Kenne Bell question

RTRMustangGT · Nov 23, 2004

What kind of boost pressure can you run on a 4.6 GT with 91 octane pump gas? Will you be able to run the 14psi kit on the 91 octane? If so what kind of horsepower can you get?

Ray@VSK · Nov 23, 2004

Uhh Kenne Bell states to run nothing lower than 92.

I'm sure you could get by & all but you'll have to back you timing down so low what's the point of even having a super charger then

tomustang · Nov 23, 2004

RTRMustangGT said:
What kind of boost pressure can you run on a 4.6 GT with 91 octane pump gas? Will you be able to run the 14psi kit on the 91 octane? If so what kind of horsepower can you get?

why worry about getting higher octane if your putting on a blower?

Ray@VSK · Nov 23, 2004

Because you have to feed that air otherwise your motor will spark knock & blow up the motor, you have to retard timing to prevent detonation aswell.

tomustang · Nov 23, 2004

Ray@VSK said:
Because you have to feed that air otherwise your motor will spark knock & blow up the motor, you have to retard timing to prevent detonation aswell.

yeah i know that already. the question is for RTRMustangGT.

if KB recommends 93+ then don't put less in. simple.

back_in_black · Nov 23, 2004

I would not run over 9 lbs of boost with stock bottom end, intercooling will help.

lazerred02 · Nov 23, 2004

o3redfire said:
I would not run over 9 lbs of boost with stock bottom end, intercooling will help.

I agree 100 %, just end up costing you more $ in the end.

MT1083 · Nov 23, 2004

Ray@VSK said:
Uhh Kenne Bell states to run nothing lower than 92.

KB's chips are set to run on 91 octane. If you have access to 93-94 then you may be able to run 10# safely. Ken told me that I would be able to, but the extra power is just not worth the risk of an engine in pieces.

Laser-01-gt · Nov 23, 2004

Yes, Kenne Bell kits are designed to run on 91. Every additional 1psi need 1.5 octane. So if the 9# intercooled kit is designed for 91 then it would take 100 octane race fuel for a 14# kit. on a stock bottom end with the stock compression.

Saleen s281 · Nov 23, 2004

Laser-01-gt said:
Yes, Kenne Bell kits are designed to run on 91. Every additional 1psi need 1.5 octane. So if the 9# intercooled kit is designed for 91 then it would take 100 octane race fuel for a 14# kit. on a stock bottom end with the stock compression.[/QUOTE

93 octane 14psi 488rwhp and 502 rwtq

Blown00GTAuto · Nov 23, 2004

Saleen s281 said:
...93 octane 14psi 488rwhp and 502 rwtq

Are you seeing 14psi or is it that you are running a 14 psi pulley? With stage 3 heads, big cams, and headers you'd get substantially less actual boost pressure than with a stock long block running the same pulley. Your getting the same airflow as 14psi but with less actual (heat causing) boost pressure, so it's understandable that you can use 93 octane. I've never seen Kenne Bell claim to run 14psi on 93 octane or less on a stock longblock.

Nevertheless you've got yourself a nice setup .

Darkhorse845 · Nov 23, 2004

o3redfire said:
I would not run over 9 lbs of boost with stock bottom end, intercooling will help.

I agree don't go over 8-9 psi. on a stock
bottom end or your engine is living on barrowed time! A intercooler or
aftercooler would help prevent detonation also! I think you will be find
with 91 octane too.

Saleen s281 · Nov 23, 2004

i see 14 psi. i thought i would see less too with the ported heads but for some reason i see 14

hotmustang331 · Nov 23, 2004

Heck even 9PSI KB units are killing the stock low end...I would NOT recommend putting a KB on a 2V with stock lowend....built is the only way to go with those IMO.Then you have a killer combo. EDIT: Saleen S281, your trap is kinda low for all that work...maybe it isnt, but it seems you should be well over 120 with all that power.Traction problems?

Venom_Nitrous · Nov 23, 2004

Hopefully I don't hijak this, but doesn't it kind of depend on where you live as to the octane requirement. I live kind of at a high elevation and premium here is only 1 point higher than the regular gas I buy at my parents place which is at alot lower elevation. Premium there is like 3-4 points higher.

Saleen s281 · Nov 24, 2004

i thought 117 was kinda low myself. theres no traction problem i got bfg drag radials. im not sure if im shifting to early or to late. i shift at 6100 rpm. if i post up my dyno sheet would you be able to find out where i should be shifting?

Ibeyorsuperman · Nov 24, 2004

I ran my GT with stock internals on 12psi on 91 octane.. the KB tune is pretty good

el_kid_1 · Nov 24, 2004

Ibeyorsuperman said:
I ran my GT with stock internals on 12psi on 91 octane.. the KB tune is pretty good

Isn't that pushing the envelope? I run 10 psi full time with 93 octane. Just got the 11 psi pulley but will use it only at the track with 100 octane gas. I have a friend with a Vortech @ 14 psi on stock internals....my guess is that he is on borrowed time.

00s281sc368 · Nov 25, 2004

hotmustang331 said:
Heck even 9PSI KB units are killing the stock low end...I would NOT recommend putting a KB on a 2V with stock lowend

What do you know ? Do you have one ? Go tell this to KB I'm sure they can confirm this

2000BLKGT · Nov 25, 2004

hotmustang331 said:
Heck even 9PSI KB units are killing the stock low end...I would NOT recommend putting a KB on a 2V with stock lowend....built is the only way to go with those IMO.

I encourage you to sit down with Ken Christley at Kenne Bell.

You can state your beliefs and assumptions, and he'll give you the facts.

KB have been building blowers for nearly 30 years....there is no problem running their 6-9psi kits on stock internals. If there was, they wouldn't be selling them to car owners.

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