Blower Porting

David,

I wanted to respond regarding your question about not hearing many people using PSE to port their blowers, but thought this would best fit in its own thread.

The majority of GT500 owners have used a very popular internet sponsor for their porting. This particular shop advertises a lot on forums and in mag's. But if you read closely there are always inconsistencies with the data and how it is presented. The real story is that after a port by that shop, your blower is usually worse than before with worse heatsoak and worse lower-end torque; so they have to change the tune or change the pulley to make it look like there was a gain from the port.


Here's my experience with PSE:

I currently have a C&L cai, a 2.65" pulley and a VMP tune on my car. I had my blower ported by PSE Superchargers and the results were amazing! We dyno'd the car before and after and made absolutely no other changes. I gained a real, useable 34 rwhp & 17 lb/ft Tq and the gains were across the full rpm band. That was consistent through three dyno runs with little cool down time, not just a cold run advertising number.

Here is a brief summary that Ed Martinez (PSE owner) posted on another forum regarding the temperatures:

"Hi sprint,

I am happy to see you are enjoying your PSE ported S/C.

I wanted to comet on the air temps you posted. I noted that others were eager to compare my porting with others. These comparisons can be misleading if they are not the same.

When you and I were reviewing the data stream from the SCT Live Link, we took all 3 Dyno runs before porting and averaged the 3 down stream temps. First run, 114.9°, No. 2 run, 131.4° and No.3 run at 126.2°. Remember the first run is usually the coolest.
The total of these 3 is 372.6° then divide them into 3 and you get the average temp of 124.16°

After PSE Porting we performed the same test with no other changes. As the dyno sheet shows the outside temp was 64.6° on the before test and 64.0° on the after test.

First run, 109.9°, No. 2 run, 107.3° and No.3 run at 111.0°. Remember the first run is usually the coolest. Well, Your PSE porting changed that by not allowing the air to get hotter to begin with.

The total of these 3 is 328.2° than divide them into 3 and you get the average temp of 109.4°

124.16° -109.4° is 14.76° Average Cooler @ 6200.00 RPM

Run No. 2 is the first run that most tuners start comparing results with so run No. 2 gave you a total charge temp drop of 24.1° @ 6200 RPM. A garden hose spraying in the heat exchanger also could drop this an extra 20°

All 6 runs were performed with an average time of 4.5 minutes apart and your power improvements with no pulley change were across the power band.

If you were looking for peak top end power, a change to the blower seal timing on the discharge side could be performed as I have seen, but that ruins supercharger for street or open track use. The low rpm output drops like a rock and your torque goes away but as the blower spins faster the output starts to increase. You could add a pulley to make up for the loss as I always see, but porting a blower is intended to provide an improvement throughout the operating range. Eaton Engineers know what they’re doing and continue to develop improved superchargers every year. "

One big difference between PSE and other porting services is the seal timing, like Ed mentions. When you look at some ported blowers you'll notice a whole upstream from the original charge air outlet. That does a couple of bad things, it allows air to escape the blower chamber too soon and not develope full boost (at low rpm's) and then (at higher rpm's) it allows charged air to be forced back up into the s/c and fight against the rotors which appears on the gauge as higher boost but is not "good" boost. It also actually increases the charge air temperatures.

There are significant gains to had porting these blowers. Just do your homework on the real world results of the different porting methods. Some try to claim gains but, when you read the fine print, they've changed pulley's and/or tunes to make up for actual losses in the porting job.

Good info there, much to think about now. We just don't see much about porting stock blowers on the gt500's like they 03/04 cobras. Everyone just buys a bigger blower now a days it seems.

I am interested in porting mine. good info.

Jerry, Stiegmeier has some great deals going on with their ported blowers.

It is def. one of the best bangs for the buck horsepower wise.

Stiegmeier is the last place I would take my supercharger. Most of the references I made about how to do it wrong in the first post were examples straight from his shop...............

sprint200 wrote:Stiegmeier is the last place I would take my supercharger. Most of the references I made about how to do it wrong in the first post were examples straight from his shop...............

lol, I knew tht was coming, stieg has been getting alot of bad press lately.

"Note to self" Stiegmeier...Piece of Sh.....

05SatinGT wrote:"Note to self" Davids GT500...Piece of Sh.....

Fixed

Fixed

Leonard 95 wrote:

05SatinGT wrote:"Note to self" Davids GT500...Piece of Sh.....

Fixed

You guys quit. Your being children

admin abuse, lol

That wasnt admin abuse..... He just quoted you and then changed the wording. I can do that.

damn we must be bored at work today.

Really? Maybe for GT 500s but for 03/04 Cobras he is awesome.

I've never heard anything bad about him. He's a super nice guy and knows exactly what he's doing.

SVT03Chris wrote:Really? Maybe for GT 500s but for 03/04 Cobras he is awesome.

I've never heard anything bad about him. He's a super nice guy and knows exactly what he's doing.

Go to modular fords and svt performance, lots of threads of him bashing another vendor etc. It got pretty nasty at modular website.

Just buy a real Blower girls

SVT03Chris wrote:Really? Maybe for GT 500s but for 03/04 Cobras he is awesome.

I've never heard anything bad about him. He's a super nice guy and knows exactly what he's doing.

Show me a single third party test with a before and after dyno WITH NO OTHER CHANGES that yielded gains across the band.

Every test I've seen, there was a "re-tune" or "new pulley". I even saw one where the graphs were obviously switched from before & after.


I will give him this much, He's really good at internet marketing

KBCal wrote:Just buy a real Blower girls

Even yours would benefit from some porting work.



There are always compromises in the mass-production casting process that will negatively affect the airflow; on the inlet side specifically. It's knowing what to touch and what to leave alone that's tricky.


And I just might get a real one some day.......................TVS

Not a Truley Very Slow......ok not too funny it was the only thing that came to mind. I just like the KB but I will admit its not fun anymore if its not blown

Leonard 95 wrote:

SVT03Chris wrote:Really? Maybe for GT 500s but for 03/04 Cobras he is awesome.

I've never heard anything bad about him. He's a super nice guy and knows exactly what he's doing.

Go to modular fords and svt performance, lots of threads of him bashing another vendor etc. It got pretty nasty at modular website.

Are you talking about him and POSI?

If you are, I agree he didn't act very grown up like. However, when he ports the blowers they are stronger than ever.

Yea, him and posi, he does act like a prick in some of his post about results. He had one on the gt500 multiboost kit, he would never really answer the questions people where asking. Just avoiding good questions like iat's and stuff.

sprint200 wrote:

SVT03Chris wrote:Really? Maybe for GT 500s but for 03/04 Cobras he is awesome.

I've never heard anything bad about him. He's a super nice guy and knows exactly what he's doing.

Show me a single third party test with a before and after dyno WITH NO OTHER CHANGES that yielded gains across the band.

Every test I've seen, there was a "re-tune" or "new pulley". I even saw one where the graphs were obviously switched from before & after.


I will give him this much, He's really good at internet marketing

Almost every week a new thread is posted from a member on SVTP getting their blower ported by him, saying, how much they love it and so on.

I know TONS of guys over on SVTPerformance that are super happy with the ported blowers from him.

Pretty much everyone says it's an amazing upgrade unless you just want to skip it and go for the TS.

I couldn't imagine every single member on the boards over there lying about their ported blowers.

SVT03Chris wrote:

sprint200 wrote:

SVT03Chris wrote:Really? Maybe for GT 500s but for 03/04 Cobras he is awesome.

I've never heard anything bad about him. He's a super nice guy and knows exactly what he's doing.

Show me a single third party test with a before and after dyno WITH NO OTHER CHANGES that yielded gains across the band.

Every test I've seen, there was a "re-tune" or "new pulley". I even saw one where the graphs were obviously switched from before & after.


I will give him this much, He's really good at internet marketing

Almost every week a new thread is posted from a member on SVTP getting their blower ported by him, saying, how much they love it and so on.

I know TONS of guys over on SVTPerformance that are super happy with the ported blowers from him.

Pretty much everyone says it's an amazing upgrade unless you just want to skip it and go for the TS.

I couldn't imagine every single member on the boards over there lying about their ported blowers.

I'm not asking about tons of guys that "LOVE" their ported blowers


I'm asking to see this......


Shot at 2008-04-23


Shot at 2008-04-23

With no changes except porting.....................I've never seen one example

When you say no other changes, what do you mean? They at least adjusted the tune right? And what vehicle was this on? I am asking because I am interested in getting mine ported and would like some info.

I mean no other changes. Those are from my car last march/april.

Porting, done right, minimizes turbulence as the air enters the compression chamber; thus improving blower efficiency. It doesn't radically change the "boost" or the amount of air flow....etc.

Note that heat soak was very apparent in the before pulls, with power dropping off dramatically from the first to the second pull. Then see the after runs where the third pull is within 3rwhp of the first!

The atmospheric conditions on both days were almost identical and the time between pulls was very similar and the only cooling aid was a squirrel cage fan pointed at the grill. The hood was down for all pulls, as the C&L cai is very sensitive about airflow.

so could the same results be expected out of the stock eaton.

03.sonicblue wrote:so could the same results be expected out of the stock eaton.

Mine is a stock Eaton (just a different pulley).

Do you mean a "Termi" Eaton or a "non-pullied" Eaton?

I would expect more gains from the older gen Termies because the new M122H on the GT500's was already more efficient in stock form.

looks like they do good work. But you need more HP more more more

I need more money more more more

Yes, I am referencing the terminator. I like the bang for the buck out of the porting.

buy some dynomite if ya like bangs