3794 really seems to like high boost. I didnt beat my 3586 until past 38psi though I was at 4* less timing peak.

Aaron

 

Here is the log, its kinda messed up.



Based on the logs it looks like you may have some clutch slip going on.

 

Man these turbos are impressive - out of curiousity, what was/were the previous turbos?

 

okay now i see what you meant from your PM, lol.... yeah this is what i was talking about on my post. Right when the car gets into boost in 3rd gear all 4 tires spin like mad and hop a little. Its pretty violent and then settles down for the rest of the rpm pull. When i have 3-4 people in the car it doesnt do it at all and pulls clean. Im on crappy falken azenis tires that are 2yrs old. The clutch is fine, its a carbon twin and definately not slipping. Barely have 1k miles on it anyways.

Thanks for running it through Virtual Dyno for me. I'll try to get a better log w/ some traction. Unless i have time to rent out a dyno soon, then i'll get a log and compare it to the actual dyno print out.

We might hit the track tomorrow (weather permitting) so maybe i'll have some trapspeed data as well. Although I dont have proper tires, so the data may be a bit skewwed from the track, lol.

 

Hey Aaron,
yeah compared to the HTA86s on other evos at the shop it comes on a tad bit later, but after we put in some timing adv it changed the curve quite a bit. Spool improved alot. Seems (for me at least) the hp was the same up to around 30psi or so. Then the HTA94 started to (marginally) make a lil' more up top at high rpm.
But basically this is all speculation based on a few datalogs and virtual graphs. Ill try to get more concrete data soon.

thanks for the SD help on Huy's stroker evo btw!

 

previous turbos on this car:

Precision 7075 T4 - 802awhp 40psi (local Mustang Dyno)

Garrett GT4094r T4 - 737awhp 40psi (local Mustang Dyno)

both made pretty low torque as well, typical of larger turbos. The pte7075 powerband was really nice on the highway but tricky at the track. RPM range was 7k ~ 10krpm.

The HTA94 is making similar whp(at least on VDR etc) w/ way more torque and bringing the powerband to a more rev friendly 5800~9000rpm range. Although its only at 35-37psi right now. From the looks of it, at 40psi+ it should do better i think.

 

So im wondering how much more power is expected from this turbo over an HTA86.

 

Try 4th gear.

 

the HTA86 is definately more street friendly. But since i am coming from much larger turbos, the response from the HTA94 is really quick for me, LOL! Im sure my opinion would be reverse if say I was coming from a 35r. I tend to do things backwards

From what i've experienced... the HTA86 (no matter how much power you squeeze out of it) is still a 35r turbine and it does drop off after lets say 8krpm or so on a 2.0l. Im sure sooner on a stroker. The HTA94 will continue to build power after 8krpm easily due to its larger 37r turbine and of course higher flow compressor. (the lag is the trade off here)
The key thing here is how far you are willing to push either turbo. An HTA86 pushed to the limits will compete right up there w/ an HTA94... but push the HTA94 equally hard and it will make more power up top eventually. There IS a broad range where both make similar power at same boost levels. Just in different rpm ranges.
But this is in a mediocre boost setting etc.
Again, this is just MY findings on both turbos that a few of my friends have accumulated experimenting w/ setups. So take it for what its worth, lol

 

thats a good idea, lol...

 

Awesome, cheers for the info - sound like a really nice turbo! Look forward to hearing how it goes with 40psi

 

Taking my advice I see . Running a smaller turbo and going faster . Torque really does make the car pull and with that 70mm you had none. I sure you'll be happy with the 37r even though it's still very laggy compared to an hta86.

 

how much lag difference from the 3794 to the 3586?

 

Thanks for the info. I'm still putting the car back together and I've been wondering if the 3794 was the wrong choice. I ordered mine with the 1.03 TiAL vband housing. I plan to ring it out til it stops making power. 45+psi. I have yet to see someone do this. My goal is to hit 800 on my Mustang Dyno

 

well, between all the evos here at my friend's shop there are 3 HTA86 evos built and they were/are awesome on the street/track. From my experience, the lag difference is very minimal. HTA86 actually lags for a 35r compared to an HTA82 or 6262. Add a few hundred rpm worth of lag and you get the HTA94. But you have to consider you also get maybe an extra 1krpm or more of useable power up top where the HTA86 starts to fall off. I like the compromise myself. You get the same top end power of a 70mm turbo but w/ better response.