I was just wondering if there were any gains on an FI motor between the LS6 and the FAST.

Thanks.

-Geoff

 

There should not be any difference between the two.

 

I *think* Speed Inc. is going to use this intake on their monster T88 setup...

 

And Rob is also using the fast intake on the new setup.

the fast intake allows up to a 90mm throttlebody. that in itself must provide some benefit for a FI setup.

 

seems a waste of cash to me (unless you got too much)

dont see reason to do this until you are running something with a discharge ID larger than 3"

 

We are running it on the Formula and hope to be dynoing it this week. We are going to Dyno test it with and without the runners in it (without, it will be similar to sheetmetal intake). We'll let you all know the results when we have them.

I added some pics of the LSX intake to the Formula Project Car page the other night. We painted it to match the car, and also filled in the EGR area and made an adapter plate to use with the stock TB until the 90mm TB's are released.

 

I know it is a lot of money, but once you squeeze all the juice out of your combo, sometimes you have to spend a little more cash to get that extra little bit. If someone has squeezed 500 rwhp out of their setup and they want to get more power on pump gas, then it might be worth it to them if it gets them to 540 or so. If it only gets them to 510, then it would probably not be worth it. I was just wondering if anyone had run the 'A to B' test yet.

-Geoff

 

I guess I would like to hear about Rob's results before deciding, but I've made over 800rwhp thru an LS6 manifold and I wonder how much more, if any, I would make thru the LSX, e.g., how many hp/$.

But Might Mouse you raise a good point, sense I have a 3" discharge pipe, which now has to flange up to the 4" Pro M maf, which then has to connect to a 4.75" throttle body, maybe a 90mm manifold inlet makes some sense?

 

I was just told that the LSX manifold will not hold more than 10 psi. Has anyone else heard this?

 

No more than 10psi.. ?? huh. Does not make since to me.. If it's true that sucks!!

Stealth, ever thought about running a Holley aluminum intake? You can direct port them and put a bag of ice on it before each race.

Remember I have one and I'm having great luck with it. It does not get that hot at all. A Little hotter than the LS6 or LSX sure. But it's not that big of a difference. Also remember that you can port the intake to match the heads.

I did my 621RWHP pull with a hot motor and hot intake. I was driving in warm weather for about 30 minutes to the dyno day. 10 minutes after I got there it was my turn and I pulled on the dyno with everything being hot. Did 2 pulls. 1st one spun the tires at 5,000 rpms on the dyno. 2nd pull 5 minutes later did 621RWHP.

Pretty cool to see the tires spin on the dyno..

Clint

 

I know that one guy switched from the LSx to the LS6 and picked up 40-50rwhp. 730 with the LSX and 778 with the LS6.
Phillip

 

Hate this as I do... I agree with DC. In FI the $900 FAST intake seems rather ineffective. Seems that GM made the ultimate all-around performer in the LS6 for FI apps, anyhow.

In NA, there may be a slight advantage, but it remains to be proven.

Sorry MM. Don't mean to screw up your hate thing.

Nice to have you back ROB! Seems you've been out of touch. WHAT'S THE NUMBER ON THE FIRETURD???

SC

 

I run an lsx intake....

At 5-6 psi I made 582 I will let you know how 10-12 psi and a full run to 7k goes soon enough. Just need to fix some fuel issues. Maybe I lost 40rwhp like the vette guy did and Im really 620 with an ls6 right now If you got money then get it, why not...if you dont stick with the ls6. Either way I dont think you can go wrong.

 

umm no he made 778 with the ls6 and switched to the lsx and said he lost the power but never bothered to switch back to the ls6 and dyno again.

http://forums.corvetteforum.com/zerothread?id=788701

He never bothered to return with the results cause my guess is he found his error and it wasnt the intake

Then he posts this saying he ran his fastest with 730 rwhp ??? Somethings fishy

http://forums.corvetteforum.com/zerothread?id=795099

Looks like to me he had a nice little dyno spike to achieve 778 cause he was selling the lsx intake on that same board. So he made 730 back with the ls6.

 

MY hate thing? oh please do come on

i havent seen one of these intakes personally, but maybe the hardware and mating surfaces just arent secured appropriately for positive pressure.. i am SURE this type of testing was done by fast before the first intake went to the public, would just take a phone call.

stealth you are right, all we need is a larger tb and a larger hole in front of the intake to compensate for the blade etc. in the way. everything else is fine with the ls6 intake.

 

I can tell you this..theres no good way to hold the sensor in the back of the intake in. Have to basically zip tie it down otherwise under pressure it willl fly out.

Slowhawk can chime in for a more techincal response.

 

Well Opticz06's before and after times definitely show a difference.
Phillip

 

either way his car is retarded fast

 

Yes,the biggest downfall is the MAP sensor on the LSX.There is no clip to hold it down so you have to jimmy something.
This intake can handle lots of boost,probly more than 99% of the guy's around here are running.
I really don't believe someone would lose HP by switching from a LS6 to a LSX if the LSX is installed right.Look at 5 liter and 580hp at 5500rpm with only 6lbs of boost on his built 346.That in itself say's the LSX is not hurting him,damn his Cam peaks at 6800

 

5 liter - Are you running the LSX with the runners in or out? 582 from 6psi is crazy.

Thanks