First Mods?

[Zfatuated]

I've done the driving schools and the Z/28 needs no mods to perform (and I want nothing to risk voiding that OE track warranty), so my only additions will be clear film protection on the front and hips and some dash jewelery (delivering Monday):

[frayed]

Originally Posted by Zfatuated

I've done the driving schools and the Z/28 needs no mods to perform (and I want nothing to risk voiding that OE track warranty), so my only additions will be clear film protection on the front and hips and some dash jewelery (delivering Monday):

Completely agree with this. Other than good suspension settings, I'm not sure what else you need to go fast on the track, reliably. It's coming from the factory already optimized.

OTOH, I do think there will be one power area that could be exploited. I recall in one of the tech vids that after the collector there's a neck down in tubing 'for emissions purposes'. Don't remember exactly. A replacement section non compromised for the feds would be interesting.

I'd still pass on that for now, and keep my warranty in tact and buy a second set of wheels for hooters and keep the standard wheels for a set of PSS's.

Anyone know if the stock recaros have a seat bottom cutout for pass through of the crotch belt of the 5pt harness setup?

[McRat]

The LS7 had to be strangled to make emissions.

This is 3 curves, bone stock, minor bolt-ons, then adding a cam.

Note the huge torque increases.

Also note that the "bolt-on" rwhp is akin to the stock ZL-1 HP, with similar "area under the curve".

Just bolt-ons will give you a power-to-weight significantly higher than a ZL-1.

[brt3]

Originally Posted by Zfatuated

I've done the driving schools and the Z/28 needs no mods to perform (and I want nothing to risk voiding that OE track warranty), so my only additions will be clear film protection on the front and hips and some dash jewelery (delivering Monday):

Agreed. Biggest performance mod is to improve the wheelman...

Love your jewelry collection; that's gonna look hardcore in your Z/28!

[Zfatuated]

Originally Posted by McRat

The LS7 had to be strangled to make emissions.

This is 3 curves, bone stock, minor bolt-ons, then adding a cam.

Note the huge torque increases.

Also note that the "bolt-on" rwhp is akin to the stock ZL-1 HP, with similar "area under the curve".

Just bolt-ons will give you a power-to-weight significantly higher than a ZL-1.

I appreciate where are are going with your post. However. We don't know, for a fact, that any of this above is true, or not, at this point in time- in regards specifically to the Z/28.

I want to see a dyno chart of a stock Z/28 to compare before I entertain any "big cam" dreams. Maybe a cam unlocks a broad, linear powerband boost in the Z/28. And maybe it won't. No one knows that as fact at this moment.

What is different in the Z/28 ECU mapping? The effect of the CAI? The tri-y headers? What else? Does it already have a different cam? You think the team breathed on everything but the engine? Someone, in another post that escapes me at this moment, did the maths on the quarter mile time a Z/28 ran in a mag test. Guess what?

Before I get in a mad rush to void my warranty, I want to know the facts.

[McRat]

I would NOT swap cams, or anything else that I couldn't return to stock in a couple hours.

I would play with "free mods", cheap mods, and tuning.

As soon as I break it in, I will do baselines. Then play with "free mods", then bolt-ons and tuning.

This is normally how I start, and I report the results in detail. With free/cheap mods, the 2000 SS went from 312rwhp to 342rwhp, and 13.10? to 12.52 ET. The Vette went from 356rwhp to 390rwhp and 12.40 ET to 11.62 ET. (Note, the 405HP LS6 had a serious issue with IAT retard, tuning made a huge difference). Wifey's CTS-V has been left bone stock. Won't let me breathe on it.

[LehmanZ06]

I wonder how aggressive the alignment is going to be---although I realize putting an alignment t on this car is going to be much easier with a lot more shops and dealers able to do it and it won't cost Porsche $$$$---and be as much a pain as my GT3.

Porsche dealer .......sir here is the bill for the alignment---now please bend over.

[McRat]

There are two sets of alignment specs, street and track. So if you're going to track the car, you need to set yourself up to do alignment in your garage or in the pits.

[McRat]

Z/28_Speed Chart															
															
	Axle 	Tire Dia							RPM						
	3.91	26.3	1000	1500	2000	2500	3000	3500	4000	4500	5000	5500	6000	6500	7000
Gear	G1	2.66	7.5	11.3	15.0	18.8	22.6	26.3	30.1	33.9	37.6	41.4	45.1	48.9	52.7
	G2	1.78	11.2	16.9	22.5	28.1	33.7	39.3	45.0	50.6	56.2	61.8	67.5	73.1	78.7
	G3	1.30	15.4	23.1	30.8	38.5	46.2	53.9	61.6	69.3	77.0	84.7	92.4	100.1	107.8
	G4	1.00	20.0	30.0	40.0	50.0	60.0	70.0	80.0	90.0	100.1	110.1	120.1	130.1	140.1
	G5	0.74	27.0	40.6	54.1	67.6	81.1	94.6	108.2	121.7	135.2	148.7	162.2	175.8	189.3
	G6	0.50	40.0	60.0	80.0	100.1	120.1	140.1	160.1	180.1	200.1	220.1	240.1	260.1	280.2
		Ratio							MPH

[350 HRSS]

Originally Posted by razorz28

Any thoughts on best courses or tracks to look at for training. I don't mind flying in for the training.

I highly recommened the Ron Fellows school at Spring Mountain We did our ZR1 training there, and loved it! Top notch service and excellent instructors!

[Zfatuated]

Originally Posted by 350 HRSS

I highly recommened the Ron Fellows school at Spring Mountain We did our ZR1 training there, and loved it! Top notch service and excellent instructors!

Ron Fellows is excellent and I would recommend that to anyone.

Also as I've noted before- Porsche Sport Driving School at Barber Raceway in Leeds (Birmingham), Alabama is superb. This is Porsche's US "home track", and where the Z/28 spanked the Porsche GT3 at the press event in Feb. Gotta love it, I do

[Octaneman]

Although each to his own, my Z-28 will be modified. Since I plan on driving mostly on the street, I would like to generate some extra ponies.

I do plan to track the car, or at least one of our guys from the shop will. The problem is the closest track is 200 miles away, and time commitment can be difficult for us.

We are going to obviously baseline the car.

Next we are going to install a new set of LS7 cylinder heads that are CNC'd ( we deal with LPE), including upgraded Inconel Exhaust valves, we will also install the GT-19 Camshaft with upgraded Ferrea valve springs.

We will not change the air intake or exhaust for the first round.

Then we will test a Fast intake with stock throttle body, then a Nick Williams 102.

After that, we will install a set of American Racing Long tube headers with off road pipes, to see if they gain any power of the GM exhaust.

I have all the parts here, and my Car is on the way, so hopefully we will have some data by end of May, Early June, and will post dyno sheets.

The CNC head/cam combo has been repeated by us several dozen times on the LS7 in the Z06 vettes, so the combo is proven not only for substantial power gains, but longevity.

our Current Z06 has over 100,000- KMS - over 60,000 miles and has seen literally hundreds of hours at high performance driving events,- we did rebuild the motor and did some more upgrades this year. But the motor ran flawlessly to that point.

[McRat]

IMO -

I'm thinking you're putting hay in the wrong end of the horse.

It's the mandated sound and emissions that GM could not get around. So intake and exhaust mods should give the biggest gains.

Also, if you're a hotrod shop, the most $/day can be had selling CAI/Exhaust/Tuning, since it can be inventoried and sold mail-order.

[2SSRS@Gen5diy]

Originally Posted by Octaneman

Although each to his own, my Z-28 will be modified. Since I plan on driving mostly on the street, I would like to generate some extra ponies.

I do plan to track the car, or at least one of our guys from the shop will. The problem is the closest track is 200 miles away, and time commitment can be difficult for us.

We are going to obviously baseline the car.

Next we are going to install a new set of LS7 cylinder heads that are CNC'd ( we deal with LPE), including upgraded Inconel Exhaust valves, we will also install the GT-19 Camshaft with upgraded Ferrea valve springs.

We will not change the air intake or exhaust for the first round.

Then we will test a Fast intake with stock throttle body, then a Nick Williams 102.

After that, we will install a set of American Racing Long tube headers with off road pipes, to see if they gain any power of the GM exhaust.

I have all the parts here, and my Car is on the way, so hopefully we will have some data by end of May, Early June, and will post dyno sheets.

The CNC head/cam combo has been repeated by us several dozen times on the LS7 in the Z06 vettes, so the combo is proven not only for substantial power gains, but longevity.

our Current Z06 has over 100,000- KMS - over 60,000 miles and has seen literally hundreds of hours at high performance driving events,- we did rebuild the motor and did some more upgrades this year. But the motor ran flawlessly to that point.

I like where your going with this, but IMO think you need the headers at the same time, it will give you the most out of the car, some members say its all the car they need IMO it will take them one year to see the car needs more power in the straightaways, at that time they will be asking for help, can you send me info on the Heads, we are taking the car for headers too as soon as it delivered.

Originally Posted by McRat

IMO -

I'm thinking you're putting hay in the wrong end of the horse.

It's the mandated sound and emissions that GM could not get around. So intake and exhaust mods should give the biggest gains.

Also, if you're a hotrod shop, the most $/day can be had selling CAI/Exhaust/Tuning, since it can be inventoried and sold mail-order.

on this your right, but lets hope members think more into it and do all the work, not only some of it.