Has anyone compared dyno graphs of a typical stage II tune versus a average build turbo upgrade? Is the turbo upgrade mostly just top end HP? I don't race my car only spirited driving on street occasionally. Wondered if there would be much of a difference for me between the two for me as the stage II tunes produce a lot of bottom/mid range torque. If I have to wring the car out to 7500rpm to see the real difference of turbo upgrade not sure it's worth it for me.

 

You can't do a turbo upgrade without a tune.
Boils down to power goals you have. But I can tell you that upgraded turbos will show gains in mid and top end. Huge difference, and an average upgraded turbo build done right will demolish any stock turbo car in terms of power made.
But remember that upgrading turbos without supporting hardware mods (DPs, intake, fueling like ethanol/meth, etc) will neuter the power gains from them.

 

No - you missed the point. I'm asking what it feels like driving on the street with a stage II tune versus having a full blown turbo upgrade done. I don't race the car. Not sure if the real HP gain in the turbo setup is high in the RPM band where I typically don't drive. Trying to figure out if I'd be just as happy street driving with a stage II tune.

 

An off the shelf tune on stock turbos will be just fine for what you need. A bigger turbo with supporting mods and custom tune would be the next step if you want to start reaching specific drag numbers.

 

I've done a bunch of research on this for this platform. From what i gathered, the stage 2 with downpipes is a good setup if you're not planning on going the track and just daily drive with the occasional spirited, much louder run. A stage 3 setup with a turbo upgrade will really wake-up the top end past 5000 RPM. There are claims that just swapping out the turbos to say a Pure 800 or similar, with get you 60+ hp on the top end with no additional tune changes. Take that with a grain of salt, but there are dyno charts out there if you look hard enough. The pickle is the cost of a proper DP installation. The cost of DPs + install seems to run between $2800-$4000 depending on your labor options; DIY, reputable shop, cutting the stock DPs, dropping the tranny, etc. Installing turbos seems the easiest process most decent DIYers could tackle on their own.

I have a stage 1 Renntech GLC63 and love the low to mid range power, but the top end really dies out past 5500 rpm. I am definitely upgrading turbos eventually and keeping stock cats. I may not get the full potential, but really don't want to spend a couple grand for DP install and eventually spend the same couple grand to remove when i decide to sell the car.

To simplify, $3500 ish or more for more low-end daily drive ability or, $4500-ish for more top end power, but easily reversible if you want to sell you car alter or need to get a smog check.

Keep in mind i fully intend on taking my car to the track once they're opened up again, hence the bias towards the turbos. I also know i'm eventually moving on to a new car in about 3 years. I also don't care to make the car any louder than it already is so another reason for me to not got he DP stage 2 route.

All my opinion and personal reference of course. Cheers

 

Excellent response. This is the information I was looking for.

 

Seriously? No I didnt, read my post again:

Didnt realize you had done no research of your own and wanted someone to walkxyou through this. I was assuming some knowledge of modding this platform. Apologies.

 

Too funny. I've done a ton of research and do my own builds. But thanks anyways.

 

Your first response was I couldn't do turbo upgrade without a tune. Where in the world did I say that was what I was doing? Maybe you should re-read.

 

​​ OK man, was trying to help you but whatever. I never implied that you said that, was simply addressing it in context of the conversation. I would have thought someone who had done a ton of research would have seen that there is a big difference in dyno graphs and power made between Turbo upgrades and not. You seem like you're getting defensive, so good luck.

 

Certainly I understand there is a big power difference between a stage II tune and a complete turbo upgrade. I was simply trying to get real world feedback on street driving. I've compared graphs of stage II tunes and turbo upgrade packages. But was hoping someone had real world experience to share. If I'm not going full throttle all the time on the street, maybe the excellent torque characteristics of a tune only would be best for the street. But my fault for asking for feedback - apologies. Next time I"ll just look at dyno graphs and "do my research."

 

My old 63 made 564whp/590tq with stage II and mail order tune....add pure stg-2 with custom dyno tune 688whp/707tq.

 

Not true

We have a customer on pure stage 1 turbos with no downpipes just BMC filters and tune and makes 430 rwkw 100rwkw gain just bolt on turbos and his car has been doing that for 3 years

 

Honestly, unless you're putting fat drag radials on the car, tune only is already too much for the grip this chassis offers at anything below highway speeds. If I turn off my traction control, there will be two big strips of rubber behind me at 40mph before I hook, even on 305 PS4S which offer a lot more grip than the stock setup.

 

For those that already went upgraded turbos, what are some companies you considered/used?

I'm already stage 2 w/DPs but need serious power gains past the 5k rpm range, car seems to run out of steam top end.

 

None of what i said should be contentious.
In fact, everything you said is consistent with my statement. In your example, the car has a tune, and is making less power than it would if it had more supporting mods. True?
430kw equates to 577 hp, which for a turbo upgrade M177 w205 build is low. Great improvement over stock, sure - but still low compared to most w205 turbo upgrade build #s in the 6-800 whp range. In fact, one could get close to 430 kw/577 whp on stock turbos with just a tune and intake, no DPs.
Be clear: Im not bagging on Pure or anyone, just stating facts about realistic power expectations from mods.

 

^^Actually pretty good #'s MR747 posted for filters, stage-1 turbos, and tune only. still on stock DP's

 

Pure 900 and YP4 are your best options , Depends on your power goals are really ?
The pure range is 100% plug and play and has almost stock drivability , I ran 5.38 100-200kmh running the pure 900”s before switching over to the YP4 , the install was a bit more involved (had to mess around a bit clocking the turbos and getting the waste gate actuators setup)

 

This is stock dotted line vs Renntech stage 2 with downpipes. making a new thread to discuss these results...

 

Its actually a really good number we done a touch up tune a few months after this and made 450rwkw but i cant find that graph

Our aussie dynos read alot lower compared to US dynos for instance a stock car makes 310rwkw to 320rwkw with tune and downpipes they down 380-390rwkw so given that fact this car is making big power with bolt on turbos

 

Aside from the installation of the YP4 turbos being a bit more involved, can you comment on the performance difference and how the car differed driving around on the street? Were the performance differences (if any) worth the extra hassle of the installation?

 

I only did the install on the YP4”s last week and Yabeela left out two fittings , with it been lock down now I’m stuck until after the 16th to get replacements and get everything running. I had pure 800”s and Pure 900”s before the YP4”s , I’m going for power which is why I switched to the YP4”s

 

We're the pure 900 worthit over the 800s?

 

from pures website...I would guess the answer is "yes" ;-)

 

Marketing material doesn't mean much to me. I was asking him as he's got actual experience.

I wouldn't like to lose anything low down for Street driving. I'll take area under the curve over a headline figure on the street.