Need help guys.
Thread Starter
Racer
Joined: Apr 2008
Posts: 257
Likes: 1
From: Chicago ill
Need help guys.
Ok guys I had speedinc put A&A kit on my camed 01 Zo6 it made 607hp that was last year. A shop had a open house today and z was dyno again it put down 434hp and A/R was reading 10.1 @10psi... I checked for vac leaks cant find anything. Maybe the intake gaskets leak only under boost? Need some help .
Last edited by z0sleeper; Apr 19, 2009 at 12:42 PM.
Burning Brakes
Joined: Jan 2004
Posts: 1,158
Likes: 6
From: Winter Springs Fla
Its hard to fudge almost 200 whp .
Unless the new shop dosnt know how to operate their dyno and had the brake set to about 30% ,, lol
My clutches were going out and i went from 655 down to 480ish but it wasnt really that noticable on the street under normal driving .
If the OP has like a level 2 clutch and has been doing some spirited driving over the last year , i would think the clutch is glazed over .
Thread Starter
Racer
Joined: Apr 2008
Posts: 257
Likes: 1
From: Chicago ill
Nobody dyno a good number that day. But my A/R is reading low 10's
clutch has about 1,000 miles on it and it's a ls7 Not too sure that its a clutch problem since it spins the m/t 315 drags in 3rd gear roll
clutch has about 1,000 miles on it and it's a ls7 Not too sure that its a clutch problem since it spins the m/t 315 drags in 3rd gear roll
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
You keep saying your BOOST was at 10 PSI! What was it before!
You would not have a Vacuum leak you would have a BOOST leak if it is lower than before!
The AFR @ 10.1 is rich but it is safe at that ratio when under full BOOST and top RPM.
Let us know!
Thanks,Matt
You would not have a Vacuum leak you would have a BOOST leak if it is lower than before!
The AFR @ 10.1 is rich but it is safe at that ratio when under full BOOST and top RPM.
Let us know!
Thanks,Matt
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Thread Starter
Racer
Joined: Apr 2008
Posts: 257
Likes: 1
From: Chicago ill
Now the boost is the same but A/R 10.1 @ 10psi
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
If you have Methanol is it possible the **** got turned up to a higher level? Mine is set at at 3.5 position.
Thanks,Matt
Drifting
Joined: Mar 2006
Posts: 1,872
Likes: 7
From: Richmond VA
Not sure, but the A/F difference is prob due to loss in power. It is throwing enough fuel for 600hp and you are only getting 430. Have you checked all the clamps? Never tried it, but you might be able to feed some smoke into the intake on the blower, rev it up and see if any smoke leaks anywhere.
Are all 8 cylinders firing? Check the temp of each header tube. Some spit on their fingers and touch each tube. I bought an inexpensive thermal IR gun. Maybe one isn't firing all the time. If you have a slight misfire, you probably will not be able to hear it. I have found so many bad, brand new plugs that I ALWAYS do this test after swapping them.
Are all 8 cylinders firing? Check the temp of each header tube. Some spit on their fingers and touch each tube. I bought an inexpensive thermal IR gun. Maybe one isn't firing all the time. If you have a slight misfire, you probably will not be able to hear it. I have found so many bad, brand new plugs that I ALWAYS do this test after swapping them.
Thread Starter
Racer
Joined: Apr 2008
Posts: 257
Likes: 1
From: Chicago ill
No meth on the car just pump gas..
Should i change the plugs?
I'm also thinking i might have a bad boost gauge since it's electric and not reading the right vacuum .... when the car is running i get about 2 to 4inches of vacuum I put a diff shop gauge and says 13 inches of vacuum. So that tells me i might not be really getting the right boost . What do you think?
Should i change the plugs?
I'm also thinking i might have a bad boost gauge since it's electric and not reading the right vacuum .... when the car is running i get about 2 to 4inches of vacuum I put a diff shop gauge and says 13 inches of vacuum. So that tells me i might not be really getting the right boost . What do you think?
Drifting
Joined: Mar 2006
Posts: 1,872
Likes: 7
From: Richmond VA
As I mentioned, new plugs do not guarantee much. Even a new one could be bad. Or there could be a problem with a coil, wire, etc. Check each tube right at the block and make sure they are all the apx same temp.
Thread Starter
Racer
Joined: Apr 2008
Posts: 257
Likes: 1
From: Chicago ill
Thread Starter
Racer
Joined: Apr 2008
Posts: 257
Likes: 1
From: Chicago ill
Ok guys I found the problem. The MSD boost pump has adjustable screw with locking nut.I don't think the locking screw was tighten down. The fuel pump was getting 19.8 volts while idling. It's been raining here in chicago so have to wait til tomorrow to get on it and see some boost action.
Thanks guys
Thanks guys