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My research shows me that barrel throttles are better for airflow above 15k rpm and below that butterflies do better . Slides don't offer the smooth part throttle drivability that butterflies will.

Wondered about that. Guess we'll find out.

You can't compare them. They definitely aren't the same. They have two different efficency zones and applications.

I agree, using an electronic solenoid for boost control is the way to fly. To hell with this vaccum accuated signal garbage. If your wastegate doesn't crack until boost pressure reaches the set level things are mo' better. Plus with a solenoid you can do cool stuff like PWM that sucker and...

I did not mean to imply that I would figure out how to run a clutch on the factory flex plate. I meant using a button. Like this: http://www.tiltonracing.com/incs/imagethumb.php?picture=d0023 Then bolt that to the crankshaft. The clutch would have its own dedicated flywheel, but the...

Those are some pretty impressive head flow numbers. Have you found a problem with the end ports on the intakes. It looks like that retarded offset would dramatically affect airflow in those cylinders. What are you doing for starter and ring gear, is it integrated into your chromoly flywheel...

I know what Garrett claims. I am also familiar with guys using pretty sizable turbos on a street car and claiming the ball bearings as the reason why. But no one has done a true objective back to back test. I have no doubt that ball bearings can be better. ALthough this could go into the...

The T25 is a small nonballbearing turbo. It originally came on the 2nd Gen Eclipse and Talons. Not a good choice for a performance turbo. ONe reason OEMs will not use them is cost. The cost can't be offset. But look at it this way. Porsche has a phenomenal product. It is very good at what...

Ball bearing turbos are not rebuildable. Production manufactures will not use them because of durability issues. I personally would like to take a ball bearing center housing and put a T3 turbine in it and a T4 compressor wheel and run it, then take all the guts and swap them into a non...

Yeah I saw the hole in the block. To the mock up table is where all dead parts go. Look at how long the headers are . Good for low end torque.

I forgot where did you get that picture?

It looks like a Daytona Prototype engine. They look like flat slides. I am guessing they are using it as a mock up to build the headers. Whats up with the valve covers? They look like some custom numbers.

Why did one of your turbos not make boost? Why not just hook up a gauge to each one?

The biggest thing with twins versus singles is the boost "hit". Singles will hit harder at one time than to twins. Look at the Porsche 934 and 935. One had a big single and a the other had two smaller twins. The 935 is much easier to drive becuase the "hit" is much smoother. For a street...

Yeah I am moving really slow on my race car. I think I am going to pull the lexus motor off the frame jig and put it on a stand. May look at pulling the heads off. May not. I need to get back on this car. Finished a couple of customer projects and should be able to get back to it.

I have seen too many problems with piggy backs. For instance did you know that a Honda will throw timing if it sees a very rich mixture, such as the one created with an SMC, SAFC, or VAFC? The engine is confused because the piggy hack is faking out sensor readings. This little issue has...

You will need to buy: Hose clamps for intercooler piping and water lines Oil drain lines and AN fittings 3AN oil pressure line for the turbo Air filter O2 sensor bungs to weld into exhaust system Aluminum sheet to make heat sheilds out of turbo manifolds Fitting to weld into drain pan Injectors...

POrsche uses an electronic controller made by Semiens to control the vane angle. It does not use oil pressure. The drawback to oil pressure is you can't get sufficent pressure at low rpm. With independent electronic control you can tweak the blades at idle if you set it up that way.

I know the LE-1 groundfighter used a supercharged Lexus engine putting out 2000HP. I was looking for the two articles that I found when I first picked up this engine, but couldn't find the links. There was a couple of teams here using the 1UZ in drag racing that were in the high 1000s low 2Ks...

They haven't run cast iron blocks in Top Fuel and Funny cars in the last 30 years. Most are running Forged aluminum blocks and they are making closer to 8500HP. My main question was why mess with the cast iron block. OUr stock aluminum blocks and cranks will take 2000hp without any trouble...