750 rpms...untuned (click on picture for link to vid):








Now I remember why I bought the Harrop. The car idles like a stock motor with *maybe* a cheater cam. If that. It is super quiet at idle and cruise with 2" headers, and Magnaflow exhausts (no cats in this video although there will be cats installed). ZERO drone at ANY rpm period. My old 402 and 1 7/8" headers droned around 1600-1700rpm in 6th gear.

Zero cam surging. I drive 25-30mph in 4th gear perfectly. I put the cruise on in 6th gear at 55mph (1300-1400rpms), and the motor just hums along perfectly for 30+ miles on the Parkway (law abiding citizen).
I can hit it at 2k rpm and it punches you in your chest and pulls instantly to 6850rpms (my current rev limiter--I'm going to increase it to 7100rpm). It just slams right into the rev limiter. It revs so freakin fast, and pulls so hard it's ridiculous.

The car will go on the dyno this Friday, and depending how long it stays on the dyno, I may take it to E-town to ice skate a bit after. At this point, I don't care if it only makes 550hp. I have no idea if the new cam makes more power or less. The power this thing makes with the factory-like idle/drivability is epic. I did get caught up in the #'s for a minute, but then I had to remember what my criteria while building it was (I was trying to build a supercar Ls engine that could have basically come from the factory due to drivability characteristics--N/A of course). That doesn't mean I don't hope to see a 6xx rwhp # and the mph to back it up, just that I won't be crying in my cornflakes if it falls short.

The downside to this intake is that you have to learn how to drive again. The throttle response is like nothing most have ever experienced. It wants to rev like a banshee. The upside is that it's really hard to make the car stall, and you can basically let the clutch out at idle and cruise around a parking lot with zero gas pedal. This thing is crazy.

Update story since engine dyno and tuning:

After Ed and Va Speed tuned my harrop/468 on their engine dyno, I decided to build a bigger badder higher HP and rpm motor for the GTM and put this motor in my c6.

I had the motor shipped from Va Speed to Erik @ HKE for a much larger cam install. Erik then sent the motor to Kevin Smalley of Smalley Automotive and Performance in Point Pleasant Beach to install the 468 and a z06 fuel pump in the c6. Kevin installed it the c6 and had it back to me LIGHTNING quick.

Kevin's work is outstanding. His prices are very fair and consistent. I've never seen my car and engine bay so clean. His attention to detail really stands out (highlighted by calling me to determine the exact clutch I had in the car so he could find out the exact torque specs for reassembly). Kevin is well known in the hardcore Corvette and racing scene. He is just "one of us" who happens to own his own shop. He seems to understand the nonsense in this industry and doesn't subscribe to it. I'll probably be calling him a true friend before all is said and done. Thanks to Kevin, Troy, Dan, Dave, (and I can't remember the other tall guy-sorry). They all went above and beyond. It's nice when you can have true trust in the people working on your car.

I need to thank Ed Hutchins of Va Speed. I've been dealing with him since December since I purchased the Harrop. He has consistently been professional, helpful, and honest. His tune started the engine right up even with the new cam. I also appreciate the after-the-sale support. He has gone above and beyond to see this build through as well. He has looked at logs, answered the phone and sent me files late at night. He's taken away time from his family to modify and send me tunes to tweak the tune as I drive and live with the car. This is all after the fact of him doing the initial tune with the other cam. I hope you can come up to NJ to do the final tune in person!! Tell Shawn and Doug to let you go. I'm sure Kyle wants you here too for his engine tuning.

Last but not least, I need to thank Erik Koenig for building a BAD *** engine for me. Erik has become one of my favorite people period. You just have to talk to this guy to love him. He is as honest as they come. He will educate you and doesn't make you feel dumb while he is explaining things. He will not sell you snake oil. He won't make it seem like he does secret voodoo black magic stuff that no other shop can do. No hype. No ego. Just a love for doing things right. He will tell you that if you do xyz correct with this combo, it will make roughly this power no matter who builds it (assuming the person does the quality steps while building it). Very fair price as well. He is building the new motor for the GTM. This one should be pretty ridiculous for that car.

I can't forget to say thank you to my boy Powerlabs. Between helping me with my other car project, overnighting the HP Tuners, and overall moral support, this build would have sucked without him. I know some people here get into it with him on the forums, but I can say that if you know Sam in real life, you will see he is a well meaning, good hearted car nut always willing to help out. Glad to have you as a friend buddy.

I've had my car for almost 5 years now...I've been bored with it, had it for sale, etc... I can say I'm in LOVE with it again. I can't wait for Pocono in the Spring.

 

CONGRATULATIONS on getting it all together! Man, that thing really does idle like a stock car! Unbelievable for a 468 cubic inch, high compression, fire breathing monster . Now THAT is a N/A motor done right

And thanks a lot for the shout out Its always a pleasure wrenching with you buddy, and I owe you big for helping me with my engine swap, twice! Can't wait to see this beast in action!

 

pretty smooth, thats 11:1 isnt is Roberto? pump gas friendly.. good talking to you today.. we should race sometime. Nothing beats n/a and 600+ at the wheels !

 

Thanks man. I hope you are back in NJ soon so you can drive it.

11.2:1. Yes pump gas friendly. You know better than anyone how Erik builds them. Good talking to you too. I sent you an email per our conversation.

 

Damn Stage 7... My 440 is really radical compared to that. How much was the entire conversion? You have me interested in doing this as an alternative to going with the Fast 102. Any information you could provide would be of great help. Looks Great! Thanks!


Jason

 

You would make more top end with the fast.

Roberto we need to get those coils off the valve covers now and dress it up a bit more under there.

 

Thanks. Call Va Speed and speak to Ed about the Harrop. That's where I bought it from. The cost changes with that day's exchange rate.

Possibly. I know Erik feels that way. Robz would say otherwise and has results proving otherwise. I'm on the fence, but would be happy to dyno one back to back if someone is willing to send me a FAST w/throttlebody. I would cover the dyno/install costs. I would send it back after the test of course. Regardless of the outcome, no way a FAST idles even close to the Harrop.

They are already off. Kevin and his guys took care of it.

Thanks for your email.

 

Have you ever known Erik to be wrong ? ...LOL
Enjoy that thing man !

 

Good point.

I think a lot of it has to do with overall combo. Cubes, heads, cam, etc where one may out perform the other. The Harrop will allow you to over cam the car, make more power, and still be civil where the FAST wouldn't be. I actually wish I went bigger on the cam. Erik was shocked at the idle video with the cam he spec'd.

You're right, I'm just going to enjoy it...

 

Hi Stage 7,

Did you try or intend to run some 60 mph to 130 mph???

Some info about it with acceleration time there:

http://forums.corvetteforum.com/c5-f...ults-here.html

Christian

 

Hi Christian,

I will see what I can do. I doubt it will have much for the strong FI guys. That's a test they really shine in. Really anything from a rolling start or past 150mph.

 

I agree 100%...against a turbo below your car ideal upshifting power-band is impossible to compare...

Nonetheless, it might be interesting for everyone to see how much faster than a Ferrari Enzo or a Porsche Carrera GT your car is now!!!!!

Just punch her on a "Private Road Straight Line", starting in third gear upshifting to fourth...and you have it recorded pretty accurately through HP Tuners.

Let us know
Christian

 

Hi Stage7,

With your 670 rwhp SAE / 632 rwtq SAE and the proper gear ratios in a Z06...you can realistically expect to be easily below 7 seconds in this exercise, don't you think???

Christian

 

Roberto I'd put money on you vs FI. Look at your power.

 

In the 6.5 seconds??????????
FASTER??????????

Here is the lsit of cars measured with VBOX:

4.15*900+ rwhp Supra, 88mm turbo, 30 psi, TH400 Auto, ET Drags
4.90*Divexxtreme / RWD 996TT / 20 psi / 2 shifts
4.9 - 940 rwhp Supra (35 psi)
5.1 - 840 rwhp Supra (30 psi)
5.4 - 1,000 rwhp TT Viper
5.6 - Bugatti Veyron (estimate based off of verified 100 - 200kph time of 4.8)
5.9 - GSXR 1000 with bolt-ons
5.98*C5 Vette with big motor and NOS
7.56*C5 Z06TT (APS Turbo, no cats, stock muffler, 573 rwhp @ 9.5 psi) / 1 shift
6.1 - Saleen S7 Twin Turbo
6.69*Dr. Jitsu / 996 GT2 / 700 crank HP / 1-shift
6.9 - Mosler MT900S
7.0 - Ferrari Enzo
7.3 - Porsche Carrera GT
7.73*997TT with ECU flash / 2 shifts
8.6 - Corvette C6 Z06
8.86*Stock 997TT / 32 degrees, Tiptronic (0 shifts)
8.9 - Mercedes SLR McLaren
9.10*993 Ruf R Turbo 490 HP / 2 shifts
9.4 - Lamborghini Diablo VT 6.0
9.5 - Ferrari F430
9.6 - Ferrari F50
10.06*996TT with ECU flash / 1 shift
10.9 - Lamborghini Murcielago
11.7 - Ferrari Challenge Stradale
12.1 - Lamborghini Gallardo

Christian

 

He's making 680 and you post up 800 and up, 1000 hp $200,000 plus cars...

Ya ok Christian

Its implied that you race within your own levels but I don't know?
Maybe you try and take on cars making 300+hp more than you do ? If so all the power to ya

 

Is Stage7 engine making 670 RWHP???

If yes, that is converting in ~ 740 Flywheel HP...

Is that correct, or is there something I misunderstand?

Christian

 

My car was 5.6 seconds (based on one drag strip pass). (0 psi)

 

Two upshifts on face plate (and adequates gear ratios to match your engine power band!!!) with drag radials...
Your C5 Z06 little daily driven 388Ci na reving 8800 rpm (ITB, and the rest...) can be added to the list...in par with the expensive Bugatti Veyron.

What a performance...

Christian

 

My ideal gear ration would be a 4.88 but we can't get them. ( A big deficit in my combo.)
I can't believe how fast the Bugatti accelerates even down that low in speed. Now I have a goal to get to 5.5.lol