Intake gain?
Intake gain? I am currently running a LS6 intake and a stock ported TB. My question is will I gain much using a Fast 90/90 set up? I am spraying a 250 shot now and plan to go to 300 after some quarter runs this weekend coming up .
Any help would be great , post results or info if you have.
Any help would be great , post results or info if you have.
I'm very interested in this also, but searches aren't very definitive. They just say to use the search. Obviously there will be gains in the upper RPM range, but I'd like to know who gained what.
Wouldn't you want a more "backfire-proof" manifold if you are spraying a shot that large? If you grenade a FAST90, thats is some expensive plastic pieces flying through the air. I am just just curious more than anything. (I recently went with a ported Victor Jr and aluminum elbow when I installed my second stage).
There are several threads on the gains with a FAST intake. The gains all seem to be minimal compared to the price.Just my opinion.
https://ls1tech.com/forums/showthrea...+fast+manifold
There are several threads on the gains with a FAST intake. The gains all seem to be minimal compared to the price.Just my opinion.
https://ls1tech.com/forums/showthrea...+fast+manifold
Wouldn't you want a more "backfire-proof" manifold if you are spraying a shot that large? If you grenade a FAST90, thats is some expensive plastic pieces flying through the air. I am just just curious more than anything. (I recently went with a ported Victor Jr and aluminum elbow when I installed my second stage).
There are several threads on the gains with a FAST intake. The gains all seem to be minimal compared to the price.Just my opinion.
https://ls1tech.com/forums/showthrea...+fast+manifold
There are several threads on the gains with a FAST intake. The gains all seem to be minimal compared to the price.Just my opinion.
https://ls1tech.com/forums/showthrea...+fast+manifold
dont think worht the gains What other engine mods, I dont think it will be worth the gains that you would expect, staying with the Ls6 intake you will get better air velocity and better tq out of the hole to get the car moving, I would go for more tq than the hp that you would see from the 90 setup since you are using spray.
In this month issue of Gm high tech has a article of the 92/92 setup and you can see the gains are up in the 6500rpm range and really dont come in until 4500rpm and this is on a NA motor not sprayed. And by the way I do see alot of dyno numbers and tq curves, I have my own personal DYNO in my garage do my own tunning and help alot of my freinds out I would stay with the LS6 since you are using spray if you do change it out post your before 1/4 mile run and after intake change.
In this month issue of Gm high tech has a article of the 92/92 setup and you can see the gains are up in the 6500rpm range and really dont come in until 4500rpm and this is on a NA motor not sprayed. And by the way I do see alot of dyno numbers and tq curves, I have my own personal DYNO in my garage do my own tunning and help alot of my freinds out I would stay with the LS6 since you are using spray if you do change it out post your before 1/4 mile run and after intake change.
What other engine mods, I dont think it will be worth the gains that you would expect, staying with the Ls6 intake you will get better air velocity and better tq out of the hole to get the car moving, I would go for more tq than the hp that you would see from the 90 setup since you are using spray.
In this month issue of Gm high tech has a article of the 92/92 setup and you can see the gains are up in the 6500rpm range and really dont come in until 4500rpm and this is on a NA motor not sprayed. And by the way I do see alot of dyno numbers and tq curves, I have my own personal DYNO in my garage do my own tunning and help alot of my freinds out I would stay with the LS6 since you are using spray if you do change it out post your before 1/4 mile run and after intake change.
In this month issue of Gm high tech has a article of the 92/92 setup and you can see the gains are up in the 6500rpm range and really dont come in until 4500rpm and this is on a NA motor not sprayed. And by the way I do see alot of dyno numbers and tq curves, I have my own personal DYNO in my garage do my own tunning and help alot of my freinds out I would stay with the LS6 since you are using spray if you do change it out post your before 1/4 mile run and after intake change.
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Do you have a forged bottom end and built up motor? i have to assume that if you are even thinking of running a 300 shot. In the event it is a beefed up NA motor that i guarantee you are losing a big amount of power with the LS6.
im on roberts side about the vic jr. you can achieve very comparable results with the ported vic against the fast 90 at a lower cost. you do lose some low end power, but if you are pushing a 300 shot i doubt your spending much time below 4500 so it doesnt really matter.
hey robert, we plumbed my vic jr today.....you gonna **** your pants when you see this puppy
im on roberts side about the vic jr. you can achieve very comparable results with the ported vic against the fast 90 at a lower cost. you do lose some low end power, but if you are pushing a 300 shot i doubt your spending much time below 4500 so it doesnt really matter.
hey robert, we plumbed my vic jr today.....you gonna **** your pants when you see this puppy
yes. They flow fairly well right out of the box, but i would recommend at least port matching if not a full port job. The fast 90 is a superior manifold, im not debating that. the fast and vic jr dont become comparable until you are running low tens or quicker. like i said, depends on the rpm range you see. A head/cam 400 rwhp would suffer big time down low with the vic jr. The actual problem with these intakes really isnt the intake themselves. Normally the elbow is the problem and the point of poor airflow and restrictions.
So, say I'm running high 9's on an LS6 manifold on a stock cubed car. What do you think, 90 or the Jr? The reason I ask is because I can probably do the 90 this year, but there is a ton of stuff to buy if I were to go with the Vic
Depends on your budget. In that time range you’re not going to find a lot of differences between the two. Especially if you do a SD tune and run a 4150 flange throttle body instead of the elbow. Heat dissipation is more of an issue with the Vic vs. Fast 90, obviously the composite is far superior to the aluminum. But if you’re really just bringing it to the track and letting it cool down between runs, it really is not a big deal at all. One of the bigger reasons people go with the Vic is because back fires do occasionally happen. Seeing a 900 dollar intake explode makes me nauseous. you may bend a throttle body blade but your intake is going to be there after. Also, the price difference has to be considered.
Do you have a forged bottom end and built up motor? i have to assume that if you are even thinking of running a 300 shot. In the event it is a beefed up NA motor that i guarantee you are losing a big amount of power with the LS6.
im on roberts side about the vic jr. you can achieve very comparable results with the ported vic against the fast 90 at a lower cost. you do lose some low end power, but if you are pushing a 300 shot i doubt your spending much time below 4500 so it doesnt really matter.
hey robert, we plumbed my vic jr today.....you gonna **** your pants when you see this puppy
im on roberts side about the vic jr. you can achieve very comparable results with the ported vic against the fast 90 at a lower cost. you do lose some low end power, but if you are pushing a 300 shot i doubt your spending much time below 4500 so it doesnt really matter.
hey robert, we plumbed my vic jr today.....you gonna **** your pants when you see this puppy
Hot Rod mag did a back to back with the Vic Jr and really only a couple HP was lost down low, not as bad as everyone thinks. Not enough for anybody to notice, IMO. The other thing about a backfire, not just a big $$ plastic intake, but if the back fire happens and it dislodges the fuel rail, well many have burned to the ground and that's my main reason. I was lucky before, and prepared now. they also have the baddest look going and do perform up top better than the front entrance stock style intakes.
Robert
I switched from a ported FAST intake to a ported Vic Jr and a sheetmetal elbow (tall one from Aaron, not the restrictive one) on my 383 and the first time I drove the car I noticed one difference immediately. In the higher revs, the car seemed to keep on pulling to 7000+ rpm. With the FAST there was a noticeable slowing of the rpm gain once I hit 6000rpm. I didnt notice any losses down low on the seat-of-the-pants dyno, and I can still spin 1st-3rd easily. Now, the only things stock in my engine are the rockers, so your mileage may vary. My primiary motivation for the switch was backfire safety. Besides, when you pop the hood, it looks badass. 
Last edited by Goldfinger911; Jun 30, 2008 at 07:27 PM.
What would be the possibility of using my HSW plate with that elbow? Anyone see distribution issues? I will probably be going this route for next year with a direct port along with the plate.
Back in 05 I posted a step by step install using the Victor JR with results on my heads and cam 99 SS. The victor JR is a great choice for big cubed high RPM race motors. They work very well with nitrous expecially with our spray bars plumbed in. On a average motor like my heads and cam car was the Victor JR is actually going to still performance over a fast 90. The Victor JR intake will out flow the fast on the top end but you loose the down low. On a average street car you want that down low and mid range torque. I would suggest the Victor JR on applications with large high flowing top ends and big cubes that turn 7000 pluss RPM.
Dave
Dave
Alright, I'm completely convinced . I will have a victor Jr setup by Labor Day. I'll put all the speculation to rest concerning stock cube cars ant these intakes with some back to back track #'s. Hope the wife is ready for this
