I think it will peak at 5500 pending final head flow. I did some simulations and the powerband did move up a little with higher head flow. I'm guessing around 5500 though. That was his target I think anyhow.

-- Joe

 

That's where I wanted it. I hope you're right. Even 6000 is OK. Higher than that is a waste.

 

Yeah, he is running an auto. You auto guys have it easy

The "glitch" I'm refering to is if he sets his cylinder volume constant too high, to keep his upper VE under 100%, the stupid BPW calc will set a roof to his max PW without the patch to fix it. Your right though, with the auto he can leave 100% ve cells up top and just use PE fuel. Unless he likes to hold it at 5,000 RPM and 50% throttle he should be fine.

Do you use PE spark? I zero out all that and just use the main spark table. I kinda like the way vac advance HEI setups work, and I have that duplicated as much as possible in my main advance table of all the builds I do. I also have my PE fuel enable set at 93kpa + 30% tps, as I'm supercharged I want that AFR to change sooner.

I meant to PM you yesterday. Did you fix the idle stuff? I reviewed my notes, and it was the voltage pw correction not AC pw that I was editing. (im getting old, forget things need notebook). When the fans would kick on, it was adding too much to the pulsewidth to compensate causing a hunting idle. I also zero'd out ALL the spark related idle correction/error tables. I think the car idles better this way, at 25 steps + 900rpm.

-- Joe

 

Higher than that and you enter scary land. I've not had great success spinning hydraulic rollers much past 6200. Maybe it was because of forced induction and the air was taking off the spring pressure? (haha, yeah right!) I think it's just the nature of the design and ramp slopes. AFR sells a nice rev kit to help, I'd rather shift at 5800.

I've always had valve float problems shifting past 6200 (with appropriate cams). Sometimes it would be fine when the light came on, other times it would be like putting on the brakes. Broke a few springs.

You have an auto though.. hrmm.

-- Joe

 

Like you said, with hydraulic rollers I feel safe to about 6200. With a 500 RPM margin of error....

On the flip side, I am going to race on the random and occasional basis, 98% of my driving is street, so I don't see why I need 7000 RMP performance.....

I don't give a rats *** about flow numbers, dyno numbers, etc...... I just want a fun car to drive, and I suspect I would have accomplished that.

 

Yea that's true, but hopefully some basic math will give correct cyl. volume.
in the old set-up, not allowing for it to enter PE I was able to tune up to about 4400 rpm @about 80 kpa. This was real good and showed good improvement when entering PE. by keeping blm and afr's consistant.
No, same here zero'd them same w/upper extended ve., but then again I never did a boosted car so I really have no idea (aside from increasing all fueling tables) what is truely needed.
Actually my idle is real good, no hunting or any of that mess, it's just the big IAC counts I don't like, they are going down ,....118 I'll look at what I have in the spark corrections tables, I think I still have those stock, but I don't connect that to the IAC. Timing is pretty solid no knocks and I get 1 on start -up. Open loop a bit rich for the first 30 sec. Same old same old, I just need more time with it, I'll figure it out, I might just throw another IAC on and see if it is the one on the car (doubt it though).
Speaking of which, I am giving T.C a try today ...maybe no more crashes, that's a PIA in itself as of late.

 

Actually I think a good hyd. roller is can handle quite a bit past that, that doesn't mean 7k though, and from every stop light.

 

Safety zone.....

 

You don't. there is a million different ways to build a combo. I like the short duration cam with lots of boost myself. I've build a few other combos (for myself) and I keep coming back to this 224/230 ish combo with boost. No need to shift at 7000rpm.

-- Joe

 

I think it's more of a limitation with valve springs. I'd run a stupid heavy spring to handle the revs, but it would collapse the lifter. I've been on the phone with comp cams for hours, sent them back sets of lifters, etc. I gave up on it

I think part of it could be the boost, I dunno. I just gave up on huge duration hydraulic roller cams. I'm running around 125# springs now, about 38# open and things are just fine for a 6,000 RPM cam. Other guys shift at 6800 without problems.. I dunno. I couldn't reproduce this problem on my 306 cammed N/A 355, but on my 236/236 blown 355 It happened.

-- Joe

 

I know recently comp has had some roller issues, and it appears many have had issues w/them. Yea springs are also a big issue. Being prudent I will leave these on about a year or so and swap out for freash. Currently mine are cranes w/seat press. of 145 and open @410 in. keeping it lower certainly helps.
Al this stuff can break, but I also don't want to jinx it and say to much about luck.

 

i've hit 6800 a few times on my 383 no problems at all. stock tach is off so i thought 6500 was 6500 where i want to shift but its more like 6800

dyno showed increasing power to 6300 then flattend out by 6400-6500, so the cam/intake setup is done by then. I got very stiff springs and a fairly light valvetrain, plus my lobes arent super aggressive like some cams i've seen.

 

The Accel system I'm using is the 7.0. It was installed after a 383 was built and couldn't get a chip burned right for it. Any speed shop can give you info on it, it's easy to install and starts right up. The tune was done on a dyno by the dyno operators (above my head) and two years later, when a supercharger was installed, the system still runs the engine with only a different MAP sensor. The system is speed density. I kept the stock computer to run the dash and transmission. Good luck, Joe

 

It's Saturday. Where is this beast?

 

I don't have a dog in this hunt, (only a torque converter),
but I have learned that 99% of engine builders are not timely.

 

Better late and correct, than rushed and wrong.

 

Next Sat...not this one. Besides, raining cats and dogs right now.

 

Stalker

 

Nothing has been rushed or wrong. It's just that I don't have flow numbers for the heads, BFD.

The selection of the heads took time, consideration, phone calls, and discussion. The specific number at this point is only relevant in terms of internet discussion. I saw the heads, they were worked as they were supposed to be, they are 215 castings, I don't have a number...not a big issue to me.

It's kinda like the cam numbers that aesthes was looking for. We discussed what I wanted, how the cam should act, RPM ranges, etc.... anesthes asked for the sheet, I didn't have it, it didn't matter. I got it, posted it, and anesthes says it's a good cam.

I'm not rushing the important stuff, like specs on each part, I am just not getting into the minutia of the details at this point. I mean, we could be discussing torque values of the heads and it would have just as much relevence.

I know what you're saying, there's never time to do it right, but always time to do it over.

 

those charges were never proven.