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Head Cam Swap results
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SMOKEmUP
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Joined: 30 May 2002
Posts: 3169

65093.54 points


1979 Chevrolet Camaro

PostPosted: Fri Sep 29, 2006 11:33 pm    Post subject: Head Cam Swap results Reply with quote

I just got back from the dragstrip with the car. Paul_P met me up there and he was able to take some videos.

I got 3 runs in. The best was the last run with 12.327 @ 110.57, 60' 1.807. I didn't datalog run #2 (I forgot to start logging) All the timeslips are in the garage section. I compared this to my previous best of 12.644 @ 107.08 with a DA of -779 ft.
Code:
 
E.T.   12.327 (sec)
Trap Speed   110.57 (mph)
Measured DA   370 (feet)
Corrected to -779(feet) DA
Corrected ET   12.179 (sec)
Corrected Trap Speed    111.947 (mph)

The car gained 0.465 seconds and 4.867 mph as a result of the bump in compression, Ported LS6 heads, MTI B1 cam, UD pulley, and 160T stat. The car badly needs an exhaust. I feel the exhaust will really wake the car up.

The car felt off tonight. While previously tuning the car I was hitting higher MAF values indicating more air in the engine. I need to compare this run to the G-tech run.

Quickly looking at Run #3 the torque converter slip RPM varies from 400 - 700 rpm. Also the car wouldn't stay in lockup most of the ride home. I think the trans is short for this world.

For run three I bumped the timing table up another 2 degrees and I'm getting some knock retard from 4700 rpm on up in second and third gear. I need to run some race gas and see what the car likes for timing.

The Air Fuel Ratio was slightly on the rich side, varied between 12.2 - 12.7:1 for the entire run.

***Edit ****
One more thing is I filled the gas tank before heading to the track, drove 75 miles up, raced, 75 miles back, filled up again and averaged 17 MPG's (not too bad). Considering a bunch of stop and go on the ride up, racing, and averaging 75 - 80 mph on the highway back.
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87calais
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Joined: 19 Apr 2003
Posts: 206

5692.14 points



PostPosted: Sun Oct 01, 2006 4:29 pm    Post subject: Reply with quote

That's Some sweet ass times there smoke!!
_________________
88 SS Monte Carlo, nowhere near stock
'04 Silverado =)
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SMOKEmUP
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Joined: 30 May 2002
Posts: 3169

65093.54 points


1979 Chevrolet Camaro

PostPosted: Sun Oct 01, 2006 4:51 pm    Post subject: Reply with quote

87calais wrote:
That's Some sweet ass times there smoke!!

Thanks. I'm a bit disappointed. I was hoping for 11's.
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96capriceMGR
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Joined: 23 Aug 2003
Posts: 814
Location: New London Wisconsin
20327.88 points


1996 Chevrolet Caprice

PostPosted: Sun Oct 01, 2006 8:04 pm    Post subject: Reply with quote

How big is that cam and how high did you bump compression???


Definetely fast for a street car but hate to say it I think you are right to be disappointed, hope you find a lot more in further tuning.
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Mon Oct 02, 2006 7:55 am    Post subject: Reply with quote

Compression went from 10.25:1 factory to 10.868:1 with a DCR of 8.45:1.

Camshaft - 221/221 @ 0.05 0.551/0.551 w/ 114 lsa.

The car is running the stock exhaust which I think is really killing it. Time for headers, high flow cats, and a cat back. I'll bet the gain from the exhaust will be close to 50 HP to the wheels. For now that will have to wait because mod money is non-existent.
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96capriceMGR
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Joined: 23 Aug 2003
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Location: New London Wisconsin
20327.88 points


1996 Chevrolet Caprice

PostPosted: Mon Oct 02, 2006 6:43 pm    Post subject: Reply with quote

No headers???? Shocked yeah you will gain a lot and I bet it gets done over the winter.
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Tue Oct 03, 2006 9:47 am    Post subject: Reply with quote

96capriceMGR wrote:
No headers???? Shocked yeah you will gain a lot and I bet it gets done over the winter.

I know... no headers Sad . The factory manifolds aren't all that bad but that in combination with the factory Y-pipe and muffler really kill it. Out of curiousity I want to measure the exhaust back pressure. I'm thinking of taking out the O2 after the cat and putting in a pressure sensor. Ideally the sensor will have an analog output which I can route to the datalogger to see how much pressure the system really has. Since the cam is a single pattern it's not very friendly to run with a corked exhaust.

Right now the injector duty cycle peaks at 97%. I think an injector and fuel pump upgrade is required when I do the exhaust.
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clay
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1972 Chevrolet Nova

PostPosted: Tue Oct 03, 2006 7:01 pm    Post subject: Reply with quote

Yeah...., I used an analog sensor when I logged my exhaust back pressure.....A big (about 6" dia.) low pressure gauge I got from work duct taped to the windshield Laughing . Wasn't pretty, but it worked. I'm curious about yours, can't wait for the results. Clay
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96capriceMGR
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1996 Chevrolet Caprice

PostPosted: Tue Oct 03, 2006 8:15 pm    Post subject: Reply with quote

The wide LSA should "help" it not lose so much power due to the restrictive exhaust.
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Tue Oct 03, 2006 10:29 pm    Post subject: Reply with quote

clay wrote:
Yeah...., I used an analog sensor when I logged my exhaust back pressure.....A big (about 6" dia.) low pressure gauge I got from work duct taped to the windshield Laughing . Wasn't pretty, but it worked. I'm curious about yours, can't wait for the results. Clay

I was thinking of trying to hook up a map sensor. Not sure if the exhaust gasses will be too hot after the cat.
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86GN
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1990 Chevrolet Corvette

PostPosted: Tue Oct 03, 2006 11:23 pm    Post subject: Reply with quote

Run a several foot coil of a metal capillary type tube to isolate the heat from reaching the sensor. Turbo guys are doing this to measure pre turbo exhaust pressure with EGT's of 1600+
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SMOKEmUP
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Joined: 30 May 2002
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1979 Chevrolet Camaro

PostPosted: Wed Oct 04, 2006 12:06 am    Post subject: Reply with quote

86GN wrote:
Run a several foot coil of a metal capillary type tube to isolate the heat from reaching the sensor. Turbo guys are doing this to measure pre turbo exhaust pressure with EGT's of 1600+

Good idea. I have a GM 2bar map I can use. You happen to know where I can find the transfer function for the map? Numbers on it are 8867104 or 466 or aa1-2.
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clay
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Joined: 24 Nov 2002
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Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Wed Oct 04, 2006 4:28 am    Post subject: Reply with quote

I pretty much figured that was what you were going to use. Temperature isn't as much as a problem as you would think. I screwed about a 8" nipple into the 1/8" NPT bung I had welded on and put a rubber hose on it and had no problems at all for a 20 - 30 minute run. It's going to basically a dead headed system so there isn't any exhaust gas actually flowing to heat anything up a lot. Clay
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Wed Oct 04, 2006 10:03 am    Post subject: Reply with quote

Does anybody know of a pipe adapter for the O2 fitting?
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clay
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Joined: 24 Nov 2002
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318129.23 points


1972 Chevrolet Nova

PostPosted: Wed Oct 04, 2006 5:05 pm    Post subject: Reply with quote

If I remember right, the big style sparkplug shared that same thread. You could probably cut the lock ring off of the plug and knock it apart then either tap it whatever pipe size will work or weld on a pipe nipple or coupling. That's all I can think of, I don't know why they would even make such an adaptor, but I've been wrong many times before. Clay
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