Quickin

I searched and nowhere in the stickies could I find it.

I spoke to OFI today but forgot to ask this.

Is there a chart of some sort that will tell you what cubic inches you need to match perfectly to a certain sized turbo? There's probably more to it than just ci and a certain turbo, right?

For example: if you use an S91, what cubic inches would you use to have the best efficiency?

ALSO....is there a chart that tells you how much HP each different sized turbo can max out at?
I'm curious about the S91 and the 101mm sizes. OFI told me today they are working on making a 101mm fit with their current kit, if they do I'll get their kit because it retains A/C. I can do the S91 for now until it happens.



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mahhddgtp

Dude, there are so many variables to all of this. Sometimes the same sized turbos make different power.

The reason you don't see a chart for CI to turbo size is because of the different variables... Hell, you can put a S91 on a 427 and on a 370... What you'll be able to get out of it depends on your cam, how high you rev, backpressure, etc.

I'm just scratching the surface here... The answer to what turbo for what size motor: Experience.

I don't even know why I responded I'm now subscribing for non-educational purposes

CHRIZ28

iTrader: (15)

I'm wondering the same thing. I'm having a forged 408 built with 9:1 compression and L92 heads. And wanting to do like a twin GT45 (66mm) setup off of truck manifolds, and was just wondering if that was enough, or too much turbo. Thanks

Chris

DrTurbo

iTrader: (3)

OFI wants to use our new FI91X which goes to 100mm and using all new ETT wheels. The S91 will be a good bit smaller though then the FI-X series. Keep your eyes peeled this week, since I think pictures of new 91-100mm FI-X units will be posted.

DrTurbo

iTrader: (3)

The GT45's are laggy since they use a big turbine wheel and also are 1.08A/R units.

Quickin

Yeah, I have an LSX block already and my builder was asking me these questions today. He was like, "uh, you can't just toss a any ole' turbo on any ole' engine and HOPE it works together perfectly." He told me to call them back. I was like...I have no clue about all this. I spoke with OFI today but forgot to ask questions about how I should have my engine built to match the turbo. I just thought I'd ask here, but I guess there's a million different variables. I'll have to talk to them tomorrow.

Besides, I'll probably get more useless posts then helpful ones.


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Quickin

I just want the largest turbo that the OFI kit will handle. I was told today by OFI that the S91 will make 1,575 fwhp. I want to know what a 100 or 101mm will make.

My builder said he wants to build me a 408 with my LSX, or a 422 at the biggest if I'm gonna use a turbo.


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CHRIZ28

iTrader: (15)

So I'm guessing look elsewhere...lol. I see alot of people going with a single T76. The Turbonetics T76's aren't too bad price wise. I figured there was a reason the GT45's were so cheap.. Thanks.

Chris

DrTurbo

iTrader: (3)

The new FI-98X unit will be good for almost 1950-2000hp...lol. I would stay with a engine around the size of a 370-400ci. Pressure ratio is your friend.

ls1408cp

iTrader: (37)

how big is it? Price?

Quickin

Thats what my builder said, 408ci or so.

Magical question is....will it fit with the OFI single turbo kit? Do you know if the dimensions will be the same or smaller than the S91?


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DrTurbo

iTrader: (3)

Very similar in size to the GT55 which is the direct competitor to the unit. As for pricing.....should be around 2400-2500.

firehawk123

do you have any pic for it and when its going to be out .

DrTurbo

iTrader: (3)

Pics and info will be out soon. They will probably not be available till after the turn of the year. Only the prototype units are out right now.

Quickin

Well...........is the GT55 the same outer dimensions as the S91?

I just need to know if it'll work with the current OFI turbo kit?

If it will I'll get the OFI kit ordered right now and wait till the FI-98X comes out.

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ninetres

iTrader: (35)

So overkill for a DD streetcar with A/C lol. But go for it!

Mekkadon

iTrader: (3)

Well, there are some Viper owners that would say otherwise

He can always turn the boost down if it's too much for the street.....right?

smokinHawk

iTrader: (48)

not the S91 is on a GT42 frame which is a bit smaller then a GT55
some info on a gt42, the s91 uses the same casing http://www.turbobygarrett.com/turbob...2_731376_2.htm
some info on a gt55 which FI says there new FIXX thumpers will be using http://www.turbobygarrett.com/turbob...3_752052-9.htm

DrTurbo

iTrader: (3)

Yes the S91 is smaller and closer to a GT42 chassis. The FI-X chassis is closer to the GT55 which is larger overall. As for fitting on a OFI kit, that would be up to Joel. These units spool much quicker then the larger thumpers, and put down awesome numbers.

Quickin

My car has been my DD since I bought it in 1998. It's not going to be anymore. I will drive it maybe 1-2 days a week after I set it up this way. I'm buying a new car in a couple weeks that'll be my new DD.

I want this car to be a show car with huge power.


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