Dynamometer Results & Comparisons - Any vendors ready to come clean - LS3/L92 FAST

I know a few vendors have dynoed the FAST 102 on 402+ strokers with LS3/L92 heads but are reluctant to post results.

How about posting results - good, bad or no change?

I don't think they have time to post results......

They are busy on the phone with FAST trying to get return authorizations.

Kevin, aren't there a number of shops that already have posted decent gains ? I could've sworn that I read at least 3 if not 4 different threads about swaps from intake X to the new 102 mm LSXr, one was unported, the rest were ported. 10-17 rwhp gains if my memory is accurate. I'll see if I can dig up a link. Good luck looking for the info.

Kevin, aren't there a number of shops that already have posted decent gains ? I could've sworn that I read at least 3 if not 4 different threads about swaps from intake X to the new 102 mm LSXr, one was unported, the rest were ported. 10-17 rwhp gains if my memory is accurate. I'll see if I can dig up a link. Good luck looking for the info.

Wasn't that with the LS7 though? The stock LS7 intake is in another universe compared to the L92/LS3 intake. So, if FAST can get 10-15rwhp vs that, then you would hope it would be a lot more for the LS3.

I have a 427 LS3 on the dyno right now, but I am not about to drop a grand for something that hasn't proved anything that I have seen. If someone wanted to send me one, I would be willing to test it.

Oops, my bad. Apparently that speed reading class I took *(J/K) isn't paying the dividends I had hoped. LOL

Sorry though, my comments were posted in error. I misread Kevin's post. You are correct, the available threads are ls7 vs ported and unported LSXr 102mm intake.

I guess I'd like to throw my name in that hat as liking to see some ls3 vs fast 102 mm intakes. A-B comparsion !!

Nah, Doug, your memory and speed reading are fine:

http://www.ls1tech.com/forums/dynamometer-results-comparisons/1183178-engine-dyno-testing-ls3-intakes-inside.html

http://www.ls1tech.com/forums/dynamometer-results-comparisons/1179786-2010-camaro-ss-fast-lsx-r-102mm-results.html

There's not tons of them yet, but it looks decent and consistent so far. Seems the LS3 versions are giving close to advertised gains, even translating to rear wheel power, which is pretty good. Not as dramatic as the LS7 versions, but definitely worthwhile for those looking to maximize a given combo.

Obviously, you'll see proportionately more on wilder builds that are intake restricted, i.e. if you pick up 10rwhp on a stock motor, you'd probably pick up 15 on a bigger cube or heads/cam jobbie. EDIT: I take it back, if it you look at it from a HP/ci standpoint, many of these are almost as dramatic as the LS7 gains.

I remember one that only picked up a couple but can't find it. My guess is there was a tuning or other issue at play but who knows. There's not TONS of these dynos yet, but my money is on similar gains to the ones above. I think FAST took the extra time to release to make sure the gains were consistent. I am looking forward to seeing more of these come in over the next 2 weeks.

And as many know, not all porting is created equal so don't assume that ported FAST = ported FAST.

I personally am trying to decide between Konis or a FAST for my LS3 build. It's only because of the consistent results that I am even considering a FAST, but am still leaning heavily towards Konis. :usa:

I know one vendor that has run it on a stroker build...It's not my place to post up his PM to me. Maybe he'll chime in here. I know about the TSP thread but that was a stock LS3 block...Not results to write home about there and the L76 intake is already not too bad on the stock CI's. Waiting for 402+ builds to post. Not looking for shoulda-coulda-woulda's. Let's see some charts.

http://forums.corvetteforum.com/c6-tech-performance/2431424-fast-ls3-102mm-intake-manifolds-in-stock-vengeance-racing.html

Here's one-essentially no gain til 5200.

http://www.ls1gto.com/forums/showthread.php?t=334343

Here's another that shows a more substantial gain. But in between dyno runs they changed from a (what I presume to be) heavier bad clutch, to a fresh lightweight one-so really can't say the gains are from the intake.

And as many know, not all porting is created equal so don't assume that ported FAST = ported FAST.


I will try and find the thread later but there is one thread where the vendor said they swapped a stock LS3 FAST out with a ported one and it actually lost power.

Vengeance Racing is working on the results your looking for today. They are A/B comparing a stock ls3 to a FAST 102 manifold on a LS3 with a 239/251 cam, milled heads, L.T.'s/bullets, and vara-ram. The results on a stock LS3 were comparable to what a stock LS3 ported intake puts down. So I would not expect any amazing peak numbers. It might make some nice midrange increases though.

Vengeance Racing is working on the results your looking for today. They are A/B comparing a stock ls3 to a FAST 102 manifold on a LS3 with a 239/251 cam, milled heads, L.T.'s/bullets, and vara-ram. The results on a stock LS3 were comparable to what a stock LS3 ported intake puts down. So I would not expect any amazing peak numbers. It might make some nice midrange increases though.is this going to happen any time soon? he made everyone wait on the vette board.

we are building a 427 for a G8 GXP. It will still be a few weeks away, but we will be posting results when its done.

we will post results good, bad, or otherwise.

is this going to happen any time soon? he made everyone wait on the vette board.


The same C6 that the intake was tested on with bolt ons is starting in about an hour... We will complete testing Monday. We installed the LS3 manifold on the engine with the new camshaft/milled cylinder heads. Once the car is FULLY tuned with the LS3 we will swap to the LSXR 102 and make any tuning adjustments needed and post the results good/bad/other.....

Im sorry you guys have to wait for these tests... Unfortunately they take time and they cost money to perform...

Im sorry you guys have to wait for these tests... Unfortunately they take time and they cost money to perform...

And not to mention you had the Customer Appreciation Party to get ready for which I heard was great and I am sure that week your plate was more than full......

Sounds like this is going to be one of the test's everyone is looking for.

The other being the ported LS3 vs the "out of the box" FAST.

MONEY, that is what so many people forget that testing costs money. If you want test results faster then pay for them, if not then please sit back and wait like the rest of us. LOL Just making a point.

MONEY, that is what so many people forget that testing costs money. If you want test results faster then pay for them, if not then please sit back and wait like the rest of us. LOL Just making a point.

Roger that! Though if impatience is a sin...:D

well his r&d is what makes money. if he get results that are good. if it was a tfs headed motor with a ported intake everyone would have results yesterday right?

I'm with c5 on this one, chill out on beating up the vendors. If somone wants the results so bad ,PAY for them or respect the time frame the supporting vendors offer.:D

I know a few vendors have dynoed the FAST 102 on 402+ strokers with LS3/L92 heads but are reluctant to post results.

How about posting results - good, bad or no change?

I think this is a fair question to ask... The vendors were just as antious as everybody else to see this thing come out. I think some guys have results but are looking at ways to improve it. Thats fine with me. As soon as a couple of shops come out with some good results from ported Fast 102's, I'm grabing the best available!

I've tested the 102mm intake/TB compared to a ported LS7 intake fully.It gained a decent amount across the rev range.

Haven't had anyone interested in a stock LS3 yet.But when I do we will fully tune the stock intake and compare it to a fully tuned 102 intake.I hate the threads that throw an intake on an untuned car,too many variables.

http://i88.photobucket.com/albums/k176/VengeanceRacing/scan-18.jpg

Vengeance Racing Stage IV Camshaft
Comp 26926 Valvespring Kit
.025 Milled off cylinder heads
Vararam Induction
ARH Longtubes
B&B Catback

Stock LS3 Manifold Vs FAST LSXR Manifold
Both fully tuned

Looks like a respectable overall gain.

Great job Ron,
Now do a ported LS3 and overlay all 3 and then we have a very good comparison. The bang for the buck will probably become very evident.

Looks like a respectable overall gain.

You really think so? 9/8 peak? There are some areas under that the FAST outperforms but there are also some areas under where the LS3 outperforms.

I think if the same car had a ported LS3 on top of it, it would have shown that the 102 at this point is a waste. So there are only really 2 hopes left-the 102 tb really improves things-or a "porter" figures out what to do with the 102 to make it perform better (or a combination of both).

Thanks again to Ron for taking the time to do this and for posting the results.

Wow ether the fast sucks or the ls3 is pretty bitch'in. I too would want to see an ported fast on top of their.

You really think so? 9/8 peak? There are some areas under that the FAST outperforms but there are also some areas under where the LS3 outperforms.

I think if the same car had a ported LS3 on top of it, it would have shown that the 102 at this point is a waste. So there are only really 2 hopes left-the 102 tb really improves things-or a "porter" figures out what to do with the 102 to make it perform better (or a combination of both).

Thanks again to Ron for taking the time to do this and for posting the results.

I see what you are saying but there is a nice gain in the 4000-4500 rpm range of around 15 rwtq (coincedentally where many a roll race begins). But overall not as dramatic as many hoped for. It is however an option for the individual looking for every last HP from there motor.

I see what you are saying but there is a nice gain in the 4000-4500 rpm range of around 15 rwtq (coincedentally where many a roll race begins). But overall not as dramatic as many hoped for. It is however an option for the individual looking for every last HP from there motor.

3000-3250 LS3 performs better
3600-3900 LS3 performs better
4000-4400 FAST performs better
4400-4700 LS3 performs better

Gaps in between they are tit for tat.

Then at 4800+ FAST outperforms and doesn't let up.

But, and I dare to say, if this would have been a ported LS3 I am almost willing to bet money that it would have performed better than the stock FAST all the way through.

So will we see this same FAST intake ported, and re dyno'd ?

Stock LS3 vs out of the box FAST yields 8/9, how much for porting?

Last comparison that will NOT happen IMO would be what someone suggested, ported ls3 vs ported fast. At least we will hopefully see unported ls3 vs ported fast.

They are porting the FAST now to see if it has any more in it. It will be the same car same everything for comparision purposes. But yes it looks like the out of the box FAST and a ported LS3 would be neck and neck.

Results are what they are folks!!! Going to do some porting and see what happens.. Porting will take a while to really nail down with all of the removable runners etc etc.. Its going to take some time.

Agreed that a ported LS3 manifold would more than likely hang with the stock FAST.. That being said, for someone doing a conversion having to buy an intake the FAST isnt so bad... For those with LS3 engines already the FAST may be a stretch...

Will post up some ported #s within 24 hours...

Thanks Ron. That's pretty expensive for the return. The car would probably go faster after a good dump. :bang:

Very dissapointing but in line with what I've heard elsewhere. :cry:

Results are what they are folks!!! Going to do some porting and see what happens.. Porting will take a while to really nail down with all of the removable runners etc etc.. Its going to take some time.

Agreed that a ported LS3 manifold would more than likely hang with the stock FAST.. That being said, for someone doing a conversion having to buy an intake the FAST isnt so bad... For those with LS3 engines already the FAST may be a stretch...

Will post up some ported #s within 24 hours...


Looking fwd to seeing the update on this one. I also see your point on if you need an intake for a conversion it may be a better option then the ls3 (2 birds with one stone) . Don't rush the results, just do a killer port job and show us what she can do !!!

These results are on stock LS3 heads, right? I wonder if going to ported LS3 heads would show a bigger restriction on the GM intake and allow the FAST to make a little more power?

On CorvetteForum, RPM showed the flow through their CNC heads with the stock LS3 intake and a box-stock LSXR and the difference was huge - so you'd think it would show more than 8-9HP.

Take the Vararam off and just add a K&N cai. The Vararam needs to breath to show any gains.

Will post up some ported #s within 24 hours...

You only got a few hours left :D

Just F'ing with ya Ron.

How did the porting go on the test piece? Did you do it yourself or did Charlie knock it out ?

Still working on the intake. Customers car is up and running and out being tuned for drivability. Hoping to have this intake finished before the car leaves...

I hope its done before it leaves!!! how else will it leave

pacebria I guess this is your car EH! I'm just taking a while guess but is this a vette? If so DAMN 5oo hp with cam, intake and full exhaust damn brah that is awesome.

Like someone else said, the LS3 intake is ok for stock ci motors, but with more and more LS3 416 ci motors and LS3 427's out there it would be nice to see a dyno test on a stroked LS3 motor that isn't using stock heads(If you can only afford stock heads you can't afford a FAST intake, right)

Like someone else said, the LS3 intake is ok for stock ci motors, but with more and more LS3 416 ci motors and LS3 427's out there it would be nice to see a dyno test on a stroked LS3 motor that isn't using stock heads(If you can only afford stock heads you can't afford a FAST intake, right)

Exactly!

I don't think they have time to post results......

They are busy on the phone with FAST trying to get return authorizations.

This made me lawl....



Ported LS3 > butt-gouging expensive FAST

pacebria I guess this is your car EH! I'm just taking a while guess but is this a vette? If so DAMN 5oo hp with cam, intake and full exhaust damn brah that is awesome.

Yep, and yes it s a vette. The crazy thing is these numbers are made with a factory crank pulley(no underdrive) Thats another 5-8rwhp that could be had, the factory heavy clutch, 20x13 heavy wheels take away a little.and the car has the same pump gas in it that it had 7 months ago. I would say there is at least another 10rwhp to be had and maybe a couple more with the ported FAST.

I think with some cnc'ed heads and the things I mentioned swapped for lighter parts someone could get 530 out of a stock bottom end N/A LS3. Thats pretty impressive!!!!!

I have learned to guess hp on the low side, so if it doesn't make your expectations you won't be disappointed. If Ron says she'll make the number, then I'll have a little more confidence in the 530 rwhp guess, but if he didn't I am thinking it sounds a bit high. Even with the swaps you mentioned. Add an EWP too if you want your best shot at 530 rwhp

That was a esimation of my own, I don't think Ron would agree with that number. I am a dreamer!!!!!!!!!!!!!!!!!;-)

These results are on stock LS3 heads, right? I wonder if going to ported LS3 heads would show a bigger restriction on the GM intake and allow the FAST to make a little more power?

On CorvetteForum, RPM showed the flow through their CNC heads with the stock LS3 intake and a box-stock LSXR and the difference was huge - so you'd think it would show more than 8-9HP.


"RPM?" is that a sponsor over there? Please dont say RPM Outlet.

RPM inc.
http://forums.corvetteforum.com/c6-tech-performance/2444227-ls3-fast-102-intake-flow-results.html

"RPM?" is that a sponsor over there? Please dont say RPM Outlet.

RPM Inc, as quoted above. They do so amazing work. The smaller shops doing outstanding work with the LS3s and LS7s aren't really on this board, which is a shame.

what were the final #'s with the fast? ron never came back on here.

Bump. What happened??

Its going to take some time to find out work works on porting the FAST, Vengeance is still working on it. They will be at LSX shootout from now till next week.

Agreed that a ported LS3 manifold would more than likely hang with the stock FAST.. That being said, for someone doing a conversion having to buy an intake the FAST isnt so bad... For those with LS3 engines already the FAST may be a stretch...

Im in the conversion spot. Dont have an intakemanifold, rails or injectors. Som im waiting to see if going with the fast setup is worth it, or going 700-800 and getting the complete ls3 intake, rials and injectors from sdpc is worth it.

Bump for kicks, giggles, and results.:bang: