Well I got the car back on the dyno last night for the final tune with meth and restrictor plate. I was impressed to say the least.

02' Z06. Stock heads and short block.
A&A P1sc 3.85 pulley, restrictor plate 9-10psi
Comp 224/228 .581/.588 114
TSP springs, cups, retainers, pushrods
Supermaxx LT's with cats, Borla stinger
Motron 60#'s, KB bap, LPE 255l, ECS meth
Textrailia, new Trans

The new numbers off the meth are 634/544, 6,700rpm, 10psi, 11.9:1afr, 15.5* total.

The new numbers on the meth are 622/550, 6,400rpm, 9psi, 11.3-5afr, 15.5* total.

We figured we should leave well enough alone and not turn the timing up any more. We added a little more fuel and turned the gain **** to 7 on the meth. I am just using the meth as a safety factor not a tuning factor. We actually used it to tone the car down some. The meth comes in at 2lbs and is at full blast at 8lbs. The tq is just unreal in this car now. It hits 500rw at 4,200 and holds it to 6,500. It makes 550rw from 4,700-5,600. It also hit 600rwhp at 6,000 and keeps climbing slightly to 6,400 where we shut it down so we didn't over boost it. It crosses 500rwhp at 4,700. It is like a whole new car.

Last time to the dyno it made 550/500 restricted to 6lbs with 14* total, no meth. I was running a 4.10 pulley at the time. So I swapped to the 3.85 and took 3/16th's out of the plate. I also added 2* of timing. Those were the only power making mods.

I will be making a trip back to the track Friday night. Last time out I ran 11.0's@130. The car was only making 5lbs that day due to belt slip and 12* total timing. So hopefully this time I will be down in the tens at 135. That is the goal.

Brett

 

Damn good numbers man with P1SC buddy

Graph would be appreciated !!!

peace

 

graph please?

 

Thanks. I can never seem to get graphs posted on here. I can scan it and email it to some one if they like.

 

you can email it to me whenn1@verizon.net & I'll get it posted up.

 

Those are insane numbers. Extremely high for a 346. Pump gas I assume? Why a restrictor plate, to keep peak boost down?...why not just pulley it less? The plate restricts at all rpms right?

 

Thanks. I sent you an email a second ago. Let me know if it goes through.

 

Are those numbers SAE? And are they through cats and mufflers? I can't believe how high they are. Congrats. Should make easy work of 10's.

 

Yes they are SAE and they are through cats and mufflers.

 

Is that a new record for a P1/346?

 

I think so buddy

peace

 

No, not even close. There is a guy making 697 or some thing like that. I am sure if I took the restrictor plate out I would have made atleast 13lbs of boost by 6,800. That would be worth 70rwhp (I get about 23rwhp per lb of boost) on my car then we could have tuned for the meth. I don't even have any head work. This car just wants to make power. I think the tq is up there though. It would have probably topped out at 57-580rwtq unrestricted.

 

Damn good numbers man!

 

Unbelievable !!!!!!!! I am amazed at how much power people are making these days. Technology is coming along faster then you can keep up with it. Congratulations the results.

Same question as another member though, why the restrictor plate and not just less pully??? Just wondering what the thought process was here so I can understand. Thanks bro and have fun at the track, 10's for sure bro.

 

Sick #'s with a P1-that suckers gonna rock!

 

sorry for the delay...the origonal poster will explain the second graph upon sight.

 

power went flat Stable thru whole RPM buddy

peace

 

Thanks for getting the graghs up there foff667.

If you look at the second graph it kind of tells the story. With the plate I can run more boost on the bottom to boost tq and level it off on the top. That is what I did. I gained 50rwtq and alot of low end hp. The lines on the second graph are labled. Except for the last top one which was the last dyno. You can see what I gained pullied down at the same boost restricted as I did unrestricted with a larger pulley. I will try to explain more later.

Brett

 

I guess I don't understand why the plate would allow more low rpm boost, but restrict high rpm boost, rather than a sort of linear restriction across the curve. Maybe it's a physics thing or something, I'm not an engineer so I don't know. My bright idea had always been to have a set-up that's pullied down to give lot's of low-end boost, but if it gets to be a little too much on top, then just pull back on the limiter a few humdred rpms...I don't know if that makes sense either (or would work), but was another idea on managing the same challange. Also, on the first graph...a tad lean maybe? Again congrats, amazing numbers. I wonder what my car would put down on your dyno. Dez's reads a little low. Not that it matters as my car runs perfect and breaks 'em loose in 4th so I've got all the power I need. It's just interesting that I have a 402/AFR 225 heads, 232/238 cam, FMIC/custom inlet hat/ory/cutout and your numbers on a 346/cam/P1/cats/muffler are almost the same as mine. Weird. CR has a little to do with it, and maybe the dyno, but still kind of wild that you made what you did.

 

You are correct on your assumption of the restrictor plate limiting boost in a linier fashion past a certian point with the same size pulley. But if you pully down as I did you pick that low end boost back up and then some. So I gained another two lbs through out the curve. Plus I took out 3/16" of the plate to give me another lb or so. That is why there is a boost in the low end. I am also limiting my rpm as you suggested. You can also add fuel and pull timing. That will kill your top end as well.

The first graph is read at the tail pipe through the cats. So it will read a tad lean. Most NA cars that come off that dyno are in the 13.5:1 range. And they don't blow up. The three runs before that were all in the mid to low 11's afr. But we back to backed it a couple of times and I think the charger was getting warm as was the fuel and leaning out the mix alittle. After that pass we added more fuel and meth any way. But we did not make another pass. So I can not give you any exact numbers on the ratio.

As far as the numbers being inflated. It has been pretty much proven that this dyno is a hair low. The cars always mph faster at the track than the dyno shows. Some examples. My friend 408 put down 490rwhp on that dyno but has ran tens at 131.5 at the track. My car put down 340rwhp and ran 116.34. Then 365rwhp and ran 118. Then 405rwhp and ran 123.5. There are plenty of other guys doing the same thing.

As far as your combo. I am sure you are maxing out that P1. I bet if you put a D1 in there you would see a world of differenct. What boost are you running? And when does it come in or lay down? Plus your cam could be slightly large. What is the LSA and what is the over-lap? You could just be bleeding off power. But I am willing to bet your power under the curve runs mine into the ground. Plus if you look at ECS and others they are making 750rwhp with forged 346 combos almost the same as mine. Where as their 400+" motors aren't doing much better for peak numbers just one hell of a tq curve. I know Slowhawk is an outstanding builder and tuner. I am sure he has much more insight than I do. Thanks for you comments and replies.

Brett