HELP! Power loss after 5k.
HELP! Power loss after 5k. I have a stainless steelworks kit with a T-76 Q-Trim Turbo. I’m having a problem with power loss at 5k. For some reason she runs like a champ 2k-5k making 390rwhp at 5psi, but at 5psi it drops about 200hp and we have to let out of it. I have the spark plugs gapped at .40. Do you think that it’s blowing out the spark? What other problems could it be? The wires are perfect. The only other thing I could think of that might be happening is the valves might be floating due to back pressure. I still have the crappy stockers in there, but I will get some 918’s if need be.
Here are some other components that I have installed that might be useful:
Racetronix PnP Pump
Motoron 60# injectors
Spec 3 clutch + billet FW
ARP Pro Series Rod Bolts
TurboXS RFL BOV
And a bunch of others just these are the ones that I thought might relate.
Any help is greatly appreciated.
Thanks,
Here are some other components that I have installed that might be useful:
Racetronix PnP Pump
Motoron 60# injectors
Spec 3 clutch + billet FW
ARP Pro Series Rod Bolts
TurboXS RFL BOV
And a bunch of others just these are the ones that I thought might relate.
Any help is greatly appreciated.
Thanks,
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Joined: Oct 2004
Posts: 371
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From: Just outside of Palm Springs Ca.
You are likely have valve float, I have seen many with this problem using the stock springs, they have very little pressure to begin with and if you add boost to that,the intake valves start having a hard time controlling the motion. Try the 918's and i will bet you have no more problem. I would say though the gap could be a little tighter if you run more than 5psi.
-Bryan
-Bryan
Trending Topics
Are the 918's the strongest of the Comp springs, or just the next step up from LS6 springs?? What are the other Comp ones?
Originally Posted by PurEvl
valve float...get the 918's in there
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Originally Posted by FastKat
Are the 918's the strongest of the Comp springs, or just the next step up from LS6 springs?? What are the other Comp ones?
Kyle
The 918's are the strongest beehive spring comp makes. They do make a stronger dual spring setup, but most people don't need them. As someone else replied earlier, REPLACE PUSHRODS anytime you upgrade anything in the valvetrain, the factory ones bend easy.
i've been researching this topic too in preparation for my sts kit. i'd say it's valve flutter. i think there's some specials/gp's going on for comp cams stuff right now in the sales forum. of course, once you're there you might as well do PR, TI retainers, rocker arms........it never stops!
Does too strong of a spring cause additional resistance when the engine is running, or is one spring compressing offset by another spring releasing, etc?
Originally Posted by gametech
The 918's are the strongest beehive spring comp makes. They do make a stronger dual spring setup, but most people don't need them. As someone else replied earlier, REPLACE PUSHRODS anytime you upgrade anything in the valvetrain, the factory ones bend easy.
As far as the question(s) about the BOV: It seems to be working good for me. Im pretty sure that its loud, but with my 3" open downpipe its still kinda hard to hear. I can hear it. Its just not crazy loud over my exhaust.
I will definately upgrade the pushrods, but Im not getting into the rocker arms and titanium retainers yet. Im going to purchase a set of 6.0 heads have them ported and then I will buy the valvetrain components for those heads. Right now Im just trying to fix the current problem without getting all the way down to "Well I might as well pull the motor and go all forged etc."
Thanks for everyones help.
I will definately upgrade the pushrods, but Im not getting into the rocker arms and titanium retainers yet. Im going to purchase a set of 6.0 heads have them ported and then I will buy the valvetrain components for those heads. Right now Im just trying to fix the current problem without getting all the way down to "Well I might as well pull the motor and go all forged etc."
Thanks for everyones help.
No, with FI you need more spring than stock. Adding boost makes it harder for the valves to snap open, because the charge is pushing the valves closed.
I made some changes to my combos and started to float my Crane 832's. My car dropped like a stone at 6200. Intmd8 and I did some research, and went with the Comp 977's. Now the car peaks up at 6500-6600 again, and now just appears to be intake limited.
I made some changes to my combos and started to float my Crane 832's. My car dropped like a stone at 6200. Intmd8 and I did some research, and went with the Comp 977's. Now the car peaks up at 6500-6600 again, and now just appears to be intake limited.
Originally Posted by Pro Stock John
No, with FI you need more spring than stock. Adding boost makes it harder for the valves to snap open, because the charge is pushing the valves closed.
I think you meant to say:Adding boost makes it harder for the valves to snap closed, because the charge is pushing the valves open....
Right??
You guys are too critcal.