E28 Dyno Database

[Brad D.]

BMW e28 Dyno Database

The goal of this thread is to collect as many dyno plots of various e28s in one place for future reference. This gives everyone a good database of plots for various mods, boost levels and engines. I have dug through the forum and found a good selection of plots and have included a few notes regarding each setup. These are from various users, some who no longer post here or who are inactive. If any of these dyno plots are yours and you have a more current plot you would like to include please post it and a short list of mods. Since I cannot do an extensive list of mods for each plot, it would be beneficial for that user to chime in with a post of their own plot and a list of mods. I will then remove the repeat image from this initial post. Remember, that some of the plots show uncorrected power while some show SAE or STD corrections. The type of dyno will also color the wheel horsepower number. Take each plot with a grain of salt when comparing them. The plots appear in no particular order but have been separated into forced induction and naturally aspirated categories. Enjoy and get to posting up your plots!

Forced induction



Owner: Big Bronze Rim - My own dyno from November of last year. This is on an turbo m30b35. Boost level was about 8.5 psi.


Owner: grsmonkey – this is at 10psi on a TCD S2 kit with a built b34 block with a b35 head.


Owner: Jeremy – Running a TCD S1 kit non-intercooled at 10psi.


Owner: turbodan – 528e with ‘i’ head and .86AR GT2871 turbo


Owner: RussC – Running a original Dinan Turbo kit at 10 psi falling to 8 at the end of the run. The engine is a m30b35 with chip tuned Motronic 1.3 and FMU.


Owner: Russianblue – 528e with ‘i’ head, Ireland Engineering 272 cam MS running around 13.5psi



Owner: TCD – car is a 745i at 1 bar of boost with a chip and FMU.


Owner: TCD – I believe this plot is from an e34 (m30b35) at 8psi



Owner: red535t – e34 with an m30b35 and custom turbo system at 15psi.


Owner: N/A – press release dyno plot comparing a stock 745i to a 735i


Owner: TCD – TCD S2 kit with MLS HG and studs running 17psi


Owner: GragATL – this engine has a b35 head and was running 14 psi but boost fell to 9psi at the end of the run. Hopefully Greg has an updated plot.



Naturally Aspirated



Owner: Jeremy – b34 with a TCD CAI and a Metric Mechanic Exhaust


Owner: Duke – euro e28 with a worked Hartge head and cam, headers, chip and S-AFC


Owner: Brent in NZ Hartge 535i - this is an M5 with an s38


Owner: Alpina740 – b34 with K&N filter and a Dinan chip


Owner: M5BB – built s38 in an M5


Owner: MAJSU WuWuA – euro b34 with K&N panel filter



Owner: Peter Florance – b34 running MS1 and a euro 528i exhaust (smaller piping)


Owner: ShawnD – high mileage b34 with a D’Sylva chip and custom Magnaflow 2.5” exhaust


Owner: Martin Bacon – e34 (m30b35) stock dyno


Owner: gary242 – b35 with Schrick 284 cam and Paul LaDue headers


Owner: jcbe34 – built 3.6L m30 with a 290 cam


Owner:Bob – e30 ‘335i’ with an m30b35 swap running a Conforti chip


Owner: Dinan – press release dyno for Dinan’s chip gains

[Jeremy]

This thread could prove invaluable. Please restrict responses to additional dyno information. If necessary, I'll remove responses that don't belong.



Already posted, but more information: 17psi, TCDs2 with larger intercooler, and Megasquirt standalone.

Jeremy

[lito]

[Duke]

Duke's M535i - FI, TCD S2 kit, 7.5 PSI. B34 with Hartge H6S head.

[Good & Tight]

B34 14psi stock engine, Megasquirt.


Same engine, w/Shrick 284/280 cam MLS, headstuds, 17psi,
E85. One fuel pump died so the AFR's are very lean.



Both pumps working E85 18psi




E85 24psi spike, boost dropping to 18psi at the end of pull, maxed out HX40. HX55 in the works.

[olNick]

Hi,

Dynoe'd friends E30 with B34 yesterday...
WTF is going on? Will post on tech forum...








later,

nick

[jmc1590]

'87 528e (12/86 build), e2i convertion, eta pistons and exhaust.

[bm0p700f]

My e to i conversion

Motronic 1.3 + chip
885 head on 10.2:1 eta bottom end giving a CR of 9.35:1
325i intake manifold and injectors
325i AFM
3.0 bar FPR
Manual gearbox

Figures are rear wheel.



Problems include a low AFR above 4800 rpm (it goes below 12:1) which conicides with the drop in torque. But torque seems a bit low at peak and starts to drop too early.

[Wildstoats]

My M30B34. Around 80,000 miles on the engine. Bone stock with an unknown level of maintenance. This dyno run was right after I got the car.

Graph was generated using a Mustang MD-AWD-1100-SE dynamometer. I don't remember the environmental specifics but it was probably in the mid-70s.

[E30SPDFRK]

Stock b35 with no muffler. 240k miles original everything

[12valves]

M20...

Started with only 140rwhp and it was running lean, so we fudged the AFM. That gained a few horses and ft*lbs. Then we swapped ECUs, from an 007 box with tweaked advance timing to an 027 box with a tweaked version of Dinan's eta chip. That gained a bit more, mostly torque, but the motor is still hungry for more fuel at full power.
'82 528e - 325i head, intake, TB, FPR, forged 9.1:1 pistons, headers, 2.5" exhaust

[turbodan]

M20...

Started with only 140rwhp and it was running lean, so we fudged the AFM. That gained a few horses and ft*lbs. Then we swapped ECUs, from an 007 box with tweaked advance timing to an 027 box with a tweaked version of Dinan's eta chip. That gained a bit more, mostly torque, but the motor is still hungry for more fuel at full power.
'82 528e - 325i head, intake, TB, FPR, forged 9.1:1 pistons, headers, 2.5" exhaust

Doesn't look like its leaning out. I dont know what kind of 007/027 chips run to 6500, but I would wonder if whoever increased the revlimit retuned the ignition advance tables. Should be cranking up the advance as peak power starts to drop off and as revs climb.

[12valves]

It's hard to see on the graph but AFR was around 13:1 just below 4K RPM, and increased slow but steady after that. Notice at the power peak that the AFR is 14.24:1, is that lean enough for ya? I had set the timing a bit low because of pinging at 5K RPM, the same in both chips... or so I thought. But the 2nd ECU definitely made more power. I think it may be because the chip in the 007 ECU has no separate map for WOT ignition timing but the 027 ECU does, so timing was not what I thought. The AFR was the same with both ECUs. The only other thing I can think of is dwell and I don't know if that is controlled via software. Also it looks like Dinan disabled the rev limiter entirely. I got an adjustable FPR to take care of the fuel problem, and a USB oscilloscope to do some data logging and learn more about tuning the Motronic. Unfortunately something's wrong with my driveshaft now and there are other annoying, mundane issues to work on :)

[turbodan]

Thats not lean enough to cause a dramatic drop in power. AFRs affect power output much like changes in air density. They wont reshape the power curve.

I can say for sure that Dinan didn't just disable the rev limit. Eta chips cut out at 5300.

[turbodan]

Update

GT3582R .82
Pump gas, max boost ~22 psi

[red535t]

red535t, e34 m90b35 lightened crank,forged pistons,bored /
stroked,warm cam,porting
head studs and custom manifolds
10lb wastegate spring


just editing your earlier post
e28 m30b35 best of every secondhand part i had.
log manifold,15psi wastespring

great thread,10 points

[BigMac]

It made 183whp/194wtq on the next pull after this one. Not a huge difference, but figured I'd note that.


Details: M30B34 w/ ported/polished head, valve grind, custom grind cam, TCD cais, and Turner/Conforti chip.

http://www.youtube.com/watch?v=eLwZacMvzNk

[T_C_D]

m30b35 with 8.0CR at 13psi

TCD kit, MS1 ECU

[bm0p700f]

double post

[bm0p700f]

Current spec 195,000 miles
Euro eta block with 885 head giving a CR of 9.35:1 (not rebuilt)
325i inlet manifold.
325i throttle body.
Stock air box.
E30 325i exhaust manifold.
E30 325i down pipes mated to 535i down pipes.
Frtiz Bits E28 exhaust system.
Motronic 1.3 with a custom rolling road mapped chip.
Manual gearbox
3.46:1 open final drive.
225/50R16 wheels and tyres

This dyno results come from a different rolling road to my previous plot.

Peak whp is 123.4*, I have been given estimated flywheel figures - shame. I do not have a wheel torque curve but drive train losses are running at 21.5%. So you can work them out.
* these numbers appear too low however - please read on.



If I calculate (using the wheel power numbers) the acceleration from 30-70 mph in 3rd gear and the 50-75 mph time in 4th gear, factoring air resistance, rolling resistance and the measured weight of the car, I find the wheel power (and consequently the torque) figures 11% to low.

I have measured the 30-70mph time to be 11.4 secs and the 50-75mph time to be 12.1 secs. The spreadsheet I use to calculate this spits out 13 secs and 14.4 secs respectively, quite a difference. If I raise the wheel power/torque fiues by 11% I get the times I measured.

So peak wheel figures should be 137 hp @5900 rpm and peak wheel torque 142 ft.lb @4200-4500 rpm. I am certain I have set up the spreadhseet correctly and Physics doesn't lie, it's a pretty simple problem.

So fitting this exhaust system has lost me some low end grunt (I feel this) but increased the rpm at which peak power was developed. My last dyno plot, see an earlier post, which was accurate it turned out and showed 145 ft.lb @3900 rpm and 125 hp @ 5250 rpm using stock eta exhaust system.

Overall the car is more drivable as I can hold a gear for much longer. It pulls strongly now all the way to past 6000 rpm where as before it fell flat on its face above 5500 rpm. So not withstanding the odd figures the stock eta exhaust system is a restriction on these 2.7i motors and should be ditched for something more free flowing if you want more of a top end.

[Gunni]

Hey Malcolm

I did another 2.7 yesterday

M20B27 with 731 head and 323i camshaft, rest is 325i stuff and hot tune headers and a Miller MAF conversion.

I tuned from a 173 chip as the Miller chip had some of the maps moved around and I couldn´t be bothered finding them yesterday.

This is his dyno chart

[Jeremy]

For the love of ...

Could you guys please get those graphs done with equal scales for hp/tq (whatever units you use for torque, just don't use one scale for one and another for the other!), and rpm as the x-axis?

Wheel speed is nearly useless when looking at these things.

Jeremy

[bm0p700f]

I think you'll find Jeremey, rpm is stated on the x-axis and that the power and torque y-axis scales are the same.

Gunni, those are the numbers I would expect from a basic build 2.7i, although his spec has a higher compression ratio, headers and a MAF. Maybe all those things make the difference. Oh he also has the 320i/323i cam in there and that made a big difference over the 325i cam he had inthere previously.

[Gunni]

Yea

His compression test numbers where 16bar or so, which is just the highest I´ve seen yet.

I measured his manifold pressure for giggles and it was positive of about 0.05bar below peak torque and less then atmospheric above peak torque crossing at 0.0bar at peak torque.

I think the throttle body he´s using could be to blame.

[FirstFives Dictator]

1980 E12 M102 block TCD S2
PFTuning MS system. Electronic boost control etc.

T04e
60 trim comp wheel
S trim turbine
.58 exh housing

Paul Burke cam (early prototype)

1 bar boost