0Mike @ CMS

So we have all seen good numbers made with the FAST 102 intake manifold and 102mm throttle bodies, we wanted to see just what kind of difference there is between a stock 90mm and a 102mm. Our friend Chris was nice enough to be our test subject. He brought by his 2005 Pontiac GTO A4.

4.125" bore x 4" stroke 427ci
West Coast Cylinder Heads Stage 2 LS3 heads
Ported Fast 102 w/ stock 90mm throttle body
Comp Cam 235/243 114+3
1 7/8 Headers w/ custom dual 3" magnaflow exhaust
Prototype Over the radiator intake
Tuned by Ryne with HPTuners in speed density
Xtreme Transmission built 4L65 w/ 3600 stall converter

Converter was locked during dyno pulls.

Pink= stock 90mm throttle body
Green= 102mm w/ Prototype over the radiator intake
Red=102mm throttle body w/ Halltech M107R Air intake (corvette intake)

Red :We picked up 11whp and 20wtq from a simple throttle body swap and Halltech M107R air intake, being that this car is tuned in Speed density, the additional air flow is clearly recognized by the leaner A/F ratio. Obviously the Halltech does not fit on the GTO we installed it simply for comparison.

C7&7

very cool.

0Cunningham Motorsports

we thought this could be a informative post for people who are thinking about spending the coin on a NW102 and a halltech M107r or Cf112 intake...... obviously this is a ls3 headed motor, and obviously on a ls7 motor with the gains will be more...

ITS STOCK

Wow it picked up some nice gains in the mid range too. I wonder if I could see 10whp gains on my smaller cubed motor.

TurboLX

So that's a 2.2% improvement at best, part of which is admittedly due to a change in AFR. I'd be curious to see what's left once AFR is adjusted equal for all cases. Most aftermarket dynos are rarely accurate to less than 2% and combustion stability is at least 1% error anyway, so I'm not completely convinced.

Interesting experiment, but I'm not sure it justifies the cost and potential reduction in idle/tip-in control.

0Cunningham Motorsports

yeah greg i didnt even touch the tune, just swapped and ran it.... for what it is worth, i have tuned this particular car to death, have had the AF all over the place, and it has always made same power at 12.5 as it did near 13, so for what its worth, that might help a little, i probably should have corrected the AF, but it was a quick test and i ran out of time , had a customer showing up for a tune.... the fact that it did go lean with the addition of the Halltech intake does indicate the airflow increase, therefore i feel the potential is there in a higher airflow motor like an ls7

locosmith

Not worth the bread...Pfft

firefighter813x

Changing the intakes skews the numbers... did the first dyno pull have the same intake as the second?

A test on a stock cubed LS2/LS3 would be more interesting. I'm sure that any restriction in airflow on a large engine will inhibit dyno numbers. As locksmith mentioned, the cost for those few horsepower isn't worth it IMHO.

Regardless, thanks for taking the time to post results and do tests like these for the forum.

0Cunningham Motorsports

the second run was with the same intake as car runs everyday

HoustonSVT

Seems to me to make it a true comparison you would now need to put the 90 tb back on and leave the Halltech 107 cai on, then compare that.

KLLRVET

was this the same intake used on the 90mm test and the first 102mm test?

0Cunningham Motorsports

yes.... the first run is with the existing 90mm tb and intake, the second run is with the addtion of only the 102 tb, the third on was with the addition of the halltech intake

_GTO_

Impressive gain

Any pics with the M107R installed on the GTO ?

BLW BY

JML

You should run yours on their dyno, they've got big #'s

BLW BY

Those HP# would be 630+ at the crank.
Not realistic!

Please; Inform the public.

0Cunningham Motorsports

what are you talking about? 511 rwhp equates to roughly 580-590 crank, remember the converter is locked during these pulls....

0Cunningham Motorsports

no, it didnt fit at all, not even remotely close, only good for a dyno comparison

90droptopp

I own the GTO in question. Are you saying my numbers are inflated?

Justasheet

I ran the same time as you in humid South Florida and I'm only @ 479hp to the wheel. Does seem a little high (511 hp) but I'm not questioning your word.
Jeff

JUIC3D

GTO only weighs what, 500lbs more than a C6?