HELP Set-up results inside
HELP Set-up results inside Car is 99 A4 T/A with a iron 6.0 with Stock L92 heads milled .025,Hotcam,Long tubes,stock Ls3 Intake,Full exhaust and custom cai.Stock Stall
Last edited by Quick99TransAm; Apr 27, 2011 at 05:17 PM.
Tune EFI Alchemy In Florida tuned the car.Trying to figure out why the power is so low car runs strong. I have seen identical set-ups well over 400 wheel.I have a copy of my tune If anyone want to take a look and let me know.Also what springs do you recommend?
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Kind of a dyno newb here but, how come I see all these people coming back from the tuner with questions as to why their setup is producing the power it should be? My thinking is, if the tuner can't tell you what is wrong with it, you are getting it tuned by the wrong person.
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Verdad Gallardo i'd look at the pac 1218s. i'd also check and shim if needbe.
i'd also opt for some hardened pushrods. given its lift and lobes, that cam shouldn't give you any problems using stock diameter.
i'd also opt for some hardened pushrods. given its lift and lobes, that cam shouldn't give you any problems using stock diameter.
Kind of a dyno newb here but, how come I see all these people coming back from the tuner with questions as to why their setup is producing the power it should be? My thinking is, if the tuner can't tell you what is wrong with it, you are getting it tuned by the wrong person.
to the OP, my guess with the stiffer springs and higher lift/duration cam is your having pushrod deflection and/or valve float by not having the proper length pushrod.
if the heads were milled, you will almost certinally need a shorter pushrod.
what thickness head gaskets are you runinng?
yes, after looking at the dyno sheet one more time, its definally falling apart above 5500 RPM. i can almost bet my paycheck that you have one or more of the following problems...
1. inferior valve spring, especially with the heavier L92 valves.
2. weak pushrods
3. too much lifter preload causing the valves to hang at higher RPM/oil pressure caused by incorrect length pushrods.
1. inferior valve spring, especially with the heavier L92 valves.
2. weak pushrods
3. too much lifter preload causing the valves to hang at higher RPM/oil pressure caused by incorrect length pushrods.
Pushrods Yeah heads are milled .025 push rods are stock length.But with the hot cam it says it requires .025 longer pushrods because the base circle of the cam is smaller than stock. I will use my length checker to verify.I assumed preload/Length was good do to the valve train being so quite.head gasket is stock LS3 which compressed is .051
Ideally when checking for pushrod geometry, I always use a solid lifter to get the correct length--eliminates any guess work on false lifter pre-load, I know with the LS engine, having to pull the head to check lifters is a chore. If your lifters are in good enough condition to accurately display pre-load, then you should be able to use the an adjustable pushrod and test valve spring to get the correct length
Are those the Yellow LS6 springs? I thought those were only rated to .550"
Are those the Yellow LS6 springs? I thought those were only rated to .550"
your running LS6 valve springs with those giant valves? your begging for valve float!! Graph shows it really evident. get something that can handle those valves at high rpms.
Thanks Thanks for the advice guys.Oh the ls6 springs I got from a site sponsor say that they are good to .570 and was told by the sponsor that they would handle L92 valves beacause cam is only .525 That is the only reason I bought them.Looking for new valve springs now.
the Hotcam might not be the greatest cam out there but it's not worst one either.if it was me,i would do the following:
degree the cam to verify the ICL.
check for the proper preload/pushrod length.and get rid of the stock pushrods!the stock pushrods are just good enough for the OEM cam.
use at least a PAC 1518 spring.
degree the cam to verify the ICL.
check for the proper preload/pushrod length.and get rid of the stock pushrods!the stock pushrods are just good enough for the OEM cam.
use at least a PAC 1518 spring.
Set-up Thanks for the advice guys.I pulled my valve covers yesterday so that I could check pushrod length and found that when I tighten the rocker down with stock pushrod the valve opens slightly while the cam is on the base circle and #1 is a tdc I checked multiple cylinders intake and exhaust.According to my math I need 7.35 pushrods does this sound about right.Heads are milled .025 and I am using stock LS3 head gasket which is .051 compressed.
