I recall in his original 3.90 thread him being concerned about beating exotics at very high speeds. He was worried the 4.10s would lower his top speed. Since he is a customer of yours, I'm sure he explained his goals for the car so you would know better than me. He's also claiming 80-130mph being faster.

So again I ask my question for whomever has the ability to answer it. Given two identically powered cars. One equipped with 3.90s and one with 4.10s. Is there a speed(realistic speed, not 220+mph) in which the 4.10s will stop pulling and the 3.90s will start to edge them out?

0-100, 30-150, 80-130 etc.? whatever....trying to learn.

 

Just an FY, I just got back from a run on a "privately owned farm road", 3500rpm in 6th on my car was about 119mph, no need to shift, thats a far cry from 65-80mph


Ed, is there any possibility that your clutch was slipping badly with the 410's? New clutch may be the reason you feel the car is faster? Your rpm's are reported higher than they should have been, and your mileage was way off with the 410's. I know clutches dont usually slip in that fashion, but maybe you were getting slip and not realizing it??

 

The only time there is any advantage would be if the race ends at speed where the 3.90s aren't forced to shift to 5th but the 4.10s are.
Roughly speaking, 7000 rpm in 4th is 136 MPH. For 3.90s its 143. So race to 140 mph might favor 3.90s since there is any extra shift there and the 4.10 car finishes in 5th gear. Offsetting that is the 4.10 car should get to 136 MPH faster. Does it to get 136 mph fast enough to overcome his shift time, I don't know.

Its a 5% difference from 3.90s to 4.10s. I tend to think of gear changes in terms of at least 10% or more for a street car. 3.42 --> 3.73 --> 4.10 --> 4.56. Calculations for the track tend to take advantage of 5% changes, but at the track you have measurable, and hopefully repeatable performance. Rolling street races (e.g. Going on 3 honks or until it too dangerous to not let off) just isn't that percise in my observation, but then again I'm not a big street racer.

Since modifying a car results in tradeoff, I'm also supporter of the drive what makes you happy.

 

Ed once told me to delete a post where I laid into you (which I deleted), and now I'm surprised because this post is pretty condescending towards Ed... for his applications, he now has what he wants.

I understand you know a lot about cars, and I respect that. I don't deny that 4.10s are going to make a better straight-line performer, and 4.56s will be even quicker. But for some of us, the Corvette doesn't begin and end life at the 1/4 mile. For REAL racing (road courses), which gearset is better? And what about people who still street drive their cars on a daily basis? What about people who enjoy their car on the street carving twisties, and cruise home on the highway afterwards in 6th gear at 80MPH? Are 4.10s the answer to them?

I still won't get get 4.10s for my Z51 ever, unless my goal was to bastardize it and turn a Corvette into a drag-only car. But why? That's what the Mustang and Camaro are for.

 

Ed is a very happy child right now, he did what he set out to do, Ed took on a Murci on a private, closed off strip from a 30mph roll all the way upto 165......Murci never stood a chance from the go, Ed rolled away from the Murci at a constant gradual rate. At 165, the Murci was 4 car lenths back......

 

 

have you seen Ed shift

 

Oh don't even go there , mr.clownshoeshifter !!!! dont even

12.1 with a forged LS7 motor hu??? nice job

 

yeah except we (doug and I) stopped at the 1/8 for coffee and donuts and then finished (we were running the 11.50 index at Etown and thought we were closer to the 11.50 than we were so we backed off ).

if you want me to slap on DRs and show you how fast the car is I will gladly do it for you Ed....

 

Like anyone is actually listening to you, stop wasting key strokes..

The 4.10's will always be ahead in every shift. At 450rwhp both cars will most likely hit 200mph, at which point the 4.10 geared vette will get there first. There will be a point that the 3.90 will catch up and pass the 4.10 geared car (ever so slightly,) theoretically somewhere on an open road 4.10 geared car red lines in 6th, the 3.90 still has 150-200rpms before red line.

Well, this is all talk in the real world at 450rwhp will the 3.90 geared car pass the 4.10 geared car to 200mph? Most likely not.

Ed took me for a ride, I can say with certainty that his clutch wasn't slipping whatsoever under WOT.
Bastersize? That is a bold statement with someone that doesn't have 4.10's. I have been driving with 4.10's for 2 years and would never go back to 3.42's. 4.10's does not turn the Z-51 Ls2 or 3 into a 1/4 mile drag car only. What Ed did is what suites Ed's style of driving, but I must disagree with him on the 50-130 roll statement that the 3.90's were faster..

What method of measurement was used to gauge the acceleration? Sotp feel? Come on now, the 4.10's would hands down be faster in every gear since the rpms are higher, so how could the lower rpm 3.90's be faster? At the end As long as Ed is happy that 's all that matters. And heck he got a Murci under his belt today..

 

Where are the vids????

I love my 4.10s and would not go back to 3.42s...they suit my driving style and I still get 29 mpg on the highway.

FWIW, if the Dvl is happy and can get the job done, that's all that matters.

 

Thanks Cameron. That's what I was looking for.

You got pm.

The debate over 3.90s vs 4.10s for a road course was settled long ago and most, if not all are in agreement on that.

Ed doesn't seem like much of a 1/4 mile racer either. He likes to cruise on the highway and chase down euro supercars. My H/C 4.10 Z51 is a street driven daily driver. I have no complaints about cruising on the highway or putting around town. I don't understand the mpg/rpm results that Ed has witnessed. They do not correlate at all with mine and several other similarly equipped cars. Cruising in the 65-80mph range in 6th I'm nowhere near 3500rpms....?

Yeah but if you kept the 4.10s it would have been 5-6 car lengths back

 

I didnt have the cam with me , there are some vids out there, I'll have to wait till they surface

mission accomplished




http://forums.corvetteforum.com/show....php?t=1996166
enjoy the pics guys

 

My Z51 4.10 geared vette is FAR from bastardized or a drag only car. It's so much more fun on the street, acceleration is enhanced, and if you compare the gear ratio's with other cars out there you'll see how much better the gearing is now (w/4.10's) then the stockers. Ever wonder why a seemingly heavily underpowered Porsche 911 can nearly run heads up with a stock Z51 vette in 0-100? A lot of the reason is the gearing.....do you consider a Porsche a bastardized 1/4 mile only car?

I'll also make this statement about MPG. While it's true you lose a bit on the highway, around town I've seen BETTER fuel economy. Reason is I used to cruise in 4th, 5th was hardly ever used. But now 5th gear is my economy gear around town, it's rpms are a bit lower then 4th used to be but it still accelerates. So around town when I'm not in fun mode, it's little better on gas. In the end the total trade-off is I've about 1mpg less on my average reading (on the DIC), and that's with getting on the throttle more often.

Honestly if people could drive a 4.10 geared vette for a couple weeks, they would say the slight loss of MPG is well worth it.

 

By saying "bastersize" (???), I was referring to the act of making a Corvette into a drag-only car, not the act of merely installing 4.10s. Just swapping rear-end gearing with 4.10s won't ruin the C6, but prepping it solely for a life of straightline 1/4 mile driving will.

 

I am sorry but the majority here don't convert their c6 into drag car only, if you can point out a specific forum member here besides "dennisnj50" would be a rare occurance. It is safe to say that 97% of vette owners don't 1/4 mile drag race their vettes specific only.

Therefore, 4.10's are the gear of choice for many street racers or/and daily drivers looking for the quick acceleration and performance (1/4 mile or otherwise) without the incurred cost of a supercharger or heavy engine modification to achieve the desired acceleration.

 

Totally off topic, did the police write you??? Say no, PLEASE!!!!

 

nope

 

Police only stop guys that swap out 4.10's for 3.90's!

 

Pwned !