Before I start tuning with my new HP Tuners, I have my dyno numbers from Doug Rippie Motorsports. Doug tuned my PCM with LS1 edit and this was done on a Dynpjet dynomometer. I feel like I got ripped because he wouldn't push the timing any harder. We weren't seeing any KR and I've posted his timing table here... (tuners please see attached zip file). So anyways, my mods are 100% stock other than the fact I have a 2001 Z06 cam and springs along with a silverado SS catback that I had installed. The truck has 3.73 gears and has a 5 speed. My peak numbers are: 230 HP from 5000-5400 RPMs HP is completely flat and the Peak torque numbers are 240 ft lbs from 3800-5000 RPM's with a 5 ft lb deveation at most. The weather that day when we dyno'd was 72.9 deg and baro pressure was 28.74. I thought some other guys were pulling better numbers off their "stock" motors than this and here I am pulling numbers like this with a Z06 cam and dyno tune from DRM (which I'm not crazy about).


Please advise,


Joe

seems a little low, here is my dyno graph from my last motor dyno for reference (GM Hotcam, 219/228 .525 .525 112):

http://home.stx.rr.com/jas/motordyno.jpg

seems a little low, here is my dyno graph from my last motor dyno for reference (GM Hotcam, 219/228 .525 .525 112):

http://home.stx.rr.com/jas/motordyno.jpg

What kind of truck? RCSB? 2wd? Trans? Gears? Tire height? Anything else done to your 4.8 other than cam swap?? Am I doing quite a bit better than stock do you think? Anyone have good stock dyno tune where everything is 100% stock other than tune??

Thanks,

Joe

What kind of truck? RCSB? 2wd? Trans? Gears? Tire height? Anything else done to your 4.8 other than cam swap?? Am I doing quite a bit better than stock do you think? Anyone have good stock dyno tune where everything is 100% stock other than tune??

Thanks,

Joe

RCSB, 2wd, 4l60e w/tci 3000 stall, 4.10s, 285/60/17 (~30"). Other than the cam, just longtubes, full true dual exhaust, and a tune.

hirdlej,

yeah that definitely sounds weak. any reason the tuner wasn't getting aggressive on tuning? perhaps detonation concerns?

hirdlej,

yeah that definitely sounds weak. any reason the tuner wasn't getting aggressive on tuning? perhaps detonation concerns?


He said "LS1 motors don't like more than 29 deg of timing max, anything more and it's not worth trying to squeeze the extra HP out of it" I was like WTF dude?! I've built a few motors in my day and the last time I checked is we just kept adding more timing until we saw some pre-ignition and then backed off. This just totally baffled me on how he tuned this thing. And this is supposed to be the world renowned Doug Rippie?? :eyes: Mr. Corvette himself? :eyes: :eyes: The guy is a jerk and made me feel like I was wasting his time. What would you guys start looking at in my tune if this thing is putting out numbers this low? Do you think it's a timing issue? Something else? The AFR is dialed in anywhere from 12.9-13.1 under WOT. That being said, I think I'll leave the VE tables alone, however I think I should just keep adding timing and logging until I see KR to get the most aggressive table possible. Does this make sense? Also, I'm running the stock steel 16" wheels with heavy Michelin LTX M/S tires on it. Would that make a 10RWHP difference or not?

Thanks,

Joe

my 01's stock numbers were 220/230 i beleive...

dont worry about it... lets just hope you didnt pay good ole Rippie that much cash for what he did. I would just keep building this sucker and one day you'll come across someone that you really enjoy talking to and actually have fun tuning with. And ya.. 29 max is bs... your exactly right, lol keep going up untill you pre-ignite... sounds good to me :)

I won't be able to try my "modified" Doug Rippie tune 'til this spring since my truck is in storage :cry: I am just going to keep increasing timing more and more until I either hear spark knock or the PCM detects it. His tune is BS. ABout the only thing he dialed in right was the AFR. He couldn't even figure out how to remove my rev limiter! The first thing I saw when getting my HPT is that the electronic throttle control MAX was set to only 5600 RPM's........ Argh, sloppy worksmanship upsets me! I think I'm going to go into business for myself when I get this tuning thing down. Do street tunes locally for all '03 and '04 silverado's for $200 a crack...... Anything has to be better than this rippie tune!

Im not a fan of Doug Rippies tunes but he does have a point that most near stock LS1s(even yours with the very mild 01 Z06 cam) dont see too much of a power gain running more than 30 degrees of timing. There is no point in running 32 or 36 degrees of timing if it makes as much power as 29 or 30 degrees. Plus it gives you that extra buffer incase you get some bad gas.

He said "LS1 motors don't like more than 29 deg of timing max, anything more and it's not worth trying to squeeze the extra HP out of it" I was like WTF dude?! I've built a few motors in my day and the last time I checked is we just kept adding more timing until we saw some pre-ignition and then backed off. This just totally baffled me on how he tuned this thing.


Joe

WTF indeed. Sounds like one of those "LS1's need a certain amount of backpressure to run properly" kind of guys.

I was wondering if you checked and changed your pushrods? When I put my ZO6 cam in I didn't. The hp and tq #'s in my sig are with the wrong push rods in (stock push rods 5.3) Opps!.. But after I changed the push rods the motor wants to make more power now, says my tuner. I would have dyno numbers to prove it, but when the truck was on the dyno the methenal would not spray. I have another appointment on the 4TH. I know you said you built a few motors before, But I didn't check mine untill now. I'd thought I would just ask!

I was wondering if you checked and changed your pushrods? When I put my ZO6 cam in I didn't. The hp and tq #'s in my sig are with the wrong push rods in (stock push rods 5.3) Opps!.. But after I changed the push rods the motor wants to make more power now, says my tuner. I would have dyno numbers to prove it, but when the truck was on the dyno the methenal would not spray. I have another appointment on the 4TH. I know you said you built a few motors before, But I didn't check mine untill now. I'd thought I would just ask!


Good point indeed, however the '01 Z06 cam uses a large base circle due to it's shorter lift and shorter duration. I checked the rod length after installing and the valvetrain had good geometry. The rocker tip had a nice even sweep across the tip of the valve stem. After starting and running the rockers/springs are quiet as can be. I am happy with how quiet and smooth everything operates. Good idea though on the rods, most guys don't even think to check them when they slap a new cam in a motor.

Yeah I put down 255/260 on my 99 w/'02 Z06 cam, exhaust, and CAI. Those are my only mods, and that was with my mail order Nelson tune :) Then again mine is a 5.3 and 4wd, not sure how much of a diff that would be though.

Chris

Yeah, I used the 02 zo6 cam as well. The reason I thought about it was the motor was loud. And didn't sound right reving at 6k, on the dyno. Now that the push rods are changed, the motor is quieter.

well what about the SOTP feel after the swap and tune and stuff, does it feel stouter or not a big difference at all???

well what about the SOTP feel after the swap and tune and stuff, does it feel stouter or not a big difference at all???


It feels just like it ran with the stock cam, other than the fact when you rev it up to 4500 or around there it keeps pulling and pulling. Very steady smooth power above 4000 RPMS, perfect for passing. I think any bigger cam would have been a bad choice for my style of driving. My gas mileage didn't go up or down either. Right at 22MPG on the highway at 60MPH. We have poopy gas here in MN as well. Any bigger of a cam and I wouldn't have been happy. I think the key to having a good street motor is to have the broadest, smoothest torque curve possible. Any bigger and it would have developed a lope, then comes a decrease in gas mileage, hotter temps at idle, vibrations, etc etc. If I want to go any faster I'll put in a 408 :drive: . Otherwise I'm trying to be practical with this thing and get decent mileage and good driving mannerisms. Just wanted a slight warmover on top of what the factory power was like :) If I want to drive a big lopey fast truck I'll drive this:

My '70 C10 SWB with a 500 HP 468 big block and 4 spd muncie. Brakes aren't an issue since they're full manual drum ;) LoL


Joe

You didn't mention it, but you did change springs when you did the cam? Just trying to rule out the obvious stuff.

Here's my 4.8/A4 dyno. Mods are listed on the sheet. Truck had 3.42 gears at the time, and this was with the 20's on it.

http://www.mufakkaracing.com/stuff/scream/48_212dyno.jpg

What are the odds you got a stock f body cam and not a ZO6 cam?

What are the odds you got a stock f body cam and not a ZO6 cam?


You know...... I didn't want to say it but that thought has crossed my mind more than once..... I never mic'd the cam before installing (which I should have done). I'm wondering if doug rippie sold me a stock LS1 cam vs the '01 Z06 cam he said this was. He sold me the cam and solid blue springs for $50. The more I think about this the more it upsets me....

Look at Scream's Dyno, with 3.42 gears, Auto trans and big heavy 20" wheels, he's putting down a peak of 272 HP and 261 ft lbs of torque compared to my 230 HP and 240 ft lbs of torque. Scream, this is very impressive for that motor. I'm thinking of yanking a valve cover off and putting my dial indicator on a pushrod to see how much lift is in that sucker. If it's not a .525 lift, I'm going to be very very upset!!! If this thing has only a .479 lift on the intake and .472 on the exhaust, Imma take this camshaft and go feed it back to Doug. He screwed me once with the Dynotune, I wouldn't be surprised if he screwed me with this cam as well. Like I said, this cam feels just like my stock one until 4500 RPM's or so then the torque just extends beyond the stock curve. Not really more intense, but just more prolonged........ If I have to yank this cam out again and we'll say I wanted to upgrade to a COMP 212/218 .558/.563, will these "BLUE" LS-6 springs be sufficient? Are these even LS6 springs for cryin' out loud????

These are the valve springs I have installed in my truck right now. Are these comparable to a Comp 918 spring? What's the max lift these are suggested for? Changing springs was a bitch and I don't really feel like doing it again. http://www.tatommy.com/images/driverssprings.JPG

You said you have an 01 z06 cam? That is different than a 02+zo6 cam that has a smaller base circle (not larger) the 01 z06 cam has the same base as any Ls1

the 02 cam is 550/550 the 01 is 525/525. thos springs are for 01 zo6 (blue about 2 bucks at the dealer good for that cam) The yellow ones are about 9.00 a peice and are good for well over .550. I would go with a bigger cam lift and a little more duration your gas mileage will not suffer that much. With all my mods I still get 18-19 on the e-way at 65-70 mph. my cam is 207/230 w lift over .600 w/ the 1.85 rockers. still idles stock. check out Lingenfelters LS1 cams I think They have one you would be very happy with springs and all for under 400.00

yellow springs have came way down,around $70 a set