As probably some of you may know, David Buschur of Buschur Racing recently acquired his own bone stock supra with the intent of using it as a base for checking out mods that he intends to fabricate and sell for the supra. He did a real nice writeup on his dyno results for intake/exhaust changes. It's nice to see someone systematically comparing the options. Here is his message to the MKVI list. I'd say just dropping in a K&N filter and an exhaust pipe for a net gain of 65 rwhp is pretty impressive, especially since it was only about 7% less than just an open intake and pipe! If I did any mods to my red supra, it would be no more than that.
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Hi guys,
I posted once before to you guys. My name is David Buschur and I am the president of Buschur Racing, Inc. We have specialized in the Mitsubishi Eclipse, Talon, Laser and Galant VR-4's for over 11 years. We just recently moved into the Supra market.
I really want to supply you guys with parts and we will do what it takes to get your business. Since my last post we have had a few guys call and we appreciate the shot at your business.
We just finished our exhaust for the cars this weekend. The car I bought is a 1994 TT auto. The car has 72,000 miles on it and is bone stock. We took a different approach to the exhaust system. Everyone else is offering an exhaust that starts at the back of the second cat and then goes to the muffler. We have made our cat back eliminate the second cat and bolt to the bottom of the front cat. So our complete system consists of a short down pipe to eliminate the front cat and then the cat back. The entire system is 3.5" mandrel bent stainless and we use a straight through stainless steel muffler with a four inch polished stainless steel tip. The tip runs straight out the back of the car so it looks like it is suppose to. The prototype is at the bender now being reproduced. It says it will be about 2 weeks for the production pieces. The entire system, all done in 304 stainless steel and mandrel bent should run no more than $900.
We dyno'd the car bone stock before starting all the mods we are going to do. My car made a peak of 273.1 HP at 5700 rpm at 6700 it was down to 242 hp.
We wanted to try a few things as we went along so the next run we made we did it with completely open exhaust, no cats, no exhuast tubing, just a short dump off the turbo. The car still had the stock complete airbox and aircleaner installed, factory boost levels, no boost control.
The HP jumped to 303.1 peak at 5800 rpm and at 6700 was down to 290 hp. So a gain of 30 peak hp and 48 hp at "redline".
Next we completely removed the aircleaner, the car picked up another, you aren't going to believe this, 40.6 hp. I couldn't freaking believe that so I put it back in and it lost the same amount.
I made up a quick and easy to install adapter and installed an open element K&N. The car gained more HP than running without the aircleaner. It gained another 2 hp. The peak HP was now up to 345.7 at 5900 rpm and still had 331 HP at 6700. The curve on the dyno was really nice, smoother than without the aircleaner. I have now made up a few of these for resale. It includes the clamps, adapter and the aircleaner, cost is $95. It completely eliminates the factory airbox and intake on top of the radiator.
Now, last but not least we put on our full 3.5" exhaust. As I said it runs from the bottom of the turbo to the tip. The car did loose HP, but of course you don't want to drive around without an exhaust and boost creep was definetly worse before the exhaust went back on. The car still made 338.3 HP at 5700 rpm, that's only 7.4 hp less than a dump off the back of the turbo. The exhaust at idle has a ton of base. I thought at first it was going to be too loud and I was going to re-do it. I was wrong. This is one of the sweetest things I have ever heard. Cruising at 60 mph you can hardly tell the difference from stock, at WOT it's nothing but sweet.
As far as quality goes we will have the best you can get, as far as pricing, I think at $900 for a complete mandrel bent stainless exhaust goes there isn't anything else even close.
Someone just posted about the cams for the Supra and a group buy. I checked into it and anyone interested in the Crower equivalent to the 264/272 HKS combination we can do them for you for the same $660, no minimum, just call and order them. Crower suggest changing the springs too with those cams. If you need them we can do the Crower springs for $150 a set and if you want titanium retainers we can give you the set at $210.
Thanks alot, hope the information I provide proves helpful.
David Buschur
Buschur Racing, Inc.
If you call please go to extension 1 for sales and ask for Tym.
----------------------------
Hi guys,
I posted once before to you guys. My name is David Buschur and I am the president of Buschur Racing, Inc. We have specialized in the Mitsubishi Eclipse, Talon, Laser and Galant VR-4's for over 11 years. We just recently moved into the Supra market.
I really want to supply you guys with parts and we will do what it takes to get your business. Since my last post we have had a few guys call and we appreciate the shot at your business.
We just finished our exhaust for the cars this weekend. The car I bought is a 1994 TT auto. The car has 72,000 miles on it and is bone stock. We took a different approach to the exhaust system. Everyone else is offering an exhaust that starts at the back of the second cat and then goes to the muffler. We have made our cat back eliminate the second cat and bolt to the bottom of the front cat. So our complete system consists of a short down pipe to eliminate the front cat and then the cat back. The entire system is 3.5" mandrel bent stainless and we use a straight through stainless steel muffler with a four inch polished stainless steel tip. The tip runs straight out the back of the car so it looks like it is suppose to. The prototype is at the bender now being reproduced. It says it will be about 2 weeks for the production pieces. The entire system, all done in 304 stainless steel and mandrel bent should run no more than $900.
We dyno'd the car bone stock before starting all the mods we are going to do. My car made a peak of 273.1 HP at 5700 rpm at 6700 it was down to 242 hp.
We wanted to try a few things as we went along so the next run we made we did it with completely open exhaust, no cats, no exhuast tubing, just a short dump off the turbo. The car still had the stock complete airbox and aircleaner installed, factory boost levels, no boost control.
The HP jumped to 303.1 peak at 5800 rpm and at 6700 was down to 290 hp. So a gain of 30 peak hp and 48 hp at "redline".
Next we completely removed the aircleaner, the car picked up another, you aren't going to believe this, 40.6 hp. I couldn't freaking believe that so I put it back in and it lost the same amount.
I made up a quick and easy to install adapter and installed an open element K&N. The car gained more HP than running without the aircleaner. It gained another 2 hp. The peak HP was now up to 345.7 at 5900 rpm and still had 331 HP at 6700. The curve on the dyno was really nice, smoother than without the aircleaner. I have now made up a few of these for resale. It includes the clamps, adapter and the aircleaner, cost is $95. It completely eliminates the factory airbox and intake on top of the radiator.
Now, last but not least we put on our full 3.5" exhaust. As I said it runs from the bottom of the turbo to the tip. The car did loose HP, but of course you don't want to drive around without an exhaust and boost creep was definetly worse before the exhaust went back on. The car still made 338.3 HP at 5700 rpm, that's only 7.4 hp less than a dump off the back of the turbo. The exhaust at idle has a ton of base. I thought at first it was going to be too loud and I was going to re-do it. I was wrong. This is one of the sweetest things I have ever heard. Cruising at 60 mph you can hardly tell the difference from stock, at WOT it's nothing but sweet.
As far as quality goes we will have the best you can get, as far as pricing, I think at $900 for a complete mandrel bent stainless exhaust goes there isn't anything else even close.
Someone just posted about the cams for the Supra and a group buy. I checked into it and anyone interested in the Crower equivalent to the 264/272 HKS combination we can do them for you for the same $660, no minimum, just call and order them. Crower suggest changing the springs too with those cams. If you need them we can do the Crower springs for $150 a set and if you want titanium retainers we can give you the set at $210.
Thanks alot, hope the information I provide proves helpful.
David Buschur
Buschur Racing, Inc.
If you call please go to extension 1 for sales and ask for Tym.
