Tuesday, 20 November 2012

FP Turbos HTA3586, HTA3082, HTA3076 comparison

In the never ending search I always seem to be on to find something better I ended up in some turbo testing this week.

My car for the basics runs:

BR2.3 RPM engine
BR Stage 3 head
BF272 cams
BR double pumper
ID2000 cc injectors
BR upper and lower i/c pipes
BR Forward Facing V-band turbo kit
Tial wastegate and Tial BOV
E98 Fuel

I have been enjoying the hell out of my car all year with this combination. By far the best combination I've ever had in the car. I've only had it on "low" boost so far, max being 35 psi and that was during this testing trying to set boost when I made changes. The car is a beast and still has enough low end to manage to autocross it and do fairly well, I'd actually say the alignment/tire choices I have used for autocross is a bigger handicap than the power delivery which is pretty darn good.

OK, to the testing the three turbos used were:

Forced Performance HTA3586 with a Tial .82 turbine housing
Forced Performance HTA3082 with a Tial .63 turbine housing
Forced Performance HTA3076 with a Tial .63 turbine housing

Below is the dyno chart from the three turbos. I printed the sheet so each turbo has it's own color. Red=HTA3586, Green=HTA3082 and Blue=HTA3076

**I'd like to be able to do a nice spread sheet for all this, sorry, don't know how to do it.

More facts.

HTA3586, peak boost was 33.1 psi, at 8,000 rpm it had 32.7 psi. At 3,000/3.2 psi, 3,500/7.2 psi, 4,000/14.2 psi, 4500/28.3 psi, 5000/32.3 psi

HTA3082, peak boost was 32.7 psi, at 8,000 rpm it had 28.9 psi. At 3,000/4.8 psi, 3,500/11.2 psi, 4,000/23.5 psi, 4500/32.2 psi, 5000/31.9 psi

HTA3076, peak boost was 34.1 psi, at 8,000 rpm it had 27.3 psi. At 3,000/5.9
psi, 3,500/13.7 psi, 4,000/29.9 psi, 4500/33.1 psi, 5000/32.4 psi.

More information of interest.
This is RPM, then turbo, then TQ/HP

2500 rpm, HTA86, 115/57
2500 rpm, HTA82, 125/62
2500 rpm, HTA76, 125/62

3000 rpm, HTA86, 133/76
3000 rpm, HTA82, 144/82
3000 rpm, HTA76, 153/87

3500 rpm, HTA86, 181/120
3500 rpm, HTA82, 207/138
3500 rpm, HTA76, 233/155

4000 rpm, HTA86, 281/214
4000 rpm, HTA82, 342/260
4000 rpm, HTA76, 414/315

4500 rpm, HTA86, 456/390
4500 rpm, HTA82, 482/410
4500 rpm, HTA76, 520/440

5000 rpm, HTA86, 540/510
5000 rpm, HTA82, 516/486
5000 rpm, HTA76, 529/499

5500 rpm, HTA86, 546/567
5500 rpm, HTA82, 513/532
5500 rpm, HTA76, 522/542

8000 rpm, HTA86, 458/679
8000 rpm, HTA82, 389/579
8000 rpm, HTA76, 378/563

OK, those are the technical facts of the test. Some side notes. The boost was adjusted to get them equal. I went a little high and then a little low on the HTA3076, I figure for the test it was close enough. Each psi was giving me about 10 hp/ft lbs. So figure from there if you are unhappy with the 34 psi on the HTA3076. At 35 psi it made 577 peak. The AFR's were set at 12.0:1 across the board from 3000 rpm up for each one. I did have to pull a few degrees of timing through the mid range on the 3082/76, it didn't like the smaller turbine wheel with the timing I was running.

We are doing one more test today by Robert's request. The car is having an .82 turbine housing put on the HTA3076 right now. He feels the spool will not be effected and the power is going to climb.

In my opinion, based on what I am seeing the HTA3076 is a better match than the HTA3082, the low/mid range is great and the power up top is minimal that is being lost. Both turbos carry enough power all the way past 8,000 rpm that you could run the cars that high if need be and benefit. Shift points wouldn't need to be past about 7,000 rpm for the car to ET well but in 4th to cross the traps letting the engine rev would benefit it.


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