Allen supercharger safe at 9 psi??

tylerdred · Jul 4, 2004

I finally got a power adder for my 2001 mustang gt. It is the allen supercharger 9 psi kit. Here are the kit contents for those who dont know:

- one-piece cast aluminum manifold
- air to water intercooler
- mechanical water pump
- Eaton M90S-ported supercharger
- integral bypass valve
- fuel pump voltage booster
- 30 lb/hr fuel injectors
- billet fuel rails
- custom chip
- all brackets, belts, hoses and hardware for an OEM quality installation.
- upgraded mass air meter

I am mostly concerned with destroying my stock 2001 gt engine. I noticed that a lot of people on this forum run 9 psi without any fear of breaking anything on their motor. But I found it weird that the allen company that makes this kit says that running at 6 psi is safe but says that you should only run at 9 psi if you have beefed up the bottom end. What do you guys think? I know a lot of you run 9 psi on stock motors. Is this safe, or is allen supercharger correct?

http://www.allenengine.com/01must1.html

ZaC851 · Jul 4, 2004

Get a tune and you should be safe.

kennym01 · Jul 5, 2004

I talked to Allen Engineering also, I was considering the Allen supercharger as well. They told me the same thing, that the 6psi kit was what they recommended to stock mustangs. They have been around for quite a while and seemed to know what they were talking about re: their kits. They do a lot of installs on those kits, so from their stand point the 6psi is the safer of the two kits. That being said, I new someone out here in California that ran the 9psi kit for about a year and he didn't seem to have any issues. If your worried enough why don't you just swap your pully and go with the 6psi?

2002BLGT · Jul 5, 2004

unless you are getting that blower really cheap , like under $3000 I would buy the KB 6lb for like $3700 and it would give much better results , KB ROCKS !!!!!!!

tylerdred · Jul 5, 2004

kennym01 said:
I talked to Allen Engineering also, I was considering the Allen supercharger as well. They told me the same thing, that the 6psi kit was what they recommended to stock mustangs. They have been around for quite a while and seemed to know what they were talking about re: their kits. They do a lot of installs on those kits, so from their stand point the 6psi is the safer of the two kits. That being said, I new someone out here in California that ran the 9psi kit for about a year and he didn't seem to have any issues. If your worried enough why don't you just swap your pully and go with the 6psi?

I seem to hear that there are a lot of people running 9 psi that have no problems. But I guess it just carries more weight when the manufacturer of the kit tells you that its not safe. Do you know what kind of work is involved with swapping out the pulley?

B C · Jul 6, 2004

If you do go to 9 psi make sure you get it retuned. I am pretty sure their kit is only tuned for the 6 psi pulley. Going up 3 PSI may require additional octane unless it is retuned.

kennym01 · Jul 6, 2004

tylerdred said:
I seem to hear that there are a lot of people running 9 psi that have no problems. But I guess it just carries more weight when the manufacturer of the kit tells you that its not safe. Do you know what kind of work is involved with swapping out the pulley?

I don't think it's a big deal changing pulleys but I would talk to Allen Engineering and find out exactly what you'll need to do...

Dan_Soprano · Jul 6, 2004

30lb injectors sounds kind small to me. I would think that you would need AT LEAST 36lb ones.................

LEAN = BANG!!!!

jstreet0204 · Jul 6, 2004

Dan_Soprano said:
30lb injectors sounds kind small to me. I would think that you would need AT LEAST 36lb ones.................

LEAN = BANG!!!!

Bigger wouldn't hurt, but these kits only make about 325 at the wheels. Same as the saleen roots blowers.

2002BLGT · Jul 6, 2004

KB nonintercooled kit would kick the allen in the NUTS , I wouldnt waste my $$ on it for the price

KB nonintercooled 8 lbs pulley and SNOW PERFORMANCE boost cooler would definitely be better

tylerdred · Jul 6, 2004

jstreet0204 said:
Bigger wouldn't hurt, but these kits only make about 325 at the wheels. Same as the saleen roots blowers.

Is that at 6 psi?

As for those who say to get the KB, you guys are right, the KB is better, but I got such a great deal on a brand new kit. I couldnt pass it up. I've also heard that these allen kits have pretty good long-term reliability and OEM quality, which im assuming is why SVT puts the same eaton blower on their cobras. A lot of other manufacturers exclusively use eaton blowers on their cars.

BLK_ROUSH · Jul 6, 2004

Not a waste of money-just get tuned

2002BLGT said:
KB nonintercooled kit would kick the allen in the NUTS , I wouldnt waste my $$ on it for the price

KB nonintercooled 8 lbs pulley and SNOW PERFORMANCE boost cooler would definitely be better

Let's see after several years. ALLEN has a fine kit and it is a viable alternative to the KB kit.

Man everyone is absolutely nuts over the 9lbs numbers!!!

Back on topic:
9lbs shouldn't be too harsh on your engine. 9lbs here on the SVO nonintercooled unit for 90K miles.

Dan_Soprano · Jul 6, 2004

tylerdred said:
Is that at 6 psi?

As for those who say to get the KB, you guys are right, the KB is better, but I got such a great deal on a brand new kit. I couldnt pass it up. I've also heard that these allen kits have pretty good long-term reliability and OEM quality, which im assuming is why SVT puts the same eaton blower on their cobras. A lot of other manufacturers exclusively use eaton blowers on their cars.

Hummm, and thats why Ford went to the Autorotor/Lysholm twin screw for the ford GT and for the new Cobra plans? Not to take away from Eaton, they are a great and established company, But the Twin Screw design is superior to the Roots one.

Sam98 · Jul 6, 2004

ZaC851 said:
Get a tune and you should be safe.

9 psi should be fine with a conservative tune. Detonation will kill your motor fast, and the stock pistons and rods won't handle 400 RWHP for long. I've been running 11 psi on my 98 GT with about 320 RWHP for a couple of years with no problems...

el_kid_1 · Jul 6, 2004

Does the kit include an intercooler? If so, you should be fine.

00s281sc368 · Jul 6, 2004

BLK_ROUSH said:
Let's see after several years. ALLEN has a fine kit and it is a viable alternative to the KB kit.

Man everyone is absolutely nuts over the 9lbs numbers!!!

Back on topic:
9lbs shouldn't be too harsh on your engine. 9lbs here on the SVO nonintercooled unit for 90K miles.

Everyone ? Who is everyone ? What are the 9lbs numbers of Allen kit?
I doubt there is much to become nuts over

Please show some numbers to prove it's a viable alternative to KB kit...

nickthegenius · Jul 6, 2004

BLK_ROUSH said:
Let's see after several years. ALLEN has a fine kit and it is a viable alternative to the KB kit.

Man everyone is absolutely nuts over the 9lbs numbers!!!

Back on topic:
9lbs shouldn't be too harsh on your engine. 9lbs here on the SVO nonintercooled unit for 90K miles.

Check out WRXRacer's profile. When is 9lbs not equal to 9lbs? http://forums.stangnet.com/member.php?userid=41886

I'd gladly take a Vortech, Paxton, or a KB running at 9lbs before I'd lay down the money for the 9psi Allen kit. At least I would feel like I spent my money wisely and have 350-380hp on tap depending on the tune.

kboy262 · Jul 6, 2004

Correct me if I am wrong but i believe SVO uses a M112 versus the M90. The M90 I think puts out a lot of heat and that is why they use a intercooler with their kit. I read this in the past so I am not too sure about how true this is. I know people who use the SVO supercharger for the 96-98 and have the 9psi pulley without issues and no intercooler.

kennym01 · Jul 8, 2004

These Allen kits all come with intercoolers and the dyno #'s are 320rwhp & around 360-370rwtq with 9psi pulley. At 6psi your at about 290-300rwhp & 330rwtq on a stock 4.6 motor. I agree that the (twin screw) KB kit is a more efficient way to go but it is also more $$$ if you go with the intercooler. I'm all for intercoolers when your supercharging. If you have the bucks the KB (twin screw) w/intercooler is the the way to go, but that being said any car getting 300 or so rwhp (which will put you around the high 12's in the 1/4 mile) is pretty respectable in my book.

prsrizdgt · Jul 8, 2004

I replied to this thread, but its not showing up for some reason so here goes again. There is no issue with running the 9psi pulley. I have for well over a year on the 9psi option with no problems. My complaint with Allen was how conservative their tune was on the chip that comes with the 9PSI option. Before, at 6psi and stock computer, I would get a little faint pinging at WOT that you could only hear with the windows rolled up. It was on the ragged edge I guess. With the 9psi pulley and chip, there is absolutely no pinging at all, and Scott at Allen told me that they tune them to use 91 octane because that is all they can get in CA. At the time I bought my kit 3 + years ago I couldn't find any good info on a complete, well designed kit from KB. The Eaton is a tried and true supercharger that the whole world uses. The "kit" is everything else associated with the install, and the Allen is as said before OEM quality. Horsepower is horsepower, personally I don't give a **** how you get there, just get there with a system that lasts.

Allen supercharger safe at 9 psi??

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