unknown_host

iTrader: (1)

What is the best anyone has 60' with an L98 with 2.77 gears?

What should my 1989 Iroc L98 with 2.77 gears, drag radials, underdrive pulleys, Hedman shorties and y pipe and a 2800 Summit converter 60'?

unknown_host

iTrader: (1)

To further my question, last season without headers or drag radials my best ET was on a 2.28 60' with limited traction. Do you think an L98 could pull a mid 1.9 60'?

Why I am wondering - my best ET last season was 14.64 @ 94.49 on a 2.28 60' which was very disappointing.

2.28-1.95 = .33 off my best ET. I have heard a tenth on the 60 is as much as a 1.5 tenths at the big end, so there is a possibility of taking .33 to .45 off my ET with a good set of drag radials right?

skirkland1980

iTrader: (2)

I'm not really sure what you're wanting to do. If you want to know what the quickest time is with your car then yes drag slicks will do the job if your rear suspension is upgraded with lca relocation and aftermarket lcas. Otherwise you would experience so much tire shake that your 60' would suffer.

Orr89RocZ

iTrader: (20)

My L98 with headers exhaust and 2 deg base timing added, on 245/50/16 street tires went 1.89 60 foot with 2800 stall 2.77's

Slicks i eventually got down to 1.79 before it broke but more in it, slicks were old. Fresh tires and 3.42 gears 10 bolt swap, i got down to 1.74-1.75 i think? Maybe tad better. Stealth ram swap and few other bolt ons i went 1.71

1320_Guy

iTrader: (3)

You should have been able to get 1.9s stock.

unknown_host

iTrader: (1)

Ok that's what I was asking, I didn't mean to confuse anybody. My best 60' was a 2.12 before I installed the converter. After the converter the car spins and 60's worse, but ET's better.

Right now I am racing on factory size 16" Toyo Proxes tires that came on the car when I bought it.

I was thinking of running either Nitto Drag radials or Mickey Thompson ET drag radials on the stock rims.

So you guys wouldn't be shocked at a mid to low 1.9 with good traction?

PhoenixFirebird

iTrader: (2)

My headers/tune only 305 went as low as 2.02 60', so I agree that 1.90s are possible stock.

Orr89RocZ

iTrader: (20)

Like said it has been done and 1.9's arent that impressive. I was able to walk it out the hole on street tires to a 1.89. L98's have enough power to do 1.7-1.8's all day long on good tire

unknown_host

iTrader: (1)

Sweet, so I will quit beating around the bush, I was very disappointed that my car went 14.6's this season. If my car could pull a good 60', I could be a tenth or two from running in the 13's?

1320_Guy

iTrader: (3)

What size and brand of tire are you running?

Orr89RocZ

iTrader: (20)

Find a good day to go to the track, watch the density altitude. Strong l98 under 2000 ft da should be 96-98 mph traps with basic exhaust mods. Some faster. Colder days i have done 100. Mostly 96-98 tho. Thats good for 13's.

You cut 2 tenths off the 60 you should see .3-.4 in quarter. Ice the tpi plenum and see another tenth or so. Usually worked well for me, tpi gets heak soaked

Buy some 16" drag radials, mickeys or nitto nt05r if they make a 16"

unknown_host

iTrader: (1)

So my car had stock manifolds, no cat, stock exhaust pipe and a 3" Magnaflow muffler in the stock location.

I have since then installed a set of Hedman 1 5/8" shorties and the matching hedman Y pipe.

Not only did my factory Y pipe suck, it also had a giant dent in it that couldn't have been helping



Just looked up the NT05R and they are for 17"+ wheels.

Orr89RocZ

iTrader: (20)

Headers should help a good bit. I felt the improvement on mine

xpndbl3

iTrader: (5)

m/t drag radials will help, although you'll get 3-5k miles out of them if you baby them. But if you want traction, that's the way to go. Why not swap in a better geared rear end as well? It's a cheap investment for the gains.

unknown_host

iTrader: (1)

I have a 9 bolt, I bought a 3 series carrier and 3.27's on the forums, just need to either install them myself or find a shop to install them.

skirkland1980

iTrader: (2)

Any rear suspension mods? Tire shake will slow you down.

unknown_host

iTrader: (1)

No suspension mods yet

mw66nova

iTrader: (13)

don't waste time on the nittos. get the mickey thompsons and be done with it

unknown_host

iTrader: (1)

10-4 good buddy.

ZONES89RS

iTrader: (2)

ET streets are what I always use because that's the deals I find. They dead hood for me at the track.

With 4.10s and a 5 speed I hit mid 1.8 sixty foot times. That was taking it easy, and the ring gear broke anyway.

mw66nova

iTrader: (13)

if this was a stick car, i'd recommend the et streets, but he'll be faster on a radial with an auto

ZONES89RS

iTrader: (2)

Think so? I have never had a problem sticking Witt ETs, unless we are talking MT drag radial, which is pretty much a slick, lol.

mw66nova

iTrader: (13)

of course i'm talking about a mt drag radial...why would i talk about anything else? the radial tire is proven to be faster than a bias ply

skinny z

Is this a full slick you're making comparisons with? Something along the lines of MT ET Drag vs MT ET Radial?

mw66nova

iTrader: (13)

yes, in an auto, almost always, once the car is setup correctly, the radial is faster. radials were worth .10 on my car...but they weren't as repeatable on a marginal track, so i went back to a slick.

skinny z

If the OP is looking for a little data, I can say that my old combo went a best 60' of 1.71. That was with 3.27 gear, 700R4, foot brake 2000 rpm launch. The tires were old McReary dirt track tires, 27"x10". My 60' was a little slower when I went to a 3.70 gear (the 9 bolt broke on that pass too). Stock shocks, LCAR brackets and some other aftermarket suspension bits.
I've since switched to a 26x10.5" ET Street and with a stronger engine package and a 3.73 (Dana 44) I haven't managed any better than a 1.8 on a cold and lightly prepped track. Tire pressure was as low at 10 psi with 10 psi preload in the Air Lift drag bags.
I'd really like to be sub 1.7's and I feel it's in the present combination, tire choice notwithstanding. I've thought of stepping up to a 28" drag radial (the ET streets have seen better days as they're old) hoping that the larger diameter will both offset the rear gear and have a slightly larger footprint. I'm just not certain how the radial will respond.

unknown_host

iTrader: (1)

Thanks for all the good info guys. I am thinking a minimum of a 1.9 60' shouldn't be a big deal.

I never bought drag radials for my old car, because I could make it hook on 275/50/15 BFG Radial T/A tires. It used to 60' in the high 1.7 and low 1.8 range with a 3000 stall and 3.73 gears with stock suspension.

However, it was a Berlinetta and the suspension was pretty worn out with a lot of travel, I think it had a lot of weight transfer for what it was. As soon as the nose came up you could roll into the gas and not spin on radials. I just preloaded the converter, left and quickly rolled into the gas and I could repeat.

Proof:



I kind of assumed I would have similar luck with the Iroc, never assume I guess. The Iroc - no burnout, burnout, off idle, on the converter, seems to want to spin leaving. It's not like it's a horsepower machine either .

Orr89RocZ

iTrader: (20)

The irocz suspension is pretty stiff, I find I hook better with an adjustable shock, set light up front and medium in the rear

ZONES89RS

iTrader: (2)

Just making sure Matt, because a Nitto is not gonna work like the MT DRs, they are in a class of their own to me.

mw66nova

iTrader: (13)

please refer to post 18

unknown_host

iTrader: (1)

Just to clarify, if I want to run my stock wheels is the 26/10.5/16 the correct size MT?

plum92_camaro

i ran 255/50r16 bfg drag radials. i would put them up against the mickeys. they are about $50 cheaper for a pair. I have absolutely no complaints. the do get a little harder after about 5years. My buddy runs them on his 69 cutlass with a built 455. You won't regret the bfg's.

unknown_host

iTrader: (1)

Where do I find those at?

ZONES89RS

iTrader: (2)

I did, just not the next time I replied. Sorry.

mw66nova

iTrader: (13)

well, in order of awesomeness, radial tires go like this:
1. M/T Pro275
2. Hoosier Drag Radial
3. M/T ET Street Radial
4. BFG Traction Advantage
5. Nitto NT05r
6. Toyo Proxes TQ
7. Nitto NT555r

all of these will stick a stock l98 to the ground, but you will find the limit of the bottom tires with just bolt-ons and a converter.

ZONES89RS

iTrader: (2)

I could agree.

Does make me not too happy nitto will not make the NT05 tire in 15 in options.

I will say, the Nitto is the best bang for the buck (555r) for a street car. I beat them and abused them and never once did I get scared driving them in the rain with 4.30s and the 6 speed with the 6 liter. They absolutely shine in every day driving.

unknown_host

iTrader: (1)

I just saw those Toyo Proxes tires for the first time last night, they are only 150 a piece on Tire rack.

unknown_host

iTrader: (1)

What do the BFG 255/50/16 tires look like? Depending on which site I go to, they are either a radial looking tire with a smooth center patch, or a newer looking radial tire. Are there two different versions of them?

ZONES89RS

iTrader: (2)

One is a radial the other is a drag radial.

unknown_host

iTrader: (1)

Here is what I am talking about:

BFG G-Force T/A Drag Radial 2 from www.tirerack.com:



BFG G-force T/A Drag radial from www.summitracing.com:


So after reading on tirerack, I found this:

Tire Rack Name Tread Design BFGoodrich Clarifier
g-Force T/A Drag Radial Directional NT = New Tread
g-Force T/A Drag Radial 2 Asymmetric TT = Traditional Tread

Anyone have experience with these?

mw66nova

iTrader: (13)

The 255/50/16 looks like the top picture.

The toyo is a badass looking tire. Here is what a 345/40/17 looks like on the chevelle project I'm building for my wife

unknown_host

iTrader: (1)

Do you think the Toyos would hook Matt?

unknown_host

iTrader: (1)

Your wife's car is coming along nice those Toyos have a cool look to them.

ZONES89RS

iTrader: (2)

What size wheel is that Matt? 11?

mw66nova

iTrader: (13)

no idea. i hope so...i bought them because of the size and the price. i wanted a 28" tall tire and didn't want to kill the bank. got these from a buddy for $250 delivered.

thanks! yes they do.

17x10.5. 7.5" backspacing, 1.5" spacer.