Nachtsturm

My daily is an SRT-4, and it runs 16-17lbs peak. (Stage 1 PCM) Now talks of potential 35psi on a stock turbo, insane.

I hope the aftermarket really takes off on this car. Does anyone know what size the turbo is, or make and model?

Can't seem to find it anywhere.

T.H.Carrera

its a borgwagner I believe.

ML63 AMG

It's a twin scroll (similar to twin turbo) so the lag will be greatly reduced versus a standard large single turbo.

C63newdude

Well into the mid 400whp on the Evo 8 and 9s. The STIs are under 400 on the stock turbo. Again, we are talking AWD to the wheels here.
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C63newdude

Two different concepts and far apart. The twin scroll is just the input shape or the turbo from the exhaust manifold, the twin scroll is a twin intake vs a a regular single intake.

The twin scroll suppose to give you the advantage of accepting the air from two cylinders at a different pulse thus enhancing spool characteristic. The single scroll is just all 4 cylinders putting air on the opening and interfering a little bit on the flow.

C63newdude

I concur with you. At 26PSI already from factory that is pushing it. It probably has the latest on turbo technology like twin scroll , ball bearing and hopefully a HTA compressor wheel and some high PSI waste gate actuator from Factory but I just see a power limit already. I think that they squeezed as much as they could keeping in mind the drivebility and reliability. Injectors would be super expensive for this set up specially because the engine has direct injections and the PSI is probably above 2200psi. Same goes for the fuel pump, VW fuel pumps are very pricey on the MKV GTI and MKVI GTIs. my ,2c

Hotsoss

Good points C63newdude.

Here is an interesting read I came accross this morning: http://***********.com/content.php?3...AMG-dyno-graph

C63newdude

^^^Thanks for the link, I saw this video about two weeks ago and I liked it. The couple of things that I don't like is the 100%FWD to 50-50% traction. In real hard driving situations accelerating from a dead stop you want more like 65% rear and 35% front or even 70% rear-30 front. I am saying this from owing 12 AWD cars (4 Evos, one STI, one WRX, 2 VR4s, one Carrera 4 and 4 DSMs).

Another thing that doesn't convince me is the watercooler intercooler. It seems like the water cooled intercooler"suppose" to offer better cooling than the air to air but a good FMIC with a decent size and shape does the job very well. Just thinking about having this hot water trying to cool a core doesn't make much sense to me, ironically I currently drive a car that comes from factory with a water cooled intercooler (or heat exchanger), this is a Passat TDI.

Hotsoss

Yeah, I was a little surprised that AMG would do that. I think this might be due to the fact that this is a front wheel biased vehicle. Could that be a factor? It'll be interesting to see if the CLA45 has the same distribution.

ghiaguy

That is exactly why. The CLA will be the same, I can't help but see this as a let down due to cost savings. Who can blame them though, they needed to work off the base CLA and not totally reinvent the wheel.

Hotsoss

I would still seriously consider the CLA along with the upcoming ATS-V, and maybe RS3 if I was in the market for a smaller more fuel efficient vehicle in future. I really like this car styling and it has real world performance. It'll run with just about anything you will encounter on the road from 0-80mph and with a few mods run neck and neck or faster than C63s

Bimbpy

Perfectly fitting, thanks for sharing!

Nachtsturm

Found the actual model turbo.

Twin-scroll BorgWarner B03 turbocharger

Rafiki

It's a 4 banger at the end of the day, unless major upgrades are being hanged I don't see more than 40~50 being squeezed out from it, the engine is already been pushed to its max by AMG

Hotsoss

In this month's Motortrend article for the CLA45 the reviewer is say that this is the best I-4 motor he's ever driven. He says the power is very linear like a N/A and the torque is immediate. Hey if the aftermarket can make this car accelerate faster than a M135i which is a beast when tuned then the CLA45 will be a force to be reckonned with once second hand buyers get there hands on one with no real concern about factory warranty.

Nachtsturm

LOL. Maybe on stock turbo this will be true. Depends if the aftermarket takes off. Direct bolt on turbo kits I do not consider major upgrades. The block is sandcasted w/ a closed deck, and the whole bottom end is forged.

Let's look at another FI 4 cylinder car with strong internals.

A stock srt-4 dyno's around 230whp, 300whp can be extracted with bolt ons and tune. Granted a stock srt-4 doesn't push 26.1psi stock, circa 14-15 peak.

Turbo swapped srt-4 50 trims make 400+whp, This can be done relatively cheap, even the 50trim can run on stock internals.

While GT35 turbo srt-4's have broken the 500+whp mark. Others are even higher. Red Sled comes to mind.

Do not discount a car just because it is a 4 cylinder. This isn't 1970. That turbo 4 stock is dynoing similar to what my modified M113 V8 can muster.

Rafiki

Not in anyway discounting the car because it's a 4, but how many of those SRT4s end up with blown engines at the end of the day, or rather can those with 500whp on their neons run that same setup for two years, if the money is there you can even get a smart fortwo to put down monster numbers, it's how long those set up can last for , now that's the trick

ML63 AMG

Interesting... The new BMW N55 turbo engine also uses the twin scroll Borg Warner B03 turbo (albeit with weaker internals).

I think 400whp for fully maxed out (including all possible bolt ons) is the absolute max you would push it. The real question is, how much can the DCT and PTU in the transmission handle. The PTU that sends power rearward is a very small unit, I would be shocked if it can handle more than 400whp with launch control.

Hotsoss

Good point.

Nachtsturm

I know over several stage 3(330-380whp) cars personally that are still doing fine today. 6-7 years maybe longer. Maybe not on the original clutch. But original engine for sure. Also know of a couple 50 trims that are still doing great as well. I personally don't know anyone with a 500whp SRT-4. I am sure you can still find them on the SRT-4 forum. Do some of them blow engines, sure. Bound to happen when pushing the envelope or trying to out smart the tuner. The CLA45 will be no different. The internals are there, now we just need the aftermarket.

I personally think a CLA45 with a hybrid turbo setup (similar to N54 setup) with supporting mods will have no problem engine wise. I am more curious to see how the transmission will hold as others have said. Then again Mercedes is not known for its strong aftermarket. So, only time will tell.

EVOII_Racer

The a45 is sick car really! I am rarely impressed but It's an insane machine amg and Mb managed to make! i drove one a go-kart typed racetrack and It's just perfect imo ! so precise, idiot proof, very quick and so so much fun to slide

Never experienced turbo lag unlike in the sl 500 i test drove before on the road... Imo the only issue with the a45 is that it sucks without the performance exhaust

MBfinatic

Thats amazing! Wonder how much power they could make using alcohol injection.

dav461

This is good point
No point to order it without this option..sound is completely different.

Exekious

It will all depend on how the engine is designed.

I think the aftermarket will really take to the CLA45. We are going to see lot's of high horsepower versions of this car. Tuners will figure out what the true limits of the car is. I would not make an assumption on the limits until it's been fully tested. I remember back in 2004 when I put HKS 272 cams in my Evo and had it tuned at 320whp that numerous people expected me to blow up my motor. Now most people know that Evos can take a lot more then that on the stock block.

Koru_Kinshi

So much for 400 whp max...

http://www.autoevolution.com/mercede...son-66810.html

That's a massive gain from just a tune. And to top that off, Carlsson is an authorized MB Tuner, so Mercedes will still honor the car's warranty with their parts on it.