So im gonna put a wastegate on my centri

justinschmidt1 · Aug 1, 2008

I still dont know how its gonna turn out...but should be interesting..lol

Basically, Im gonna pully my blower to make like 15-17 psi...Not sure what it will be making.

I will have a mechanical wastegate set to open at like 11 psi or so.

It should increase my power from like 2500-4500 significantly.

I hope to be making full boost by 4500

Should feel more like a turbo car and be a good bit faster.

jfor441 · Aug 1, 2008

good luck. let us know how it turns out.

jfor441 · Aug 1, 2008

did you get your belt breakage figured out?

97stanger · Aug 1, 2008

sounds pretty good, hopefully it turns out how it is planned out to. Keep us updated

joelbegt · Aug 1, 2008

sounds like a plan. what mass air sensor are you running? i've heard that running blow thru will peak it out easier, so be careful.

Paul · Aug 1, 2008

The car doesn't make full boost by 4500 now?

How are you going to tune it and how does the MAF play into the equation? Are you going to meter the air after the wastegate?

Oh yeah, and how'd you fix the belt shreddage?

justinschmidt1 · Aug 1, 2008

Paul said:
The car doesn't make full boost by 4500 now?

How are you going to tune it and how does the MAF play into the equation? Are you going to meter the air after the wastegate?

Oh yeah, and how'd you fix the belt shreddage?

The car doesnt make full boost till 6k...it makes 10psi at 6k right now. about 5 psi at 4k, 7 psi at 5k and 10 at 6k.

Im blow through, the wastegate will be before the intercooler so the MAF will never meter more than the 10-11 psi.

Im gonna get it retuned by my tuner to compensate for the earlier/maybe extra boost.

I moved the blower back a 1/16th of an inch, broke the stop off the tensioner, and put the smallest belt possible on.

Havent had a problem since.

It was out of alignment.

justinschmidt1 · Aug 1, 2008

joelbegt said:
sounds like a plan. what mass air sensor are you running? i've heard that running blow thru will peak it out easier, so be careful.

Im running a PMAS 05+ sensor, blow through, with an extender. It was pretty much topped out but im not really running any more boost, its just coming on earlier, so it should be fine.

lizzyfan · Aug 1, 2008

Got a new short block in mind, haha!

justinschmidt1 · Aug 1, 2008

lizzyfan said:
Got a new short block in mind, haha!

lol, I wish I did.

Paul · Aug 1, 2008

justinschmidt1 said:
Paul said:

The car doesn't make full boost by 4500 now?

How are you going to tune it and how does the MAF play into the equation? Are you going to meter the air after the wastegate?

Oh yeah, and how'd you fix the belt shreddage?

Click to expand...

The car doesnt make full boost till 6k...it makes 10psi at 6k right now. about 5 psi at 4k, 7 psi at 5k and 10 at 6k.

Im blow through, the wastegate will be before the intercooler so the MAF will never meter more than the 10-11 psi.

Im gonna get it retuned by my tuner to compensate for the earlier/maybe extra boost.

I moved the blower back a 1/16th of an inch, broke the stop off the tensioner, and put the smallest belt possible on.

Havent had a problem since.

It was out of alignment.

How did you move the blower back 1/16"? Glad you got it fixed.

I'm interested to see the results.

Do you have timeslips for us yet?

bany95 · Aug 2, 2008

I'm no expert, but I think that you're going to see a slight loss in top end horsepower....

Since the supercharger is still going to be making 15-17psi, it will be drawing more horsepower from the engine (parasitic loss), but the benefit of the extra 4-6psi of boost will be lost to the atmosphere.

Another way to look at it is that you're increasing the supercharger load by 35%-50% with no additional HP gains.

I'm not saying anything, just pointing out something that you may have not realized.

justinschmidt1 · Aug 2, 2008

Paul said:
justinschmidt1 said:

Paul said:

The car doesn't make full boost by 4500 now?

How are you going to tune it and how does the MAF play into the equation? Are you going to meter the air after the wastegate?

Oh yeah, and how'd you fix the belt shreddage?

Click to expand...

The car doesnt make full boost till 6k...it makes 10psi at 6k right now. about 5 psi at 4k, 7 psi at 5k and 10 at 6k.

Im blow through, the wastegate will be before the intercooler so the MAF will never meter more than the 10-11 psi.

Im gonna get it retuned by my tuner to compensate for the earlier/maybe extra boost.

I moved the blower back a 1/16th of an inch, broke the stop off the tensioner, and put the smallest belt possible on.

Havent had a problem since.

It was out of alignment.

Click to expand...

How did you move the blower back 1/16"? Glad you got it fixed.

I'm interested to see the results.

Do you have timeslips for us yet?

use a 1/16 inch washer as a shim instead of the 1/8 I was using

Ive only been that one time and somehow lost the timeslip that night

I will definately get timeslips next time I go

bany95 said:
I'm no expert, but I think that you're going to see a slight loss in top end horsepower....

Since the supercharger is still going to be making 15-17psi, it will be drawing more horsepower from the engine (parasitic loss), but the benefit of the extra 4-6psi of boost will be lost to the atmosphere.

Another way to look at it is that you're increasing the supercharger load by 35%-50% with no additional HP gains.

I'm not saying anything, just pointing out something that you may have not realized.

Yea, Ive thought about it....I really dont know what to expect from this.

Ive heard that it doesnt take much more to spin the blower to 10 psi as it does to like 15-17 psi....but who knows.

I really need to figure out how efficient it will be spinning that fast

Willis_98GT · Aug 2, 2008

sounds awesome man.. get a vid with your timeslip

justinschmidt1 · Aug 2, 2008

I want to try it but im not sure if its gonna be worht it.

It would definately suck if I waste money on this for no advantage.

Willis_98GT · Aug 2, 2008

well i'm sure it wil work out in your favor, everything sounds like it will.

Paul · Aug 2, 2008

justinschmidt1 said:
I really need to figure out how efficient it will be spinning that fast

Just find the compressor map for that blower and you'll be able to determine adiabatic efficiency at a given pressure ratio and airflow figure.

justinschmidt1 · Aug 3, 2008

Paul said:
justinschmidt1 said:

I really need to figure out how efficient it will be spinning that fast

Click to expand...

Just find the compressor map for that blower and you'll be able to determine adiabatic efficiency at a given pressure ratio and airflow figure.

lol,...I tried, but I cant really fins the compressor map, and the ones I saw I couldnt read or understand what they were saying.

It doesnt matter how efficient it is.

The fact is, if im running the same boost but spinning the blower faster, its gonna use some power and create more heat.

Even if its only 10 hp, its still 10 hp.

Hopefully, I can get it setup to where im running like .5-1 psi more to make up for any loss up top.

97stanger · Aug 3, 2008

It all comes down to if you think 10hp is worth hundereds of dollars and lots of headaches and time. If you think it is go for it. If not I'm sure you could find another mod worth more than 10hp for the money

justinschmidt1 · Aug 3, 2008

blown97stanger said:
It all comes down to if you think 10hp is worth hundereds of dollars and lots of headaches and time. If you think it is go for it. If not I'm sure you could find another mod worth more than 10hp for the money

its more than 10 hp....its gonna be making like 3-4 psi more untill like 4500 when it peaks at 10-12 psi

so in reality I will be making 30-40 hp more from 2500-4500 but after 4500 I might be down on power