We haven’t done a GB in a while

[cornercarver]

Larger throttle bodies do not always = more power. BMW engineers designed it that way for a reason. You can't change just one element in the intake tract without considering the larger picture; A smaller TB may provide better air velocity. I'm not an engineer, but it seems like velocity would be more important than volume on a naturally aspirated lower-displacement engine.

[ZHPizza]

I’d be interested to know how much performance increase that equates to. I remember Rob telling me he had the Dinan throttle body along with Dinan software installed and he was left underwhelmed...

Also, is the throttle a choke point on m54’s? I can’t remember how big or small the intake manifold opening downstream of the throttle is relative to the stock throttle body but if it’s smaller than 72mm then I can’t see the benefit of the bigger throttle body...


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He's working on getting me a dyno plot showing a 4-5hp bump on a bone stock engine. Add headers + intake and ??? 6-7hp???

I can't say that it's the final choke point as I also don't know what's going on in the manifold, but I can say for certain that moving the choke point helps quite a bit. I remember the whole intake on my 95 M3 was 3.0", but swapping the HFM and air filter to 3.5" made a massive difference, even though the rest of it still necked down to the 3.0" before the throttle body. Moving a larger column of air closer to the manifold is always helpful. BTW this one should be slightly larger than the Dinan (9% vs 12% increase in area).

I noticed no difference whatsoever. Same after I supercharged it. AJ at ESS Tuning said it would add maybe 5 HP with the supercharger...

There were some on e46f FI forum experimenting with throttle bodies from one of the V8s... I can’t remember whether they were successful.
Stewart is putting out well over 400hp in his wagon and I believe he is using the stock throttle body

If you want the car to breath better, I’d go for headers and cams before a throttle body

Absolutely. I'm already working on a header project and hoping that a bored throttle body will open things up just a bit more. I'm not expecting more than 5hp. I won't notice it anyway. I didn't notice the claimed 5-10hp difference with underdrive pulleys either, but I know that all of these little modifications to help the engine breathe better will build on eachother as I go. The manufacturer sent me a screenshot of a message from a guy that put one on his 330 and he said that the throttle response was greatly improved. That, I will definitely notice.

Larger throttle bodies do not always = more power. BMW engineers designed it that way for a reason. You can't change just one element in the intake tract without considering the larger picture; A smaller TB may provide better air velocity. I'm not an engineer, but it seems like velocity would be more important than volume on a naturally aspirated lower-displacement engine.

I am an engineer and brother, you're on the right track. High velocity going into the cylinders is crucial and that's the reason that you have the long runners on the intake manifold. The throttle body is upstream of those, so its job is to allow air into the main chamber of the intake manifold where it can be pulled down the runners and into the cylinders. Anything that you can do to reduce restrictions between the cylinder and the cold air source is going to be beneficial for both throttle response and peak power. It's the same logic of using a cone intake in place of the air box. It's not going to magically find 15 more hp in the engine, but 5 is perfectly reasonable.

[az3579]

The manufacturer sent me a screenshot of a message from a guy that put one on his 330 and he said that the throttle response was greatly improved. That, I will definitely notice.

I installed a Dinan throttle body on my ZHP back when it didn't have any power issues and while the difference didn't seem big, I did feel a very slight increase in mid-range "feel", if that makes any sense. Throttle response wasn't really any different; the lag from the drive-by-wire system was still present and didn't feel any difference in pedal inputs resulting in anything more than before.

[san]

He's working on getting me a dyno plot showing a 4-5hp bump on a bone stock engine. Add headers + intake and ??? 6-7hp???

I can't say that it's the final choke point as I also don't know what's going on in the manifold, but I can say for certain that moving the choke point helps quite a bit. I remember the whole intake on my 95 M3 was 3.0", but swapping the HFM and air filter to 3.5" made a massive difference, even though the rest of it still necked down to the 3.0" before the throttle body. Moving a larger column of air closer to the manifold is always helpful. BTW this one should be slightly larger than the Dinan (9% vs 12% increase in area).



Absolutely. I'm already working on a header project and hoping that a bored throttle body will open things up just a bit more. I'm not expecting more than 5hp. I won't notice it anyway. I didn't notice the claimed 5-10hp difference with underdrive pulleys either, but I know that all of these little modifications to help the engine breathe better will build on eachother as I go. The manufacturer sent me a screenshot of a message from a guy that put one on his 330 and he said that the throttle response was greatly improved. That, I will definitely notice

Ya I’m sure there will be better engine response but I hope there won’t be any loss especially at the top end due to possible reduced velocity. The dyno plots should be interesting...


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[Newjack]

I installed a Dinan throttle body on my ZHP back when it didn't have any power issues and while the difference didn't seem big, I did feel a very slight increase in mid-range "feel", if that makes any sense. Throttle response wasn't really any different; the lag from the drive-by-wire system was still present and didn't feel any difference in pedal inputs resulting in anything more than before.

I drove Rob's ZHP a few years back before it was supercharged with all the Dinan mods on it. For the amount he paid for the stuff I really couldn't notice any difference in power between my stock ZHP. I agree with Rob, even with a supercharger I don't think a throttle body is going to add much if anything noticeable. Headers are the real choke point.

I do vividly remember driving the car after using the power pulleys and remember a noticeable difference. The car felt way more ready and eager to rev and did feel a little bit quicker. I noticed more from the pulleys than I did from the shark injector tune.

[Sockethead]

The headers made the biggest, most noticeable difference when my car was NA. I'm talking like the difference you get by going to a 3.46 in the rear.
I think it let all the other mods finally breathe

[TLL0003]

I have all the Dinan mods including the throttle body, and honestly I don’t see a huge improvement except it sounds really good and slightly better throttle response

[Sockethead]

I have all the Dinan mods including the throttle body, and honestly I don’t see a huge improvement except it sounds really good and slightly better throttle response

Same here... until I put the headers on

[ZHPizza]

The headers made the biggest, most noticeable difference when my car was NA. I'm talking like the difference you get by going to a 3.46 in the rear.
I think it let all the other mods finally breathe

That's what I figured. I still want to do the big bore tb and play with some more intake configurations, but this has me thinking I'll wait until after headers are done since the effects will be more noticeable without the massive bottleneck on the exhaust side. The only thing I noticed after my DIY long tube intake was better sound and gas mileage.

[BADCLOWN]

I like the Garbino CF lip mentioned in another persons build thread. But apparently it was ordered from Japan