84 533i turbo build thread

[r.martin]

Marc, Thanks for your feedback, nice to hear that others are as interested in this project as I am.

What are your plans with the intake? I would mock up all the powersteering stuff before starting on the intake. Maybe its just the camera angle but it seems like the blower is mounted fairly low. I would aim for a fairly straight shot from the output of the blower to the intake port.

Do you have back up plans for a dipstick? you could probably heat the tube up and bend it so you can access

Hey Mitch, if you look back on the first page of this thread, you'll see that I have converted the steering to a manual rack and pinion, therefore no PS pump. As far as the intake manifold your point is valid, however I have some components that need to fit between the blower and the head hence the low positioning. It will be obvious once they arrive and I can get fabricating.

I am up in the air about the dipstick as I need to finish the intake first, I could modify the oilpan to take a dipstick, or go drysump and check the oil level at the tank.

[r.martin]

Props to everyone who told me how difficult this would be, there are a hundred tiny things that have to be redesigned. making progress have the blower nearly in its final position, working on the tensioner, then time for the manifold nightmare.

[mitch5]

Props to you for continuing on, your build will be more about the fun of getting to the end rather then ever getting to the end. This endeavor has the makings of the guy over on grm with a ferrari 308, one of the best build threads i have ever seen

https://grassrootsmotorsports.com/forum ... 959/page1/.

People including myself love pictures so keep updates coming. If you have pictures people are more likely to respond of give feedback.

[r.martin]

Props to you for continuing on, your build will be more about the fun of getting to the end rather then ever getting to the end. This endeavor has the makings of the guy over on grm with a ferrari 308, one of the best build threads i have ever seen

https://grassrootsmotorsports.com/forum ... 959/page1/.

People including myself love pictures so keep updates coming. If you have pictures people are more likely to respond of give feedback.

Thanks Mitch! I really love the guys on this forum, such a genuine and good community. It definitely is about the journey at least at this time. I am blessed to have no time crunch and to be able to build this exactly as I want it. I spoke to a my new fabricator, describing what I want for the intake manifold, if we can pull it off, I will have something really beautiful for you guys.

For now I do have some new photos of some small but crucial parts that were just made.

Water pump delete, in favor of an electric pump there will be coolant pipes fitted once I have a better idea of the cooling setup.

[r.martin]

So I have run into a packaging issue, and may have a solution if I can re locate the injectors. our manifold will not be this specific design, but has anyone ever seen injectors placed like this? My tuner is concerned that at high RPM when the valve closes, a shockwave will occur spitting the fuel back out of the trumpet. Can anyone back this theory?

[mitch5]

I am not sure about a shockwave occurring and thinks thats a lesser worry with just this being a bad design, which is probably why it is just a rendering. Carbs and tbi inject fuel way farther away from the valve and operate fine. This setup would just not be very efficient, having the injector in the pleum would result in very uneven fuel to the individual cylinder. You want to have a tuned port inject TPI not throttle body injection TBI setup. TPI is way more efficient and that is why it requires atleast one injector per cylinder. Not to mention fabricating that would be a nightmare.

So your real issue is packaging, what is getting in the way of the injectors in their stock location?
Is the distance between your blower and intake port to short?
Is something going on top of them?
I ask because the stock location of the injectors is pretty good in terms of packaging.

[Nebraska_e28]

Nice progress! You definitely have some determination.

I've been plotting an m90 build for a while, but have yet to make time. I'll be curious to see intake design. No use in me recreating the wheel if you can pull it off.

What compression ratio are running?

[r.martin]

Thanks guys for the info, I think that I may have a slightly more traditional solution that is packaged better.

Nice progress! You definitely have some determination.

I've been plotting an m90 build for a while, but have yet to make time. I'll be curious to see intake design. No use in me recreating the wheel if you can pull it off.

What compression ratio are running?

I'll share full details of the intake design once it is underway, we are running 7.9:1 CR

On a side note I had a little extracurricular excursion and made this purchase:

2014 MV Agusta F3 800

[r.martin]

To all who are awaiting developments on this project know that I haven't quit. The scope of this as well as other things has necessitated a stand alone shop rather than working out of my father's garage. This may be uninteresting but I felt that I owed you guys an explanation.


Setting up racks for a mezzanine office space

My right hand man, kind enough to offer his truck

[Shadow]

this thread feels years old already.

so on that damper thing do they sell water/alt pulleys for it or is that something
you just have to custom make?
looks cool might be the ticket to rev out the m30 but not like that m30 makes power past 5.5 anyway.

[r.martin]

this thread feels years old already.

so on that damper thing do they sell water/alt pulleys for it or is that something
you just have to custom make?
looks cool might be the ticket to rev out the m30 but not like that m30 makes power past 5.5 anyway.

Like most projects I've had, they seem to go far longer and far more expensive that anticipated, I really want to drive it this summer. Still building out the shop but making quick progress on that actually. The MRT damper adapter kit is just the adapter and trigger wheel, you choose your own ATI damper and are left to make it work, I'm sure that you could adapt some of the shelf pulleys with a little work.

[r.martin]

My apologies to all who are feeling that this thread is dragging on. I know that is always a frustration of mine when following someone else's project. So as of now, the e28 has been moved to the new shop, we have a lift installed and our electric finally figured out so we can run the welders. I have made a new association with a CNC shop that makes aerospace components, my point of contact was able to pull dimensions from my hand built supports for the supercharger, so we are making headway on that. Still setting up my office so that I can do the CAD work needed.





I used the original seats to make a matrix style workstation. I still need to finish the foot rests but it is working nicely so far.



Here are some sample pieces that my contact at the CNC shop has made, the quality is more than adequate for our needs.

[Tiit]

Thanks for the update.

[r.martin]

Alright guys, I am determined not to become another story of a guy with ambitions who talks then disappears. This past year has brought a lot of change, moving, new job, etc. but the e28 is constantly on my mind, I have continued to play around with my hand made blower mounts and the pulley is always off by a few degrees, determined not to scrap the blower I have decided to remake all of hardware that attaches to the block. I have a new idea of how to make the mounts and have designed it in freeCAD which I am not excessively familiar with, need to figure out how to get it to print to size so that I can verify the bolt holes line up with the block before I take it to the waterjet cutter.
Sorry to keep you guys hanging.

[Tiit]

Keep going

[r.martin]

Thanks man, little bits of encouragement really help.

[r.martin]

I've had a company with a plotter print the dxf file as not to burn any more time, got an email today saying the drawing has shipped out. Hopefully we are gaining back our momentum.

[r.martin]

Ok so I have decided to post several pics as soon as I have a major update for all of you to break my cycle of "hey all, I've done this relatively miniscule task, click here"

I have been figuring a bunch out, I've successfully made the template for the baseplate and got it to line up, I ended up buying a new blower, still an eaton M90 but one with a much shorter body that will be easier to fit. Got a starter from an e34 which should provide more room to work with.

Now my question is how short can I make the intake runners? I feel like they have to be at least long enough to allow for a decent injector angle.

[marc79euro645]

The m30 is not a high revver. I would embrace the low end torque with long runners. I also think you should consider upping compression. I had an m102 with 7.5:1, what a dog!
have fun,
marc

[r.martin]

Thanks Marc, that is really good to know. I was hoping to overcome the low compression with the blower, which is typically used on 3.8-4.0L engines. My compression is similarly ~7.5-1. I really should do the math to determine what the effective compression with the blower is. Not exactly sure how to do that, maybe I can find a calculator somewhere. So when we are talking about "long" runners what would be considered long?

[r.martin]

Thanks Marc, that is really good to know. I was hoping to overcome the low compression with the blower, which is typically used on 3.8-4.0L engines. My compression is similarly ~7.5-1. I really should do the math to determine what the effective compression with the blower is. Not exactly sure how to do that, maybe I can find a calculator somewhere. So when we are talking about "long" runners what would be considered long?

[marc79euro645]

Yeah, thats above my paygrade. I suppose you could measure a stock intake runner and use that as a guide. Plenum size also plays a big part of the design, but, I don't know enough to tell you what size. Higher compression will give you better bottom end power, giving blower a chance to get going. I'm using an adjustable cam gear to advance cam after milling head. That's the cheapest, easy-ist way to up compression. You should clay the piston to make sure you are clearing the valves, if you go this way.
good luck!

[Tiit]

In case you didn’t know, intake manifold runner length has nothing to do with boost. Manifold behaves exactly the same way N/A and under boost. Long runners improve power low revs and shorter runners kill power down low.
Watch this excellent video about intake manifold runner length.
https://youtu.be/Eh4P8lvBuCU

[r.martin]

Thank you guys for the insight. I'll be sure to make the runners as long as the space constraints will permit. I am sorting out the steering knuckles while I am waiting on a part to be cut for the blower support.

[r.martin]

Question for anyone who has done a ground up build on one of these did you pull all of the wiring and rewire from scratch?