Ryde _Or_Die

Well how much lag can I expect from a t-72? Is it worth going with if I plan to run 16psi on the street and 20 on the track? Just wondering if anyone runs this on a street car with a 13b streetported. Thanks.

modrx7

iTrader: (1)

Subzero does or did

1revn3rdgen

iTrader: (27)

I know some guy running a t-72 on a rx-2 just that he has a bridge port on it but it is a street car.I'll ask him about the lag but that thing pulls like a mf i like it.

Ryde _Or_Die

Well my car has a fairly aggressive streetport from what my mechanic tells me. Not BP though

Infini IV

Is the T72 considered a large frame turbo?

What turbine housing A/R does the T72 have? I think the T72 is similar in size to the HKS T51... so I'm pretty sure you can base what you expect out of this turbo from that.

Red-Rx7

Here is an example of the Innovative T72 turbo compressor map (ignore the line through it, that was my engine airflow):

Ryde _Or_Die

Well I'll be getting 3 housings, .81, .96, and 1.00. They are all divided and come with a custom SS tubular manifold and HKS GT wastegate. Does this setup sound good for street use and pump gas? Thanks alot.

pillage6

The T4/T76 I have spools up to 14 lbs. by 3.5k, which I don't think is bad, and that is with a .96 A/R. Stock 87 13B block, so I would imagine that you would spool up comparatively. Not to mention that I have a carb, so your EFI system might be more efficient and spool up faster.

Ryde _Or_Die

Thats good to hear. Well I have a large streetported 13B, plus I'll be going with a .81 AR I think since its a streetcar. Also, the T76 is larger than the T72m correct?

Red-Rx7

Yes.

Here is the airflow map for the T76 from Innovative. The T76 flows at any given point about 10lbs/min more (again, ignore the drawn line through the map):



Also, where are you getting your turbo from?

Ryde _Or_Die

Looking at the compresssor map, how can I tell when the turbo would spool? (sorry, never gotten into readings comp maps since I wasn't getting a turbo anytime soon)

I'm getting it from a guy who has a shop in Cali. Its a Turbonetics T72, not sure if that is different from an Innovative or not.

Infini IV

If it's a .81 turbine housing, it is most likely collected (not divided). I don't think you can read how soon a turbo will spool just by looking at a compressor map. Remember, it's a map of just the COMPRESSOR side of the turbo. Although the size of a compressor wheel plays a big role in deciding spool-up time, manifold design, porting, turbine-side options play a HUGE role in determining how soon or when your turbo will spool-up by.

Here is some info... An HKS T51R Kai uses a 70.3mm inducer and 94.0mm exducer. The Turbonetics T72 I believe you are looking at uses a 72.1mm inducer and 102.3mm exducer.

Ryde _Or_Die

So this will be a beast to spool huh? I haev been having a tough time deciding what turbo to go with. The only reason I was looking at this one is because of the price. $1500 for the turbo, custom SS manifold, HKS gt WG, 3" SS DP and all the oil lines. Maybe I could buy it and sell the turbo and get another one. What turbo is smaller than this one but can produce better numbers that a 60-1 T4?

95R2-89TII Ground Zero

Isn't AARotary running a T-78 on the street?

Infini IV

62-1, T66, T04R, T70, S300, PT67(GTQ), T78 among many others... As a very general way of looking at it, look for any turbos with an inducer larger than 60mm and smaller than 72mm.

Ryde _Or_Die

A t-78 is too much money, as is a t-66. Both over $1000, more like $1500. I can get a 62-1 for $600 brand new.

Bond

T78 i believe is actually a bit smaller than a T66. Last i had checked i thought only greddy was making a T78 and T88 ( not based on garret dimensions). Its been awhile so i could be wrong. Anyway, im using a T66(garret) with a Q trim turbine wheel on .81 a/r. The other day i turned the boost up and hit 20.4 lbs at about 4700 rpms.

mike

Infini IV

I think the T78 is also 66mm inducer, but a slightly smaller exducer. I can't remember specifically.