We'll do just that. In fact, we have a 2002 A4/3.73 C5 Corvette Vert here with one of our 427 engine performance packages that is getting one of these systems installed now. We chose the C5 TT system for this car mainly due to the huge airflow potential of an engine of this size- however, we did include catalysts, A.I.R. injection, etc. etc. etc. as we would with our standard C6-to-C5 TT system retrofit packages we normally build here.

 

Just from looking at the pics on their site, it appeared the cats on the system would end up right after the wastegates, close to where LG has customers install them on his Pro Long tubes. Is it that much farther back?

 

Well first off that sounds great!! but a better example would be a 346 vs 346 both with the same combo that way we could see the 1000 rpm difference in spool. The 427 is not going to have a problem spinning either of these units. The larger C5 units will most certainly be a better choice with the 427. Remember APS did say they sized the C5 kit turbos on the fact the a lot of guys want more cubes so they gave them growing room. I still would like to see proof of your 1000rpm difference claim.

Les

 

That would be an awesome comparison.

On a side note, APS has dyno charts of their ZO6 test mule, and the one that comes right to mind is the run that makes just over 600 RWHP........IIRC the power/boost chart showed boost coming up and peaking at about 3100-3200 RPM........

GOt it:


Looks like about 3800 RPM for full boost.

 

We're sure you'll see it soon enough and we have no desire or need to "prove" ourselves to anyone. That just doesn't matter to us... We'll just continue to do what has made us successful business to date and let the internet debates carry-on however they wish- as they usually do....

Have a nice night...


DTE

 

Correct and as we stated- spool begins at approx. 3200.....

DTE

 

Again, this is a question....Would this matter in a standard trans app? Or how about an auto app with a 3800 stall? My kit is going on a M6 so I'm not worried about the rpm difference between the bb turbo and journal turbo's, it just takes a little more rpm dropping the clutch. I would think it will be a little more streetable too with the journal turbo's, but I don't do this for a living, so I wouldn't know.

 

What are you doing to retain the A.I.R. system with the C5 kit? I want to retain mine.

 

I believe they are just using the C6 kits on the C5's.

 

From the pictures that I have seen there are no A.I.R. fittings on the C6 manifolds (unless they are in a different location than the C5).

 

Not trying to start a debate but spool begins at 2400rpm as can clearly be seen 2psi at 2400rpm. Phil I and a lot of others have respect for you but you are the one claimed the 1000rpm difference I just think proof would be nice! Again I am not trying to start a debate nor do you need to prove anything but I believe you are wrong on the difference.

Les

 

You're not looking at the entire picture here...

The engine does not effectively respond to the intake pressure charge to where it actually makes any significant power until approx. 3200 RPM. That is what we are interested in when we evaluate effective turbine shaft RPM that translates into effective boost pressure where the engine produces any sort of real power. The C6 system does this very thing you see in the graphs posted here, only quicker as stated before. You'll see what we're talking about at some point when someone posts a similar dyno graph of the C6, if not us.

 

Phil again I am not trying to argue but a C6 is a LS2 based engine and a C5 is a LS6 or LS1 and we all know the LS2 responds very favorably to boost even with its high compression. But I do agree once some cars are running around and dynos are posted then we will get a clearer picture. Oh I do have a APS kit on my LS2 GTO with the GT28s so I do know how responsive these turbos are. But until I see same engine combo with both kits I will continue to have doubt until the dyno #s are posted.

Les

 

That's fine.

 

Phil, as do I have respect for you, but can someone answer my damn question I've asked for two or three posts now, please.

 

I have a question. If spool response is that important, couldn't an anti-lag system (like on the celica GT4 WRC of the late 90's) be incorporated, essentially being tuned to when you put the car into PE mode at low RPM's the tune intentionally runs it on the lean side to heat the EGT up more, thus moving more air through the impellers spooling them up faster??? It would have to be spot on or risk being a dangerous move, but it's doable, as proven by toyota.

 

I can sort of answer this for you, the six speed will boost differently depending on gear and load on car. As a example my GTO in 1st and second will not hit full boost since there is not enough load because the tires are spinning. If I roll into in 3rd it will start to build boost around 2100rpm and be at full boost buy 3000rpm . In fourth it will start to build boost at around 1900rpm and be at full boost around 2700rpm.

An auto car with a loose convertor will build boost at a faster rate but at a higher rpm since the convertor will not load the engine until it hits its stall speed. A auto with a stock convertor will be on boost almost imediately since the convertor will load the engine almost immediately.

Remember turbos and autos are like peanut butter and jelly they do compliment each other very well. And you can taylor your power delivery with the correct convertor to suite your needs.

I will say this as nice as it is to have fast spooling turbo I would welcome a little slower delivery since even my 3800lb GTO with sticky tires will spin the tires at will. Imagine trying to do the same on a vette that is lighter and will already spin the tires easily without a turbo kit.

Les

 

100% Correct..........the C5 twin turbo system has larger turbine wheels and turbo housings than the C6 system to cope with larger cube engines that C5 owners are now frequently building..........the C5 twin turbo system has loads of in built flexibility to cope with 346 - 427 cube engines, all good.

Peter

 

Damn .... the rearmount STS can build decent boost by 3200. I was expecting a quicker hit from these frontmounts.

 

I believe you will be pleasantly surprised with the spool up of this kit.

Les