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| Project 3400 Roller Cam Block (Page 44/82) |
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La fiera
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JUL 12, 08:58 AM
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| quote | Originally posted by lou_dias:
I scanned it to PDF. Perhaps tomorrow I'll screen copy the pdf pages as images and upload them.
This dyno shop is definitely not all there. Says I made about 167 ft*lbs of torque. That's about what a 2.8 makes. I think he somehow managed to scale down my power via certain parameters he put in.
Even the most basic of 3.4 swaps makes about 200 ft*lbs. This dyno is basically saying I am making 20% less torque than the most basic of 3.4 swaps. This dyno run was bogus. Perhaps he was trying to let me pay him to "tune it"...
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That happened to me once when I had my 2.5 SOHC Dodge Spirit Turbo. Had 379whp and 402wtorque, and after a turbo swap and a sheet metal intake and more boost I was doing 366whp and 390wtorque at a different dyno! I took it back to the first dyno and it put down @ 4200rpm; 420whp and 526wtorque.
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lou_dias
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JUL 12, 10:48 AM
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1st run 4th gear, he didn't even plug in the O2 sniffer:
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lou_dias
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JUL 12, 10:55 AM
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3rd gear after I asked him to show RPM and add the tail pipe sniffer - duh!
My brother says I should be at 14:1 at low rpm and richen up to 12.5:1 on the top end. I will do some re-tuning and hit a more reputable shop up for a dyno...
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carbon
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JUL 12, 11:02 AM
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| quote | Originally posted by La fiera:
That happened to me once when I had my 2.5 SOHC Dodge Spirit Turbo. Had 379whp and 402wtorque, and after a turbo swap and a sheet metal intake and more boost I was doing 366whp and 390wtorque at a different dyno! I took it back to the first dyno and it put down @ 4200rpm; 420whp and 526wtorque. |
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Yeah, you can't compare two different dyno setups even if they are the same brand. It would be nice if there was a standard. Even "SAE corrected" results are all over the place...
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lou_dias
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JUL 12, 12:44 PM
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Making some assumptions here about ratios but basically if 168 ft*lbs on this dyno = 249 ft*lbs at the original shop and the hp/torque ratio is correct, then I should put down about 221 rwhp at the original shop right now...which is completely in line with the best I've seen from a 3400 AL heads on a stock cam...and completely in line with my actual track performance. What a shocker...
Also, looking at the 3rd gear pull, my "peak" hp is directly at the stock cam's peak hp of 5200 rpm - again, another shocker right? So I guess I'm no longer limited by the Fiero intake neck at 4100 rpm ... who would have thunk it?
...time for a cam upgrade I guess...[This message has been edited by lou_dias (edited 07-12-2013).]
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carbon
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JUL 12, 02:04 PM
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| quote | Originally posted by lou_dias:
Making some assumptions here about ratios but basically if 168 ft*lbs on this dyno = 249 ft*lbs at the original shop and the hp/torque ratio is correct, then I should put down about 221 rwhp at the original shop right now...which is completely in line with AL heads...and completely in line with my actual track performance. What a shocker...
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Le sigh... this again? All that work and you're in line with stock Gen III heads. I would hope for better for the time and money spent...
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Also, looking at the 3rd gear pull, my "peak" hp is directly at the stock cam's peak hp of 5200 rpm - again, another shocker right? So I guess I'm no longer limited by the Fiero intake neck at 4100 rpm ... who would have thunk it?
...time for a cam upgrade I guess...
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Spec out your own Comp Cams roller cam for $340...
WOT-Tech Comp Cams Custom Cam
Heh... for $880 you can do a billet race cam. 
WOT-Tech Billet Race Roller Cam[This message has been edited by carbon (edited 07-12-2013).]
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lou_dias
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JUL 12, 06:52 PM
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Excuse me? what work? I threw some money at a machinist. I did no work. You wanna see "work", look at the guy (masospaghetti) doing a full 3500 swap. NOW THAT'S WORK!
Besides, wasn't it the ALUMINUM head camp who claimed superiority, where as all I've ever claimed is equality given the dynamics of displacement? (IE you don't have enough cubes to benefit from ported GEN3 heads...) Sorry, but it's me who is still laughing inside. Remember, I'm still not ideally tuned...though I doubt my peak will improve - I have a lot of bottom end power to recover...
This looks like the cam for me: http://wot-tech.com/shop/gm...mshaft/prod_242.html
...but that won't be in the cards until next year...still debating a turbo for next year since picking up a mere 30-45 hp is not going to be enough to overcome the top 2 cars consistently.
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Will
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JUL 14, 05:31 PM
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Any discussion of how your engine performs is silly if it's not tuned correctly.
Quit bench racing, sort your problems out and get it running right.
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masospaghetti
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JUL 14, 10:21 PM
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Not saying my approach is better than yours. You could throw money at a shop to swap a full LX9 also, just saying.
Hopefully the next person who decides for the LX9 will have it a lot easier. Most of the difficulty was due to lack of documentation.
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La fiera
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JUL 14, 10:28 PM
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| quote | Originally posted by lou_dias:
Excuse me? what work? I threw some money at a machinist. I did no work. |
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Don't get mad Lou, Carbon has a point there. Eleven pages on your built and now you are down in power, It has happened to all of us at one time.
Just sit down and re-think your set up and follow Will's advice about bench racing.
Criticism can make you better, it is just how you take it. Best wishes on your next race!
Rei Moloon
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