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The path of the warrior.
 
Rodsrsr's Avatar
 
Join Date: Jul 2006
Location: Nor Cal
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Intake mods/H.P increase???

How much H.P. can you expect to gain by upgrading to a big bore throttle body and extrude honed intakes on a forced air carrera 3.2 motor? Is this worth doing, or does the gain not justify the cost?
Old 09-22-2007, 07:08 PM
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I'm sure there's a little to be gained, but it's last on my list. I prefer the smallest throttle body I can use and stay under 300 ft/s intake speed. My engine's a little over 300 right now so I plan to increase my stock Carrera TB by two or three mm. Extrude honing would be nice, but I'd rather spend the money somewhere else and there's plenty of other places to spend money .
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Old 09-23-2007, 12:02 PM
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I increased the size of the throttlebody on my project based on a measured pressure drop across the butterfly of 1.25 PSI at 10 PSI (no intercooler at the time).

I looked at it from the standpoint of thermal load... If you remove the restriction, then the turbo will not have to work as hard to get the boost charge into the intake manifold, thereby reducing back pressure on the turbine. Gains are small and obscure, but are more prevelent as the air volume being moved increases with higher boost levels. Note that items like intercoolers are also restrictive, probably more so than the throttlebody.

Sorry, no solid answer here.

I don't know about the extrude honed intake. Ask someone with a flowbench who build porsche racing equipment.
Old 09-23-2007, 01:23 PM
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When I got my 3.2 L intake Extrude honed... I had them do a before and after flow test. The flow was not dramatically improved... which is what I expected. I did not do the Extrudehone to make major increases in air flow... but mearly to even out what was already there. The 3.2L intake is much better than the stock 3.3L intake as it is, so I was not looking to make huge gains...

When the intake came back, it looked very nice inside. It had an increase of 35 to 40 CFM more than what it had before the process... what it DID do, is even out the runners. Before they were within 20 CFM of each other..when it came back, they were all within 5 CFM of each other. I would think that the closer the individual cylinders are to each other, the smoother the running of the motor... and the most important part IMHO...is the more even the A/F's will be...and that my friend..is the name of the game... ( A/F)

I am also going to start out by running the stock 3.2L TB....and maybe down the road change it.. I dont want to go too big though... you will be playing hell with off idle A/F's when you step off from an idle...
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-35RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 09-23-2007, 07:40 PM
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Brad is there pics anywhere of your car, the spec list sounds killer!
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Old 09-24-2007, 01:04 AM
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spence, thanks for the kind words... I dont want to hijack this thread...so here is a link to pics of the motor and car...

another 930 rebuild....It is FINALLY coming together!!!
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Brad...930 gt-1 racecar, increased displacement to 3.6L, JB racing Cylinders, JE 8 to1 pistons, stroked crank, Carrillo rods, extrudehoned 3.2L intake, full bay Bell I/C, GT-2 EVO cams, Rarly8 headers, GTX-35RS turbo, twin plug, P&P heads, Link G4 EFi system, G-50/50 with LTD slip and oil squirters/oil cooler, zork tube, full race coilover system, with carbon fiber body, full cage, E-85 sippin drunk
Old 09-24-2007, 12:31 PM
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