs? gapped wrong? bad fuel?
2. poor Air.... DA..... you can look this up. Makes a big diff even on na cars.

good luck with your search for powa!
__________________
E36M3
Jump to top betrezra is offline   Reply With Quote
Old Tue, Oct-03-2017, 07:18:42 PM   #20
pbonsalb
Registered User
 
Join Date: Jun 2005
Posts: 3,383
Reputation: 0 pbonsalb is on a distinguished road





Default Re: E36 m3 5.5k rpm loss of power when hot

Quote:
Originally Posted by abcurran View Post
Or cam sensors. It sounds like something is retarding the timing above 5.5K RPM on the "hot" runs. I wish I had an explanation for you did manage the 14.5 sec. run, though. Maybe the Vanos solenoid isn't opening/functioning within its complete range?
.
I think the vanos retards at high rpm to add top end power. This is also the default. If vanos does not work, it typically retards and the lack of 1000-5000 rpm advance softens power in that range. Top end power would be unaffected.
Jump to top pbonsalb is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT. The time now is 02:40:02 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
M3Forum.com and M3forum.net is in no way sponsored, endorsed or affiliated by or with BMW NA / BMW AG or any of it's subsidiaries or vendors.
BMW and M3 (E90 M3 | E92 M3 | E93 M3 | E46 M3 | E36 M3 | E30 M3) are registered trademarks of BMW AG.
M3Forum Terms of Service
Copyright 1999-2017 M3Forum.com
Discussing E36 m3 5.5k rpm loss of power when hot in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)