Massive turbo acceleration....

[wrd1972]

I drove a co-workers 2500 pound Mazda Miata 1.7L today, it has 15 LBS. of bolt on turbo boost and neck snapping power
I had never driven a turbo four banger before but I was big time impressed.
The power was mild until about 3.5K RPM, then the turbo kicked with massive scary power to 7K. It would pin you to the seat like nothing I have ever driven. It will most certainly embarass my 3500 pound Z28 at the strip, although I might get him off the line and through first gear but thats about all.
Now I understand my LT1 has a flatter and much wider torque curve but I can only imagine what an LT1 turbo would do. I have seen the STS remote mounted turbo but OMG thats a lot of money. I really wish I could see and here this setup on someones near stock car.
Oh well, im still a die hard f-body fan and im not getting a turbo four banger, but damn that was a fun ride.
Maybe one day I will spend some money on upgrades, im just leary of taking the motor apart to do it.

[97LT1Z28]

Eventually, when the miles add up, you'll hit a point where you'll need a motor rebuild. That's when you can yank it out and build it up for your mods like supercharger or turbo. That's what I plan on doing - and with about 130,000 miles on the ticker, it's gonna be in the near future!

[Joe 1320]

The whole reason it felt so good is the low curb weight. Cut 700 lbs off the average f-body and you would be suprised at how different the car feels.

[wrd1972]

I do agree with the weight thing, even when I have a passenger I can feel power loss althought slight. He also had his car on a diet.

[Performin Norman]

It's all about power to weight ratio. A lighter car allows better performance in all areas of the spectrum.

I have lots of buddies here in KC with cars that are putting down much higher RWHP than my cars and I can still pull them pretty hard. It's mostly because of P/W ratio.

[f-bodyadmin]

I feel funny replying.. its been so long..

Norman is 100% right... and don't forget ole' gear ratios... that can play huge havic with one's brain. two side by side Z28s from the factors with no difference other than a gear change can make an "appearing" difference. Both cars will dyno the same number, but one car will smoke the other in a race... put the cars side by side... eventually they will be next to each other

[wrd1972]

Can someone go into great detail the differences one can expect by going from 3.42 to 4.10 with the six speed. I have thought about but I have heard conflicting opinions. It would seem to me the engine would rev up faster in all gears.
Right now my car redlines 1st at about 45 MPH, what would the 4.10 redline at?
What could one expect in respect to 0-60 and quarter mile. I have really good tires so traction should not be too bad.
Thanks
All

[Performin Norman]

I feel funny replying.. its been so long..

Norman is 100% right... and don't forget ole' gear ratios... that can play huge havic with one's brain. two side by side Z28s from the factors with no difference other than a gear change can make an "appearing" difference. Both cars will dyno the same number, but one car will smoke the other in a race... put the cars side by side... eventually they will be next to each other

Check out the newbie, he only has 46 posts. LOL

[TruckMuddr]

Well, 2 of the same cars but with different gear ratios will dyno differently(chassis dyno). Same thing as dyno'ing in 2nd gear vs. 3rd gear.

[Jeff_in_Atl]

Check out the newbie, he only has 46 posts. LOL

That's what I was thinking. The admin only has 46 posts. But we love ya anyway!

[f-bodyadmin]

before we switched to vbulletin.. i had tons of posts... so...

[Rhode Island Red]

before we switched to vbulletin.. i had tons of posts... so...

yes you did

[Jay 02 TA ws6]

Can someone go into great detail the differences one can expect by going from 3.42 to 4.10 with the six speed. I have thought about but I have heard conflicting opinions. It would seem to me the engine would rev up faster in all gears.
Right now my car redlines 1st at about 45 MPH, what would the 4.10 redline at?
What could one expect in respect to 0-60 and quarter mile. I have really good tires so traction should not be too bad.
Thanks
All

I wouldn't go to a 4.10 with a stock h/c setup, especially not on an LT1.

You're exactly right about it reving up faster in each gear... Think about it... first gear accelerates harder than second, second harder than third, etc... right?

Going to a 4.10 makes each gear lower, or faster... but by the time you are shifting in to 4th, you're going to start losing that advantage, because other guys are still going to be in lower gears. 4.10s are great for lower speeds, but will leave you dead if you have a stock heads/cam setup once you get to higher speeds...

If you want to really take advantage of a 4.10 rear, then do some valvetrain mods to get the car reving to 6500... that way your shift points stay at the same (or higher) mph, and you still get the advantage of the faster acceleration through the gears.

[Injuneer]

Can someone go into great detail the differences one can expect by going from 3.42 to 4.10 with the six speed. I have thought about but I have heard conflicting opinions. It would seem to me the engine would rev up faster in all gears.
Right now my car redlines 1st at about 45 MPH, what would the 4.10 redline at?
What could one expect in respect to 0-60 and quarter mile. I have really good tires so traction should not be too bad.
Thanks
All

The gear ratio is also a "torque multiplier". A set of 4.10's will put 20% more torque to the rear wheels, which means the wheels will be able to apply 20% more force to drive the car forward. Since F=ma, increasing the force increases the acceleration proportionally. You will fell 20% more G's off the line.

As you note, you will run out of gear faster, approaching redline in that gear 20% sooner. You will have to shift 20% sooner.... and if you don't shift efficiently, you may be losing on the shifts what you gained on torque multiplication. And, if for example your car was capable of 115MPH in the 1/4-mile, going to 4.10's would force you to shift into 5th gear (O/D) at the end of the track and slow you down a bit.

Some shift points, assuming 5,800rpm:

GEAR - 3.42 - 4.10
1 - - - 48 - - - 40
2 - - - 73 - - - 60
3 - - - 100 - - 83
4 - - - 129 - - 108
5 - - ~155* - - 147 **

* = aero drag limited
** = RPM limited

As far as a "rush" when the accel pedal hits the floor.... how many of you have driven a 1,000+ HP F-Body? How many of you have sat in the pasenger seat of a 1,325HP F-Body? I have (97 30th SS convertible, 383 w/ 20+# boost), and its the most unbelievable thing I have ever felt.... it pins you in the seat, and get the adrenaline flowing like nothing else I have ever experienced. Put that car up against the Mazda, and unless the Mazda can run 8.6@160mph, it hasn't got a chance.....

[Jeff_in_Atl]

...As far as a "rush" when the accel pedal hits the floor.... how many of you have driven a 1,000+ HP F-Body? How many of you have sat in the pasenger seat of a 1,325HP F-Body? I have (97 30th SS convertible, 383 w/ 20+# boost), and its the most unbelievable thing I have ever felt.... it pins you in the seat, and get the adrenaline flowing like nothing else I have ever experienced.....

I've pulled 4.5 Gs in a Pitts S2B. That was the most unbelievable thing I have ever felt. http://home.nwn.de/stampe/pitts.jpg