Question about supercharger with longtubes? - Ford Mustang Forum
 
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post #1 of 11 (permalink) Old 02-25-2010 Thread Starter
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Question about supercharger with longtubes?

Is it better to just leave your stock manifolds with a supercharger or get longtubes? I know i will need to have it re-tuned with them but will it be worth the boost loss with the LT headers?


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post #2 of 11 (permalink) Old 02-25-2010
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Wow this is a well hashed out discussion, you might look at the search to see prior takes on this...I have long tubes with my kenne bell, there is no loss of boost, I work under the old addage of "more air in means more air out" long tubes clearly move the air out more efficiently, not to mention they sound awesome.

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post #3 of 11 (permalink) Old 02-25-2010
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Your just making the exhaust more efficient and still making the same power or more with say...13psi instead of 14psi. You'll be fine either either route.

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post #4 of 11 (permalink) Old 02-25-2010
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Boy this is going to be good!

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post #5 of 11 (permalink) Old 02-25-2010 Thread Starter
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Ok what if i decided to put LT's on and wanted to go from a 3.8 to a 3.6 pulley would that be ok as well?

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post #6 of 11 (permalink) Old 02-25-2010
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I don't see why not. Going from stock 5-6psi to about 8psi, as long as you have a great tune and the internals can handle it, should be fine.
So....no comment KDT since you have an E-Force on your car??:yelpleased:

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post #7 of 11 (permalink) Old 02-25-2010
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Quote:
So....no comment KDT since you have an E-Force on your car??
I knew I would get drug into this! LOL. I believe they benefit a NA car more than one with FI. When I was NA, I could not have gotten to 328rwhp without them. However, since adding a supercharger I believe the advantage they give decreases somewhat. I think the supercharger pushes the exhaust out negating the scavenging affect created by the long tubes. I'm not saying they are not worth it on a car with FI but they aren't going to help like they will on a NA car. My tuner did tell me that the cylinders will run a tad cooler on a FI car if it has LTs. He says that helps prevent detonation. I am not claiming this as fact though. I would definitely still buy them again even if I was already supercharged. They sound great and certainly aid in efficiency. I feel they are worth an average of 10rwhp on a FI car and around 20 on a NA car. I don't have evidence to prove this but I have figured this out from looking at numerous dyno graphs.

:yelpleased:

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Quote:
Originally Posted by SheizaSoSay View Post
That link brings back memories of yet another educational moment from sqidd.


Yeah, I'm surprised he hasn't chimed in yet.

...

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It all comes down to your pushing more air in and you need to get it out. So if your trying to push water through a 1" hose and have a 1/2" hose hooked to it you are going to only get 1/2" of water out of it, and boost is a measure of restriction you will see how you will have more boost.
Now if you have a 1" connected to another 1'' you will have less pressure or boost but better water flow.

It all comes down to Volume of air you push into the engine. The more you put in you need to get rid of it so LT headers help what you put in to get out.

If you look here on the Whipple Supercharge web page you will see the chart that lists the different SCs and in the second line you will see the SCs are rated by Liters (volume).
http://www.whipplesuperchargers.com/...sp?ProdID=1162


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