Accufab 70mm TB+Plenum UPDATE

propellerhead said:

You won't feel 2-4 rwhp gains. If you do, it's in your head.

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Dark Knight GT said:

I'm not saying that all vehicles respond the same when I say this, but he should have gained more than any 4rwhp with the addition of a Accufab 70mm throttle body and matching plenum. 4rwhp across the entire power band, with peaks of 7-8rwhp is the bare minimum I would expect to see over the stock throttle body and plenum setup on a car that is relatively stock. If he has any other mods, it should only make the power gains even better. I've heard of peak gains of greater than 11rwhp and 7+rwhp across the power band on GT's with just bolt-ons, like cold air kits and exhaust mods.

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cougar694u said:

6.31 RWHP & 6.88 RWTQ gain with BBK Long Tube Headers, BBK X Pipe, Magnaflow Catback, Steeda Pullies, and a 75mm TB, not a 70. However, the difference would be very little from 70 to 75 (maybe 1hp?)

http://www.modulardepot.com/?show=articlesdet&aid=38

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SCT Guy said:

While I think you gathered all the right data, I think it was intrepted wrong. I think rather than posting the best HP and TQ for each one, you should have posted the average. I took the liberty of doing that here....

Here is the average of the three runs for each elbow.

Stock 265.52 302.04
Acuufab 271.88 308.22
C&L 270.89 305.86
Dragon 270.05 306.55
TrickFlow 269.51 304.27

Now, I then took the liberty of applying a simple density correction based on the temp of the elbow that you measured. Basically each degree change in temp is a .12% change in density. HP is directly proportional to density, so this is a pretty legit correction to make.

As a summary the Accufab and Dragon were run the coldest, 72F and stock was the hottest, 76F. this correction makes the assumption that the average temp of the motor is a better reflection of the temp going into it, rather than ACT temp....

Stock 267.43 304.21
Accufab 271.88 308.82
C&L 271.22 306.23
Dragon 270.05 306.55
TrickFlow 270.48 305.37

Now, if you notice after this correction, the stock number is very, very close to when Matt re-ran the stock piece, 267.44. So, since these two seem to agree, I would probably not apply any more correction factors. I actually worked more of them up based on viscosity difference from the difference in temp and what not, but the numbers don't change too much more since the drag torque change from a 10 degree oil temp change is about .11%.

The bottom line, the way I see it, there is about 4 RWHP to be gained with one of these pieces and probably about 2 RWTQ. I realize that the accufab part made more torque but the average is skewed by one of the three runs, where it was different by quite a bit. On this particular run, the A/F ratio was at least a half point difference than the other runs. If you threw this out, their RWTQ average would be 307.12 RWTQ. This supports about 2-3 max RWTQ increase.

Bottom line, 4 RHWP and 2.5 RWTQ. Probably not worth the money spent. If you have a higher powered engine, you would probably see more gain. If you have a lower powered engine, you would see less gain....

j

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-=NightHawk=- said:

the plenum and throttle body only are noticible after u pair it with a good set of heads, cams and a blower..and possibly a full exhaust...you cant say "this part is **** y did i spend 400 dollars on it" because it IS worth it, if youre planning on further modifying the vehicle...every part works together..not individually

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ponysarepretty said:

except for gears

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