moved the carb back abit - Page 2 - Suzuki Z400 Forum : Z400 Forums
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post #16 of 29 (permalink) Old 04-25-2014, 02:23 AM
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Originally Posted by liftedhigh View Post
Adding runner length is all this mod is doing. Adding length to the runner moves the power band up giving more high rpm power but you will lose low end power. The intake boot and filter do nothing except allow more air to flow into the carb. It does not move the power band
Actually lengthening the runner lowers the effective points in the powerband. You've got it backwards.

Your statement about the boot doing nothing is incorrect. The boot is part of the runner, and changing it's length affects the powerband. I've done this for fine tuning for 6 or 7 years now. Changing it by an inch or two has a surprising affect.
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post #17 of 29 (permalink) Old 04-25-2014, 03:17 AM
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On a bigger engine that is true due to them being long runner/large port but on a small engine with small port/long runner power band is moved up. The longer runner does help low end only by allowing more time for the air to sort making low rpm more efficient.

I was talking about the boot from the box to the carb. Nothing before the carb moves the powerband unless its forced induction.

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post #18 of 29 (permalink) Old 04-25-2014, 07:17 AM Thread Starter
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Originally Posted by liftedhigh View Post
.

I was talking about the boot from the box to the carb. Nothing before the carb moves the powerband unless its forced induction.
i'm going to disagree with you . I know of experiments that mixxer has done that has increased HP by shortening the b4 carb intake boot.
I don't remember what intake he was using but removing one inch from it was better HP

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post #19 of 29 (permalink) Old 04-25-2014, 10:28 AM
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If he improved the airflow it will raise HP but will NOT move the powerband in any way.

04 LTZ 400, 440 BBK 13.5:1, ported head, weisco valves, stage 2 hotcams, fcr39 opened to 41, FMF power bomb, Lexx MXE slip on, 400ex boot with K&N, Dynatek CDI, Full Flight +2+1 A arms, YFZ450 front calpers, steel braided brake lines, blob delete, DR D reverse, ASV levers, powermadd hand guards
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post #20 of 29 (permalink) Old 04-25-2014, 10:38 AM
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Originally Posted by liftedhigh View Post
On a low engine that is true due to them being long runner/large port but on a small engine with small port/long runner power band is moved up. The longer runner does help low end only by allowing more time for the air to sort making low rpm more efficient.

I was talking about the boot from the box to the carb. Nothing before the carb moves the powerband unless its forced induction.

Been building and tuning 1000hp-3000hp drag engines for the last 20 years
This is not a V8. The runner length does not stop at the carb. Its also not as simple as more low end or more top end. You might want to research the physics a bit.

The intake length is all about harmonic waves. At certain points of the rpm range, they're in tune and they help you. At certain points of the rpm range they are out of tune and they don't help.

Changing the length changes the rpm range where those come into effect. You can see these effects in my dyno sheet from 2011. We tried several different intakes before the carb, and the runs reflect what was going on inside.

If you want it in V8 terms, this is like the velocity stack system. Different length stacks have different effects and you tune it to what the engine likes. With those, its a little more like you describe where you can trade low end for high end, because they don't have such a wide span of useable rpm range like we do.
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post #21 of 29 (permalink) Old 04-25-2014, 11:02 AM
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post #22 of 29 (permalink) Old 04-25-2014, 11:31 AM
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I don't know if I like that dimpled piston and head thing that you do
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post #23 of 29 (permalink) Old 04-25-2014, 11:56 AM
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I don't know if I like that dimpled piston and head thing that you do
The hole is for more flow.

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post #24 of 29 (permalink) Old 04-25-2014, 01:18 PM Thread Starter
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Originally Posted by liftedhigh View Post
If he improved the airflow it will raise HP but will NOT move the powerband in any way.
And what's wrong with improving the horsepower? sarcasm

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post #25 of 29 (permalink) Old 04-25-2014, 01:22 PM Thread Starter
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I too have experimented With different b4 intake boots the difference is amazing

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post #26 of 29 (permalink) Old 04-25-2014, 06:18 PM
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Very interesting read!

I would like to see if it does make a difference. Doubt if it would be an option for me anyway as the rat stack/ bell housing thing will not allow much if any movement.

Wont be long before people are chopping the rear shock mount up to free up some space....

Free power is the best kind though in my opinion. Hope it works!

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post #27 of 29 (permalink) Old 04-25-2014, 06:45 PM Thread Starter
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Very interesting read!

I would like to see if it does make a difference. Doubt if it would be an option for me anyway as the rat stack/ bell housing thing will not allow much if any movement.

Wont be long before people are chopping the rear shock mount up to free up some space....

Free power is the best kind though in my opinion. Hope it works!
if you ditch that EX boot for a 04 trx450r boot or even a ds650 boot (shortened) you can pick up some HP

The White Beast
03 ltz400,95.5bore,+5crank,P&P,13.7:1,JE piston,spacer plate,RHC +1 intakes valves,RHC #208in&187ex cams,DRZ manual decomp,DID cam chain,no air box,Sredrum TB 42mm FCR,RAT stack,WB fuel screw,EMN needle,quick shot,06 clutch 450r drive plates w/trx400 ex springs,C2HB,ex thumber,trx450r air boot, Barker Performance pipe, trailteck flywheel,dynatek,NOLOGY HOTWIRES ,nerf bars,450r shocks, +4 swinger,lowered front & rear
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post #28 of 29 (permalink) Old 04-25-2014, 07:17 PM
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Originally Posted by cataway View Post
if you ditch that EX boot for a 04 trx450r boot or even a ds650 boot (shortened) you can pick up some HP
I had one made by samco but never thought it through properly...as usual Attachment 26954

Im finding a bit more power here and there.

"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear god, protect my ride" -Amen...
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Last edited by markyc; 07-29-2014 at 06:47 PM.
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post #29 of 29 (permalink) Old 05-14-2014, 09:53 PM Thread Starter
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Originally Posted by spize909 View Post
Did you remake your transition piece inside the intake?
the spacer . I made it to taper on its inside ,because the carb bore is abit bigger than the head.




I also installed the power jet

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