need answers for low numbers
06-15-2008, 02:01 PM
#1
need answers for low numbers Alright guys, Help me understand this. I hear about all these guys getting 20+ HP and TQ with a FAST 92 combo install. I have an '02 SS. With 4.10's, Longtubes w/Borla, 224/228 .581 cam, K&N FIPK, UD pulley, it was tuned by Speed inc. at 384 RWHP and 370 TQ. After I installed the 92 combo, I had it retuned by a local shop and I only picked up like 8-10 hp!! And 0 TQ!! Possible reasons?
06-15-2008, 03:39 PM
#4
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Most of the people that gain more with the FAST 92 combo have aftermarket/ported heads.
IMO, putting a good flowing intake on poor flowing stock heads doesn't achieve the best results.
The stock heads = bottleneck.
Just my $0.02...
IMO, putting a good flowing intake on poor flowing stock heads doesn't achieve the best results.
The stock heads = bottleneck.
Just my $0.02...
06-15-2008, 04:35 PM
#5
That pretty much sums it up.
Better gains are achieved when the intake represents a larger restriction (or bottleneck). The better the heads, the bigger the bottleneck the intake becomes (and the larger the reward when you swap to the deeper breathing FAST).
Your gains are textbook for an unported FAST on a stock set of heads (or even an average set of ported heads). With a premium set of heads (AFR, TFS, ETP, etc.) you would have likely seen 10-15 and in the same scenario. Now with a properly ported FAST (and the premium set of heads) you could have seen the 20-25 RWHP scenario you were hoping for.
Looks to me that you either didn't do enough homework before you pulled the trigger or were given some bad info expecting those kinds of gains on a stock unported FAST....especially with stock heads involved.
The good news is that if you ever step up your cylinder heads you will unlock a little more with the swap....you just didn't take full advantage of it now in your current situation
Tony
06-15-2008, 04:36 PM
#6
miss match setup Like the other guys said differant dyno you want to stay with the same if possible but on that combo Im supprised you didnt loose your tq numbers. In my opition, with the 92 combo Definately need more info what was your air fuel ratio what rpm level did they take your car to most of the time you'll see the most power with that combo around the 6200 to 6600 rpm level. their is a articale in the gm high tech magazine July 2008 addition that has that combo tested and look at the rpm range where it made its horsepower.
06-15-2008, 07:56 PM
#7
I'm all about buying a set of heads. I'm ready to now, my problem is I don't have the knowledge to Identify exactly which heads are best considering my current cam and other bolt-ons. But I did know that WITH a set of heads, I wanted the 92 combo also, so I got it and installed it while trying to determine which heads to get.
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06-15-2008, 08:12 PM
#8
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Send your intake to Tony Mamo along with a check for a set of massaged AFR 205's. When you get everything back and reinstall then tune you'll have nothing but smiles when talking to your combo.
06-16-2008, 12:58 AM
#10
don't shop for peak numbers, you MIGHT be disappointed.. of course you might not, but you also might hit the bullseye with 1 dart.
07-05-2008, 01:51 AM
#16
So, after a long decision process, i've decided to go with AFR 205cc's with 66cc with my 224/228 .581 114LSA cam along with my FAST 92 combo and SLP longtubes, i'm also having 42# injectors installed. i've decided to make the trip to Schaumburg (6 hour haul) and put my baby in Speed Inc.'s hands. As of now, my car sits right at 400rwhp and 370tq. What kind of numbers should I expect after install of heads, injectors and tune?
07-05-2008, 10:06 AM
#17
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Think your working with Larry on this?
would recommend having the AFR heads milled to 62.5cc its a option when ordering the heads, provided its stock short block? Also cometic .045" gaskets, kind of imperative actually, I find a 3.990" bore gasket fits the 205's chamber best.
The injectors, 42 is bit big, remember thats at 43.5 psi, theirs better driveability with some of the lesser flowing bosch injectors, were testing some 33lbs/hr injectors, expecting good results.
would recommend having the AFR heads milled to 62.5cc its a option when ordering the heads, provided its stock short block? Also cometic .045" gaskets, kind of imperative actually, I find a 3.990" bore gasket fits the 205's chamber best.
The injectors, 42 is bit big, remember thats at 43.5 psi, theirs better driveability with some of the lesser flowing bosch injectors, were testing some 33lbs/hr injectors, expecting good results.
