Hey guys, just wanted to update my latest (final) dyno #'s from my recent Edelbrock E-Force install on my 2010 Grand Sport A6.

Mods:
E-Force #1591 (599 kit)
ZR1 Cam
ARH 1 3/4" Catted Headers
160 t-stat
Corsa Sports
335/30/19 Nitto NT05's

*Tune temp was 68 degrees with basically no humidity...IAT's were relatively low due to outside temps --120-130 (lower than last weeks tune @100 degrees and no t-stat -- 150-160 IAT's)*

Results:
523rwhp/507rwtq

My thoughts:
Car feels unbelievable! The tuner said that the car was not responding to adding timing...I thought that my #'s would have been a little higher with more timing, but who cares...this thing moves just fine. I believe the timing is actually lower than Edelbrock's "tune", hmm (I guess that it is true, every car is different)...I can completely roast the 335 NT05's in the rear now in 1st gear...quite crazy...I haven't done but a few "quick" bursts on the way back to work from the tuner. I had a different cam before with no S/C that gave me 430rwhp but felt sloppy in the low end because of the lack of torque the cam created...well, now I am just over 400 rwtq at 2200 rpm's and it then peaks out at over 500 at about 5000 rpm...THAT IS THE REAL DIFFERENCE! Completely driveable with the ZR1 cam...sounds nasty and it will fly. Great kit, I love the low end this thing has.

Question...my tuner did say that the Z06 fuel pump that comes with the kit was @100% efficiency...so he had to lower the shift point down to 6200 rpms due to the fuel needed at rpms higher than that. Has anyone had this issue? I thought that the Z06 fuel pump had more juice than that!

I can't wait to drive home!

Scott

 

The rwhp sound about right to me.

I would not worry about how much advance you give it. More ignition advance does not automatically translate to more power. In my experience, each engine is different. I add/subtract advance until it makes the most power with no knock retard.

You have to love all that torque especially with the A6.

 

Nice result! Just add a BAP! The Kenne bell! They say they don't affect the life of the pump. You need more fuel if you want bigger numbers!

 

Nice #'s!

How much boost you running? what pulley?

 

The smaller pulley (3.5") I think...running 8psi. I can't wait to drive home!!!!!!!!!!!!!!

 

Scott,

It's more likely that your tuner either saw fuel injector duty cycle at more than 85%, he saw a loss of fuel pressure at the only point easily measured on the Edelbrock (at the rear of the passenger side rail) or he saw the car starting to lean out via the wideband 02 he was tuning with. I suspect it's the last because getting a fuel pressure sender on the rear of that rail is not easy and the injectors should be able to support a car at 85% duty cycle no problem. The Edelbrock ships with 52lb injectors which are fine for their ?stock? setup. You've added headers and a cam which probably pushes you up near the limits of the 52lb injectors. I have roughly the same setup as you with a slightly larger cam and and I've never seen more than 83% duty cycle on the injectors. I tune for a 11.5 wide open AFR which is fine. I'd ask your tuner to give you a little more intel on why he thinks it's the fuel pump and not the 52lb injectors. Ask him what data he was looking at to tell him the pump was the issue.

I suspect it's that the Air-Fuel-Ratio was starting to go lean as measured at the wideband 02 on the dyno. Given what he saw, he did the right think by keeping you out of the danger zone. LEAN IS BAD! Let me know what he says. Any chance he gave you a dyno sheet with plots for torque, HP, AFR and boost?

There are a couple of things you can do to fix the problem. #1 is to install the dual rail fuel feed that I put in a few weeks ago. Starts at post #389

http://forums.corvetteforum.com/c6-f...-force-20.html

Your car is an A6 right? Figure about 15-18% drivetrain loss. Gains with the ZR1 cam will be relatively small. The headers should have added some. 599hp -15/18% = 509/491. I don't think you are too far out of the ball park at 523rwhp

 

The 1591 kits ships with the 3.5" pulley. Boost will vary based on car's setup. Headers and cam will affect your final boost numbers. Any chance he sent you home with a dyno sheet with boost, AFR, rwhp and rwtq plotted that you could post?

 

I will get with my tuner tomorrow (I have to go up there anyway)...more to come.

Scott

 

 

The Z06 pump supports about 650rwhp on an N/A motor in an M6 car but when you tune for forced induction, the a/f ratio has to be much richer and thus it lowers capacity. Your car being an A6 is also reading lower on the dyno due to another 30rwhp or so from driveline losses. Its doing about what it should without a voltage boost.

If you had a meth kit, the meth would increase fuel system capacity and would make another 50rwhp from cooler IATs, but I know how most feel about using meth on that s/c so I'll stop there and say, good results.

 

that's good to here. Would be interesting to see if this set-up with some more boost/fuel will put 600 HP to the wheels threw the A6. If so, with the Auto and a good 60ft this should be a 9.9 second set-up. Thats one hell of a street car.

 

Congrats on the numbers. If the tuner says you were running out of injectors, you might consider the LS9 injectors. I should be done with the tune on a Magnacharger kit on a 2010 GS A6 late this week, will let you know how it works out. This one has a boost-a-pump on it, however.

Joe

 

The Edelbrock kits ship with the same Bosch 52lb injectors as used in the LS9.

 

I have one of the dyno sheets from the other day. I scanned it into my email so it is in PDF format. I can't seem to get my Photobucket account to upload it so I can upload it myself...must be because of the format. If someone has an idea on how I could upload this dyno sheet from my desktop, let me know....or, if someone else has the "clearance" to do what I can't, please PM me your email address and I can forward it to you so you can upload it for me. I want some comments and thoughts on the sheet if possible...

Thanks,

Scott

 

Display it on your screen, hit the Print Screen button on your keyboard, paste it into any program that allows you to save as .jpg and then crop out the rest of the screen.

 

PM sent, thank you!

 

 

Thank you Motorhead! Everyone is so nice on this forum. I had a chance to "open her up" last night on my way home from work...gooooood lord, it reminded me of my 700rwhp Kenne Bell GT500...but WAY more balanced at speed. I noticed on the dyno sheet that it looks like a little more fuel could be in order...so I am considering some upgraded fuel injectors to allow the Z06 fuel pump to operate more efficiently while adding more fuel which should up the anty a little bit. Give me thoughts...and thanks again to Motorhead for his help.

Scott

 

Congratulations on the E-Force install and the results. Enjoy!

 

As you can see in the graph the AFR starts to climb at about 6300rpm. This could be a lack of enough fuel volume to maintain the pressure at the injectors or it could be you've maxed out your 52lb injectors. The only way to know for sure is to measure your fuel pressure at the rail and log injector duty cycle. If you were still getting 58psi and seeing a very high injector duty cycle in the logs then the short answer is bigger injectors. If your fuel pressure was falling off then the answer is fuel volume/pressure.

Not having those two pieces of info sort of takes you to the shotgun approach. If your are planning to upgrade your injectors there are several vendors over on Camaro5 forum that sell upgraded ?75lb?injectors for the Edelbrock. Check out their V8 FI section. You'll have to retune for the new injectors. If you are doing injectors you might as well go ahead and upgrade the fuel delivery so that both rails get a steady flow of fuel. The Edelbrock setup as it comes from the factory only feeds the rear of the driver's side rail and then crosses over at the front to feed the passenger side. #8 cylinder as at the very end of the food chain. The fuel line fix involves a handful of Russells/Earls fittings and about 3' of -6 braided fuel line. You'll have the rails off when you do the injectors and this is the perfect time to upgrade the fuel lines. From there I'd go to the dyno again and see where you stand.