chasgiv3

iTrader: (1)

Well I'm finally breaking down and spending some money on the car so I thought I'd go from my old LS6 intake to the LSXr and see what improvements I can get from it.

Anyone else have experiance with the swap on a FI car?

chasgiv3

iTrader: (1)

Ok this isn't very scientific but from seeing other dyno sheets out there they seem to be getting about a 9% increase in RWHP from this swap in a FI setup. Meaning that if I got 908RWHP at 23PSI through my LS6 intake I should get 989.72 RWHP at the same PSI. Less resistance and therefore more flow at the same pressure levels.

I'm oversimplifying it but it'll be interesting to see what it dynoes after the swap.

posenheimer

Expect a loss of torque down low, but pick up power up top.

djfury05

iTrader: (30)

Pretty sure most guys are making more power at the same boost level when they switch.. good enough for me plus I haven't seen a post on here about one cracking yet, only people claiming they've seen one with no proof.

So.jerZ-28

iTrader: (20)

buddy of mine does alot of tuning, said to me that on a 400-600 hp car, the lsxr102 is not really worth the $900 for the gains seen. But if your above that or every h.p. counts to you than yes its worth it.
I sold mine cuz I'm a m6 400+ci so not to worried about the low end torque loss and 50-60hp aint gonna bother me, I'll just turn up the boost 1-2psi

p.s. he's tuned probly 100+ cars w/lsxr102, and yet to see one crack from boost and 90% of them running 18-24psi

lemons12

iTrader: (71)

Because of the new runner design, shouldnt they make more torque?

I'm talking 4500+ rpms..

So.jerZ-28

iTrader: (20)

yes, you'll make more up top, but down low gonna loose it. down low is where it usually counts. better 60=low et
if he's launching high R's and on boost then ok. as far as I know, most boosted cars suffer lack of torque due to low compression.

lemons12

iTrader: (71)

Is anybody in here launching below 4k rpms though?

98Z28CobraKiller

iTrader: (17)

I have never seen a dyno sheet for a FAST intake in which it didn't make more power everywhere than the LS6. It's a long runner with better flow characteristics. It's not like switching to a short runner carb style or sheetmetal intake that moves the power band up.

Up until very recently, I have been limited to 3500 launch RPM due to a problem with the transbrake on my old Th350. I still cut very consistent bottom 1.3's with the occasional 1.28-1.29 60' on a really shallow stage. I run the old FAST90 intake.

lemons12

iTrader: (71)

Kinda what i thought.. On my small cam/head car I picked up everywhere from my ls6 to ported 102.

djfury05

iTrader: (30)

That's what I like to hear! Thanks!

So.jerZ-28

iTrader: (20)

my original point was.... is the 40-60hp worth $900 for the intake, when you can just add another pound of boost for it.
Also I'm new to FI...... so excuse the stupidity of concern for loss of low end torque.

I also won't have the slips you guys have cuz im leavin .75+second on the table
.......m6.......

djfury05

iTrader: (30)

Until you break it enough times and then switch to an auto

So.jerZ-28

iTrader: (20)

TH400 sittin on shelf, but it'll stay there!!! (unless I get bored w/ 9's) lol

djfury05

iTrader: (30)

I'll pay shipping and you send it to my house then lol?

So.jerZ-28

iTrader: (20)

$500.00 + the ride and its yours.... consider it a donation to my future m6 rebuilds...lol

narx66gmc

Really it will only cost u ab $700 cuz shdnt the ls6 sell for $200-250? So, 60 more hp for $700 at ur power level sounds like a good deal. And, if u put it on and then add 1 lb, now uve added 120 more efficiently...

lmt0705

iTrader: (7)

so if you just swap the intake without changing anything else what kind of increase should you expect to see. (without changing pullys or adding more boost) boost pressure should drop but how much of a power increase should you expect?

yelo04goat

iTrader: (11)

might not see much gain like that... your gain will most likely come from bring boost back to where it was.

chasgiv3

iTrader: (1)

You're dead on. I'm overcoming inefficiencies by adding more boost.
My problem is when you go beyond a certain point in boost you run into potential problems such as spring pressures higher temps in your intake charge also.

For long term reliability I'd like to stop at 25 psi and run solid 8.70. Or just a bit faster. But I could just add another two pounds also.