Dave Schotz

Hey guys... Just installed Ported Blower, Z06 TB, BTR Stage III Cam, RPS BC2 Clutch, Katech H/E, ID850 injectors and LPE 710 Kit with the 2.3 pulley.

My car made 630 RWHP with just the LPE 710 kit, and is now making the same 630 RWHP with these mods.

It is much warmer out then my prior runs, but I'm thinking it could be loosing boost possibly?

Car starts at 16psi and by 5500 is roughly 13PSI? Does this seem right for a 2.3 Pulley?

Any thoughts on where the boost could be 'sneaking off too'?

Appreciate any advice/thoughts?

Thanks,
Dave

K B Vettin

belt slip? i'm maxing out with 17psi with 2.3 upper and stock crank pulley

Dave Schotz

Thanks KB... do you have a dyno graph? What's your PSI at 6,000 RPM?

Thanks!

Dave

K B Vettin

I don't have a graph that shows that handy. I have dash logic and will get to 6k rpm's in 4 on my way home tonight and report back.

Dave Schotz

Thank You!

Dave Schotz

anyone else with 2.3 Upper stock lower pulleys and dyno graphs/boost graph?

Thanks,
Dave

whatcop?

Yeah boost should hold steady. Either belt slip or someone didn't raise your Kpa value.

K.Shupe

This might help Dave, lots of good information on pulley and idler sizing to prevent belt slip. Also discussion on belt length and brand.

http://forums.corvetteforum.com/c6-c...d-testing.html

Dave Schotz

Thanks whatcop!

The tuner says it almost looks like Valve float up top, the way the power is fluttering? I'll try to post a pic of the graph in the morning.

He is wondering if could be a clogged cat possibly?

I figure I'll pull the plugs and put stock tb on first, if still showing flutter up high, then will swap back to 2.6 pulley and belt and see if that corrects it.

If that doesn't work, cut out the cats.

Could it be a "wobbly valve" issue?

Thanks for all your help!

Dave

ZBADESTZ@Straightline

My other vette lost power from cats melting.....

whatcop?

Wouldn't clogged cats make boost increase?

whatcop?

Boost is mechanical so I would think either slip or bypass valve. Zip tie it shut and do a pull.

Dave Schotz

While I'm sure they'll know where it is, I plan to go there tomorrow and do some work to help.

Where is the Bypass valve? Have an image?

Thanks,
Dave

whatcop?

If you are looking at the snout it's on the drivers side of it. It's a small arm connected to the black canister. When the car is off you can manually move the arm.

Dave Schotz

Oh yeah, is this the item that the LPE kit includes a small 'calibration' tool? (Plastic T looking thing to adjust the small arm that connects it?)

Thanks,
Dave

whatcop?

Scroll down the page and they have photos of the supercharger and bypass valve


http://www.corvetteactioncenter.com/..._pursuit3.html

whatcop?

Probably adjusts the screw on there. Hopefully it's adjusted properly to where it's not bleeding boost off.

Dave Schotz

Yeah, not sure. So how do we zip tie it shut? Just disconnect the solenoid completely? And the zip tie the bypass throttle blade?

Thanks!
Dave

ace32x

belt slip and your stock manifolds and cats is the issue imo

Dave Schotz

Thanks, if anyone can email me graphs with their boost graph on the dyno sheet it would help me compare.

I'll give you updates later today!

Please email me graphs to dschotz AT earthlink.net