that collector makes my wewee hard.
48IDA
frankenstein 13B. GSLSE 6 port block w/ s4 rotors, 12A Y-plate center iron (Tall runners) all stock size ports that have only had the runners cleaned of casting.
I'm convinced I've got all the power out of exhaust tuning possible. My problem is the long Auzzy IDA intake manifold I run. Hense my power dropping off hard after 7400 RPM.

 

I am semi interested in this. My car was the last megasquirt project for Grassroots Motorsports. The car made 160whp on a DynaPak which the tuner (DIYAutoTune) advised showed roughly 10-15% off local Dynojets.

Right now the car runs a mild streetport 13b six port. Third Gen Rotor Housings, S4 Irons, and RX-8 Rotors. Six ports system removed and a RB Streetport Exhaust system. I think the exhaust is the biggest bottleneck at this point.

(Disclamer I love the RB Exhaust for an everyday car. It makes good power on mildly modified cars, lasts forever and keeps the noise resonable)

I was going to get the car retuned this spring with an less restrictive exhaust after the headers. I was also planning on changing to an S5 Intake and getting the 5th & 6th ports operational. I could probably get a run on the RB Header then change to this setup. An update on the car is likely going to go in the magazine.

 

Looks good! Nice results with stock porting for sure. What type of header length, collector style etc did you end up with on the exhaust? How long is the auzzy IDA manifold?




Dyna packs, at least ours, read 7% lower than the local dynojets. On average they are only about 2-4% lower. But at any rate, the 5th and 6th ports will definitely add power. Even on a stock gsl-se engine we ran, 20 rwhp gained from opening the 5-6th ports. Racing beat street port system is much better than the regular header. But a good amount of power is still left on the table if switching to a race style like ours.

 

From what I understand he has his set up with a focus on road type load tuning for driveability rather than for power testing.

The 5th & 6th ports have been completely removed at this point. We saw a 20whp gain going from the stock GSL-SE fuel injection to Megasquirt. I want to reinstall them for the added torque. No low end torque with light rotors, a 9lb flywheel and 6 puck clutch is fun on track and at the autox but really sucks everywhere else.

I have the stainless RB Road Race headers now. Do you think the just the headers would show significant gains (5+) over the RB SP headers? I plan on running an more free flowing system either way. I figure a free flowing exahust will bump the figures regardless of the header.

If I don't go with the headers is the collector available for sale? I would love to to get one and mate it to the RB SP header flange as a start to the rest of the exhaust system.

Good work with the products and testing. Its nice to see a company focusing on maximum gains. The people that are looking to get the most out of the motor are probably willing to pay the price. (Im looking at dj55b here)

 

These look pretty dang good, and i would buy one of these but im tight on my budget right now so it'll have to wait.

 

well i would not pay the money to buy a proto type unless you buy it back when the research term is up.
If your looking to get your product wanted buy the consumer you need other consumers to say good things about it, charging for it would not be the way i would go.

Heres a idea you make 10 complete headers for the 12a and 10 for the 13b and if need be 10 for the 20b.
now you get a list of all the people who are willing to risk there car and engine for your product and put all there names in a hat. Draw out 10 names and let the lucky winners know they have been selected and all they need to pay is shipping to get the new header now this comes with a contract that they have 1 year or however long you think they will need to test your product after said time you pay to have it shipped back to you.

This way you can cut them apart and see were your work needs to be inprooved changed or modifyed or stay the same.

then you have them write a testimonial about the new header or product and you can then sell it customer backed and tested.

we all know when the guys on this sight like something we will let others know, and you can even make testing tread that the testers can write how things are going so we can all see real time how the product holds up.

not saying anything bad about you or your product this is just how i would do, you sometimes have to bite the cost to make the money.

Best of luck

 

It's just the typical Auzzy manifold. Runners are too small and too long. like this one, but the 6 port verion.

Here's the RB mani for compairison.

Dave @ Mazdatrix said he would take the manifold I had port them out and chop an inch out of them sell them for $800, and they still didn't make as much power as the $250 Racing Beat ones.

 

Those are both too short in my opinion. Just like the exhaust there is "ranges" of ideal lengths to correspond to both being equal in resonance. Sure going shorter will eventually hit the resonance again, but the power band will very narrow. In my experience something longer will be much more powerful, and wider in torque production.

 

So I have a 6-port 13B from a S4 in my 85GS. I use right now a RB GSL-SE header. My issue is that the exit where the 2 runners meet is about 1 3/4" IIRC. The RB header for a FC's exit was about 2 1/4" (also IIRC). Whats the exit of yours? I can see it gets progressively larger. I just feel like my car falls flat up top, it could use a larger exhaust setup :/

 

2" throat. But the collector needs to be built properly to use that size.

 

Is the collector available for sale?

I would love to to get one and mate it to the RB SP header flange as a start to the rest of the exhaust system.

 

My deposit has already been sent down for this header. I should hopefully have it in my position after my trip down to Georgia.

 

I, too, may be interested in a collector to fit the RB "road race" header.

 

Collector with megaphone would be $160.00 if anyone wants one made to fit the RB road race header.