david buschur
03-24-2004, 10:22 AM
Hi all,
As you guys have been reading we have been working on porting the EVO head. We put the head on last week and just got around to putting the car back on the dyno yesterday.
The car has our BR440 (previously called our BR475) on it. This is the same turbo that was on the car for the last dyno sessions we did. Other notable parts on the car that haven't changed. The shortblock is still bone stock and the same fuel is still in the tank from before (race gas).
The turbo is just maxed out at this point. As I have pointed out in previous posts this turbo was built to replace the overpriced Mitsubishi TDO5H 20G turbos we have run and had such great luck with over the last 15 years. The most HP I have ever seen from a 20G is 446 whp. This car (446 whp) had NO accessory belts other than an alternator and waterpump. Fully built shortblock, ported head, cams etc. In comparison the EVO still has all the accessory belts (A/C, power steering, waterpump, alternator) all intact and a stock shortblock.
The EVO with the stock head and the same turbo/fuel in it made 423 whp and 384 ft lbs of torque. We have since changed to our ported cylinder head and yesterday the car made 443.2 whp and 405.2 ft lbs. The car just won't maintain high boost to redline with this relatively small turbo. The boost at 7800 rpm when we stopped the run dropped to 21 psi. This is the same boost levels at the top of the pull we were seeing before the head.
Looks as though we gained a solid 20 hp and 21 ft lbs of torque.
Here are some interesting specs on this turbo. First, it is not ball bearing and is not water cooled. This is going to be the basic kit we offer for the EVO as it offer great spool up and a good power increase over the stock unit.
Looking at the datalog from the run the throttle was put to 100% at 3430 rpm, at 4059 rpm the car had 20 psi of boost. So in 629 rpm it went from 0 psi to 20 psi. In time the car went from 23.08 to 24.56, that is 1.48 seconds from 0 boost to 20 psi.
Something else that I personally found absolutely amazing was the intake temperatures. The runs we were doing we started at 77 degrees intake tempuratures. The runs at the end of the pulls varied from an increase of 3 to 9 degrees.
77 F to 80 F
77 F to 86 F
71 F to 77 F
That is some impressive stuff.
Next on our list is to start testing some more serious turbos. I have a couple being built right now. We should be back on the dyno next week with some new numbers.
I can't wait until the track opens!
David Buschur
www.buschurracing.com
As you guys have been reading we have been working on porting the EVO head. We put the head on last week and just got around to putting the car back on the dyno yesterday.
The car has our BR440 (previously called our BR475) on it. This is the same turbo that was on the car for the last dyno sessions we did. Other notable parts on the car that haven't changed. The shortblock is still bone stock and the same fuel is still in the tank from before (race gas).
The turbo is just maxed out at this point. As I have pointed out in previous posts this turbo was built to replace the overpriced Mitsubishi TDO5H 20G turbos we have run and had such great luck with over the last 15 years. The most HP I have ever seen from a 20G is 446 whp. This car (446 whp) had NO accessory belts other than an alternator and waterpump. Fully built shortblock, ported head, cams etc. In comparison the EVO still has all the accessory belts (A/C, power steering, waterpump, alternator) all intact and a stock shortblock.
The EVO with the stock head and the same turbo/fuel in it made 423 whp and 384 ft lbs of torque. We have since changed to our ported cylinder head and yesterday the car made 443.2 whp and 405.2 ft lbs. The car just won't maintain high boost to redline with this relatively small turbo. The boost at 7800 rpm when we stopped the run dropped to 21 psi. This is the same boost levels at the top of the pull we were seeing before the head.
Looks as though we gained a solid 20 hp and 21 ft lbs of torque.
Here are some interesting specs on this turbo. First, it is not ball bearing and is not water cooled. This is going to be the basic kit we offer for the EVO as it offer great spool up and a good power increase over the stock unit.
Looking at the datalog from the run the throttle was put to 100% at 3430 rpm, at 4059 rpm the car had 20 psi of boost. So in 629 rpm it went from 0 psi to 20 psi. In time the car went from 23.08 to 24.56, that is 1.48 seconds from 0 boost to 20 psi.
Something else that I personally found absolutely amazing was the intake temperatures. The runs we were doing we started at 77 degrees intake tempuratures. The runs at the end of the pulls varied from an increase of 3 to 9 degrees.
77 F to 80 F
77 F to 86 F
71 F to 77 F
That is some impressive stuff.
Next on our list is to start testing some more serious turbos. I have a couple being built right now. We should be back on the dyno next week with some new numbers.
I can't wait until the track opens!
David Buschur
www.buschurracing.com