The ITB will place a Vic jr under a rock. Seeings how they don't use alot of the same things we use in Aussie, I doubt your going to find direct comparisons. The one graph I have shows a 427 with a 242/242 XE-R gaining 72 rwhp over the FAST 90, intakes being the only change. Also, as mentioned above, you can run a much more aggressive cam with these intakes, also resulting in more power.

 

when I see it beat a ported victor jr by 40hp I will buy two

 

Technology>Old school. There are alot more advantages to the ITB than just HP. How much do you think your Vic jr. is worth over a ported FAST 90? Maybe 15hp if that?

EDIT: Since search was working, I did some looking into the old carb style intake. Seems they aren't all that great for the trouble. From what I saw, this would be the order of performance:
Stock FAST 90
Vic. Jr.
GMPP style
Ported Vic.
Ported FAST
Ported GMPP.

Depending on the level of porting that went into the Vic., I'm very shure that it could out do a ported FAST. Of course this would require cutting the manifold open and making sure you got to every knook and cranny. That being said, I'd feel very compeled to say that a 55mm ITB could smoke a Vic jr. by more than 50hp on a race app. Of course that's JMO, and I've been known to be mildly retarded at times.

 

A ported victor is worth alot over a fast90. I have et245s and every dyno with them and a fast 90 the motor falls of early. My intake was never cut a part but it pulled to 7400 and never fell off. I didnt want to turn the motor any higher. It is also a hydraulic cam. I will buy one if I see results but I might not have enough head to need one. The main thing that I like about this intake is the air doesnt have to turn as many times like the victor. I will decide when I see some results if its worth $3500 to try.

 

These are Dyno Sheets from the same car, one with throttles one with out have a look, also please note that this is a road rally car used for a type of racing that needs Max drivablty and the owner didn't like the idea of going inside the engine.

 

So you are saying the rest of the engine was a stock ls1? Can someone explain that graph to me. I dont think I am reading it right.

 

it looks wierd as hell, but it looks like the itb's make a big jump from a single tb

 

Show me the money. Run a ported 90 mm fast setup then swap intakes and install the proper tune and rerun same dyno, same day and post those results. That is what everyone here wants to see. A true before and after. Do you have that kind of information? I big jump in hp/tq would truly justify the 4 grand you are asking.

JMO

 

Like I said before, I had a graph of the 427ci with a 242/242 XE-R and LS6 heads. It went from a stock FAST 90 to the 52mm ITB and gained 72 rwhp. This was on a moderate set-up. Something like my set-up , with the 55mm, can gain even more. I believe the other graph I had was of a stock car gaining 30 rwhp over the LS6, but this was a bone stock, no mod car. A fast 90 on a stock car has shown to gain nothing. Gains were across the board, not just peak. I wish I still had the graphs, but my hard drive crashed last week and all info was lost. I'm in the process of trying to get it recovered now and will post up if they are retrieved. One thing is for sure, these intakes are no joke, they just cost to damn much for the average guy.

 

who is doing the testing?

 

hockos how does your intake compare to the harrop?

 

hockos were you at chasing kangaroos or what

 

Let us know when you have the dyno results..

 

When will you guys understand that ITB intakes are by no means new? They have been around for decades and will continue to be around for decades because they pick up power everywhere over any other manifold.

LS1408, I wouldn't be surprised if you gained 40 rwhp over the ported vic jr. I am not going to scrounge around on the net all night to backup my evidence on why these are worth 4 grand. Hell do a google search and you'll come up with all the info you need. 500 rwhp heads/cam cars are abundant in OZ land, you wanna know why? ITB's baby!

Nate

 

this may be an off topic question, but can you run direct port nitrous setups with these intakes? i am by no means in the postition to buy on of these badass intakes or a direct port setup(im running the college cam-125shot), but maybe in about 3 or 4 years after college i could be in the position for a 408 or whatever crazy **** they have then. any nitrous info o this intake vs single intake?/

 

I know of at least one member running that type of set-up: https://ls1tech.com/forums/conversions-swaps/337932-pictures-my-ls-1-hybrid-look-intake.html



--JMarsa

 

I have been searching for info for four days and pmed almost everyone on this board that has had one. I have used every search engine known to man. So were is the good info no where. The beast guy on here has the only normal dyno sheet on one which sounds impressive but lost somewhere on his hard drive. I even have been trying to join a board in aussie land but the email to activate my account wont come though. Dont tell me I havent tried fucko.

 

What exactly is it that you are looking for 408cp? Just dyno sheets? Good news on that BTW, the hard drive is being recovered as I type. I believe it will be salvageable, then I'll post the graphs. I'm a member on the Aussie forum under the same screen name. You'd be surprised how much info you won't get over there. Some of th ethreads I made went unread. The best thing I did was e-mail Harrop directly. If you get in touch with Damian, he can send you some dyno sheets. Probablly the same ones I have.

 

I would go with the harrop if the price didnt go up. I will most likely go with the hockos intake but need more info. I will sent this intake to cary at et or Bryan at LME to port it. I dont think it will be a disappointment.

 

I am mainly looking for dyno numbers with specs on the car like cam, heads, and cubic inches. The dyno you have is a car with ported ls6 heads so my et245s should flow a little better resulting in more of a gain so I am not scared to buy one. I would like to find one used but I think it will be impossible.