A little boost goes a long way! :)
that would be awesome if something like that could work in the Z. Then having 500+ hp would be managable if it is limited in each gear range. I can imagine somehting like that would be a handful to tune though. Having to do dyno pulls in each gear for tuning?
Originally Posted by Sharif@Forged
The HKS EVC allows for speed based boost compensation, which could probably pretty well for keeping boost down at slowly speeds.
Many controllers can do boost per gear or by speed, such as the Turbosmart eboost and Apexi (Even the old school non-digital AVC-D did it by speed). Our preferred one is a Velocity Racing boost controller, it allows boost per gear, boost ramping in each gear, launch boost, etc. I don't see it on their site, but you can call them for info if interested: http://velocityracing.com/
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I was thinking that a gear based system would be more applicable to drag racing the 1/4 mile. On the road, you often find yourself in a different gear pattern and shift points, so maybe speed based would be better for the road. Just thinking out loud. 
I'd like to see someone get speed-based boost up and working. That would solve a lot of things
in the meantime, getting some really good tires, LSD, and a good alignment (no extreme camber in the rear) goes a long way with getting traction.
I'll never understood the logic some people have when they think being able to spin the tires in the first few gears is a good thing. You want the power, but you don't want to have out of hand loss of traction.
It's like getting 700whp and sticking with the stock clutch - I mean, what's the point if everything is just going to slip? Smoky burnouts in 5th gear is only cool for so long
You gotta figure the Z06 and viper etc all have really wide tires. We can't put tires that wide on the Z, but we can put stickier tires on the car and 295-315's are pretty wide anyway. Tire compound makes a huge difference and is worth it even though it's more expensive and wears out much sooner. You'll be so much faster being able to hook up the power vs lighting up the tires in every other gear with an unbalanced car as far as power vs traction
If you read the new MotorTrend article about handling with the 10 different cars, you almost couldn't read three sentences about the GT3 without them mentioning the Michellin Pilot Cup Sport tires it had and how sticky they were. The GT3 has smaller tires than the Z06, but they're so much stickier than the Z06's tires that it helped give the GT3 better traction and handling that it completely killed the Z06 in traction. Of course the Z06 was a much more powerful car, but all its power wasn't enough to fight against a car that made 100% use of what it had even though it had 82% the power the Z06 has
in the meantime, getting some really good tires, LSD, and a good alignment (no extreme camber in the rear) goes a long way with getting traction.
I'll never understood the logic some people have when they think being able to spin the tires in the first few gears is a good thing. You want the power, but you don't want to have out of hand loss of traction.
It's like getting 700whp and sticking with the stock clutch - I mean, what's the point if everything is just going to slip? Smoky burnouts in 5th gear is only cool for so long
You gotta figure the Z06 and viper etc all have really wide tires. We can't put tires that wide on the Z, but we can put stickier tires on the car and 295-315's are pretty wide anyway. Tire compound makes a huge difference and is worth it even though it's more expensive and wears out much sooner. You'll be so much faster being able to hook up the power vs lighting up the tires in every other gear with an unbalanced car as far as power vs traction
If you read the new MotorTrend article about handling with the 10 different cars, you almost couldn't read three sentences about the GT3 without them mentioning the Michellin Pilot Cup Sport tires it had and how sticky they were. The GT3 has smaller tires than the Z06, but they're so much stickier than the Z06's tires that it helped give the GT3 better traction and handling that it completely killed the Z06 in traction. Of course the Z06 was a much more powerful car, but all its power wasn't enough to fight against a car that made 100% use of what it had even though it had 82% the power the Z06 has
Last edited by sentry65; May 8, 2007 at 01:49 PM.
I would still prefer gear based for street driving because with speed based there is one inherent problem I see: wheel spin. If it starts to spin, speed based would ramp in more boost - hurting, not helping. Just like you, I am thinking out loud over here. Either way should do the trick. We have a couple of the VR ones in stock if anyone wants to try it out.
Originally Posted by Sharif@Forged
I was thinking that a gear based system would be more applicable to drag racing the 1/4 mile. On the road, you often find yourself in a different gear pattern and shift points, so maybe speed based would be better for the road. Just thinking out loud.
I would think gear based would be more effective on the street just because of the torque multiplication factors. Because at any given speed, you could feasibly be in 2-4 different gears depending on the situation. You'd want whatever the optimum amount of power for your gearing at a given engine speed rather than your wheel speed.
Just thinking, If I'm cruising at part throttle at 40mph in 4th, its no big deal what my max boost is at the time, gear or speed based. But if I downshift to 2nd, I want less boost than if I shifted into 3rd and went WOT because even if my engine output power levels end up being the same, 2nd gear is going to apply a lot more wheel torque than 3rd. Just want the engine power levels to be matched to the wheel torque for max traction / acceleration.
Just thinking, If I'm cruising at part throttle at 40mph in 4th, its no big deal what my max boost is at the time, gear or speed based. But if I downshift to 2nd, I want less boost than if I shifted into 3rd and went WOT because even if my engine output power levels end up being the same, 2nd gear is going to apply a lot more wheel torque than 3rd. Just want the engine power levels to be matched to the wheel torque for max traction / acceleration.
Originally Posted by sentry65
I'd like to see someone get speed-based boost up and working. That would solve a lot of things
in the meantime, getting some really good tires and LSD and a good alignment (no extreme camber in the rear) goes a long way with getting traction.
I'll never understand the logic some people have when they think being able to spin the tires in the first few gears is a good thing. You want the power, but you don't want to have out of hand loss of traction.
You gotta figure the Z06 and viper etc all have really wide tires. We can't put tires that wide on the Z, but we can put stickier tires on the car. Tire compound makes a huge difference and is worth it even though it's more expensive and wears out much sooner. You'll be so much faster being able to hook up the power vs lighting up the tires in every other gear with an unbalanced car as far as power vs traction
If you read the new MotorTrend article about handling with the 10 different cars, you almost couldn't read three sentences about the GT3 without them mentioning the Michellin Pilot Cup Sport tires it had and how sticky they were. The GT3 has smaller tires than the Z06, but they're so much stickier than the Z06's tires that it helped give the GT3 better traction and handling that it completely killed the Z06 in traction. Of course the Z06 was a much more powerful car, but all its power wasn't enough to fight against a car that made 100% use of what it had even though it had 82% the power the Z06 has
in the meantime, getting some really good tires and LSD and a good alignment (no extreme camber in the rear) goes a long way with getting traction.
I'll never understand the logic some people have when they think being able to spin the tires in the first few gears is a good thing. You want the power, but you don't want to have out of hand loss of traction.
You gotta figure the Z06 and viper etc all have really wide tires. We can't put tires that wide on the Z, but we can put stickier tires on the car. Tire compound makes a huge difference and is worth it even though it's more expensive and wears out much sooner. You'll be so much faster being able to hook up the power vs lighting up the tires in every other gear with an unbalanced car as far as power vs traction
If you read the new MotorTrend article about handling with the 10 different cars, you almost couldn't read three sentences about the GT3 without them mentioning the Michellin Pilot Cup Sport tires it had and how sticky they were. The GT3 has smaller tires than the Z06, but they're so much stickier than the Z06's tires that it helped give the GT3 better traction and handling that it completely killed the Z06 in traction. Of course the Z06 was a much more powerful car, but all its power wasn't enough to fight against a car that made 100% use of what it had even though it had 82% the power the Z06 has
295/35/18 pirelli corsas in the rear
http://www.tirerack.com/tires/tires....el=PZero+Corsa
I replaced my Michellin PS2's I had (same sizes) and the extra grip was very evident. Mine were even made a year and a half before I put them on, so they weren't really in their prime. They're supposed to last about 5000-8000 miles of "normal" driving with a treadwear of 60
They're pretty nice tires IMO, but I think they're slowing being phased out of production. There used to be a couple other sizes that are no longer available and Tire Rack is charging a lot for the 295's now (especially the rights) and you can't even get 315's for the right side anymore (they're directional tires)
anyway, the Nitto NT-01, Nitto NT555RII, Yokohama A048, Michellin Pilot Sport Cup, and a few others are all worth looking into for more traction and better handling without having to resort to using drag radials with soft sidewalls - which will have better overall straight line traction than normal competition tires
here's an overview link
http://www.europeancarweb.com/tech/0...e_r_compounds/
all R-compound tires work their best when really heated up, but a lot of them don't need much heat in them at all to grip really well. Just normal driving can get them heated up enough to work way better than a normal street tire. A lot of the modern R-compounds are at least partly designed for auto-x where the tires don't get a chance to get really really hot. Either way, the tread pattern also puts more rubber in contact with the ground.
One of the main differences between R-compound and normal street tires is that R-compounds don't rely mostly on friction for grip. As R-compound rubber heats up more, it actually chemically bonds to the ground and gets a large part of its traction that way. That's mostly why the work so much better when heated up.
http://www.tirerack.com/tires/tires....el=PZero+Corsa
I replaced my Michellin PS2's I had (same sizes) and the extra grip was very evident. Mine were even made a year and a half before I put them on, so they weren't really in their prime. They're supposed to last about 5000-8000 miles of "normal" driving with a treadwear of 60
They're pretty nice tires IMO, but I think they're slowing being phased out of production. There used to be a couple other sizes that are no longer available and Tire Rack is charging a lot for the 295's now (especially the rights) and you can't even get 315's for the right side anymore (they're directional tires)
anyway, the Nitto NT-01, Nitto NT555RII, Yokohama A048, Michellin Pilot Sport Cup, and a few others are all worth looking into for more traction and better handling without having to resort to using drag radials with soft sidewalls - which will have better overall straight line traction than normal competition tires
here's an overview link
http://www.europeancarweb.com/tech/0...e_r_compounds/
all R-compound tires work their best when really heated up, but a lot of them don't need much heat in them at all to grip really well. Just normal driving can get them heated up enough to work way better than a normal street tire. A lot of the modern R-compounds are at least partly designed for auto-x where the tires don't get a chance to get really really hot. Either way, the tread pattern also puts more rubber in contact with the ground.
One of the main differences between R-compound and normal street tires is that R-compounds don't rely mostly on friction for grip. As R-compound rubber heats up more, it actually chemically bonds to the ground and gets a large part of its traction that way. That's mostly why the work so much better when heated up.
Last edited by sentry65; May 8, 2007 at 01:47 PM.