oneblackvette

Hey added 102mm unported to Dads C6 in place of a ported 92mm. He lost 15 RWHP and 10RWTQ. We reinstalled the 92 while still on the dyno and most of it came right back. (A few tuning pulls on each to try and better things). His car is all stock bottom end and heads with LPE cold air and Kooks with High flow cats/ Corsa Sports. Anybody want to through some ideas at this.

Fore58

I just believe that the 102mm is too big for most stock/bolt on application. A lot of members had struggled with this intake. I was comtemplating on buying one, but the results just turned me away. Sorry to say it, you're are not guaranteed anything with this. It's just not worth it. And that probably the reason you could buy it at a good or low price.

Mez

My guess is the 102mm changes the air flow dynamics at the front in the intake manifold which causes a decreases in the port velocity or the timing of the wave pulse to the intake valve. I am surprised it would have this much of an impact, however.

This also would have an impact on the MAF and VE tables which would require it to be retuned. But in WOT, you are just playing with the MAF and timing so I would assume you guys tried to retune but it did not help.

WHITE_SHARK

You scares me dude,

I also have this intake + NW 102mm TB

my car is equipped with g6x3 cam and bolts on + ATI pulley

I'am not sure if I gained any single hp from this TB and fast intake setup or I lost more!

anybody who have installed fast intake 102mm with good results? please share your info and experience.

I hope you retuned the motor after installing it!

Thanks

Gering

I have heard the same thing from a few speed shops.

Finster07

Sorry to hear that. I have just been dragging my feet upgrading(?) from a ported 90 to a 102. Although I have aftermarket heads, cam, etc, I just dont want to spend the $$ for minimal gain....or even a loss. LSCHLEM sure had his share of issues with the 102 as well. Time will tell....

good luck.

sallen619

What motor? LS2 or 3?

oneblackvette

2006 ls2

NORTY

The problem is velocity (or lack thereof.)

High velocity intake charge will make excellent torque down low and lower midrange.

sallen619

I read that the LS2 version of the FAST 102 needs some porting done to it...

silverbullit2006

i dont have much done to my car and have never had the 92mm so not sure how helpful this will be... i pulled 377whp with the 102mm and ported stock throttlebody, a vararam, slp loudmouths, and then a tune. i noticed big difference but as i said before.... never had a 92 ported... ls2 mn6 by the way

silverbullit2006

oh yea and as far as install... A+ ..very easy

Mez

Really? I was just pulling this theory out of my a$$. It makes sense, I suppose but 15 rwhp is a lot to loose on just a +10mm increase. That's ~4% on a 400 rwhp engine.

filmjay

As I was getting all the parts together for my build, I was actually recommended AGAINST the Fast 102. I was decidedly assured by numerous reputable sources that a stock ported LS3 intake would be more than sufficient. And that's on a 600rwhp cammed/FI LS3.
But the 102's are not recommended for FI or nitrous at all because the walls of the intake are thinner than stock....and they have the rare tendency to go boom. Which sucks because the guys that could really make use of it is the FI crowd.
Not to say a FI guy can't use a 102 successfully, but those rare/odd chances of something popping are increased.

I'm just waiting on Weiand or Fast to come out with an aluminum intake like their LS1 pieces.

In this instance, I'd agree with the diagnosis of decreased velocity. But, you might have got your numbers back (maybe + some too) if you'd taken the time to fully retune the car for the new intake.

just my .02

LSCHLEM

Sorry to hear about the disappointing results. As A BOLTON LS2 the
benefit from the 90/92 was staggering with almost everyone reporting
in 20+ RWHP/ RWTQ . The 92 benefited from PORTING by another 10 to 15. The 92 is a mismatch to the cylinder heads and is exacerbated from porting. Yet it makes power that literally everyone reports strong results.
Along came the 102. Not much at all said for the LS3. The :LS2 owners
got good gains too from the 102 comparing it to the OEM.

This is really the first real world test pitting the 102 against the ported FAST 90/92. I would have at least thought it would be a draw. 15 is A real
disapointment. Thats what popular opinion seems to be saying " the 102 should be about as good as a ported 92".
Look what the shops/ Vendors are saying who are selling them. From what I seen they are comparing the PORTED 102 to the NON PORTED 102 against the stock OEM.
I ask the OP to post the dynocurves to see where the HP/TQ was lost
in comparing these two manifolds.
I have reason to believe the 102 should be better.
Its a good PORT MATCH with OEM HEADS and a natural with the TFS
Heads. I have both of them,took them apart , measured many things and I can say the runners in the 102 are smaller and longer than that of the 92 and should benefit from porting. I do have A 102 out for porting
and will do a PORTED 92 VS A PORTED 102. Im glad I did not sell the
92 as I had a ton of offers and pulled it off the Market.
To the OP I would ask he post the dynocurves and wait for results from
another real world A/B TEST before disposing any of these Manifolds. Leon

Finster07

Ported 92 vs Ported 102 on a head/cam car......long overdue. I will be anxiously awaiting the dyno results on that comparison!

timd38

Thanks for saving me $900!

C7&7

I installed the 102 on my car after cam and headers and picked up 19rwhp and 21ftlbs. However I do now have an idle dipping problem when I press in the clutch and go to neutral at a stop. I am starting to contribute this to the fast.

carlrx7

If not a vacuum leak than the Base Running Airflow table needs modifying.

C7&7

Yup everyone is telling me about the airflow table. However I have had the car back to LG twice for some tuning tweaks and it is still doing it. I am assuming they know to bang on this table.

Where you thinking it could be leaking vacuum? The issue does seem to only happen like 2-3 times out of 20 stops and mostly when the car is cold.