hosrom_951

Watch the speedo when boost "hits" at 6k+rpms

hally

So has anyone got a dyno chart of a Turbonetics T04E w/ 50 trim compressor wheel and #8 hotside.

J Chen

hally,
PM Rage, he use to run one & I remembered that he
made very good power from it. BTW, this is really
a very safe buy. Among the 4E's the 50 trim has the
best overall flow much better then the 46 or 57 trim.
A friend of mine is using one but with Super 50 trim.
Very very good.

rage2

Pauerman is correct. It was a clearance issue. Using a E36 M3 TPS now.

rage2

I ran a 57 trim on the 951. The 50 trim is a way better compressor (from the maps anyways). Not much loss in peak flow, but way better everywhere else, similar to the "Super" series.

I do have a 50 trim turbocharger in my garage, but it's going into my Civic racecar.

Pauerman

I thought so Rage.

The super 50 moves you away from the surge limit but also shifts the high RPM points to lower islands of efficiency.

I've been looking at the 46 trim and 60 trim and found that the lower RPM points were on or passed over the surge limit. I used these values to calculate flow: 3000RPM, 85%Ve, 2.5L

Pr 2.0 = 15.84 lbs/min
Pr 2.2 = 17.42 lbs/min

Does anyone else see this? Are my numbers off? With all the guys that run the 46 and 60 trim, never hear much about compressor surge.

I thought the 2V head flowed more efficiently at lower RPM's which is why they produce more torque down low compared to 16V heads. Chen doesn't seem to thinks so.

jimbo1111

Could you plot this map for me Pauerman. I would like to see how efficient this wheel is. Thanks

Tomas L

Why do you use 6500 rpm? The airflow will be highest close to the max power rpm and that should be somewhere around 5500-6000 rpm for an unmodified 951 engine. Above that rpm VE decreses faster than rpm increases thus air flow will decrease.
85% VE may be correct at 5500 rpm but hardly at 6500 rpm. Does anyone have data on this?

rage2

If the timing is setup properly, peak power comes up later. I made my peak HP at 6600rpm or something on my 2.5L.

Dave E

What is compressor surge and what are the effects of it?

Pauerman

Jimbo, T-61 right?

I'll keep the high RPM points at 6500 (thanks for your input Rage) and Ve @ 85%. Low RPM points will be 3000 and same Ve. All lbs/min values have previously listed.

Here you go.

RogueM3

Wow..thats very efficient.

hosrom_951

You don't see the first two plots OUTSIDE the surge?

NZ951

Rage, do you have a timing map handy that you run based on MAP?

J Chen

Jimbo,
That turbo is too big. You won't see any meaningful
power till at past 4500 rpm, It's o.k if you are planning
on running at 6500rpm all day long.