Well af\ter talking to Compcams techs and getting two totally
diff.custom grind cam recomendations then being told they may not have a roller core until jan/1/03 or later I called summit tech
and they recomended magnum 230/230 560/560 single patern cam w/110 lobe sep. Does anybody feel I will have any tuning issues with that much duration? or the 110 lobe?
And do you feel its a good choice over my ZZ9 212/226 483/520
112 sep.?
Im using 7730 SD.

 

That cam should give you some NICE power. 230 cams are not that big of a deal when it comes to tuning. I have one (230/245). The 110 lobe shouldn't be too bad either. My only concerns would be the following ...

1) No vacuum. Trust me - I know. Brakes - what brakes.
2) Single Pattern? If your cylinder head exhaust port doesn't flow that much then you will want a dual pattern cam. What's your I/E ratio?

Tim

 

Thanks Tim,
Well the first cam they advised to me was a 224/236. then the second tech guy said he never would have made that big of a split and he said 230/236,I thought that sounded better also
but I see now that yours also has a big split. HMMMM
Do I wait till janauary or later for the custom grind or do the summit single?

Here are some flow #'s FROM Canfields site:
VALVE LIFT .100 .200 .300 .400 .500 .600 .700
Intake Port 72.0 145.0 201.0 247.0 258.0 259.0 259.0
Exhaust Port 53.0 107.0 143.0 175.0 190.0 200.0 203.0

I currently have the heads off now and plan to have them pocket ported and hope to beat these #'s.
Thanks for help.

 

The 730 ecm should be able to tune your set just fine, and even with my 222 226 cam my brakes are only about 50% of stock.

 

I chose a big split pattern because I plan to eventually use this cam with a Vortech Supercharger. You don't want a big split. Either the 230/230 or the 230/236 will be fine.

Tim

 

Would this cam be to big or hard to tune:

112 centerline

IN / EX
225 / 231 Dur at .050
0.554 / 0.560
Rocker Ratio 1.6

 

Not at all, but you have to remember that the computer works on the basis of trying to toggle around the stioch ratio of 14.7 to 1. My cam (222 226 .500 lift) won't hit stioch below 1100 rpm, a cam like that might not hit stioch below 1300 rpm. I'm running the 747, so all I did was change the rich and lean window values to a lower O2 voltage (about 150mv lower @ low air flow). This fixed the "mega rich" idle conditions. This is because unburnt air is gonna be pushed through the cylinder at low rpms, no matter what, so by telling the ecm to toggle at a leaner O2 reading (lower voltage) you can acutally get a pretty good mixture being burnt. So just be aware that the ecm is going to respond to a big cam by dumping too much fuel in at low rpms.

 

see if they can grind the 230 dur 560 lift cam with a 114 lobe seperation. thatll kep the brake working and help with vacum issue.

 

Thanks for all the help fellas,I'm gonna try the single pattern.
Not worried to much about the brakes,I have no problem w/manual brakes if need be.

 

You could always get a vacuum pump for the brakes.

 

Hey Guys ,
Wanted to let you know that I put car back together this weekend and Dropped Lower VE table by 15% and dropped fuel pressure some and have Idle @ 128 625 RPM so I guess I wont have any problems hitting stoich but ill know for sure soon as I Find an 02 for my WB (NAPA says they are on factory back order)
Also I took car for about a 20 mile drive and no problems at all with brakes,thanks for the help.
230/230 560/560 X 110 lsa

 

128 does not mean stoich at all, (it jsut means that the desired O2 voltage has been met) at idle I was at 128 but running pig rich originally, and with a wide band - they only work when the engine isn't purging unburnt air out the exhaust at idle (like your cam is probably doing up to 1300 rpm).

How does the car run now?

 

Hmmm,I was scared you were going to say that.
Thats what I was scared of.
Well right now it idles fine seems to smell a little rich but deffinetly not to bad,has good response and drives pretty ok.
mind you I have done minimal work to the VE table right now
since the weather has been bad here (snow/rain/salt)
but with the quick guess work I have done thus far its not bad at all.
So I guess the only way to tell how it is at idle is to check plugs ,Right?

 

if you know an emisions mechanic swing it into his shop and shove a 4or5 gas up the tail pipe. just make sure the cat isnt in there.

 

Plugs checks could work,

The method that seemed to work for me was to set the idle toggle O2 voltage lower and lower until it started to run worse (I think it was somewhere aournd 300mv) ,and the stock setting was around 550 mv (once the idle bias voltage is added). So since I could smell unburnt gas with the stock setting, and the low setting I used caused engine to run poor and weak. I simply picked a number in the middle... like 425mv (includes idle bias).

Its a rather crude way of doing things but it worked well, good milage at low rpms, and nore more gas smell at all.

Again I'm speaking of the 747 code, but the 730 must have O2 voltage tables.

 

I can't seem to find o2 table in tunercat for 730 or winbin.

 

Yeah I have GMPCM (the most complete editor I've found) and I couldn't really find anything about O2 voltages, but there must be something....maybe under a strange name.

 

Here are the idle values (for maskid $8D):
The non-idle tables follow closely behind.

RBob.

 

Thanks for Info C1500 and Rob I will go play a little now.

 

Hey guys,
I mailed T/C about no 02 toggle voltages and here is what ive got.

"Hi Tom,

Attached is a zipped file containing an updated $8D Definition File, along with the current FormLib file. I've added the fast and slow O2 rich/lean idle parameters to the constants table for you to experiment with. Try it out and let me know how you make out with it.

To install the updates, unzip these files into you Tuner subdirectory, over-writing the old files."


Tuner cat is great!

 

Ya .. I've got them to change a couple def files now, he's pretty good about it. You know that they have software on there site that lets you edit the def files. Its actually pretty easy.

 

I know I want to start but am a little intimidated right now,but then again i was about prom burning before i started that.
Thats actually the reason I mailed TC because when Rob gave the address I had no clue what to do with it.