2000 c70 2.5t chiptuned with mbc

NineEleven · Post by **NineEleven** » 15 Oct 2015, 04:17

Hi guys I've got a question.

My car recently got a tune and it pulls good but I think i'm missing out on some horsies.
I also installed a boostgauge shortly after. The engine is a B5244T. 150k km. Do88 turbo intake and intercooler piping. IPD TCV. Custom catback.

Now I'm running around 0,7-0,8 bar of boost from second to fifth that drops to about 0,5 bar near redline. first is a mere 0,3.. This is manifold pressure.

so far so good? I would like to install an mbc to slightly increase the boost presuure to 1 bar. I wanna get the most out of my 13G turbo (should be around 250 hp/400 nm) I know people how run 240 hp on a bone stock remaped engine and I don't think got the same performance right now. Since my car is remaped I think it's safe to play with mbc. It shouldn't run lean or anything due to it being mapped. I can check that with my OBD Torque app

any thoughts? or a link to good mbc

sk55 · Post by **sk55** » 15 Oct 2015, 19:40

just make sure your running 91 octane or whatever octane your tune is for..

do you have 3 inch downpipe? that really helps get hot exhaust from the engine...

check youtube for a few MBC review, i think theyre all pretty similar.

just start slow... watch your boost gauge.... i use MBC on v70r... i got it set 15 psi...

you could run lean if boost is too high!.... thats why you need to check your AFR... i not that familiar tuning the volvo platform...

i'd prob keep it below 16 psi without a 3" downpipe...

if you want additional power you can add like 20% e85... just do 1 gallon first... then 2 gallon next fill up.. you DME will advance timing for you... its also safer for your engine e85 is 105 octane... prevents knock.

Post by **matthew1** » 17 Oct 2015, 13:17

I'm over 1 bar with just an MBC. Tunes and MBC don't mix, from my very limited experience (one tune, one MBC = misfire codes).

Where did you get your tune? Did you make it clear you're using an MBC concurrently?

NineEleven · Post by **NineEleven** » 20 Oct 2015, 03:35

It was tuned by a local company, no big name like rica. I don't have an mbc yet.

I don't plan to install a 3" downpipe nor run on E85

I'm using regular 98

Post by **matthew1** » 20 Oct 2015, 11:54

Oh, my mistake.

Did you speak to the tune shop?

Post by **RussB** » 20 Oct 2015, 13:56

Fancy intakes can't do their job without having anywhere for the extra air to go. Get a 3" (75mm) down pipe

NineEleven · Post by **NineEleven** » 21 Oct 2015, 15:31

maybe, still it's expensive and i've allready spend a lot on this car the past year.

So I've read about calculating the horsepower with the maximum value the MAF sensor generates. I did one run and got 180 g/s or slighty more. I still have to do some more tests to get accurate results. Devide this number by 0.8 and you should get an estimation of the max hp. 225 hp that is. That does mean it has won some horses over stock.

The guy I know had the same engine chiptuned to 248 hp on petrol and 258 on LPI

Should I reset the ecu and let the TCV calibrate again?

Post by **matthew1** » 22 Oct 2015, 12:39

Let's back up. What did the tuner claim the tune would produce, psi/bar?

If it's producing that, nothing is wrong, you're just looking for more performance.

If it's not producing that, there's a fault with the product you bought, and you should proceed down that road.

NineEleven · Post by **NineEleven** » 28 Oct 2015, 15:55

Claims 230 hp on the website. 360 nm torque.
I informed them and he said that the software is good and when he tested the car after tuning, it went to a solid 12 psi. Which it still does. He suggested to use a mbc and limit boost to 1 bar. the software is written so that 1 bar is no problem.

There isn't really a problem except for the fact that other tuners get more hp/nm out of this engine.

My mbc arrives tommorow. Let's play :p

NineEleven · Post by **NineEleven** » 02 Dec 2015, 02:08

So I've come to the following conclusion. WIth running only the MBC but keeping the tcv electrically connected:

At first I put the boost at 0,4 bar and it's a way better daily driver like that. I was so happy

Then I turned up the boost to 0,8 bar. The car pulls very good but on partial load it drives my crazy. It always try's to boost when I don't want it to. Give it a bit gas to accelerate around 2000 rpm and boom 0,7 bars of boost? I didn't want that! Also it emidiatly blows it off again. Not cool to drive like this allthough at full throttle it goes like hell.

So i'm running back on 0,4 bar. I lost power obviously but now I feel more connected to the engine and it does what I want it to do. In a way I haven't really lost a lot off top end power cause how it originaly was without the mbc the boost would drop to 0,5 bar on high rpm's like I said earlier. The low-end torque is a lot lower and doesn't come on to aggresive. I can almost call it lineair.

I'm planning to experiment with running the mbc in parallel to the tcv. See if I can get it to work on high boost without annoying me.