Trying to figure out what cam I intend to go with. My motor is a LB9 305 TPI, Mac Headers, Full Hooker exhaust, Ported Plenum, worked over SLP runners. I will be getting the trickflow heads in a couple weeks and want to change out the cam at the same time. I just intend to use it for a daily driver. The 3 cams that im debating are as follows:

LUN-60100LK:
Duration at 050 inch Lift: 207 int./213 exh.
Advertised Duration: 250 int./256 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.437 int./0.454 exh. lift
Lobe Separation (degrees): 112

LUN-60101LK:
Duration at 050 inch Lift: 213 int./219 exh.
Advertised Duration: 256 int./262 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.454 int./0.468 exh. lift
Lobe Separation (degrees): 112

LUN-60102LK:
Duration at 050 inch Lift: 219 int./227 exh.
Advertised Duration: 262 int./268 exh.
Valve Lift with Factory Rocker Arm Ratio: 0.468 int./0.489 exh. lift
Lobe Separation (degrees): 112

I was looking at the LUN-60103LK but it says its not computer controlled compatible and the rpm range is from 1800 - 6200. From what i've read that the TPI will only be good up until 5500. So I am also wondering if the LUN-60102LK might be too much as its rated from 1,400 - 5,700.

Any input would be greatly appreciated.

Thanks

 

Daily driver, on nice heads, TPI, on a 86 computered 305, I'd go with 60101 with 1.6 roller rockers. You'll need some 22-24 lb injectors, and a chip to match.

 

I realize that ill never take advantage of the modifications until I get into burning chips, (something I know nothing about). Being on a limited budget my questions are....

Will this combo run on the 19lb injectors & stock chip? Until I can afford 22's or 24's.

Once I do get the 22s or 24s will those run on the stock chip? Until I can get fimiliar with tuning.

 

It appears those are the Voodoo series from Lunati? haven't heard much about them other than that you have to break them in carefully because the ramps are so aggressive. Anyway I would pick the 60101 as well, but I would not run 1.6 rockers unless the heads will flow enough to support that much lift. By the way which trick flows are you using? I am probably ignorant but I am not familiar with any trick flow heads that have 58cc chambers for a 305.

You will also be just fine with the stock injectors and the stock chip since your car is a MAF car. Injectors and a custom tune would probably not hurt, but I had my car dyno'd and they said it was running real good and a tune would not gain me much of anything. By the way you can not install larger injectors and run the stock chip. You should be making around the same power that I am and my car runs great, 100mph trap speed in the 1/4 with 28mpg on the highway, not bad for a 305. Good luck with yours.

 

I think Trickflow did come out with a smaller head for 305s last year or so. I'm not in the states anymore, so I don't keep up on my reading of new parts, but I'm sure they were available. Not sure how they compare to the Edelbrock heads.

Don't take my word for injectors being absolutely necessary, as I've never done that with a 305. If you can borrow a wideband air fuel meter, do it, and see if you're getting lean at the high RPMs at full throttle.

 

when they had my car on the chassis dyno they had sniffers in the tailpipes. my fuel pressure was at 48-50psi and it was about half a point rich at WOT with stock chip and 19# injectors. However it was running at about 235 degrees, which may explain the slight richness (and poor power output, 235hp/280tq, I also had an automatic trans at the time that later puked). Running down around 190 where it is usually at, it may lean out some. I have driven this engine almost 30,000 miles in it's current tune.

 

Well if I decide to go with the 101 cam then I will get Summit Part #TFS-30300001
Specs: 56cc 175cc intake runner 1.94 x 1.50 valves good for .480 lift

The only difference for the others are the springs to handle more lift.

and yes they are the lunati voodoo series cams. With 1.6 roller rockers is that going to put me over .480? Maybe I should consider getting some better springs?

 

I am in the same boat. 305 bored .30 over and balanced. heads ported and 1.94 and 1.60 valves. Headers ect. I installed a cam from tpis and have been dissapointed, You have to be carefull not to loose your bottom end. I found out the hard way. I installed a 2000 stall and it helped, Had my chip done PCMforless. That helped a ton, I have retard the cam to crank timing and it got worse, so I then advanced it on the crank and it helps some, blowed trans up, Did you try this lun-60101lk cam and what was the out come?

 

well im still aquiring parts for the install... Im hoping to get everything together before i rip it down. I just need to get some rocker arms and gaskets and I should be good to go. i'll let you know how it turns out.

 

I still had the stock heads for my car. I went with the xe258hr cam from Comp cams.
It is 206/212
.480 int and .487exh
110 LSA

Worked great for me, check the sig.

I would've benefitted alot more from my cam if I was able to put on the L98 aluminum heads, but unfortunatly, I blew a piston

 

I have been told that on a 305 you cannot go over .500 lift. on a computer controled tpi car without reprogramming. I am running stock 350 injectors and vader said it will handle 400hp. So dont waste any money on injectors. I did port my plemun and gasket matched the runners. I am waiting for a transmission from Maddog racing. If you purchase new rockers I would put roller rocker in this will help in friction and on top end response. The cam I used from TPIS was a 700-500. I am not impressed at all with it. Please let me know how it turns out. I am going to replace my cam later. I dont want to waste my time and money again. Thanks: 49m

 

Not true!

I have .480 int lift with 1.6 roller rockers that makes that 0.512
I have .487 exh lift with 1.6 roller rockers that makes 0.519.

Probably that was flowing more than the heads but then I had nitrous to compensate that

 

Well I got the trickflow heads with the upgraded springs 1.47" OD single coil good till .540 lift 1.78 installed height @ 120lbs. On the cam card it says to use the recomended installed height of 1.750 @ 100lbs. So my only concern now is wiping out a lobe on break in with the increased seat pressure. Im waiting on some GM EOS additive that I ordered along with the trickflow 1.6 roller rockers. So i'll just keep my fingers crossed when i fire it up for the first time.

 

Let me know how it runs. What brand of 1.6 roller rockers are you going to use. I am going to put some in mine while it down for a while.

 

The 305 comes back to life!!

The rockers are trickflow 1.6'ers

I've noticed a biggg difference from the stock cam, it definitly pulls all the way up to 5,000rpm now. So far im very pleased with this voodoo stick. Doesnt pull too hard outta the hole until you get to about 1,200rpm then it throws me back in the seat. I think i may just need to play with the timing some. I just installed it straight up and currently have the timing at 8* advanced.

I got the cam broke in without too many problems. I've just begun to get into the tuning phase now. At idle the blm's will sit at 128, however under load i have seen them go up to about 136 and under de-acceleration i've seen them as high as 158. So it looks like its going lean, i've got the stock 19lb'ers with 50psi set at the fuel pressure regulator. So im wondering if RednGold was right about needing bigger injectors.

 

BLMs at decel don't matter. That's low load / low fuel flow, and actually should be fuel cutoff.

Your idle BLMs are EXACTLY at 128??? Can you see if it's really in closed loop then? There's a few qualifiers to get closed loop and block learn, so check to see that they're all met.

Wide Open Throttle at high RPMs is what determines whether you really NEEEED bigger injectors. If you can get to a dyno, with a wideband, or borrow a wideband, you can determine it in a few seconds. Check (and calibrate while you have access to the equipment) to get about 12.5:1 for a safe A/F (and safe EGT).

The PE enrichment on the factory tune was quite rich, and since you're using MAF, it's probably not a big problem, even when the MAF gets maxxed out (which you might be doing now, but it's not gauranteed to be maxxed out). Look at the MAF g/sec in a datalog, and see if it gets to 255, or even ~242 (which might be the "max airflow vs RPM" limit clamping the flow before it goes higher). Also, if you're worried now, you can look at the factory O2 sensor voltage during full throttle and high RPM, and make sure the voltage is at least ~750 mV all the way up, more than that is fine for now. That'll at least tell you that you're richer than 14.7:1.

Most important BLMs are at about 30-40% throttle, in the 3500 RPM range (that you can reach reasonably, like highway in 3rd gear, hold that throttle position for as long as possible). With MAF and stock injectors and chip, it should be somewhat close to 128. If not, you can try more fuel pressure before you get into the chip/injectors. Just make sure youre pump is up to snuff.

You're using the '86 165ecu with $32B and cold start injector? right? Maybe still $32. Might consider burning a $6E and disconnecting the cold start injector, when you get deeper into it. Then, all you change is MAF flow tables and scalars, not all the PWs in a big table.

Also, with different/better heads, start tinkering with spark to get closer to the knock limit at higher loads. And play with it on the dyno as well (can just bump base timing manually, or if you have an emulator you're set). As long as you keep your knock sensor and detection active, you'll probably not hurt your engine.

That's enough rambling from me...
Good Luck!