Well, the G2 install went well. Will start tinkering in the morning. Truck fired up first try. Big relief.
Well, the G2 install went well. Will start tinkering in the morning. Truck fired up first try. Big relief.
Last edited by Trentec; 09-28-2013 at 05:42 AM.
Ok, humbling experience it was! Had some success and some failure. Went too rich moved a stumble around and had to punt...lol Back at it in a couple of weeks when he gets the truck legal to drive and we can collect some useable data. It was fun though!
As if I needed this to get any more complicated... my buddy calls and wants to change the cam and intake uggg so I picked a cam and would very much appreciate any feedback and or experience with this one please. Any suggestions for an intake?
COMP Cams 249-11-302-4
LSA = 112
Exhaust Valve Lift (in.) 0.503
Intake Valve Lift (in.) 0.503
RPM Range 1000-7000
Int. Duration @ .050 in. (Deg) 212
Exh. Duration @ .050 in. (Deg)218
Int. Duration Advertised (Deg) 260
Exh. Duration Advertised (Deg)268
Engine Make/Size:Chevy Big Block (396-454)
Lifter Type:Hydraulic Flat Tappet
Usage:Street/Performance
I don't know exactly what cam is in my Dad's 454, but I can tell you (and Mark can as well lol) that with a "computer friendly" (lie) cam, Edelbrock intake, and headers, it was about 20% lean. Took a fair bit of work adjusting the fuel pressure to get fueling back in line, and with as much work as I had to do to try and get fuel pressure up, any more fuel needed and it would have required a change of the fuel pumps.
On the potentially helpful side, I learned that if you have the OE 454 fuel pressure regulator that has the "window" where you can see the spring (some you can't), you can shim the spring until it's a hair less than at coil bind, and you will get as much pressure from the pump as it will deliver.
Last edited by dyeager535; 10-01-2013 at 07:38 PM.
"Frankentruck" is a "1985" K5, TPI 350 '165/6E (Vortec Heads, SDPC2000 base, roller cam, headers), 32 Spline SM465, 205 w/VSS, 10b/14SF, 3.42's and 33" tires. Soon to be boxed frame, '87 sheetmetal, and TPI w/ '727
The thought I have is that this engine is 52 cubic inches smaller (402) so maybe the fuel would be in the adjustable range. The last tune I had in it was bad rich pulled hard but left a cloud...lol What you said makes sense that part combo should have netted at least a 20% power increase or more. The intake needs to be changed due to an obstruction on the stock intake the EGR stuff I think but it's wide and flat and will collect puddles of fuel. So his thinking is that he wanted a cam and if he has to pull the intake off he's not doing it twice and I can't argue that point. That was the smallest cam at least in the group I looked at. my question is really about how friendly that particular cam is to the computer. Because power is nice but drivability ultimately is going to be more important.
Last edited by Trentec; 10-01-2013 at 08:29 PM.
That should not be a hard cam to tune. I tuned more cam on a tighter lsa in a 305 running a 7747. Should idle all day at 650 rpm.
I think the rpm range of that cam is a lie or typo however I just don't see it making much power over 5,000-5,500 rpm. Definately not enough duration for 7K.
5000 is all it will ever see and hardly even that, didn't think it would do much more with the 650 or so cfm. It's a lot more cam than stock so it should give him a little more pop. I just wasn't sure how the system would handle it.
Thanx for the input!
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