KB differences
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1st Gear Member
Joined: Aug 2005
Posts: 146
From:
KB differences
So I'm getting a supercharger in the next few months, and I'm without a doubt getting a Kenne Bell, but i have a problem. The 1.7L was what i was going to go with originally, but the more i thought about it, the more the 2.2L started to make sense. Because if all goes to plan this car will eventually be solely a track car. but... what is the lowest psi i could run with the 2.2L? I wont have the money to get forged internals and all that fun stuff, but i would hate to get the 1.7L and be limited to 14psi in the future. So if anyone knows what the lowest psi the 2.2 can do is i would much appreciate it, the website said 15psi i believe, but im not sure if that was the minimum or just where the 1.7L stops. Ok that was long winded and thanks in advance for the help!
Retired MF Moderator
Joined: Aug 2004
Posts: 14,891
RE: KB differences
from what i've read, you NEED forged internals for that 2.2. just get the 1.7. you won't be sorry. you might be sorry with them 4.10s and the KB though. 03/04 cobras spin all the way down the track with a KB and 3.55s.
2nd Gear Member
Joined: Dec 2005
Posts: 155
From: Ohio
RE: KB differences
they have some interesting info on their site.
here are some of the links to the ones i though were interesting.
http://www.kennebell.net/supercharge...2v/gt96-04.htm : This one is for the 1.7L looks like up to 14psi. They say it gets inefficient above that.
http://www.kennebell.net/supercharge...96-04-tech.htm
http://www.kennebell.net/techinfo/fo...s2200_2VGT.pdf : This one says that the 2.2 works from 9-20 psi.
The 2.2 doesnt start out much more exensive than the 1.7 but the key difference is that the 1.7 up to 9psi is a complete kit that is already pre-tuned. The 2.2 doesnt contain (from what i can tell) any of the extra parts like injectors, tuning, fuel pumps. That seems to be where the extra cost comes in. From what your saying your likely to need those if you push the 1.7 past 9psi anyways so it would probably make more sense to get the 2.2 and run it at least initially at 9psi. I'm not an expert or anything but i've been looking into them myself.
here are some of the links to the ones i though were interesting.
http://www.kennebell.net/supercharge...2v/gt96-04.htm : This one is for the 1.7L looks like up to 14psi. They say it gets inefficient above that.
http://www.kennebell.net/supercharge...96-04-tech.htm
http://www.kennebell.net/techinfo/fo...s2200_2VGT.pdf : This one says that the 2.2 works from 9-20 psi.
The 2.2 doesnt start out much more exensive than the 1.7 but the key difference is that the 1.7 up to 9psi is a complete kit that is already pre-tuned. The 2.2 doesnt contain (from what i can tell) any of the extra parts like injectors, tuning, fuel pumps. That seems to be where the extra cost comes in. From what your saying your likely to need those if you push the 1.7 past 9psi anyways so it would probably make more sense to get the 2.2 and run it at least initially at 9psi. I'm not an expert or anything but i've been looking into them myself.
2nd Gear Member
Joined: Dec 2005
Posts: 309
RE: KB differences
I'd go with the 1.7L. Size isn't always better. The problem with a 2.2 would be that it wouldn't be working that hard at lower RPM - if you pulley it to produce good boost down low, then at high RPM it will probably blow up your engine. It you pulley it so it doesn't do that at high RPM, you'll have very little boost down low.
The right blower is one that JUST BARELY can produce the maximum boost and air flow you need at high RPM, with a pulley so it does so. This means at lower RPM it is spinning faster and in its zone through more of the RPM range. The rule of thumb I've always found to work well is that the SC displacement should be 1/3 the engine displacement on fuel injection, about 1/4 on carbed engines: this means engine displacement should be roughly 3 times supercharger displacement in the case of a fuel injected Mustang. If its a 1.7 liter SC, thats 3x17-5.1 liters, or about right for a Mustang 4.6 or 5.0. the 2.2 I would only put on something really modded or on a big GM 7-liter V8
The right blower is one that JUST BARELY can produce the maximum boost and air flow you need at high RPM, with a pulley so it does so. This means at lower RPM it is spinning faster and in its zone through more of the RPM range. The rule of thumb I've always found to work well is that the SC displacement should be 1/3 the engine displacement on fuel injection, about 1/4 on carbed engines: this means engine displacement should be roughly 3 times supercharger displacement in the case of a fuel injected Mustang. If its a 1.7 liter SC, thats 3x17-5.1 liters, or about right for a Mustang 4.6 or 5.0. the 2.2 I would only put on something really modded or on a big GM 7-liter V8
I ♥ Acer
Joined: Jul 2004
Posts: 2,042
From: Suwanee, GA
RE: KB differences
ORIGINAL: Lee Willis
I'd go with the 1.7L. Size isn't always better. The problem with a 2.2 would be that it wouldn't be working that hard at lower RPM - if you pulley it to produce good boost down low, then at high RPM it will probably blow up your engine. It you pulley it so it doesn't do that at high RPM, you'll have very little boost down low.
The right blower is one that JUST BARELY can produce the maximum boost and air flow you need at high RPM, with a pulley so it does so. This means at lower RPM it is spinning faster and in its zone through more of the RPM range. The rule of thumb I've always found to work well is that the SC displacement should be 1/3 the engine displacement on fuel injection, about 1/4 on carbed engines: this means engine displacement should be roughly 3 times supercharger displacement in the case of a fuel injected Mustang. If its a 1.7 liter SC, thats 3x17-5.1 liters, or about right for a Mustang 4.6 or 5.0. the 2.2 I would only put on something really modded or on a big GM 7-liter V8
I'd go with the 1.7L. Size isn't always better. The problem with a 2.2 would be that it wouldn't be working that hard at lower RPM - if you pulley it to produce good boost down low, then at high RPM it will probably blow up your engine. It you pulley it so it doesn't do that at high RPM, you'll have very little boost down low.
The right blower is one that JUST BARELY can produce the maximum boost and air flow you need at high RPM, with a pulley so it does so. This means at lower RPM it is spinning faster and in its zone through more of the RPM range. The rule of thumb I've always found to work well is that the SC displacement should be 1/3 the engine displacement on fuel injection, about 1/4 on carbed engines: this means engine displacement should be roughly 3 times supercharger displacement in the case of a fuel injected Mustang. If its a 1.7 liter SC, thats 3x17-5.1 liters, or about right for a Mustang 4.6 or 5.0. the 2.2 I would only put on something really modded or on a big GM 7-liter V8
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