Am I the only one here who has heard of Claimer rules in dirt track? People build cheap or stock engines because another racer can "claim" their engine at a very low price.

I agree with almost everything that Hugh writes. When you reach critical flow (i.e. supersonic), backpressure will not affect flow. BUT, flow is only critical when the exhaust valve first opens (as he states). Later in the exhaust stroke (after the high cylinder pressures have "blown down") flow is no longer critical, so backpressure limits the exhaust flow from the cylinder.

And to bring in my own expert, David Vizard writes:

". . . take a typical situation where, under full throttle conditions, exhaust backpressure is twice the intake pressure."

"For a turbo engine boosted at 10 psi, the exhaust pressure when that much boost exists is going to be about 20 psi."

"It is possible with enough development to get the intake-to-exhaust pressure ratios near unity. . ."

The article is actually about turbo camshaft selection so I had to pull out bits and pieces. It is published in "How to Build and Modify Chevrolet Small-Block Camshafts and ValveTrains".


I never said that anyone was a liar. Only that there may be some things at work here that people don't realize. For instance, my friend traded in a "stock" '99 Trans Am to a dealer. Even though the car looked and sounded completely stock, it had an MTI 221/221 cam in it. Someone will buy this car and, mod for mod, it will always make 30 more hp than everyone elses. I'm sure he's swearing to everyone that "it only has bolt on's".

Also, Turbospeed mentioned that he had race gas in it. I know that certain race fuels have very high energy (Btu/lbm) as compared to regular C12 or C16. These fuels can be worth as much as 10% more power than ordinary race fuel. That would bring down the 460 rwhp to a more believable 420.

There are a hundred such possibilities that could be at work. That doesn't make anyone a liar, but it makes things more believable.

Mike

 

agreed!

 

gothp-
well, your statement is very broad, of course a properly matched exhaust turbine will help with exhaust backpressure.

 

In your dreams dood! The turbo would have to be so big, it would be impratical to mount it to the exhaust. Even if it was big enough to mount to the exhaust, it would probably melt do to the extreme exhaust temperatures of very high horsepower and nitromethane fuel.

 

you'd need 2 actually.....Garrett makes a 140mm wheel capable of about 3000hp. Use 2 and you're in Top fuel territory

obviously we'll never know cuz they were banned years ago and no one is going to develop them with money out of their pocket "for fun"

 

I would go back into your other post, but I would have tooooo much to correct. I seems you really have No clue, and If you would read, you would see that they Have already been used in TOP FUEL.

Also what centrifugal or roots blown cars do you know winning in PRO 5.0 or PRO STREET. As far as TOP FUEL, like we said the cars are already TOOO D...... fast as it is . And they have been doing things to slow them down, or keep them SANE for the last few years. So why would they want a turbo. From what i hear , when turbos were used in TOP FUEL, they were supreme.

 

Every time I come to catch up on this thread, I feel like I've just sat thru a physics lecture with two duelling professors

 

I think for the street a supercharger is better since less boost is at lower rpms giving you less wheelspin than a turbo... The supercharger is more progressive and you can get more horsepower where you need it (the few 600rpms that you are always shifting in)

Back to the original topic...

I think there has to be some kind of forged pistons in order not to break...

But one thing i believe and it is that without detonation it would take awhile for the stock pistons to break... if a lot of race gas was used and that full 11psi where at work, well.. definetly it is worth it.. .and you had a very generoud dyno, because with all the mods I got, I only managed 392 with 4.5 psi...

The thing is that it is not impossible, but very unlickely.. I think the point here was the dyno.. It gave you some generous numbers, althought the mph do add up to those HP numbers...

But I would love to see more test of your setup so I can start saving money for it


Anyways, the dyno I went to is known here to give very low numbers, so maybe that is why I got them so low.

 

Wasn't this locked earlier

Russ, Tom, please lock it again


I think it's possible, but the thing has to be tuned - GNAT'S *** perfect. 128 mph is impressive to say the least.

I was just pissed off that he came on here posting about how fast it was, but didn't want to share info. I posted literally hundreds of pictures of my twin kit last year when I was putting it together. I guess we have different goals= I was here to help, he's here to sell. LOL

best o'luck!
...Brady

 

Brady. I agree.

When I post the results of my setup, I tell everything about the combination, and try to help everyone out the best I can when they have questions about their buildups.

I'm switching to turbos myself, and I'm sure I'll need some help from other people who have allready done so.


I really think that when Turbospeed posted his dyno and track times, he knew that this thread was going to be flame bait, because he never had any intentions of going into detail about his setup, or helping anyone else out with theirs.

Most people on this messageboard are here to help each other and to learn from it.

Most vendors would not give results on a kit they weren't ready to produce, or at least give some information on.

JMHO

 

Totally true!!!

 

I guess I didn't expect this thread to be flame bait because I few of the boards I spend time on have so many flamers. I posted the results of my testing, did not promise any more, any less. I've responded to several individuals who have emailed me asking for help or advice on their own turbo kits.

You flamer types love playing the "this board is a here to help board" card alot. Holding you to your own reasoning, what/who are you helping by flaming me all the time. Changing Doc Holiday's quote slightly... "Your hypocracy knows no bounds".

So far this thread has went from "here is the latest results from my car", to "I want to know every detail of your kit including pictures, specifications, date of birth, mother's madien name, shoe size, and pets name", to "I bet it doesn't even exist", to "That's impossible on an internally stock LT1, and you can't prove it - UNLESS you post pics of the car sitting stationary on a lift somewhere", and now has come full circle again.

Brady, based on your comments, I'm guessing you have never been self employed. However, I am glad what ever company you work for can survive while giving it's competition the bread and butter of it's product/market. I would think they don't because if they did, it might be hard for them to pay you the salary that financed that turbo car you built.

INTMD8, Since you seem to follow the lead of every new person that flames me in this thread, here again is a perfectly reasonable response. Most companies do infact drop hints here and there about upcoming products. The maker of your favorite car does it. Hell, Mazda is running an ad campain for their new 6 whatever that gives/shows almost no details other than to let you know what is on the horizon. What do you think all the concept car shows are about?? Ferrari was dropping cues, hints, and tidbits into the world about it's new F60 for over a year now.

I can't understand why it is so hard for some of you to grasp this concept other than you hope to flame me into telling you how to build my kit. Welp, sorry, it's not going to happen. I'll post details when I am good, well, and ready and not before. As I have said before, I'm happy to help people work through the problems on their own designs but I'm not going to give you a play by play build sheet on mine.

 

Mazda is a company that produces cars and has done so for many years.

If an individual came on this board and said.

"Hi, I've never made a car before, but I just made one and it has superior performance compared to anything like it"

But then went on to say that he didn't know when or if he was going to produce it, couldn't go into detail about it, and couldn't show any pictures of it.

What would you think?

This board IS here to help, and learn.

And no, I'm not helping anyone out in this thread, but I'm not the one that posted results to a "secret" setup.

If anyone ever has any questions, I'll gladly help them the best I can.

 

What does Mazda's being a large company in business for years of to do with anything? They are protecting their product, why can't I. I love how you guys call me a vendor when it's convienent and an individual when it's not! The flamers also tend to ignore the number of times I've offered AND given help to other people. Since when does it only qualify as help when you are detailing exactly what you have done to your car? I've held far truer to the said nature of this board than any of you thus far in that not only have I taken the time to answer questions and offer advice, I've taken the time to respond to all these pointless flames. The justification that it's not a waste of my time is based on what those who have supported me here have said both here and in email. Let me ask you something... What if you could buy a product that does what I say it can for around 3500 dollars, maybe less?

All good though, this has been a burning weekend. Not only have I gotten flamed for my cars results, I got flamed for eating the most habinaro flavored wings and wings soked in Dave's insanity sauce for 2 days. Though the flaming was a little different in nature!

 

All I was saying is that Mazda is an established company, and if they are showing pictures of their car driving down the road, it's within reason to think that the car is what it claims to be and will be able to be purchased shortly.

If you had a commercial of your LT1 turbo kit and you drove your 30th past the camera smoking the tires and the blowoff valve popping on the shifts, I would think the same of your setup


"What if you could buy a product that does what I say it can for around 3500 dollars, maybe less?"

I think that would kick ***. Maybe if I had a shred of information about your kit I would hold off on buying Charged Air Systems setup.


Lets just say theoretically, you said-

It's a single turbo kit with a front mount intercooler,stepped log type stainless manifold, passenger side header, 2.5in crossover tube and 3 inch downpipe.

Or if you said-

It's a single turbo kit with tuned length 1- 3/4 drivers side header, 1-3/4 passenger side header with 2.75 crossover pipe, 4 inch downpipe and dual (ati style) intercoolers.


What I'm getting at is you can give a general description of the kit to generate some interest, with no chances of anyone else copying your idea.