dyno numbers m60b30 to b40 intake manifold?

[94530inh]

Wondering if anyone has an idea of the hp increase when going from a b30 intake manifold to a b40 intake manifold. I did this mod and my car seems a lot faster, but no idea on the hp increases. I thought Dinan sold this as a mod, so I figured their website has some numbers, but they do not offer the part.

Who's got info on this awesome mod?

[Isaacus]

Don't think I'd ever heard of that one before. Good job going for the swap.

[T444E]

Dinan sold it as a mod to Vanos E39 540i as far as I know.

[Steve547i]

garrett! sell yer e32's intake manifold

[T444E]

It's probably junk.

[me78569]

I did the mod also. I am pretty sure that it made the torque band bigger. I am not sure that it increased and big HP numbers

[xatlas0]

Increasing the plenum volume and runner length typically increases low-end torque, while inhibiting high-end.

[skylinergtr]

with my mod's listed in my signature (includes B40 intake manifold) i was able to make 190rwhp on the dyno at Miller Performance. 530i automatic. If your gonna swap it make sure you have the 540i throttle body.

[Funk49]

If your gonna swap it make sure you have the 540i throttle body.What' is the difference in the throttle bodies ?

Are they different sizes ?

[NikosX]

Yes they are.

[skylinergtr]

yes the throttle body is larger. i think that is where most of your gains are going to come from because i never thought the intake manifold was any different really.

b30 vs b40 throttle bodies

http://i19.photobucket.com/albums/b173/skylinergtr/intake/IMG_0069.jpg

[Busted Knuckles]

Will the B40 throttle body fit the B30 intake?

I am contemplating this swap as well and if the manifold really isn't any different, I don't want to waste the money or time on changing it for nothing.

[gricey]

Really you should just swap in a b40. That would have the most benefit!

[Sir Montalbon]

...if the manifold really isn't any different, I don't want to waste the money or time on changing it for nothing.

Not so fast my friend...

I seem to remember a thread not too long ago where someone posted side by side pictures of the b30 and b40 manifolds, and the b40 manifold had bigger runners. I also seem to remember some kind of obstruction molded into the top rear section of the b30 manifold.

I'd do a little more digging before making a final decision.

[jfj707]

The manifolds are definitely different, as are the TB's.

Who wants my M60B40 throttle body? =)

[quick93]

I have a complete 540 intake, throttle body and injectors that came off my parts car if anyone is interested.

[DUDMD]

The b30 has some sort of a plate inside of it also. Throttle bodies are 3" compared to a b40 3.5" one.
difference viewed from top.

[Busted Knuckles]

Noticeably larger runners. Thanks for those pics.

Why does everyone come in and say "just swap in a B40"? That's a hell of a lot more money and work.

If I wanted to swap motors I would, but for less than a hundred bucks for the parts and a couple hours of my labor I thought I'd give it a shot considering I have to take my intake off anyway to replace the gaskets (suspect vacuum leakage).

[DUDMD]

Swapping in a b40 is a much better option if you're after the performance factor. The pics are from my swap progress and it's worth every penny. (Free for me cause I bought a parts car and got all of my money back already, resulting in a free swap.) You can the whole entire swap for less than $750, depending on how much you pay for the motor.

[gricey]

Noticeably larger runners. Thanks for those pics.

Why does everyone come in and say "just swap in a B40"? That's a hell of a lot more money and work.

If I wanted to swap motors I would, but for less than a hundred bucks for the parts and a couple hours of my labor I thought I'd give it a shot considering I have to take my intake off anyway to replace the gaskets (suspect vacuum leakage).

ha I was trying to be funny:) probably not very well

My b40 cost $360 increased the performance of the car a great deal.

[Busted Knuckles]

ha I was trying to be funny:) probably not very well

My b40 cost $360 increased the performance of the car a great deal.

Not to worry.

I just don't have it in my budget right now to stuff any more motor in my car. I know of a complete M62B44 for $500 and it's killing me NOT to buy it.

I've got too many other projects that I'm trying to work on at that same time and my B30 runs too good (most of the time) to think about ripping it out in exchange for another "unknown".

[Funk49]

Just remember, if you increase the AIR intake volume you also MUST increase the FUEL volume as well.

[me78569]

I pretty much took the entire intake, throttle body, airbox, and injectors from the b40 in my parts car and put it on the b30. I would love to swap in the b40, but I know my tired 260k auto tranny wouldn't handle it and I don't have time to do a 5 speed swap now.

[T444E]

Noticeably larger runners. Thanks for those pics.

Why does everyone come in and say "just swap in a B40"? That's a hell of a lot more money and work.

If I wanted to swap motors I would, but for less than a hundred bucks for the parts and a couple hours of my labor I thought I'd give it a shot considering I have to take my intake off anyway to replace the gaskets (suspect vacuum leakage).

Not really. Find a 540 parts car for 500. Me and two friend has my B30 out in 2 hours.

[skylinergtr]

currently im using a b30 intake (i swapped it back because i thought my b40 has a leak or crack somewhere). Its doing okay, although i think there was more low end power/torque with the b40 intake. I am also using the b40 intake with the b30 manifold. It still works no problem. I havent changed a TB itself without taking the intake, but it makes it a hell of a lot easier to take out the intake manifold to do the TB swap and gasket. Once you take the intake manfold a few times, its actually quite an easy job. I can do it in half in hour now probably.


Really you should just swap in a b40. That would have the most benefit!

do you still have the 530 trans (5h-18) in there? if so, hows it holding up?

[m60b30530i]

I had the b40 intake and tb swap with a tune you would probably see 15 to 20hp gain.

The guy i sold it to said he dynoed it and it made 220rwhp

[skylinergtr]

I had the b40 intake and tb swap with a tune you would probably see 15 to 20hp gain.

The guy i sold it to said he dynoed it and it made 220rwhp

wow. no offense, but i dont really believe that. Thats hard to achive. When i dyno'd my 530i at miller, Auto 540's were making 222rwhp.

[gricey]

wow. no offense, but i dont really believe that. Thats hard to achive. When i dyno'd my 530i at miller, Auto 540's were making 222rwhp.

Yeah I dont believe that either!

the 5hp 18 is still in there and seems to be fine.

I have done about 300 miles so far and it is not slipping or hesitating or anything. I did change the filter and put new fluid into it.

This tranny was in the M3, I think it will be ok for a while

[Funk49]

Why does everyone come in and say "just swap in a B40"? That's a hell of a lot more money and work.
Cause they have $$ to blow. :confused

[Yahweh]

Dont all m60's / m62's have 19lb injectors?

[loxxrider]

Considering it is a MAF car, more fuel shouldn't be an issue unless the car is running out of fuel on the stock setup. I seriously doubt that a 10 hp increase or so would not be able to be compensated for easily by the ECU.

I might consider getting a b40 intake manifold and tb from the junk yard for like $60 total, but that could be $60 better spent towards a b40 swap lol

[moroza]

Increasing the plenum volume and runner length typically increases low-end torque, while inhibiting high-end.

The B40's runners aren't any longer than the B30's, but they are significantly wider, and the plenum is larger.

[93FIM5]

The B30's runners aren't any longer, but they are significantly wider, and the plenum is larger.

No the B30s runners are narrow compared to the B40, look at the earlier pic. Are you back in SF?

[ross1]

Increasing the plenum volume and runner length typically increases low-end torque, while inhibiting high-end.
I thought long runners were conducive to top end and large plenum to low..?

[DUDMD]

The manifolds are same physical size, only difference is the the volume for the runners. Look at my previous pics people, I have had the 2 engine side by side and that answer many of your questions.

[K Fox]

I thought long runners were conducive to top end and large plenum to low..?

No no - more length in the runners helps low end power. Air has mass, and making it flow through a long tube gets a bit of 'ram air' effect going at the intake valve(s). Having shorter runners reduces the mass of air in the runner, allowing it to accelerate faster, which is great for throttle response and high end power. Larger diameter runners is also good for high end power, allowing more air to flow, whereas smaller diameter runners will boost low end torque due again to that 'ram air' effect. But smaller diameter runners (ie B30) has a detrimental effect on high end power because it's tough to get all of that air to fit inside the small runner. Breathing through a coffee straw, as it is.

Fox

[moroza]

No the B30s runners are narrow compared to the B40, look at the earlier pic. Are you back in SF?

Durr, I meant the B40. Edited accordingly. I'm kinda back in CA, kinda not.


The manifolds are same physical size, only difference is the the volume for the runners. Look at my previous pics people, I have had the 2 engine side by side and that answer many of your questions.

Have you looked inside a B30 plenum? There's a plastic piece that's essentially a filler, making the plenum volume much smaller than a B40's. Externally, yes, they're the same size.

[me78569]

Can we just agree that if someone doesn't want to swap an engine because insert reason here that it is a worth while upgrade provided you don't spend more than say $200?

With the b40 manifold, TB, MAF on my b30 it seems like the engine builds power significantly around 4k to redline Compared to before the power band is way different.

[Yahweh]

Nobody though yet with dyno numbers?

[DUDMD]

Durr, I meant the B40. Edited accordingly. I'm kinda back in CA, kinda not.



Have you looked inside a B30 plenum? There's a plastic piece that's essentially a filler, making the plenum volume much smaller than a B40's. Externally, yes, they're the same size.
Yeah, I looked inside of one before. I still have the engine from my old 530i/5 in my garage.