OIC, so he backs off the throttle during the elims..?
If he had .5 sec on that Trans Am he wouldn't have had to cut the tree so close to earn a red light.
Per the rules they only give you 10 gallons of fuel for the 30 mile cruise, qualifying, and one round of racing; so we were trying to conserve as much as we could.
Plus we didn't know how well the track was taking to us trying to lay down the power with the amount of rain that came down the night prior.
You're right about the need to tree him, but racers are racers, and always want to be first at everything. I can't neccesarily blame him! He made up for it by piloting that 7.993 pass!
Per the rules they only give you 10 gallons of fuel for the 30 mile cruise, qualifying, and one round of racing; so we were trying to conserve as much as we could.
Plus we didn't know how well the track was taking to us trying to lay down the power with the amount of rain that came down the night prior.
You're right about the need to tree him, but racers are racers, and always want to be first at everything. I can't neccesarily blame him! He made up for it by piloting that 7.993 pass!
The motor is able to generate sufficient exhaust gas to propell the large turbine wheel fast enough to create instanteous boost off the line verses boost lag.
The motor is able to generate sufficient exhaust gas to propell the large turbine wheel fast enough to create instanteous boost off the line verses boost lag.
There was huge lag (about 2 seconds) on those turbos (no antilag that I heard). Did you even watch the video? Lee has so much left on the table it's crazy. If Lee wants/needs to go faster, he has a lot more to play with.
Last edited by The Former PFR : May 13th, 2008 at 01:31 AM.
I saw the video and the car got out of the hole like a bat out of hell. With the engine being very loud, I couldn’t differentiate when the turbos actually spooled up. I was surprise the there was little or no boost lag at all on such a big turbo. It looked like it left the line in full boost. I’m not sure if your definition and mine regarding boost lag “turbo spool up time” are the same. When selecting a turbo, you would need to match it up the output of the motor to the sweet spot on the compressor map of the turbo to get the best efficiency. For example, if 91 mm turbo went on a 4 cylinder car, its small motor output would probably not be sufficient enough to generate 1 lb. of boost pressure until the car got up to 80 mph in order for enough exhaust gas volume and velocity to spin the big turbine. Sometimes when you go with a turbo that is too big for a motor, it could result in slower times. In Lee’s case, he made an excellent choice. I was going to use 88 mm on my car but after seeing Lee’s I’m definitely getting at least 91 or 94 mm.
There was huge lag (about 2 seconds) on those turbos (no antilag that I heard). Did you even watch the video? Lee has so much left on the table it's crazy. If Lee wants/needs to go faster, he has a lot more to play with.
Im going to have to agree with Corey.
Compared to other vipers this one has the most lag I have heard yet. Don't get me wrong it aint supra type lag and still hauls ass with plenty more left.
I saw the video and the car got out of the hole like a bat out of hell. With the engine being very loud, I couldn’t differentiate when the turbos actually spooled up. I was surprise the there was little or no boost lag at all on such a big turbo. It looked like it left the line in full boost. I’m not sure if your definition and mine regarding boost lag “turbo spool up time” are the same. When selecting a turbo, you would need to match it up the output of the motor to the sweet spot on the compressor map of the turbo to get the best efficiency. For example, if 91 mm turbo went on a 4 cylinder car, its small motor output would probably not be sufficient enough to generate 1 lb. of boost pressure until the car got up to 80 mph in order for enough exhaust gas volume and velocity to spin the big turbine. Sometimes when you go with a turbo that is too big for a motor, it could result in slower times. In Lee’s case, he made an excellent choice. I was going to use 88 mm on my car but after seeing Lee’s I’m definitely getting at least 91 or 94 mm.
Listen to the engine. He didn't leave the line with anything close to full boost. He was well past the 60 foot mark before the turbos fully spooled. I believe he made an excellent choice in turbo, but they weren't using any antilag at all. Had he used antilag, he would have probably gone considerably faster. I am sure they know this (I am not dropping any amazing knowledge here), but probably wanted to leave something on the table so the competitors wouldn't be able to have a clear goal for next year.
Now, onto selecting a turbo. Yes placing your engine's output in the efficiency island is all well and good, but that is turbo selection for newbs. If you really want to put the right turbo on an engine, you gotta be looking at the turbine map as well. I could build a 91mm turbo that would spool fairly well on a 4 cylinder. It would be a T3/T6 hybrid (and look really funny). Unfortunately, it would also fall off like a bitch when the hot side choked the motor. Now, I gotta ask what you are building that you feel you need a 91mm for?
