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.

 

Subzero does or did

 

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.

 

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

 

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.

 

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

 

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.

 

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.

 

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?

 

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?

 

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.

 

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.

 

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?

 

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

 

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.

 

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.

 

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

 

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