Rather than cluttering up AMS's thread about this turbo, as I know I wouldn't appreciate them doing it to me, I decided to start a new one.

Very simply, just want to post the dyno sheet, from our black drag EVO.

Below you will find the dyno sheet running the Forced Performance HTA88 turbocharger. Some people call this turbo the HTA37r. Call it whatever you like, they are the same thing.

This turbo was in a T4, single scroll, .84 turbine housing. Peak boost was 47 psi and there was NO wastegate on the car.

In the T4 housing the turbo hits 20 psi at 5600 rpm. There is nothing in the entire combination of this car that is meant to make low/mid range power. It has cams in it geared for nothing but top end, the intake is geared for top end, 3" i/c pipes all which add lag to the combination.

The same turbo in a T3, .82 single scroll housing will make 20 psi at 4930 rpm on a 2 liter. On a 2.3 I've had this turbo make 20 psi at 4600 rpm.

There is a 4 whp difference from the peak power of 727 whp at 8,000 rpm until the 9,000 rpm limit of the dyno run. Boost at 9,000 rpm was 45.19 psi.

The turbo will make power at 9,000 rpm, obviously. I do not tune our black car on the dyno, it's too loud and it fills our dyno building with fumes, which make me sick. I get it close and tune it at the track.

The car with this dyno graph ran a best of 8.92 and 166.37 mph.

 

In on the first page for this discussion.

 

No wastegate....sweeet Good info dave.

 

very good info there David.....

 

I think its interesting that power doesnt dropoff without the wastegate. ALL the exhaust gases are able to exit the turbine without causing excessive backpressure.

Interested to hear about the Other turbine wheels being talked about. My supra friend put down 800+ on a GTX wheel. Supposedly it spools like P trim but flows much more.

Is there a smaller "better" wheel that "flows like a P trim" but spools faster?

I dont buy the gt42 spooling just as fast as a t67 P trim.
I spool 800 rpms faster with a .63 t3 4 bolt housing journal bearing then my friends gt3582R ball bearing with t31 .82 hotside. i think with a .82 I would only spool 300ish rpms later. I am pretty sure a gt4294 on my car (converted to a t4 flange) would spool 1000+ rpms later (probably even slower since I wouldn't pay 2500 for a BB).

Maybe if you install a huge t4 housing that doesnt really match the turbo and compare it to a twin scroll gt42 they are close....but thats a stupid comparison. Why would you put a 1000+ hp turbine on an 800 hp compressor and compare it to a turbo that is well balanced?

It would make sense for racing since they often have inducer size limitations (so you need to run the biggest turbine that still gives you a powerband) but not for bragging about which turbo is better. Thats a Straw Man argument (unfair).

Buscher...with the standard 67's small excuder size....do you suggest not even bothering with 40psi boost levels...or just letting the turbo produce whatever it will produce, reliability to the wind? Obviously 30-40psi on a 67mm turbo cant be used very often (no stop and go traffic lol) so not many miles would be clocked at those insane loads.

 

Thanks David.
I agree I was starting to clutter up AMS's thread.....but you and Al have tested the .82 backside of this turbo...and AMS never updated the original thread on there findings of the original .63.

Thanks again for posting the above information. It's good to know the .82 spooled 20psi under 5,000rpms.

As always your input is greatly appreciated and thanks for sharing the dyno graph.

 

Keep in mind this is a T4 .84 housing on this turbo, NOT a T3 .82 or .63.

 

T3 .82 Housing pump gas...

 

Thanks jeff. Much better spool on your car as can be seen in the graph. T3, .82 turbine.

 

Old thread bump... and a question for Dave...

New turbos have hit the market since this thread started,,,If you had the same exact combo on the black car today, what turbo would you choose?

 

I'm glad somebody bumped this. I didnt want to be the one.

 

Well considering I was going to build a new drag car I bought a new turbo, it's a new billet GT42r based turbo from FP. I have now decided not to build it and it's here for sale

 

why not just put it on the RS to see how quick you can go instead of building a full drag car? cost much less and its just a turbo kit no?

 

Now you are talking!!! Please pm me the price!!

We were thinking of going big on a current project and this is "right up the alley".

 

I also have the HTA3794 on my Twin scroll evo and I am at 750 @ 38bs it spools late. Could be due to me being in CO and it's with a 1.00 housing. I am on a 2.3 But when the turbo spools, jesus hold on. It hits hard.