E46 330i Automatic - M54B30 Turbo

[Commanderwiggin]

So many threads are now lost due to JunkBucket...such a shame really but nobody will blame you for cancelling.

[PEI330Ci]

I've been thinking about this a little bit....and it's almost as if there is a conspiracy to move content off of forums, and into other social media platforms that are the new focus of ad revenue....

If I wanted to force people to use F***Balls....this would be a good global strategy.

Who owns F-bucket?

[danomite]

I would like to make 1000chp.

The current record is 800whp...but the owner of that car passed away last month....

On a completely different topic....

Starting to consider that wheel hop might be partially caused by the back of my car being too low and too soft. ----wheels getting sucked upwards under traction, spinning, then falling back down until re-gripping, and repeating the cycle.

Wait! WHA?!?!?! Are you talking about Jimmy in Sweden???

[PEI330Ci]

Wait! WHA?!?!?! Are you talking about Jimmy in Sweden???

No....it was Fredrik.

Jimmy just bought a P-car....

[euro2fast4u]

Who owns F-bucket?

It was bought by Ontela. but this company seems fake. cover up for the real owners, fbook?

[PEI330Ci]

Edit Nov.12: The values below are wrong...see post further down for corrected numbers.

While looking at acceleration data from my drag strip passes, I found the following:

First gear: Average of 1.63G (Spinning much?)
Second gear: Average of 1.85G
Third gear: Average of 1.19G

Once I get this thing to hook with an LSD....I'm pretty confident to achieve 2+G on launch.

What is pretty amazing, is that the Street Outlaw guys launch at 3G on the street!

[AlexQuattro]

How bad is your wheel hop? Planning on trying stiffer springs?

[PEI330Ci]

How bad is your wheel hop? Planning on trying stiffer springs?

We'll have to wait and see. I do have more springs....

I also might be moving to a different transmission and tire combo.

[wazzu70]

It would be interesting to put an accelerometer on the suspension arms so you can plot their direction and acceleration relative to the chassis.

For automotive body design you can 3d print a base for the accelorometer to hold it in plane at static position on the shake rig and you can see how the actual motion matches your modal model if you are getting unexpected results or to benchmark simulation accuracy. I think its safe to assume you have another i/o channel or two available.

[hsvturbo]

While looking at acceleration data from my drag strip passes, I found the following:

First gear: Average of 1.63G (Spinning much?)
Second gear: Average of 1.85G
Third gear: Average of 1.19G

Ermahgerd, if my car pulled at 1.19Gs in third gear, I would be putting down 778 ft-lbs of torque at the wheels.

[chikinhed]

If the car has no anti squat due to lowering and soft springs couldn't that be a possible cause of wheel hop?

[Kevin325i]

While looking at acceleration data from my drag strip passes, I found the following:

First gear: Average of 1.63G (Spinning much?)
Second gear: Average of 1.85G
Third gear: Average of 1.19G

That's already impressive. Is that from accelerometers or are you calculating?

Honestly I would not expect the average that high, could see the peaks up there though for sure. What are the peaks you're seeing if this is accelerometers?

[jakermac]

Adam,

You do know there’s a plug in fix for Chrome and Firefox to re-enable the viewer’s access to your photos, right?

[PEI330Ci]

It would be interesting to put an accelerometer on the suspension arms so you can plot their direction and acceleration relative to the chassis.

For automotive body design you can 3d print a base for the accelorometer to hold it in plane at static position on the shake rig and you can see how the actual motion matches your modal model if you are getting unexpected results or to benchmark simulation accuracy. I think its safe to assume you have another i/o channel or two available.

I've had 2 linear position sensors for the rear suspension sitting on my shelf since August....and yes I do have more I/Os available. I also have a string pot for the clutch pedal....also on the shelf....

That's already impressive. Is that from accelerometers or are you calculating?

Honestly I would not expect the average that high, could see the peaks up there though for sure. What are the peaks you're seeing if this is accelerometers?

I was calculated, and my math was wrong.....

I actually have 3 sets of 3 axis accelerometers on the car inside of various Motec devices....but the devices aren't mounted in a way that it would be useful. I've got a 3 Axis accelerometer from Texsense (+/- 5 G) going on the car when I have the time this winter.

Adam,

You do know there’s a plug in fix for Chrome and Firefox to re-enable the viewer’s access to your photos, right?

Yes, I posted it in another thread....maybe I should post here.

- - - Updated - - -

Correct Calculation:

First gear: Average of 0.90 G
Second gear: Average of 0.82 G
Third gear: Average of 0.53 G
Fourth gear with nitrous: Average of 0.32 G
Fourth gear after nitrous off: Average of 0.18 G

[milKt]

Adam,

You do know there’s a plug in fix for Chrome and Firefox to re-enable the viewer’s access to your photos, right?

Thank you MUCH.
Works wonders.

just google "photobucket embed fix"

and add to your browser

[Kevin325i]

Correct Calculation:

First gear: Average of 0.90 G
Second gear: Average of 0.82 G
Third gear: Average of 0.53 G
Fourth gear with nitrous: Average of 0.32 G
Fourth gear after nitrous off: Average of 0.18 G

Yeah that seems more right for averages.

Not sure if you're set on that string pot for clutch position or not but clutch pressure can be a better representation of what's going on. It's just easier and you see position of release when pressure stops ramping.

Could toss the string pot on the steering shaft for steering angle if you don't have that already.

[PEI330Ci]

I have major boost creep with the GTX40 on the Steed Speed.

With a 10.5 PSI WG spring:

10 PSI @ 4000 RPM
21 PSI @ 5500 RPM

I've got a boost cut limiter at 21 PSI.....so I can't rev the car out.

Double checking WG line connections before I go any further with this. I've also got a WG position sensor on the shelf that I've been debating to install....

[chikinhed]

You will need to put a WG on the turbine housing or use real man boost with the Steed TS manifold.

[someguy2800]

I would find it irresistible to start cutting on my new $1200 manifold and fix it. Either that or I would weld her up and put the gate on the turbine housing like mentioned.

[PEI330Ci]

You will need to put a WG on the turbine housing or use real man boost with the Steed TS manifold.

I'm going to raise the boost cut threshold and see where the creep ends....

If it holds under 24 lbs......I might look at using the DBW throttle to control boost in each gear. (Limiting the throttle position based on RPM and gear position)

[chikinhed]

Just using the Tial EWG with my EFR 9180 I lifted through 26 psi, it showed no signs of slowing down or stabilizing at that boost. The IWG can keep it under control at 13 psi. The Steed WG port area is really small with that ~1/4” divider in there and the exhaust has to do a sharp 90° bend to get out. A smaller turbo with higher back pressure and not trying to bypass as much exhaust would probably work better with this manifold if you can’t use an IWG.

I still have the issue of boost taper, from 25 psi down to 18 psi, but I’m sure a 4-port solenoid will time that right up.

[Butters Stoch]

I use pop off valves to keep me under 25#. Works like a champ.

Sent from my E6782 using Tapatalk

[PEI330Ci]

Just using the Tial EWG with my EFR 9180 I lifted through 26 psi, it showed no signs of slowing down or stabilizing at that boost. The IWG can keep it under control at 13 psi. The Steed WG port area is really small with that ~1/4” divider in there and the exhaust has to do a sharp 90° bend to get out. A smaller turbo with higher back pressure and not trying to bypass as much exhaust would probably work better with this manifold if you can’t use an IWG.

I still have the issue of boost taper, from 25 psi down to 18 psi, but I’m sure a 4-port solenoid will time that right up.

I love this turbo....not going smaller.

I use pop off valves to keep me under 25#. Works like a champ.

It could work, but then I'd be concerned with over-speeding the turbo.....and of course....all that pre-turbo water/meth I'd be dumping into the atmosphere.

Capping the SS WG port with a machined SS disc,(keeping the Tial Clamp in place) and running a WG off of the turbine housing is looking like a lot more reasonable solution.

[Butters Stoch]

I love this turbo....not going smaller.




It could work, but then I'd be concerned with over-speeding the turbo.....and of course....all that pre-turbo water/meth I'd be dumping into the atmosphere.

Capping the SS WG port with a machined SS disc,(keeping the Tial Clamp in place) and running a WG off of the turbine housing is looking like a lot more reasonable solution.

Idk, turbos like mine and yours are designed for big boost. You will be bleeding off maybe 2-3psi. I've ran mine to redline and it made like 27psi using a Tial gate. So, the gate can control to 27 and you need to bleed off 2#. GTX4088 is meant to spin up. Supra guys have ran 35+ with a 6466 so, I don't think overspinning would be an issue. Or take it all back a part, and try to divide that twin scroll housing for a gate.

Sent from my E6782 using Tapatalk

[PEI330Ci]

Ran the car with a 25% limit on the DBW...and it was a DOG!!! I couldn't believe how little power it had.

Bumped the DBW up to 50% and it was better, but still pretty soft.

65% gives me OK response, and the manifold pressure holds at 11.5 - 12 PSI once it's spooled.

Going WOT (65%) at 3400 RPM in 3rd gear:

12 PSI @ 4800 RPM

Once the engine hits 5200 RPM though.....the tires start to spin. (In 3rd) I'm dealing with a cold and wet road today.....