Brera 2.2 petrol engine going over bumps problem - Page 2 - Alfa Romeo Forum
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(Post Link) post #26 of 71 Old 28-08-16 Thread Starter
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Thanks guys,
1. Thanks Angoose, I just used the online calculator and 2.3 bar = 33.3587 psi
2. Buon I am not sure what you mean by suspension peck. It scrapes the undertray as shown in the pic but never scraps when I go slow over dead policeman hump . It only scraps if I go over the centre humps right in the middle of the lane

Question is to remove the undertray or not? May I have a vote please?

Many thanks guys
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No, keep undertray until you get an exact reason for scraping.
45k miles is virgin car in fact to suspect suspension, but there are no miracles in real life...
I have non-TI 159-er lowered with H&R 30, mm and 225/45/18 tire ( iso 235 ).
I have in fact 7-8, cms clearance at lowest point. Nothing wrong.
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Had the same issue ! Got a tbi brera, used to scrape horribly going the speed limit over any bump or change of incline/decline. Took it to Power Italia recently who found that it was sagging in the middle and had no bolts holding it up, could've fallen off at anytime . They fitted some new bolts and can now go over bumps at 20mph without scraping.

Might as well keep the tray or see if you can get one made at a local independent , it's there for a reason
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Originally Posted by fong21051 View Post
Thanks guys,
1. Thanks Angoose, I just used the online calculator and 2.3 bar = 33.3587 psi
2. Buon I am not sure what you mean by suspension peck. It scrapes the undertray as shown in the pic but never scraps when I go slow over dead policeman hump . It only scraps if I go over the centre humps right in the middle of the lane

Question is to remove the undertray or not? May I have a vote please?

Many thanks guys

Sent from my SM-N9005 using Tapatalk
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Quote:
Originally Posted by fong21051 View Post
1. Thanks Angoose, I just used the online calculator and 2.3 bar = 33.3587 psi
Live and learn - I've always used a factor of 15 for conversion - yours is correct (tho' I'm sure a pound either way won't hurt and probably doesn't make any difference to ride height)
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There seems to be around 5 or 6 inches between the undertray and the engine. You don't really need the undertray...
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(Post Link) post #31 of 71 Old 28-08-16 Thread Starter
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Thanks thehappybear. But from the pic, it is an undertray problem them? Does mine seem to be falling and requires new bolts? Thanks
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Difficult to tell from your image but it does not appear to be obviously hanging down to me. Best thing to do is to get the front in the air, slide under and check. If it is secured properly removing it won't help you much as 5mm above the undertray is the subframe it attaches to!

I've only left mine off because it traps water against the subframe and makes it rusty. I'll probably put it back when I can find a way for it to sit slightly away. I'm currently thinking some thick cable ties around the subframe but hoping for a more elegant solution!
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Quote:
Originally Posted by Rewe View Post

I've only left mine off because it traps water against the subframe and makes it rusty.
It's drilling time !!!!


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(Post Link) post #34 of 71 Old 29-08-16 Thread Starter
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Thanks Rewe for your response.
1. As mentioned earlier, I am content with the looks so I would rather not change my 16" tyres to 18" considering it will only raise the car by 10mm anyway (comparision pic attached), so wouldn't make much difference.
2. I have attached a couple more pics of the front of the car showing the undertray. Is it worth the money taking it to an Alfa garage to see if anything they can do or not?
Thank you guys
Attached Images
File Type: jpg 2016-08-29 10.14.08.jpg (193.1 KB, 15 views)
File Type: jpg 2016-08-29 10.14.21.jpg (156.1 KB, 15 views)
File Type: png tyres.PNG (164.6 KB, 17 views)
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Quote:
Originally Posted by fong21051 View Post
Hi Guys,

I own a Alfa Romeo Brera 2.2 petrol engine, but everytime I over the bumps (especially the ones right in the middle of the road), it will scrap the bottom of the car. I notice that this is much more severe with passengers!
(my Brera currently has the standard 16").
I am sure I am not the only one with this problem, and any help is greatly appreciated!

Many thanks in advance
Where did you get the idea that 16" rims are standard for a UK Brera, because they are not, and never have been,
The standard rim size is 17" as can be seen below,
that is from the Brera user's manual which can be downloaded from here.

Saying that the ground clearance is the same for all versions, except the Prodrive versions.
which is 5.9"- 150mm

https://www.fiat-lancia.org.rs/Manua...39;sManual.pdf
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File Type: jpg Brera std tyres.jpg (110.9 KB, 19 views)

Last edited by John C.; 29-08-16 at 11:08.
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16s were available on the Brera outside of the UK.

As were cloth seats.
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(Post Link) post #37 of 71 Old 29-08-16 Thread Starter
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So from my pics above of the undertray, is it worth the money taking my Brera to the Alfa garage to see if they can do anything?
My only other alternative is to upgrade the wheels to 18" but this will only raise the car by 10mm..
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I have looked at white scratches at undertray from your pictures.
It looks for me that this scratches are located in front of the undertray and you get them before front wheels have ever reached any bumps. This means undertray is really too low. Or alternatively than you approach bump you put the brake which creates this suspension down peck I mean before. Sorry I do not know how to explain it correct. This would mean that suspension is not tough enough.
Anyway I would check undertray position first this case.
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Quote:
Originally Posted by BuonGiorno View Post
No, keep undertray until you get an exact reason for scraping.
This. It'll afford some protection, I don't think Alfa put them on just for the hell of it.

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Originally Posted by John C. View Post
Where did you get the idea that 16" rims are standard for a UK Brera, because they are not, and never have been,
The standard rim size is 17" as can be seen below,
that is from the Brera user's manual which can be downloaded from here.
Thought so.
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The only reason I have scraped my undertray is because the stupid speed bumps on one road here are all sizes, some are no problem and others are scraped to buggery where everything bar buses and Chelsea tractors hits them, I just avoid this road now.

I dont understand how changing wheel size can raise the car though, surely the overall wheel/tyre combo has to be the same size or the speedo would be affected, or am I wrong?

Last edited by SpiderSaint; 30-08-16 at 12:05.
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I don't understand how changing wheel size can raise the car though, surely the overall wheel/tyre combo has to be the same size or the speedo would be affected, or am I wrong?
In the example on this thread (16" to 18"), the difference in tyre height is 1", or 12mm higher to the hub, thus raising the car.

And the speedometer is affected. In my Brera, with 17" wheels the speedo reads 70 mph, but when the speedo reads 70 mph with 18" wheels, the car is travelling 71.1 mph.
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Those 16'' wheels the OP has are fitted with the wrong size tyres.
They should be 215 x 60 x 16, not 215 x 55 x 16.
This will give a near-identical rolling radius to using the wheel/tyre combinations given in the owner's manual.
There shouldn't be a 1'' height differential as is currently the case against 235 x 45 x 18.
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Do stop talk about tire change mms.
Undertray scraping is definite attribute of nice lowered, sporty and aggressive car to be proud off.
More scraping.
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Quote:
Originally Posted by BuonGiorno View Post
Do stop talk about tire change mms.
Undertray scraping is definite attribute of nice lowered, sporty and aggressive car to be proud off.
More scraping.
Haha, with 16'' rims - who are you trying to kid?
With correct tyres the OP wouldn't have much of an issue.
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Standard R16 for 159 ( I have never seen Brera manual ) is 215/55/16 ( not 60 profile ).
I do not already remember 60 profile with Alfa as from 156ers with 205/60/15.
I have used winter ones 205/55/16. It is wrong size but I have been left with new set of spiked Pi Carving which is perfect for my climate.
My view it is not a wheel size problem here or problem is just accompanied with smaller wheels.
Just look seriously at the way of scrapes on photo. 12, mm raise would not be enough to solve it.
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I use 215-60-16 on my 159 sw.
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I use 215-60-16 on my 159 sw.
Oh dear... You are here...
I would even stay with 65 profile depressed with your roads.
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Oh dear... You are here...
I would even stay with 65 profile depressed with your roads.
Yes, my Dear!
Roads in Kyiv is near perfect, but if you are travel to the East side of Ukraine you better be on 70, 80.. 90!
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Quote:
Originally Posted by BuonGiorno View Post
Standard R16 for 159 ( I have never seen Brera manual ) is 215/55/16 ( not 60 profile ).
I do not already remember 60 profile with Alfa as from 156ers with 205/60/15.
I have used winter ones 205/55/16. It is wrong size but I have been left with new set of spiked Pi Carving which is perfect for my climate.
My view it is not a wheel size problem here or problem is just accompanied with smaller wheels.
Just look seriously at the way of scrapes on photo. 12, mm raise would not be enough to solve it.
Do the math
And it's not 12mm, it's 25mm or an inch.

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I use 215-60-16 on my 159 sw.
Correct size
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Yes, my Dear!
Roads in Kyiv is near perfect, but if you are travel to the East side of Ukraine you better be on 70, 80.. 90!
Agree... Only one remark... It is does not matter East Ukraine or West Ukraine in all. Ukrainian roads are rubbish everywhere but Kiev. Last one I have used is Odessa-Chichinaw*Moldova. I do not recommend you to continue here this nice way. You can easily create a new thread you like or post any others have been created before. Not by me likely.
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