MyE28.com

RonP wrote:It has raw, crisp power off the line largely due to the 2.5/2.8 intake

I've heard this before but I don't get it. Can someone please explain this to me? I don't understand how a smaller bore TB increases performance. I'm not trying to be facetious or sarcastic in any way I assure you. I'm guess I'm missing part of the story or something.

Ta

Smaller diameter runners increase flow velocity at low RPM, which tends to shift the torque curve lower. Short runners of large diameter (think S38) have low velocity flow at low RPM, which tends to cause poor charge mixing and cylinder filling, which shifts the torque curve higher. Cam profile and timing affects this as well.

mooseheadm5 wrote:Smaller diameter runners increase flow velocity at low RPM, which tends to shift the torque curve lower. Short runners of large diameter (think S38) have low velocity flow at low RPM, which tends to cause poor charge mixing and cylinder filling, which shifts the torque curve higher. Cam profile and timing affects this as well.

Nice explanation. Also worth mentioning are some of the other Hartge factory H5S package goodies that make it so quick: the ported & polished intake manifold matched to the head, the oversized valves, the 282 cam, the 10:1 compression, the CR box... it all adds up to one fun car to drive. I swear it's quicker than my M5. Hell, I could peel out in my '83 H5S even with it's 3.07 diff. Also, an interesting thing happens around 90 mph in these cars, you kind of feel a noticeable "click", kinda like a turbo has just kicked in - you're at 110 in a blink of the eye. And they're stripped-down light! These cars are ticket machines. Good luck keeping it under the speed limit!

Minotaur wrote:

mooseheadm5 wrote:Smaller diameter runners increase flow velocity at low RPM, which tends to shift the torque curve lower. Short runners of large diameter (think S38) have low velocity flow at low RPM, which tends to cause poor charge mixing and cylinder filling, which shifts the torque curve higher. Cam profile and timing affects this as well.

Nice explanation. Also worth mentioning are some of the other Hartge factory H5S package goodies that make it so quick: the ported & polished intake manifold matched to the head, the oversized valves, the 282 cam, the 10:1 compression, the CR box... it all adds up to one fun car to drive. I swear it's quicker than my M5. Hell, I could peel out in my '83 H5S even with it's 3.07 diff. Also, an interesting thing happens around 90 mph in these cars, you kind of feel a noticeable "click", kinda like a turbo has just kicked in - you're at 110 in a blink of the eye. And they're stripped-down light! These cars are ticket machines. Good luck keeping it under the speed limit!

Wow, all this with a smaller bore piston huh?

I believe Hartge used the L-block M30s, which have a more-square bore/stroke than the later M30s, and shared with the S38 & M88 engines. I have driven Adrian's H5S and it is sweet, with an obviously stronger but more linear power delivery throughout the RPM range than any other M30-powered BMW I have sampled.

After hearing Tim's story, that would make two M-cars that couldn't shake the H5S. Glad Adrian's oil pump survived this time around

RonP wrote:

Ron,

Did you recently order these fender liners? To the best of my knowledge, the replacement parts are still black. The grey liners are period correct and NLA--great attention to detail here. If you ordered a set recently let me know as I want them!

Best,
RCBMW

Did you recently order these fender liners? To the best of my knowledge, the replacement parts are still black. The grey liners are period correct and NLA--great attention to detail here. If you ordered a set recently let me know as I want them!

Regan,

I scavenged some from a parts car that were in good shape, sanded them down, primered them, painted, and clear coated them. Cleaned the rubber and put new cad plated screws in.

RonP wrote:
Regan,

I scavenged some from a parts car that were in good shape, sanded them down, primered them, painted, and clear coated them. Cleaned the rubber and put new cad plated screws in.

And that is why it is a "RonP" car and not just some scavenger flipping a rare car for a quick profit.

rcbmw wrote:Did you recently order these fender liners? To the best of my knowledge, the replacement parts are still black. The grey liners are period correct and NLA

I noticed this too. I replaced mine relatively recently as the grey ones were all broken and cracked/split. I was stoked to find the replacements being black instead of light grey.

I for one don't believe the colour was ever chosen to be grey. They just turned out that way from the plastic chosen to form them. I think if black had been a no-cost option at the time, then black they would have been. Obviously, now, later on, black has become an option and that's what the replacements are.

I for one, would not regard black liners as any valid reason for marking down any E28 on basis of originality. There are changes that make sense and others that do not. This is one of the changes that makes a whole lotta sense to me.

My 533 has grey ones and my 535 has black. The ones on my 535 are in pretty poor shape, but I can't find a nice set of grey ones anywhere.

Pics of the front and rear end

japandrew73 wrote:Pics of the front and rear end

i'll try to sneak a few shots tomorrow when im up at ronp's shop

frink84 wrote:

japandrew73 wrote:Pics of the front and rear end

i'll try to sneak a few shots tomorrow when im up at ronp's shop

I know what it looks like I was up there today. Now that the headlights and badges are on, it looks AWESOME

japandrew73 wrote:

frink84 wrote:

japandrew73 wrote:Pics of the front and rear end

i'll try to sneak a few shots tomorrow when im up at ronp's shop

I know what it looks like I was up there today. Now that the headlights and badges are on, it looks AWESOME

Tease! Where are the pics?

Yes, please share some pics soon!

es, please share some pics soon!

I will post some more pics up this afternoon.

RonP wrote:

es, please share some pics soon!

I will post some more pics up this afternoon.

Thanks! I'm stuck at work on a 12hr shift & need some good entertainment.

Is this car for sale Ron?

Lately I only look at the eye candy section hoping for more pictures of this car.

EuroShark wrote:Lately I only look at the eye candy section hoping for more pictures of this car.

Every time I see a reply has been posted, I hope it's Ron with some photos of the car!

i got a shot off while ron wasnt looking 8)



its a hover-edition hartge!

frink84 wrote:i got a shot off while ron wasnt looking 8)



its a hover-edition hartge!

My shot would'nt have been from the camera

There's that look. Ron, did you get my email with instructions for running the washer tubing for the headlamp cleaning system? Just run the tubing, and the wiring loom, and them simply plug everything in. It should run correctly. Let me know how it works out

bkbimmer wrote:My shot would'nt have been from the camera

took care of that too

japandrew73 wrote:There's that look. Ron, did you get my email with instructions for running the washer tubing for the headlamp cleaning system? Just run the tubing, and the wiring loom, and them simply plug everything in. It should run correctly. Let me know how it works out

hooked it all up yesterday. as far as i know, it hasnt been tested yet

We were promised pictures!

You might have an angry e-mob on your hands soon...

I'd rather see Ron finish the car and do it right. We can see pictures after it gets a trophy...

Update:

Motor is in, but not running yet. Windows went in today and it looks like the tires we chose won't fit. Most of the car is buttoned up. We have been working day and night to get it finished in time, but I know you guys wanted some photos so here ya go!






Sorry there wasn't enough time to take even some good pics. Now, I gotta get back to work!

Looks phenomenal, Ron. Quite the transformation. Seeing the stripes in the sun really makes a difference!

Good lawd! Looks awesome Ron!

Incredible!