Some KB #'s @ 9lbs boost

mattstang4.6 · Jun 19, 2004

Just came back from JDM and I finally got to see some real results from my engine build up with the 9lb KB blower. JDM set up the car with a break-in tune at 9lbs of boost and dynoed at 440 rwhp. After the engine has fully broken in JDM will up the boost to 14lbs and hopefully get about 500rwhp...not bad,huh. I thought I could run 20lbs but JDM doesnt suggest running that kind of boost through the twin screw...damn. I am told the motor in my car can handle 950 hp at the crank so I guess with a safe 500hp to the wheels I wont have to worry about breaking the motor again. Anyone know whether KB plans on making the 2V twin screw in a 2.2L or possibly larger?

Dan_Soprano · Jun 19, 2004

mattstang4.6 said:
Just came back from JDM and I finally got to see some real results from my engine build up with the 9lb KB blower. JDM set up the car with a break-in tune at 9lbs of boost and dynoed at 440 rwhp. After the engine has fully broken in JDM will up the boost to 14lbs and hopefully get about 500rwhp...not bad,huh. I thought I could run 20lbs but JDM doesnt suggest running that kind of boost through the twin screw...damn. I am told the motor in my car can handle 950 hp at the crank so I guess with a safe 500hp to the wheels I wont have to worry about breaking the motor again. Anyone know whether KB plans on making the 2V twin screw in a 2.2L or possibly larger?

yes. they are currently working on a 2.2L race blower for the 2valve 4.6.

Screwed2V · Jun 19, 2004

They say they're working on it but the word I got is that their test motor puked and had to be sent back to the builder so with that and with the 99-01 cobra kits being held up due to one part the 2.2 is kind of in limbo right now. I'm waiting on it too.

DeadLurker · Jun 19, 2004

Matt,

when you up the boost to 14lbs...will you be on 93 or 100 octane?

TARZAN · Jun 19, 2004

Those are some nice #'s man. Do you not think that you could find more than 500 with a 5 PSI increase? If you got 440 at 9, I could see a lil more than 500 IMHO.

Best of luck man

-Will

mattstang4.6 · Jun 19, 2004

With the 14lb pulley it will be tuned running on 93 octane. It will be really tough to reach 500 rwhp with the 14lb pulley but JDM will try to get as close to it as possible without having to use race fuel. Maybe I will turbocharge it next year...jk. Before the engine blew I had a saleen II @12lbs of boost with 343rwhp so with only 2lbs more with the KB I will be more than happy with 480-500 rwhp. Jim from JDM took me for a ride in the car today and the thrust of the KB is awesome...night and day compared to the saleen II sc. Do not get me wrong the Saleen II sc was a lot of fun but the KB is a blast to hear when building boost.

Matt

2001Saleen181 · Jun 19, 2004

What was your set up from JDM if I might ask? Did you reduce your compression ratio, did you change your cams?

I have Tim at T&J doing my motor now. I'm having my compression reduced to 9-1 so I can up the boost safely and he is changing the cams. Should be around 450-500 at 12psi.

By the way, 1 psi="about" 12RWHP extra. So 5 more psi should get you another 60RWHP. Becareful with your intake temp. Tim says that the temperature shoots up drastically after 12 psi. This pertains to the KB kit. I'm not sure what it does to other units.

mattstang4.6 · Jun 19, 2004

JDM built me a motor with a cobra crank, manley rods and probe pistons with 8.5-1 compression using 5.4 lightning heads(better flow) with custom billet cams(i am not sure of the specs) The idle is pretty lumpy...sounds awesome. I also have Kooks JDM LT headers so I will probably only be at about 12-13lbs with the 14lb pulley. Anything near 500rwhp and I will be happy. It feels good just knowing the tune is safe and has a strong motor to back it up.

GinoGT · Jun 20, 2004

5.4 L heads having better flow? They're the same heads, aren't they?

Indiana · Jun 20, 2004

Can you post a chart? I'd like to see the torque curve.

mattstang4.6 · Jun 20, 2004

According to JDM they have better flow...at least that is what I was told. I believe the lift duration is better than 4.6 heads(do not quote me on that however). I will have the car tomorrow so I am sure they will print out copies of the dyno sheet. It looks like any other KB dyno sheet...nothing new.

Matt

Indiana · Jun 20, 2004

I was interested in seeing if the LTHs did anything to shift your torque curve. I keep hearing that people lose low end tq with shorty headers, but I don't recall hearing anything about the long ones.

kirkyg · Jun 20, 2004

GinoGT said:
5.4 L heads having better flow? They're the same heads, aren't they?

Most of the DOHC heads are pretty much the same. They all bolt on the same. They do have some difference in port sizes that should change the flow. Needless to say if you have the heads p&p there all going to have about the same potential. As long as your going to have headwork done eventually there is no need to worry about which DOHC heads you have.

kirkyg

mattstang4.6 · Jun 20, 2004

I will post it as soon as I get the chart. I am more interested in seeing the dyno chart once the engine has broken in and has its final tune with the 14lb pulley. The first tune is considered very conservative by JDM.

el_kid_1 · Jun 20, 2004

mattstang4.6 said:
Just came back from JDM and I finally got to see some real results from my engine build up with the 9lb KB blower. JDM set up the car with a break-in tune at 9lbs of boost and dynoed at 440 rwhp. After the engine has fully broken in JDM will up the boost to 14lbs and hopefully get about 500rwhp...not bad,huh. I thought I could run 20lbs but JDM doesnt suggest running that kind of boost through the twin screw...damn. I am told the motor in my car can handle 950 hp at the crank so I guess with a safe 500hp to the wheels I wont have to worry about breaking the motor again. Anyone know whether KB plans on making the 2V twin screw in a 2.2L or possibly larger?

Why did your motor break? Was it with the KB blower?

Screwed2V · Jun 20, 2004

kirkyg said:
Most of the DOHC heads are pretty much the same. They all bolt on the same. They do have some difference in port sizes that should change the flow. Needless to say if you have the heads p&p there all going to have about the same potential. As long as your going to have headwork done eventually there is no need to worry about which DOHC heads you have.

kirkyg

5.4 Lightning heads=SOHC.

mattstang4.6 · Jun 20, 2004

Stock block with a saleen II blower @12lbs of boost and a bad tune from a shop in NJ(wont mention the name). The motor was a time bomb waiting to explode. The car was running very lean from the looks of the plugs...i should have known better. I wish the KB had a little more volume to it because as it turns out this blower is actually not powerful enough to really push the motor to its full potential. I hope KB designs a larger head unit and manifold replacement in the near future. Turbos kinda scare me so I really do not want to go down that road.

GinoGT · Jun 20, 2004

mattstang4.6 said:
According to JDM they have better flow...at least that is what I was told. I believe the lift duration is better than 4.6 heads(do not quote me on that however). I will have the car tomorrow so I am sure they will print out copies of the dyno sheet. It looks like any other KB dyno sheet...nothing new.

Matt

Lift duration??? That's a cam issue, not heads.

As far as I know, there are no differences in head design. Heads from either size engine will bolt right up.

mattstang4.6 · Jun 20, 2004

I am not really sure to be honest.

kirkyg · Jun 20, 2004

Screwed2V said:
5.4 Lightning heads=SOHC.

woops thought we were talking about DOHC heads...either way they should be pretty much the same.

kirkyg

Some KB #'s @ 9lbs boost

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