Stock bottom LS1, TFS 515 kit, low numbers
09-17-2009, 08:38 PM
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Stock bottom LS1, TFS 515 kit, low numbers Hey guys, hoping for some assistance here. I'm a little confused.
Took a completely stock 00 camaro engine(unsure of mileage, def looked over 100K). We put in ARP rod bolts, the TrickFlow 515hp kit(heads, cam, rockers, pushrods, headgaskets, everything), Fast 92mm IM, Nick Williams throttle body, and it already had the other supporting mods. (this is in an RX7 chassis).
Dynojet results were about 370whp and 340ish tq. Pretty damn weak. Did a leakdown test tonite with no pushrods or rockers in, so I did not focus on putting it to TDC, in fact they were all at BDC(could tell because when rotating engine either way you could feel it compressing.)
All the cylinders were around 6-8%, with one cylinder being at 20%. Possible for that one cylinder to really be killing the tq by 80ish ft lbs?
Thanks in advance...
Took a completely stock 00 camaro engine(unsure of mileage, def looked over 100K). We put in ARP rod bolts, the TrickFlow 515hp kit(heads, cam, rockers, pushrods, headgaskets, everything), Fast 92mm IM, Nick Williams throttle body, and it already had the other supporting mods. (this is in an RX7 chassis).
Dynojet results were about 370whp and 340ish tq. Pretty damn weak. Did a leakdown test tonite with no pushrods or rockers in, so I did not focus on putting it to TDC, in fact they were all at BDC(could tell because when rotating engine either way you could feel it compressing.)
All the cylinders were around 6-8%, with one cylinder being at 20%. Possible for that one cylinder to really be killing the tq by 80ish ft lbs?
Thanks in advance...
09-18-2009, 07:53 AM
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CARTEK Racing
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something is terribly wrong...
I would say that looks alike a bolt on car number, but bolt on cars have more torque...
Is the cam in correctly?
20% on one cylinder will not cause you to loose that much power.
Somethign else is up.
I would say that looks alike a bolt on car number, but bolt on cars have more torque...
Is the cam in correctly?
20% on one cylinder will not cause you to loose that much power.
Somethign else is up.
09-18-2009, 12:34 PM
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Nope, cylinder #6.
And yes, I agree something is terribly wrong, but I can't find it
I thought the cam could only go in one way? I mean obviously you can get the timing off(however it is dead on..), but I don't think you can do it any other way....
I think my next step is to put the rockers and rods back in and do a compression check just to see what it says.....
And yes, I agree something is terribly wrong, but I can't find it
I thought the cam could only go in one way? I mean obviously you can get the timing off(however it is dead on..), but I don't think you can do it any other way....
I think my next step is to put the rockers and rods back in and do a compression check just to see what it says.....
09-18-2009, 02:00 PM
#7
What cam? What tranny? Also would be interested in seeing a graph.
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09-18-2009, 04:43 PM
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I'll see if I can get Frost to put it up for us. The tq curve is extremely flat...kinda wierd.
The trans is the standard t56 6spd.
Cam specs as per TrickFlow:
Camshaft specs are 228/230 duration, .585 in./.585 in. lift, 112 lobe separation angle.
The trans is the standard t56 6spd.
Cam specs as per TrickFlow:
Camshaft specs are 228/230 duration, .585 in./.585 in. lift, 112 lobe separation angle.
09-19-2009, 12:31 AM
#9
Hey guys,
I don't have the graph on my laptop (just got done digging) but it's on a backup at the shop. It may be some time Monday before I can get a hold of it.
The graph was insanely smooth with smoothing on 0. I have never seen such a naturally smooth curve. It went up and down where you'd expect it to, but the tq was low everywhere. The day of the dyno, I compared against the graph of a bone stock 01 Z06 and though the Z only made 356rwhp, it made MORE torque through a good portion of the curve.
It ran very well. No noise, no smoke, didn't puff out of the filler, didn't pull a bunch of vacuum of top, was not misfiring through the pull (or any time)... Tried timing from as low as 23 deg up to the point of KR. Tried AFR from 12.3-13.1 along the way as well. It ended up making the most with timing around 24 at peak tq and up to 26.5 up top along with an AFR of about 12.8-12.9:1. Along with the wideband data, the NB data looked good, clearly no misfiring.
Here is the graph:
I don't have the graph on my laptop (just got done digging) but it's on a backup at the shop. It may be some time Monday before I can get a hold of it.
The graph was insanely smooth with smoothing on 0. I have never seen such a naturally smooth curve. It went up and down where you'd expect it to, but the tq was low everywhere. The day of the dyno, I compared against the graph of a bone stock 01 Z06 and though the Z only made 356rwhp, it made MORE torque through a good portion of the curve.
It ran very well. No noise, no smoke, didn't puff out of the filler, didn't pull a bunch of vacuum of top, was not misfiring through the pull (or any time)... Tried timing from as low as 23 deg up to the point of KR. Tried AFR from 12.3-13.1 along the way as well. It ended up making the most with timing around 24 at peak tq and up to 26.5 up top along with an AFR of about 12.8-12.9:1. Along with the wideband data, the NB data looked good, clearly no misfiring.
Here is the graph:
Last edited by Frost; 09-23-2009 at 11:49 AM.
09-22-2009, 05:45 PM
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i would check vacuum at idle, if the cam is out of time the vacuum reading will be drastically off, the last one that i fixed like this (which was about 2 weeks ago) was only pulling 4in. of vacuum at idle. cam was a tooth off, also if an adjustable timing set was used, and is adjusted incorrectly, can throw hp numbers off tremendously, we had one here with a 402 that the cam was set at 4* adv. only made like 390 something, pulled it down degreed it in (it was 6 or 7* off) and picked up like 80 rwhp. so even if it was set dot to dot it would be worth being degreed.
09-22-2009, 07:20 PM
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i would check vacuum at idle, if the cam is out of time the vacuum reading will be drastically off, the last one that i fixed like this (which was about 2 weeks ago) was only pulling 4in. of vacuum at idle. cam was a tooth off, also if an adjustable timing set was used, and is adjusted incorrectly, can throw hp numbers off tremendously, we had one here with a 402 that the cam was set at 4* adv. only made like 390 something, pulled it down degreed it in (it was 6 or 7* off) and picked up like 80 rwhp. so even if it was set dot to dot it would be worth being degreed.
I agree, since it looks like all the other bases are covered, cam timing could be the culprit...
The only other thing I can think of would be a slipping clutch but you can look at the dyno graph and see that. The torque curve would be nearly linear.
Shane
