92CamaroDE

Curious if I'm where I should be or if there is more left in it. Hoping to hear from others experiences with similar combos. I have a 92 Camaro 350 Vortec TBI Hotcam. 700R4, 323 rear, 2600 stall, hooker headers merging to 3" exhaust, modified stock air cleaner, 50mm TBI. Performer RPM, Running 1.52 rockers so lift is right at .500. Last several passes 13.3 at 104 on street tires. I did just put the rockers on it since my last trip to the track. Might hit 13.2 at 105 but don't think much more. Had stock Vortec rockers on it. Comp Cam roller tip now. I'm getting myself confused lately reading posts where similar combos are at 400 hp. I can't be anywhere near there with my trap speed. Dont think there is much more in it without changing some more parts. I'm hoping to get into 12s at some point but running out of ideas.

Fast355

iTrader: (2)

What track, whate state and what time. Curious as to the DA corrections. What are your WOT shift points? What is is your Baro KPA and your MAP KPA reading at WOT shift points.

You want full roller not roller tip FWIW. 1.6s rollers wpuld likely give 8-10 hp more upstairs.

Post a slip so I cam see an overall picture of the entire run. You can lose a tremendous amout of ET in the first 60'.

You probably want to shift around 6,000-6,200 on 1-2 and about 5,800-6,000 into 2nd.

92CamaroDE

Fast355. Thanks so much for replying. Track is Cecil County Dragway in Maryland. I'm from Delaware. We are at sea level so 100 Kpa at key on and I drop to 98 Kpa at 6000. I do shift at 6000 into 2nd and into 3rd. My 60' is 1.9 to 2.0 depending on the run. I would have loved to have gone to 1.6 rr but my heads have .500 max lift so I limited it to 1.52. I read posts where others are seeing 400hp with this combo and I calculate about 340 with my time and mph. Just seems to be a huge difference. It runs really well and doesn't seem like I'm missing something. I'm maintaining 12.8 or so AFR at full throttle and my Kpa isn't dropping dramatically so don't think the TBI is holding me back. Exhaust is as free as I can get it with 2.5 mandrel bends from headers to flowmaster scaviging Y to 3" magnaflow muffler. I'm just wondering if people are actually seeing 12s with similar combos to mine. Or wondering if some of these posts are people guessing what they run and just assuming they are making 400hp. Not really using Dyno or 1/4 mile data. Hoping to find someone with similar combo that has 1/4 mile or Dyno data showing 400hp or 12s. If so maybe they would share what they have done and see if maybe I missed something.

Fast355

iTrader: (2)

A 100% stock vortec long block with a LT4 Hotcam is capable of 380-400 hp. I made 290 RWHP @ 5,600 and 330 RWTQ @ 3,950 through a 4L85E and GM 9.5" 14-bolt with an almost identical cam. That driveline eats a solid 25% of the power that is going into it, especially since it is turning a massive clutch fan. My setup was GM 283' part number 350 Vortec short block, 906 Vortecs cut for 2.02/1.60s, Lunati Bare Bones 218/228 @ .050, 1.6:1 rockers for .536/.536" lift. The Lunati cam was advanced 6* total in my setup compared to the typical 3* of the Hotcam. I run the GM Vortec marine intake and Doug Thorley Tri-Y headers into dual 2.5" pipes, dual 2.5" Thunderbolt metallic core cats, into a dual in/single out Walker Dynomax bus muffler and a 3.0 mandrel bent tail pipe. So I figure my setup was making 385 HP at the crank. The tune was fairly rich and the timing backed off a bit as well from optimum performance since this setup often pulled around 12,000 lbs.

As far as getting to 12s is concerned, yes it has happened. 86LG4Bird got his car to a 12.9 with the same basic long block. His had a CCC Q-Jet and factory exhaust manifolds on it.

Fast355

iTrader: (2)

As far as HP calculators from ET go. They are semi accurate at best. Weather conditions can hurt your ET by up to 1/2 second on any giving day. Cool engine vs Hot engine can also effect ET by several 10ths.

I have a 4,200 lbs car that I have taken down the track at a 12.5 @ 110 on a 2.2s 60'. It put down 390hp/410tq at the wheels. The ET HP calculator shows it should run a 13.1 or 13.2 at best, FWIW.

92CamaroDE

Thanks so much for sharing your info. I see there is definitely more in it. Helps to get hear from someone directly that has experience with my setup. I will have to keep working at it. You do have a better exhaust than mine. I have the Hooker 2055 headers modified with v band clamps to eliminate the ball and socket restriction at the collector they had. They flow into 2.5" mandrel bent pipes merging into a Flowmaster scavenging Y to 3" all the way back to a single inlet daul outlet Magnaflow. My system tucks up nice and tight and doesn't hang down or rattle against anything which I really like and it sounds pretty decent. I may go ahead and look at larger headers that have 1 3/4 primaries instead of my 1 5/8. Might pick up a little there. Also, may go ahead and try to find a dyno shop and work on my tune a bit more and get some rear wheel hp numbers. I believe I have my SA in pretty good shape. 32 degrees over 3000. I seem to recall I based my curve on a post I saw of yours somewhere. I have EBL flash so pretty easy to make changes. Thanks for the help. Much appreciated.

92CamaroDE

Hadn't posted in quite a while so thought I would take a minute and let everyone know how I'm making out with my Camaro. Over the summer I swapped out my 350 to a 383 stroker from Blueprint. I stayed with the Vortec style heads so everything bolted right up. Also swapped in my LT4 hotcam from my 350. I figured the cam that came in the 383 would be too much for TBI. Everything is running pretty well now. Ran a 12.8 @ 108 last week at Cecil county. My goal was sub 13 and 300 rwhp so I think I'm there now. I don't think there is much room to do more without switching from TBI or maybe adding a supercharger. Its fun running even with the new Mustangs, Camaros, and Challengers. They get pretty surprised.

DynoDave43

iTrader: (11)

Excellent! Sounds like a pretty sweet combo.

Orr89RocZ

iTrader: (20)

92CamaroDE

It is a fun car. Pretty happy with it. I have been thinking about going to a BBC tbi bored to 54mm. My SBC is 50mm. Not sure I would pick up anything though. My map isn's dropping much between 5k and 6k so I don't think I have much of a restriction now. I am having a tough time getting my a/f ratio over 5500 leaner than 11.5. Ive pulled VE out and hasnt seemed to make much of a difference. I'm 12.3 to 12.5 until I go over 5500 then it drops up to 6000.