Dyno for Greatg

[GREATG]

Well as promised I went back to the same dyno after my baseline with a few goodies installed. This chart is the payoff for a Friday night spent under my car.
Stock exhaust vs. 3 inch, no other changes. It is a custom made 3inch from the S pipe elbow back.
As for the theory that a bigger exhaust kills low end torque, take a look at 1500rpm to 2500rpm, there is a gain of about 25 lb-ft.

Original Thread with baseline: http://www.msprotege.com/forum/showthread.php?t=52396

[jonnydoe48]

that is a really nice gain. 3 inch turboback or catback?

[t3ase]

Nice.

[GREATG]

These are some pics of my custom made 3inch exhaust with 3" high flow cat, resonator and muffler and stock looking tip, no Check Engine light. It crimps down to 2.5 roughly at the connection to the S pipe. It sounds deep and rumbles on decel. Not many backfires.

[t3ase]

Okay, since you brought it up, I have to ask. Since you're going from a 2.5" (2.25?") diameter hole, why use a 3" exhaust?

[GREATG]

Next things to go on were the FCD, and the Joe P MBC and the boost gauge.
This is with my 3 inch exhaust, FPR, FCD, MBC @ 13psi, flashed, NGK BKR7E, and here's the kicker, the stock air box pried open (I don't have a K&N). Same shop, same dyno, a little warmer because the shop doors were closed. The baseline is cold IC, first pull, the one towering above it was after a few pulls and with a much hotter IC.
The A/F on the wideband was going nuts. It would start out low around 10.2 to 1. Then at 5000 is would lean out to 12, then at 6000 it would jump to 11-13-11-13. It was a heartstopper. Then we turned the boost down.

[t3ase]

Careful with the FCD.

[GREATG]

Here are some pulls back to back with about 11psi and the air box pried open. The wideband was reading 10.2 till around 5000 then it would lean out to 11

[GREATG]

This is what happed with the air box closed after the 180 runs. The boost went down by itself and hp sunk. This is likely what I would make at a stoplight with a warm engine. A/F ratio was more steady with the box closed.

[GREATG]

Some pics at the dyno

[ARunto]

when you dynoed are you dynoing on pump gas or race gas on the high psi runs? any detonation? i found my motor to detonate at 9psi on pump gas. what gap are you running on the spark plugs?

-Alan

[GREATG]

Fun on a Friday night:
The install took about four hours, removing the stock was a slut even with WD40 everywhere. The O2 sensor did not want to budge. Also a pic of the place for the wideband to plug in near the elbow.

[GREATG]

when you dynoed are you dynoing on pump gas or race gas on the high psi runs? any detonation? i found my motor to detonate at 9psi on pump gas. what gap are you running on the spark plugs?

-Alan
I was running Sunoco 94 and there was no detonation with 4 pairs of ears listening. I was nervous about it though above 10psi. I saw the hp #s though and said up with you, boost!

[ARunto]

what did you gap your sparkplug to?

[GREATG]

The thing about the gain stock exhaust vs 3 inch is, the boost level can change. Last year when I got the 3 inch first put on, I was running at 10 psi. Then on the way home from the shop it went up to 12. Last night I wanted to baseline the boost gauge with the stock exhaust, but I couldn't get it installed. I had to wait to do it at the raceshop. I think it was at 6psi for the first run before turning it up, but it was with no MBC on the car. That was the 169.5 run. Then I installed the MBC and started turning it up. So basically if you are Joe MSPer you can expect 22hp out of a system like mine, bolted on with no other changes. That may or may not include a small jump in psi. By the way, the 3inch makes the car way easier to drive smoothly.

The plugs were gapped to .035

[jonnydoe48]

Okay, since you brought it up, I have to ask. Since you're going from a 2.5" (2.25?") diameter hole, why use a 3" exhaust?
http://www.vishnutuning.com/news_pvnrt.htm

this should somewhat answer the question, i think. it explains how this can be beneficial and increase airflow.

not sure though. i am still questionable about it.

[t3ase]

That’s right, the ideal turbo exhaust system would smoothly taper in the other direction- from smaller diameter (the same size of the turbine discharge outlet) to larger diameter over a short pipe length. The length of the exhaust system would be short enough to minimize exhaust gas friction while long enough to incorporate a suitable horn-shape with a diameter rate-of-change aggressive enough to minimize exhaust back-pressure while gradual enough to keep from inducing boundary layer disruption (when the exhaust flow no longer smoothly flows along the surface of the pipe but instead separates from it and becomes turbulent).
Okay, so how is a 3" immediately after the S-pipe gradual? You suddenly have a 3" opening and the airflow gets disrupted. Instead of the gradual "<", you have "-[:"

EDIT: Looked at the pics again, there is a *small* gradual V. I still don't think a 3" exhaust is needed though and would love to see a 2.5" system put on there for comparison.

[MazdaSP]

woah... i wanna see him make those runs with ions cai that supposedly adds 24hp...195 to the wheels with just the flash and fcd mods brings a little joy back into my life, i already have mbc, fpr, and 3inch S-back exaust

[GREATG]

And the prize goes to mp5jeff, only 6 hours till the liar, liar, pants on fire calls. Take a look at 5252rpm on every chart there sport.

[MazdaSP]

i see the crossings... maybe he was looking at them in red/blue instead of red/red and blue/blue?

[mp5jeff]

no i was looking at them right, i have 2 hours of slep and im tired, my bad it does cross!

[mp5jeff]

And the prize goes to mp5jeff, only 6 hours till the liar, liar, pants on fire calls. Take a look at 5252rpm on every chart there sport.
what is my prize? could it be a new exhaust like yours! id love a 20whp exhaust please!

[CustomMSP]

Very good info!

Thanks.

[mp5jeff]

what kind of muffler is that, its nice looking, i like how the tip isn't too big...

[GREATG]

Very good info!

Thanks.
I am at your service sir. Here to help.

The parts of the system are from here
www.vibrantperformance.com (http://www.vibrantperformance.com)

[mp5jeff]

are you affiliated (sp?) with vibrantperformance at all? just curious how you found them if not.

[GREATG]

I found some pics of the pipe on the car,
and one of my seats, my old tires, and one of what mom thinks of people trying to pass the Mazdaspeed.

[GREATG]

are you affiliated (sp?) with vibrantperformance at all? just curious how you found them if not.
No and they found me.

[mp5jeff]

ahh, how'd that happen, they saw your car and offered sponsorship or something to that degree?

[GREATG]

They wanted to build one for a MSP I donated mine.

[mp5jeff]

ahh sweet, did they give you any discounts? or maybe even free stuff?

[pip7441622]

I used thier aluminum intake pipes to build my cold air intake. Good stuff. So you just got the exhaust system made out of thier universal products or are they making a bolt on system for us?

[CommieSpeed]

GreatG...great thread, good to see some numbers! I would also like you to know that my desktop is now your mom giving the finger...that shit is funny!!! Also...I have worries about using my FPR with the flash. I see that you use a FPR with flash...do you think this is a good idea? Is it really helping us?

[ONRAILS]

I found some pics of the pipe on the car,
and one of my seats, my old tires, and one of what mom thinks of people trying to pass the Mazdaspeed.
Hey bud... what model sparco's are those? I've been thinking about putting some in myself. Are they heavier than stock? What about installation... do the kits fit well, or were they a pain in the ass to install?

[GREATG]

Commiespeed, I am not that confident with the FPR and higher than 10psi of boost. Seeing the Air / Fuel Ratio freak out at high rpm and 13psi was not fun. I leads me to believe the computer really doesn't know what to do with it, so leaning it out is asking for trouble. But the FPR definately helps with fuel economy and low boost, so I am going to keep it on.
pip7441622 last I heard they have made two prototypes and that's it. I assume a bolt on sys is what they have in mind.
D stickney My seats are Torinos, they are installed with custom brackets from the same shop that did my exhaust. They are made with heavy gauge steel just in case my car ends up on its roof at a racetrack. So they are heavier than stock, 48lbs versus 32 pounds per stock seat.

[ND4MSP]

any plans on a front mount or IC sprayer for the stocker? And did you do any tweaking with the fpr at lower boost to realize any more gains? I'd love to have a wideband and and fpr for the hey of it, just to see how much can we realy benefit from it. But I don't plan on any massive modding any time soon. Not sure if its really cost eff.

[GREATG]

ND4MSP An FMIC would be nice but its not in the budget right now. I haven't done any tweaking to the FPR, not sure what I would do? Has anyone else done this? Mods are never cost effective...

The most surprising thing from the dyno is how restrictive the stock air box & paper filter are. It jumped 11hp at 10 psi just by lifting up the plastic air box during a run.

[ND4MSP]

My bad about the fpr, haven't seen joep's product. Can anything be done with it?. I'm stock with exeption to my mbc at a lil less than 8psi, I think my first mod is gonna be a new replacement filter and hack my stock box some.
<Semi jack> anyone seen or purchased one of those cool blue (accel I think) replacement filters?

[KyRaceFan]

JoeP's FPR isnt a Fuel Pressure Regulator, just a reducer. It taps the Fuel Pressure line, and cuts the signal out a tiny bit to lean the map under boost. You cant adjust it.

And those are nice gains... very nice.

[jflo]

how much did the custom work for your exhaust system cost total ?

[GREATG]

jflo it would be around $1300 Canadian pesos.

By the way, the guys at the dyno said they just baselined a SRT4 at 230hp, 260 tq. Ouch.

[MSPDAVE125]

I thin his HP numbers are all because of his snow tires!!!!!!!

Less rotating mass and softer rubber!

[Wesman II]

This Exhaust system is for sale now, its sold by www.etdracing.com it will be roughly $1000 Canadian dollars. It is from the stock s-pipe back.

[Wesman II]

and bump

[Wesman II]

this is the pics:
http://www.msprotege.com/members/Wesman%20II/`1/post-18-39872-pipes.jpg
http://www.msprotege.com/members/Wesman%20II/`1/post-18-39909-pipes1.jpg


this is the time I ran with 14psi and this exhaust, no flash, FPR, FCD.
http://www.msprotege.com/members/Wesman%20II/`1/post-18-40070-st_thomas.jpg

[wicked]

wow,those are all over the place.thats a crazy power band. next-tuning.