SUs Vs Tripple webers

[xray]

There is a member on this web site that turns in the 12s with his 240 running SUs and street tires.

Here's his post from zcar.com.

http://www.zcar.com/forums/read.php?f=1&i=658262&t=658151#reply_658262

As you can see, changing your carbs/cam is only a part of a bigger puzzle. Each change necessitates alterations further down the line, and to just "add triples" or "get a more aggressive cam" is really going to increase the speed with which you and your money are separated without the concomitant improved performance....

[jmortensen]

Here's his post from zcar.com.

http://www.zcar.com/forums/read.php?f=1&i=658262&t=658151#reply_658262

As you can see, changing your carbs/cam is only a part of a bigger puzzle. Each change necessitates alterations further down the line, and to just "add triples" or "get a more aggressive cam" is really going to increase the speed with which you and your money are separated without the concomitant improved performance....

While its true that Norm wasn't just running a stock engine with SU's to get his 12's I don't think that has much bearing on the value of the camshaft by itself. An engine functions best when the parts used match each other, this is true. Triples and stock compression with a big cam are not optimal. NOT OPTIMAL. That does NOT mean that by themselves they aren't an improvement over stock performance.

I've provided a link to a video of my Z with 8.5:1 compression, the .490/280 cam, 44 Mikunis, 2.5" exhaust. This is a "bad" combo because the compression is generally considered too low for all of the rest of it. Sure the engine makes MORE power with the 11:1 compression and the improved porting it has now, but that engine was for all intensive purposes pretty comparable to your standard L28E as far as the longblock was concerned. You tell me if it doesn't seem like an improvement over stock. And I can say that the thing that made the biggest improvement in power was the triples. Going from the SU's to triples was amazing. Then I tuned them!!! This video was shot about a week after I put the carbs on, and they weren't tuned for crap FWIW.

http://videos.streetfire.net/search/autox/0/3B512F0F-8AD1-4DAB-BD8E-0AE1768FB642.htm

I see so many people buying cams that are too small that it drives me crazy. I have yet to see the post saying "I bought a cam that is too large for my SU'd or triple carbed Z" on a Z car website, yet I've seen literally hundreds of posts over the years warning not to get too large a cam. I can speculate that this attitude comes from 2 places: when the FI cars came about there must have been a bunch of people putting in cams that are too large for the crappy stock FI to handle (which isn't very big at all), and I think this is a carryover from the V8 world as well.

[Panamared]

Well after being reading these answers I have to change my mind since the E88 doesn´t have the best compression ratio. I should milling or swap to L28 Engine.

Also have some pics fromthe SUs I have. They look grrr now but if I polish them and rebuilt can bring them back to life.

Or please if someone can help me setting up a E88 for the more power I can get.

I want my car for weekends only but is for street. A powerful street lady.

Thank You.

This site is the best TONZ OF NIZE PEOPLE.

[Panamared]

Pics fromthe SUs I have. They look grrr now but if I polish them and rebuilt can bring them back to life.

[jmortensen]

I haven't been using SU's for 6 or 7 years, but those don't look right. The air cleaners look like ones I've seen on the smaller 510 SU's. And the oil caps on top look strange too. You might want to measure the opening in the manifold side of the SU and see how large they are. Someone here will know for sure but I think the stock Z car SU's are 42mm.

[xray]

delete....

[Zedrally]

John is correct is assuming that your SU's are not OEM.

Haven't a clue as to what there off, but it ain't a zed..

[beandip]

Pics fromthe SUs I have. They look grrr now but if I polish them and rebuilt can bring them back to life.

THE CARBS LOOK TOO SMALL. WHERE DID YOU FIND THESE ?

[Panamared]

I dont know they just come with the car but the car was running by the time single four barrel carb.

But i Think the answer is ZTHERAPY:love: .

Please let me know any comment bad or good.

Love ya people.

A focus of knowledge z friends.

[zguitar71]

Ztherapy carb will bring the life back to your motor. They are great carbs and the video that comes with them will educate you in every way in relation to the SU's. You might not get the power potential of tripples but they are less than 1/2 the $ and you can get a lot of power from them. I would stay away from the SM needles unless you have a larger cam and head work done, they run too rich on the higher rpms.