I’ve spent a considerable amount of time designing and redesigning this intake with three basic goals: 1. Increase the usable power bands drop off from 4500 RPM to 6000 RPM. 2. Maintain the OEM look and keep the “Fiero’ness” intact. 3. Make swapping old with new direct and easy as possible. I’m in the prototype casting and testing phase of this project now. Once I have the final design parameters set I’ll begin production with intent to sell. These intakes are intended to be a direct replacement for the OEM intake runners and plenum. The throttle body is in the stock location; however, the TB coolant lines will need to be removed and capped at the thermostat housing. The vacuum line ports will likely be relocated to minimize hose clutter. Here are some pics of the 3D model. I’ll have pics of the runner casting up soon.
Edit; The model doesn't show a EGR port, but the castings do have the provision.
[This message has been edited by HitesFiero (edited 09-14-2012).]
How much horsepower will this increase? What is the flow rate? Also the starting price?
All HP ratings are represented at a given RPM. The intake will increase the potential air flow and increase the usable RPM range which is the target objective. The additional airflow broader RPM range will defiantly net an increase in HP. The only way to truly get an accurate measure increase would be a before and after dyno session. I can only make an educated guess based on the math, but maybe 25-30HP. The combination of shorter runners, tapered entries, and increased plenum volume roughly net a ~30% increase in flow. I haven’t set a final price yet, but it will probably be in the range of 500$-600$.
you gonna start casting heads too? short of the neck on the UIM, thats the real choke point, the mid intake is a decent design, far from great, but decent.
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This is very exciting. The only thing that throws me off about the Truelo intake is that it looks fabbed up. I want something that looks like it was OEM. This could be it.
Nice work! Now that the Truleo is discontinued this gives Fiero V6 owners a choice.
------------------ " THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Powerlog manifold, Northstar TB, LS1 MAF, 3" Flotech Afterburner Exhaust, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, HP Tuners VCM Suite. "THE COLUSSUS" 87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H " ON THE LOOSE WITHOUT THE JUICE "
[This message has been edited by Dennis LaGrua (edited 09-14-2012).]
Interesting indeed!! I'm doing a 3400 swap and I'm using the Camaro's intake, but even though it looks like it will flow better than the stock Fiero's (Again, just going off looks here. I haven't tested the flow or know anyone who has), it doesn't have the dressup of the old Fiero intake. Consider me subscribed to this thread...
Be interesting to see what the actual flow numbers will be?
I think you are going to find the square corner port runners are going to not flow what you think the math says they flow
I was just having a conversation the other day with someone who designs intakes in OZ for a racing venue and he was saying he had an intake tested on the dyno where they used 8 O2 sensors on the exhaust runners instead of just 2 in the primaries and he learned alot about one of his designs and flow distribution. He's now trying to workout how he can do comparison testing of what he found on the dyno with what he sees on the flowbench.
Got me thinking about the flow distribution in the Fiero upper plenum . . . personally I think that is one thing to consider; how the runners "see" the flow from the plenum area. If one or two runners get all the flow the rest starve for air.
Just some observations and if you need any flow testing on your design give me a shout! I'll gladly put it on the flowbench for the Fiero community!
------------------ "There is no more formidable adversary than one who perceives he has nothing to lose." - Gen. George S. Patton http://www.flowbenchtech.com
Be interesting to see what the actual flow numbers will be?
I think you are going to find the square corner port runners are going to not flow what you think the math says they flow
I was just having a conversation the other day with someone who designs intakes in OZ for a racing venue and he was saying he had an intake tested on the dyno where they used 8 O2 sensors on the exhaust runners instead of just 2 in the primaries and he learned alot about one of his designs and flow distribution. He's now trying to workout how he can do comparison testing of what he found on the dyno with what he sees on the flowbench.
Got me thinking about the flow distribution in the Fiero upper plenum . . . personally I think that is one thing to consider; how the runners "see" the flow from the plenum area. If one or two runners get all the flow the rest starve for air.
Just some observations and if you need any flow testing on your design give me a shout! I'll gladly put it on the flowbench for the Fiero community!
Thanks for your input; The pressure differential for gas (air) is at or near equal in all six runners, so distribution will be fine in a vacuum or boost setup. The port entries on the prototype have a 5mm radius on all the edges. This is very similar to some of the old tunnel ram type intakes from the 60’s and 70’s, it’s just been flattened out a bit and of course it’s dry flow (no carburetors).
[This message has been edited by HitesFiero (edited 09-18-2012).]
Progress report; - The runner assemblies top and bottom gasket surfaces have been machined. - Working on a jig for drilling the bolt bosses. - Finished templates for plenum casting cores.
when I first started looking at the thread, I thought it was just the upper you were doing. I had gutted & re-done my upper plenum to remove the runners & open the neck. It was a nice improvemnt. raised my shift point to from 4600 to 5300RPMs. still not the 6000RPM shift point I was hoping for - but, I expect thats in more head porting.
I can't wait to see some flow numbers with the lower intake installed. Personally I think the lower intake offers a significant restriction where the fuel injector bosses protrude into the intake runners.
I strongly advise that you make the "FIERO" writing on the upper a machined item rather than cast. That way your potential markets will include non-Fiero applications...
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