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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-16-2010, 06:26 PM
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540cmc 540cmc is offline
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Dyno question for autos

I'm thinking about another dyno test to see the change (if any) from stock with my current mods in place. For the curious, totally stock numbers were 243.7 HP / 282.1 TQ, taken on a Dynojet.

The problem I ran into the first time was the inability to start the run at a low rpm. As soon as we went to full throttle, it downshifted. This made it hard to get a nice pull fron low RPM since we had to stay out of full throttle until RPMs were above the kickdown point.

Does anyone know how to prevent the auto kickdown? Maybe a connection / fuse I can pull? Any help would be appreciated!
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  #2  
Old 01-16-2010, 06:35 PM
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bmw_n00b13 bmw_n00b13 is offline
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Don't hit the kickdown button, of course. No fuses afaik. A GT-1 might be able to control which gear is selected. Don't you have steptronic? Step will keep you in the gear unless you hit the button or go to slow.
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'99 528i ('98/12 build). 174,000km BY29428/Royalrot
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  #3  
Old 01-16-2010, 06:50 PM
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540cmc 540cmc is offline
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Yes, I have the steptronic, but as you point out, if you go to full throttle you hit the kickdown button. I had hoped the Dinan trans SW that allows me to hold a gear would prevent this but it doesn't.
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AFE intake, Stage 2 Dinan software, M62 intake, Dinan trans SW, 3.64 limited slip, Michelin Pilot Super Sports 265/35/18 all around on 18x9 Style 37 wheels, SuperSprint headers, Magnaflow 3" exhaust, Dinan Springs, M5 rear sway bar, Dinan strut bar, SS braided lines, Technical Graphite interior trim, M5 deadpedal, Titanium Silver / Grey, Black side moldings, M-Tech rear bumper, debadged.
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  #4  
Old 01-16-2010, 07:44 PM
Waveho Waveho is offline
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My dyno results with only a MagnFlow is below. If you want a faster 540i, then get a non-VANOS 1998 540i-6. (267.5 max hp, 295 max torque at the wheels on DynoJet) Forget the auto....
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  #5  
Old 01-16-2010, 07:53 PM
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Mein Auto: '97 540iA
well, i dynoed in 3rd (in my auto 4th is 1:1) and got 281rwhp. dyno brand was superflow and it was a 65 degree sunday morning. maybe dynoing it in 3rd did it, what do you think?
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  #6  
Old 01-16-2010, 09:06 PM
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bmw_n00b13 bmw_n00b13 is offline
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Full throttle happens before kickdown, afaik. Or remove the button.
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'99 528i ('98/12 build). 174,000km BY29428/Royalrot
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Mods: Stoptech SS brake hose, 280piece toolkit resting on trunk floor, Beisan VANOS seals
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  #7  
Old 01-16-2010, 09:16 PM
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540cmc 540cmc is offline
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Waveho, if I really wanted a faster 540, I'd get a supercharger. Since mine was paid for long ago, I'll just play with this one, even if it is an auto! Nice numbers though.

Orxan4ik, most dyno operators suggest running in the gear that gives closest to 1:1 ratio. I believe running in a lower (higher numerically) gear gives a false higher reading.

Dynojet, Mustang and SuperFlo dynos all seem to give slightly different readings. However, from what I've seen, pre-vanos 540s tend to post better numbers than the later ones.

I think one reason is the bigger intake. I've got one that's going on soon so we'll see if that makes a difference. (crosses fingers) I'll keep you posted.
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AFE intake, Stage 2 Dinan software, M62 intake, Dinan trans SW, 3.64 limited slip, Michelin Pilot Super Sports 265/35/18 all around on 18x9 Style 37 wheels, SuperSprint headers, Magnaflow 3" exhaust, Dinan Springs, M5 rear sway bar, Dinan strut bar, SS braided lines, Technical Graphite interior trim, M5 deadpedal, Titanium Silver / Grey, Black side moldings, M-Tech rear bumper, debadged.
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  #8  
Old 01-17-2010, 04:35 AM
mujjuman mujjuman is offline
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I dont own an auto BMW, but doesnt the car downshift even if you dont hit the kickdown switch? (when the pedal is pushed lower but not kickdown)
This happens in VWs and Audis
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  #9  
Old 01-17-2010, 06:24 AM
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bmw_n00b13 bmw_n00b13 is offline
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Quote:
Originally Posted by mujjuman View Post
I dont own an auto BMW, but doesnt the car downshift even if you dont hit the kickdown switch? (when the pedal is pushed lower but not kickdown)
This happens in VWs and Audis
Not with step, at least that's the theory. It would be very frustrating otherwise.
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  #10  
Old 01-17-2010, 06:34 AM
mujjuman mujjuman is offline
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Quote:
Originally Posted by bmw_n00b13 View Post
Not with step, at least that's the theory. It would be very frustrating otherwise.
YOu should try it, if you have step.
My auto Jetta also has a kickdown switch, which downshifts like 2 gears or 3, or 4... otherwise, when i floor it without hitting the kickdown, the car only downshifts 1 gear, maybe 2, depending on speed.
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  #11  
Old 01-17-2010, 06:42 AM
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bmw_n00b13 bmw_n00b13 is offline
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Last time I drove my grandfather's step it wouldn't upshift/downshift in 3rd gear unless the button was hit, but it was a while back, which is why I didn't say anything more definite.
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'99 528i ('98/12 build). 174,000km BY29428/Royalrot
Breaking My Wallet since 2009
Mods: Stoptech SS brake hose, 280piece toolkit resting on trunk floor, Beisan VANOS seals
'99 540i (grandfather's)


Last edited by bmw_n00b13; 01-17-2010 at 06:55 AM. Reason: upshift, downshift, same thing
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  #12  
Old 01-17-2010, 06:51 AM
mujjuman mujjuman is offline
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Quote:
Originally Posted by bmw_n00b13 View Post
Last time I drove my grandfather's step it wouldn't upshift in 3rd gear unless the button was hit, but it was a while back, which is why I didn't say anything more definite.
interesting. i'm guessing you mean downshift though.
i only drove a few auto BMWs... but it wasnt really for test drive. it was to move friends/family cars around. so basically it was low speed driving lol. barely touched the gas.
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  #13  
Old 01-17-2010, 07:24 AM
chucksrt chucksrt is offline
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Quote:
Originally Posted by 540cmc View Post
Orxan4ik, most dyno operators suggest running in the gear that gives closest to 1:1 ratio. I believe running in a lower (higher numerically) gear gives a false higher reading.

Dynojet, Mustang and SuperFlo dynos all seem to give slightly different readings. However, from what I've seen, pre-vanos 540s tend to post better numbers than the later ones.

I think one reason is the bigger intake. I've got one that's going on soon so we'll see if that makes a difference. (crosses fingers) I'll keep you posted.
Most dynometers do not need to be 1:1 for the results. It would be great if you could run true 1:1 but all cars have a diff and most gear ratios differ so that would never be possible.

A pre-vanos intake should jump you up 15hp without any other mods you will get more from it with the proper tune.

here are my baseline #'s for my 99 540/6 on a Dynocom Dyno:
pull in 4th gear 275.5hp@ 5350rpm and 338.7 ft-lbs tq @ 3650rpm
here are the #'s after the pre-vanos intake and 24# injectors:
281.0HP @ 5250rpm and 348.7 ft. lb. tq @3650rpm
I ran very rich with the larger injectors and the Dyno operator said with a proper tune I should pick up 10 more hp
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Old 01-17-2010, 07:29 AM
mujjuman mujjuman is offline
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with the bigger injectors, did you have to tune your ECU?
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  #15  
Old 01-17-2010, 07:44 AM
chucksrt chucksrt is offline
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I should have !!! But I have not done it yet. The DME made corrections for it pretty well but when on the dyno as soon as the rpm went above 3600-3800 the DME could no longer handle the extra fuel. I have some goodies to put on it and once everything is installed I will send it out for a tune.
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  #16  
Old 01-17-2010, 07:48 AM
mujjuman mujjuman is offline
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Oh I see... so what happens after those rpms?
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  #17  
Old 01-17-2010, 07:54 AM
chucksrt chucksrt is offline
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Fuel ratio went up over a point and power started to drop off. I will find the Dyno sheet and post it.
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  #18  
Old 01-17-2010, 07:56 AM
mujjuman mujjuman is offline
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oh... so was power after that point lower than stock?
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  #19  
Old 01-19-2010, 04:06 PM
chucksrt chucksrt is offline
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Here are the dyno results. One of the sheets show my baseline numbers and the other shows the results after installing the pre-vanos intake manifold and 24# injectors. I have another sheet with the full set of runs on it from the second set but I can't find it.
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