Q-jet and Holley - Page 2

Adger Smith · 12-18-2011, 05:19 PM

Get the turbine off!!!, put in a fresh set of plugs and tune by reading the plugs.
Remember: It would be correct to assume the Holley told you the engine was in mechanical sound condition. Those Holley EGT's were not out of the ballpark. Don't just chase anything & everything. Don't do needless changes.

Darrin Christen · 12-18-2011, 09:27 PM

What is a top hat or turbine? Is this something used on the dyno only?

Weekend Racer · 12-18-2011, 09:50 PM

Darren,Yes the turbine is only dyno supply air from outside
Thank!

Mickey Whaley · 12-18-2011, 09:57 PM

Quote:

Originally Posted by Weekend Racer

Chevy small block 350,make 597 hp with holley 750, and drop to 562 with Q-Jet .What can I do?

Any input Thank,

why did you take the 750 off??

Weekend Racer · 12-18-2011, 10:03 PM

Mickey, Just dyno test ,on my ss engine.

Mickey Whaley · 12-18-2011, 10:15 PM

Quote:

Originally Posted by Weekend Racer

Mickey, Just dyno test ,on my ss engine.

Q jets are funny get a good one it really will be a surprise the difference!

Weekend Racer · 12-18-2011, 10:37 PM

Yes ,mine need some upgrade or tuning !
Thank,

Mike Taylor 3601 · 12-19-2011, 10:54 AM

Turbine is used to mearsure air flow (cfm) engine is using,usaully has cat (carb air temp) sensor mounted in it also.
My engine does'nt make near that power, pure stocker,my Q jet will match HP all way through and have about 3lbs. torque less @ peak than 750 holley. I compared on 351C on time w/ my q,jet 750&850 dbl. pumps and had same results.
I leave turbine off and mount cat sensor on carb to where it picks air temp going in carb so correction is repeatble.

Mike Taylor 3601

eddie c · 12-22-2011, 04:59 PM

Quote:

Originally Posted by Mickey Whaley

Q jets are funny get a good one it really will be a surprise the difference!

My apologies for going a little outside of this thread, but I have always
wondered why some QJs perform much better than others. I realize there could be many theories on the subject, what makes one QJ fly and the other a dog! tks ed

Weekend Racer · 12-23-2011, 10:12 AM

For myself I have a bone in my engine ,it is the Q-jet, or a distribution problem from the spacer and intake.

I hope , I am not the first one with an drop of performance when we switch the Holley for the Q-jet?
Thank,

12-18-2011, 05:19 PM	#1
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: Q-jet and Holley Get the turbine off!!!, put in a fresh set of plugs and tune by reading the plugs. Remember: It would be correct to assume the Holley told you the engine was in mechanical sound condition. Those Holley EGT's were not out of the ballpark. Don't just chase anything & everything. Don't do needless changes. __________________ Adger Smith (Former SS)

12-18-2011, 09:27 PM	#2
Darrin Christen Member Join Date: Mar 2007 Location: Des Allemands, LA Posts: 365 Likes: 8 Liked 1 Time in 1 Post	Re: Q-jet and Holley What is a top hat or turbine? Is this something used on the dyno only? __________________ 4878 SS/GA 66CHEVY II

12-18-2011, 09:50 PM	#3
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 68 Likes: 1 Liked 1 Time in 1 Post	Re: Q-jet and Holley Darren,Yes the turbine is only dyno supply air from outside Thank!

12-18-2011, 10:03 PM	#5
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 68 Likes: 1 Liked 1 Time in 1 Post	Re: Q-jet and Holley Mickey, Just dyno test ,on my ss engine.

12-18-2011, 10:37 PM	#7
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 68 Likes: 1 Liked 1 Time in 1 Post	Re: Q-jet and Holley Yes ,mine need some upgrade or tuning ! Thank,

12-19-2011, 10:54 AM	#8
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,380 Likes: 368 Liked 317 Times in 108 Posts	Re: Q-jet and Holley Turbine is used to mearsure air flow (cfm) engine is using,usaully has cat (carb air temp) sensor mounted in it also. My engine does'nt make near that power, pure stocker,my Q jet will match HP all way through and have about 3lbs. torque less @ peak than 750 holley. I compared on 351C on time w/ my q,jet 750&850 dbl. pumps and had same results. I leave turbine off and mount cat sensor on carb to where it picks air temp going in carb so correction is repeatble. Mike Taylor 3601

12-23-2011, 10:12 AM	#10
Weekend Racer Junior Member Join Date: Feb 2003 Location: P.Q. Posts: 68 Likes: 1 Liked 1 Time in 1 Post	Re: Q-jet and Holley For myself I have a bone in my engine ,it is the Q-jet, or a distribution problem from the spacer and intake. I hope , I am not the first one with an drop of performance when we switch the Holley for the Q-jet? Thank,