new (used) Z28 ran 13.9 @ 99 the other night

I bought a '95 Z28 a few weeks ago. Black, 6speed, t-tops, leather, 130k miles. Anyway got to the tack and ran a best of 13.9 @ 99 out of 4 runs.
The mods done are
3.73 gears,
CAI
flowmaster muffler
is that okay time and trap speed?

Second question.
Can I hit high 12s with a 100 or 125 dry nitrous shot? or would it take more?

Here are a few pictures
www.pbase.com/demon440/junkhosting click on "junkhosting" and scroll all the way down for pictures



Thanks

About the right times for the mods. Trap does seem kinda low for that gearing though. What was your 60' time?

lol well actually I missed 4th gear on that run. I dont know how and I have never done it befor. ( had a '87 GT ) On another run I traped 100 with a 14.1.

on the 13.9 run I got a 2.0 sixty foot.
also this all on 245/50/16 street tires.

Times sound about right, 60' seems pretty decent considering the street tires and M6.

That's not bad for a ten year old 130,000 mile LT1 on street radials that could probably use a small tune up at the least...Realistically, all you have is a CAI & 3.73 gears...So driven properly, it should trap 100 to maybe 102 in good weather if running properly...Trust me when I say you aren't gaining anything with that Flowmaster muffler...Look at a full cat-back system or a cutout to open up a little power through your exhaust...

Mike

Hell My car runs 13.4@106 and my only mods are a cutout, K&n filter in the stock box, Full MSD(6al box, coil wires) LT4 KM, TB bypass. And my car has stock gears, with 156k miles. And a tip to not miss 4th( I did it for a bit) I now grap on the driver side of the stick, b/c before I would tend to pull the stick towards me instead of straight down. So now I wrap my hand on the other side of the shifter. Just my .02

I would be happy with that time. Best I could manage was a 14.1@100.5 with a blistering 2.35 60'. Mine has Flowmaster catback, K/N cai, lt4km, and TBB and is a M6. Guess I need to learn to drive the dang thing. How are you M6 guys launching? Seems like I either spin or bog. Can't seem to find a happy medium.

cool! I love this car. To the person who asked how to get a 2.0 sixty with a 6speed and street tires. I launched at about 2400rpms and just slowly let the clutch up while slowly giving it more gas. The first 2 runs i bogged real bad and the third I spun but the 4th was real good with the 2.0.

What kind of gains could i expect with a cutout and not missing 4th?

thanks

also what is the "LT4 KM" and what does it do?

Hell My car runs 13.4@106 and my only mods are a cutout, K&n filter in the stock box, Full MSD(6al box, coil wires) LT4 KM, TB bypass. And my car has stock gears, with 156k miles. And a tip to not miss 4th( I did it for a bit) I now grap on the driver side of the stick, b/c before I would tend to pull the stick towards me instead of straight down. So now I wrap my hand on the other side of the shifter. Just my .02

wow thats pretty dang fast for what you have done. Think the MSD did anything for performance? And this was on street tires. I am guess they were b/c of your sig.

Thanks for the tip, i'll try that next time.

The LT4 KM or LT4 hot Cam is a real common cam swap, you can buy the whole Lt4 conversion from summit, i think its around $500 and you get cam r-rockers springs, retainers etc. The whole swap is good for bout 30-40HP

ah thanks.


Just ordered a summit cutout :)

The LT4 KM is a knock module, it is less sensitive than our stock LT1 modules. People with headers or roller rockers tend to get false knock with the added noise those parts add, and our sensitive LT1 KM will retard your timing because of that.

ohhh will my cutout cause that too?

How are you running a 13.4 with those few mods?

Sounds good, my friends 1994 Z28 A4 3.23 ran a 13.9 @ 99mph, he had 3/4 tank of gas and a bookbag full of books and clothes in the trunk. I was driving and I'm about 175lbs or so. I think he had 80 or 90,000 miles on it at the time.

The only mod he had was a Flowpro muffler, his inlet elbow was torn+ductaped and his transmission puked a few weeks after that day at the track ;)

Since then he's removed the cat (it was clogged), replaced the fuel pump, added a cutout and electric water pump

http://robvas.dyndns.org/rob/vids/stanton4-13/doughty13s.wmv

that time isn't at all bad for the mileage but i feel at sea level you should be capable of 13.60s but i am sure with more driving you will achieve a faster 1/4,my car at 2760' slp shorties,cai(homemade)and 18''goodyear f1's i ran 13.9 @99 60' was 2.11.

13.6s? maybe. I would be very happy with a 13.69 with my summitracing cutout that just got here today. I'll find out next friday and report back with a new thread. I am also going to take out the jack and spare tire. Also run on less gass, like maybe 1/4 tank rather than 3/4 like last time.

My first run ever with my car when it was stock was a 13.76 @102.8 with a 2.4 60' time... so it is most defenetly possible for some good times out of a stock car... although rare...

stock LT1's don't do 13.7 @ 103 with a 2.4 60'

sorry. not happening.

With just a CAI and my cat-back, i busted a 13.85 @ 101.8 mph. Just to give u a refrence. My car is an auto too.

I have the timeslip right here....

And I was off on 1 number... it was a 2.17 60' not 2.4.

Actaully have a video of part of it from someone on a local MB.

Only mod was a K&N airfilter, and Nitto DRs...

wow thats good time and mph. What is your car factory hp rating? Is it higher than the regular Z28s and T/As?

WS6 cars were 305hp in 96/97 Vs the std 285hp. Mainly due to the factory Ram Air; or more simply a much better intake design.

oh dang. Well yeah 13.7 stock is defiantly believable.

oh dang. Well yeah 13.7 stock is defiantly believable.
maybe with drag radials and a dead hook launch

a stock LT1's short fall is its top end. if it can get a dead hook then yes 13.7 is believable, but it won't be at much more than ~101mph.

Hey whatever you want to believe, I have the slip sitting at home in my office, video of it on my laptop, and about a dozen witnesses...

stock LT1's don't do 13.7 @ 103 with a 2.4 60'

sorry. not happening.
That's smoking fast for an LT1 but I believe it. I've seen a stock 6 speed 96 Z28 run 13.7 @ 103 :eek:

That's smoking fast for an LT1 but I believe it. I've seen a stock 6 speed 96 Z28 run 13.7 @ 103 :eek:
does "stock" include drag radials?

i would believe with a sub 2.0 short time then a 13.7 would be possible, but we all know how fun it is to get that on 245 50 street tires.

This one was a 6 speed, but I've seen stock automatics cut a 1.9x (even a TPI car) on non-drag radials

Not all LT1s came with mesly 245 tires.... some are the 275's stock...

Not to mention there is a difference between a "normal" T/A or Z/28 and a WS6 car...

sooo whats faster a '98Z or a '97SS ?

LT1's are just like LS1's they all put out about the same power, SS/WS6 or otherwise.

And a 1998 Z28 is faster than a 1997 SS.

LT1's are just like LS1's they all put out about the same power, SS/WS6 or otherwise.

Not true...

The SS & WS6 cars in LTx form were rated with an additional 20hp, at 305 Vs the normal V8 cars rated at 285hp. The WS6 intake was/is far superior than the SS setup for many reasons, thus the boost in HP was more prevelent in the LTx WS6 Firebirds.

For LSx cars, it's similar, base was 325, with the SS/WS6 being 345 I believe. But the SS scoop is a mockup, and non-functional. I believe all the LSx cars all use the same intake setup.

I thought that the 98-99? LS1 f-body were rated at 305hp and the '00 WS6 at 335. I have not looked at the numbers in along time.

No, Stop reading magazines. LT1's 96-97 = Same HP +/- 5HP

The only things that added any real HP on 96-97 SS/WS6 was the SLP exhaust option on the SS. Unless it's a LT4 SS.

No, Stop reading magazines. LT1's 96-97 = Same HP +/- 5HP

The only things that added any real HP on 96-97 SS/WS6 was the SLP exhaust option on the SS. Unless it's a LT4 SS.

Uhm, dude...

put down the crack pipe and look at my user name... U think I don't know about my own car????? :rolleyes:

I think you need to go do some real research and find the right info, you are the one that seems to be reading from magazines...

And the SLP exhaust was only an option, and rarely added option for that matter on any LTx SS. The SS RA setup was/is a piss poor design that did not add any HP to the car what so ever (Due to technical reason's I won't get into here, but has been discussed 100's of times on this MB). The WS6 LTx cars were another beast; with only a straight shot 6" long intake track, this is where they got their 305 hp rating Vs the stock 285 hp.

Well obviously you don't know your car or any other LT1 for that matter. Read my post do you see that word " option " right before SLP exhaust?

You are damn stupid if you really belive that the Ram Air on you car adds 20HP. Not to mention it isn't really functional either. The only benifit to either the SS or WS6 ram air is the fact that there are less restrictions in the air intake.

Now do you want to keep arguing? Dyno your car and maybe you will realize I am right. Your little Ram Air that you thinks adds 20HP adds no more than a SLP CAI.

I have to throw mine in:

My '95 M6 car ran 14.01 @ 101 with only an SLP CAI and on nearly bald street tires. I haven't had my '97 SS at a dragstrip yet. Anybody want to guess what my SS should run with 4.10's, Ram Air, decent tread on 275/40ZR17 Kuhmo Ecstas, and a LoudMouth Catback?

But what I really wanted to say is that just reading through this thread it makes me happy I made every painful payment (it's paid for now) on my LT1 car. (Now have a '97 SS.) You just can't get a better bang for the buck.

This post is about a guy that ran 13.9 with a 130,000 mile used car almost a decade old??? Awesome!

I will leave it at this... You have been a member here for a little over a month.. I've been here for over 5 years; been working on cars for over 15 years; I've rebuilt 4 cars from frame off, built 2 from scratch; I also hold dual BS degrees in ME and EE...

I know just about every bolt on my car, inside and outside. I also know thermodynamics and fluid mechanics better than most people on this MB...

But as I reasoned in another thread, I really should live by the words in my sig... so I bid adu... and you can continue to believe what you wish to believe...

Well obviously you don't know your car or any other LT1 for that matter. Read my post do you see that word " option " right before SLP exhaust?

You are damn stupid if you really belive that the Ram Air on you car adds 20HP. Not to mention it isn't really functional either. The only benifit to either the SS or WS6 ram air is the fact that there are less restrictions in the air intake.

Now do you want to keep arguing? Dyno your car and maybe you will realize I am right. Your little Ram Air that you thinks adds 20HP adds no more than a SLP CAI.

For LSx cars, it's similar, base was 325, with the SS/WS6 being 345 I believe. But the SS scoop is a mockup, and non-functional. I believe all the LSx cars all use the same intake setup.


thalt shalt not BS people about specs. go look up your numbers and come back and correct your post.

also ...

*goes outside and looks at my LS1 SS*

... how exactly is this scoop a mockup?

I have been here for alot longer than a month I just switched to a more internet friendly screen name.

You are wrong I am right. What does anything you listed have to do with pure common sense? The more you try to explain the dumber you sound.

All LT1's from the factory are just like LS1's. No matter what model the F-Body is they are all the same output. The 96-97 SS/WS6 might have 5HP more and the 98-02 SS/Firehawk may have a little more with the SLP/BW lid.

Ram Air isn't going to add HP unless you are moving. It's is less restrictive YES, but it's not 20 hp worth. 96 & 97 SS are rated at 305HP. Standard Z was 295HP.

Direct copy from one of the main 4th gen FAQs...

http://www.f-body.org/faq/4/4_1.htm#ch4_1a

"SS - available as an upgrade to the Z28 model starting in late-1995 (as a 1996 model). The package include a functional ram air hood scoop and reworked exhaust manifolds resulting in 305 HP and 335 ft-lbs of torque. An optional freer flowing exhaust system brings HP to 315 and torque to 342 ft-lbs. In 1998 with the introduction of the LS1 engine, power was boosted to 320HP, and with the optional SLP exhaust power was boosted to 327HP. The stock wheels and tires are replaced with 5-spoke 17" ZR-1 style wheels with 275/40ZR/17 tires. Hurst shifter and Torsen differential were available options. Bilstein shocks, stiffer rate springs/bushings, and a larger front sway bar make up the optional Level-II suspension. The stock spoiler is replaced with sleeker looking one. "SS" badges replace the "Z28" badges on the front fenders and rear passenger bumper. All cars were shipped as stock Z28s to Street Legal Performance (SLP) Engineering where the above modifications were made through 1997. After that, GM made the modifications on its own assembly line."

"WS6 Option - Ram Air Performance Package (Formula Coupe/Trans Am Coupe) Includes Ram Air induction system, specific tuned suspension, high polished 17-inch aluminum wheels, P275/40ZR17 speed-rated tires, dual oval high polished exhaust outlets. WS6 was the option code was available on both the Formula and the Trans AM.. This option boosted power to 305 HP and 330 ft-lbs torque on the 96 and 97 models. In 1998 the WS6 boosted power to 320HP and 345 ft-lbs torque."

I also don't know LS1s, this why I stated that "I believe"... Mainly in reference to LS1 intake tracks and the SS intake; I thought the LS1 SS hoods were appearance only and were non functional; someone correct me if I am wrong.

I never stated dyno numbers, nor anything else; I was quoting SPECIFICATIONS...

And if you can explain to be how a intake track that is straight and only 6" long is the same or equal to one that is 3 feet long and has a min. of 2 90* bends into it, I may believe you. (Speaking in terms of heat soak and piping losses if you could...)

Hell, if you are so set on being right, so be it... At least I can and do admit when I don't know something..

***NOTE TO MODERATORS:

I think this has gotten a little out of hand, and way off-topic...

Myself included as someone whom has been here a while should know better than to argue... (One of those weeks...)

I also don't know LS1s, this why I stated that "I believe"... Mainly in reference to LS1 intake tracks and the SS intake; I thought the LS1 SS hoods were appearance only and were non functional; someone correct me if I am wrong.
you are wrong.



i'm quite surprised how many details the f-body FAQ leaves out.

Ok seriously here lol, here's a nice little break down for you all, I've only been here a lil while yes, but that doesn't mean I don't know these cars.

in 93-95 the cambirds were rated at 275 horse 325 ft lbs. The 93 cars were speed density and have been rumored to actually dyno more rwhp on average than the 94/95 cars. 95's are the best cars to have in theory due to the fact they have both OBDI's which are easier to tune and vented opti.

96-97 cars standard were 285 horse 325 ft lbs due to an extra cat added. The ram air cars were rated at 305 hp 335 ft lbs.

98-00 LS1's were rated at 305 horse 330 ft lbs, Ram air cars were 320 horse 345 ft lbs

01-02 LS1's had the addition of LS6 intake and boosted power to 325 hp 350 ft lbs for the ram air cars and 310 335 for standard, although the 02 firehawk was rated at 345 horse 345 ft lbes


there :D

why does it matter anyway about what the hp ratings are????? We all know the LS1 especially was underrated. I've seen a 97 WS6 dyno 243 hp 276 ft lbs and a 95 formula dyno 268 hp and 307 ft lbs. Yet the factory rating was the 97 made 305 hp and 335 ft lbs while the 95 was rated at 275 hp 325 ft lbs, and yes I know that is supposed to be motor not rear wheel rating but that doesn't matter obviously because the more power the motor makes, the more you see at the rear tires. Its all just advertisement. Its all about the car in question. I have a buddy with a 02 firehawk that dynoed 321 hp and 333 ft lbs BONE STOCK. then had a buddy with a 00 SS dyno 294 hp 301 ft lbs. Rating means nothing other than a round about figure as to what the car produces on average and what it was meant to produce. In other terms, to advertise the car's potential. Ram air DOES NOT produce 20 hp, it may up the rating by 20, but the car isnt making that much power just from ram air, that barely is more effective if at all, than a good aftermarket CAI.

I was just trying to get the point accross to this fella.

Uhm, duh.... get the point across to me?

yea, ok... whatever dude...

why does it matter anyway about what the hp ratings are????? We all know the LS1 especially was underrated. I've seen a 97 WS6 dyno 243 hp 276 ft lbs and a 95 formula dyno 268 hp and 307 ft lbs. Yet the factory rating was the 97 made 305 hp and 335 ft lbs while the 95 was rated at 275 hp 325 ft lbs, and yes I know that is supposed to be motor not rear wheel rating but that doesn't matter obviously because the more power the motor makes, the more you see at the rear tires. Its all just advertisement. Its all about the car in question. I have a buddy with a 02 firehawk that dynoed 321 hp and 333 ft lbs BONE STOCK. then had a buddy with a 00 SS dyno 294 hp 301 ft lbs. Rating means nothing other than a round about figure as to what the car produces on average and what it was meant to produce. In other terms, to advertise the car's potential. Ram air DOES NOT produce 20 hp, it may up the rating by 20, but the car isnt making that much power just from ram air, that barely is more effective if at all, than a good aftermarket CAI.

Yeah, What ^HE^ said! This post started out being a list of what people were running with stock or nearly stock LT1 cars. That was fun. I would like to see what kind of 1/4 mile times equally priced 4.6L Mustang GT's of the same years are running!!! 15.5's??? Somebody argue with me about THAT!!!

On the Ram Air note, I have a '97 SS and of course it has Ram Air. All I can say about the "It does nothing" vs. "It makes 100hp" argument is this:

"I have a coolass hoodscoop and You don't!!!" :D

C'mon folks let's hear some more "My car ran 13.xx @10x with just a thingamabob" posts...

Sucks being wrong doesn't it.

C'mon folks let's hear some more "My car ran 13.xx @10x with just a thingamabob" posts... :lol:

Ok seriously here lol, here's a nice little break down for you all, I've only been here a lil while yes, but that doesn't mean I don't know these cars.

in 93-95 the cambirds were rated at 275 horse 325 ft lbs. The 93 cars were speed density and have been rumored to actually dyno more rwhp on average than the 94/95 cars. 95's are the best cars to have in theory due to the fact they have both OBDI's which are easier to tune and vented opti.

96-97 cars standard were 285 horse 325 ft lbs due to an extra cat added. The ram air cars were rated at 305 hp 335 ft lbs.

98-00 LS1's were rated at 305 horse 330 ft lbs, Ram air cars were 320 horse 345 ft lbs

Just one thing both SLP created cars in 2002 had a 345 hp/350 ft/lbs option with either the dual-dual or the CME and Blackwing lid/Filter in the SS or the exhaust/lid option on the Firehawk. (The ratings are arbitrary though since just about every LS1 car is around 345-350 at the fly wheel)...


01-02 LS1's had the addition of LS6 intake and boosted power to 325 hp 350 ft lbs for the ram air cars and 310 335 for standard, although the 02 firehawk was rated at 345 horse 345 ft lbes


there :D

Just one thing both SLP created cars in 2002 had a 345 hp/350 ft/lbs option with either the dual-dual or the CME and Blackwing lid/Filter in the SS or the exhaust/lid option on the Firehawk. (The ratings are arbitrary though since just about every LS1 car is around 345-350 at the fly wheel)...



ahh, thank you for that addition Azrael, I wasn't even aware of those options to the 02 SLP cars.