SLP Cold air intake....Worth the money?

[XfireZ51]

Bob,

You should speak w Pete. He ran 4.10s and went back to 3.45s. His 1/4 times and traps were nearly the same either way.

[Bob Eyres]

Pete's car is the strongest 350 stock block car I've ever seen. It's banging on the tens, even with a stock gear in the rear. But compare it to another legendary ZR-1, the white 415 built for SW by John Lingenfelter (now owned by WydGlydJim). This car has at least 100hp. more than Pete's, same IRS rear end but in this shot it is running 4.10 gears and does the quarter using all four gears.

http://www.youtube.com/watch?v=3ZrNvJxDD-

http://www.youtube.com/watch?v=SFNFOhGGlR4

I'm just saying that white car launches so well because of the gears and tires. And that the 675+hp 415 doesn't overpower it.
Just a guess, but I think that setup in Pete's car would get it deep into the tens. JMHO.

[Hog]

Originally Posted by USAZR1

4.10's are good for 130mph in 4th. I'm sure David's ZR-1 is fast in the 1/4 but it isn't that fast.(unless he's running a 250 shot)

I must have misunderstood what he was stating. I took it as he had to **** to 5th gear to get through the 1/4 mile.

[Fully Vetted]

My understanding from other ZR-1 owners with 4.10's was that they had to shift into 5th to finish the 1/4 mile. I don't have 4.10's so I don't know that to be true. But that is what I've heard.

[Bob Eyres]

Originally Posted by Fully Vetted

My understanding from other ZR-1 owners with 4.10's was that they had to shift into 5th to finish the 1/4 mile. I don't have 4.10's so I don't know that to be true. But that is what I've heard.

Dave- I can assure you, that's not the case.
4.10's at 7,000 are at 130+, and at 7,500 are at 140+. That means that unless you have 550+ hp. or more you are not even using the full range of rpm that the 4.10's allow at the strip.
With a stock motor and 4.10's I usually go through the traps at 6.300 to 6.500rpm., well under the redline.

That means that 4.10's are still a "compromise" gear for the quarter mile. There is debate over whether 4.30's, or 4.56's are the ideal gear at the drag strip if you want to use all four gears.

[mgg]

One thing that has now been mentioned is how much nicer it is cruising in 6th gear with the 4:10s. A stock L98 in 6th has a bit of a low end advantage torque was which Gm found acceptable, even with 3:33 gears in 1990. Having bought one of these cars new it was marginally acceptable to be in 6th at 60mph. With only 4700 rpm to play with I understand it. However, a ZR-1 in 6th with 3:45s is just a frickn dog at legal highway speeds. NOt that 4:10s turn it into a torque monster by any stretch but it is much more pleasurable to drive and doesn't seem strained at all. With the rpm these cars have to play with it really seems to me to be a great gear for the street. I was actually schocked when I first drove my car after I installed the 4:10s as to how well they worked. I was really worried it might be too much but it is not even close. I could not be happier. As we have all discussed everyone uses his or her car differently, my best suggestion to anyone who is even considering the change to 4:10s or any gear for that matter is find a car with that gear ratio and go for a ride and drive. You will then have all the facts for yourself if it is in fact right for your needs.

[Kevin]

I'm not sure the l98 actually has a low end advantage in torque. I know if feels that way but I"m not sure if it's true

[KILLSHOTS]

Originally Posted by mgg

One thing that has now been mentioned is how much nicer it is cruising in 6th gear with the 4:10s. A stock L98 in 6th has a bit of a low end advantage torque was which Gm found acceptable, even with 3:33 gears in 1990. Having bought one of these cars new it was marginally acceptable to be in 6th at 60mph. With only 4700 rpm to play with I understand it. However, a ZR-1 in 6th with 3:45s is just a frickn dog at legal highway speeds. NOt that 4:10s turn it into a torque monster by any stretch but it is much more pleasurable to drive and doesn't seem strained at all. With the rpm these cars have to play with it really seems to me to be a great gear for the street. I was actually schocked when I first drove my car after I installed the 4:10s as to how well they worked. I was really worried it might be too much but it is not even close. I could not be happier. As we have all discussed everyone uses his or her car differently, my best suggestion to anyone who is even considering the change to 4:10s or any gear for that matter is find a car with that gear ratio and go for a ride and drive. You will then have all the facts for yourself if it is in fact right for your needs.

This sounds too reasonable to me. I would plead with everyone: PLEASE make absolutely sure that you fully understand EXACTLY how many miles per hour your car will be going in 4th gear as you pass through the 1/4 mile trap. It is absolutely paramount that you have this worked out to within 1/27 of 1 MPH. Otherwise, don't even consider a gear change; the ONLY consideration should be altering shift points and speed on a drag strip.

[Vette73]

I am a new member and see a lot of members
With this set up,actually,a large percentage..

Back in the day if you had 4:11 gears you were always in the right
Lane on the highway......Since there are practically no ZR1s where I
Reside (Bk Ny or anywhere close) I'm going to have to
Take the word of the members....

Maybe to play it safe down the line 390s? .Undestand,I really
Won't be doing any consistent excessive speed on the
Highways,so gears wouldn't be a bad idea...Just,which size .

( 91 blk/blk ZR1 # 428)
(73 Stingray Convertible)

[KILLSHOTS]

Originally Posted by Vette73

I am a new member and see a lot of members
With this set up,actually,a large percentage..

Back in the day if you had 4:11 gears you were always in the right
Lane on the highway......Since there are practically no ZR1s where I
Reside (Bk Ny or anywhere close) I'm going to have to
Take the word of the members....

Maybe to play it safe down the line 390s? .Undestand,I really
Won't be doing any consistent excessive speed on the
Highways,so gears wouldn't be a bad idea...Just,which size .

( 91 blk/blk ZR1 # 428)
(73 Stingray Convertible)

If you want to "play it safe", my advice would be to keep your stock gears AND your money. It's an expensive mod and if you're going to spend that much money, get some bang for your buck and go to at least 4.10s. I'd go to 4.30s or 4.56s if I could do it over again, because I want my car to accelerate hard and I could not care less about all this shift point nonsense. Just the humble opinion of a guy who already paid to have this done.