WTF!?!? Very surprised by the results! Care to elaborate on what the restriction/limiting factor was?

Was the billet grill left on during dyno runs?

 

yeah this doesnt seem right.....

 

how is this right??? VAZZ made more hp on a stock motor with same turbo i think with no return.

 

This dyno was done with the T4 BB 6765 .81a/r (that was a free upgrade do to results), so yes this does not make much sense. I am looking at a larger FMIC at the moment, so that should help with IAT's.

This engine is built, however it has stock cams/heads and stock headers. We suspect that the OEM headers may also be causing some issues, as they have an 8" section of 1.5" tubing.


binder made 463whp on this same dyno with the identical kit (minus BB) at 13psi, he however had cams and aftermarket headers.

 

........ the intercooler? the intercooler is huge....

 

sasha the thing that I am confused about is how built motor is only making 10hp more than vazz car with stock motor, stock headers and no fuel return at i think 13lbs. All i think he had was a plentum spacer and dw800s. If this is the case im scrapping my built motor

 

.....

 

I also noticed on the dyno chart that power drops off significantly after 5000RPM. Even with stock cams and stock exhaust manifolds, it should make more power and hold it to at least 6000RPM ...ESPECIALLY with a T4 turbo of that size! Something is wrong IMO. I hope Hal provides more info and insight.

 

Compression has a bit to do with it, but also keep in mind that this dyno reads rather low. Hal just finished a 4.15L stroker with the APS extreme kit, and the car made 515whp at 16psi of boost.

Also, speaking of Hal. I would just like to thank him for all of his efforts with this build, as it has been trying at times. He went above and beyond and out of his way to see if he can find anything wrong with the kit or the built engine.

He concluded that a larger FMIC would be a good improvement, as well as a heat shield for the air filter. These are all the things that I am working on right now.

At the moment this is the leading candidate for a replacement FMIC:

Core Dimension:
3.50'' thick x 18.48'' wide x 9.0'' tall
Hose Connection – 2.50'' OD
760HP



This at least is a proven FMIC brand, so there should not be any issue with that.

 

I dont know why the IC would be small.. its huge and flows plenty.. my IATs were as low as can be.. and nothing is wrong with the motor?

 

That explains it, any idea of when next candidate will be finished?

 

Correction, the stroker kit made 543rwhp :P which is only limited by fuel (aps fuel injectors suck).

However, this dyno does read a lot lower than most. Russ at Momentum can tell you who had the lowest dyno numbers from all the shops he visited with his kit.

 

Sorry, my mistake. I just remember reading your thread and seing the 515whp and 16psi.

 

Sasha,

Do you know if the front bumber was on during dyno runs? And if so... Was the billet grill seen in the OP still on the car?

It looks like that billet grill would be quite obstructive to airflow to the intercooler.

 

no it was not on during dyno runs...

 

Thanks for clearing that up.

Can you provide any further insight or explanation to Hal's update post? These results are shocking.

 

RudeG,

What I know for sure:

-Turbo (6765 T4 .81 a/r) is capable of much more than this, and back pressure was not an issue.

-Exhaust pre-turbo piping is all 2.5” (other use 2.0” in places) and it also is capable of flowing a lot.

-IC piping is 2.75” from Turbo to IC, this is enough to support 1200cfm (Corky Bell)

-IC to TB piping is 3.0”, again plenty large

-FMIC will flow over 1000 cfm (as per advertisement) and the manufacturer tells me that supercharged mustangs have made 600whp with this same FMIC. So the flow (cfm) is there.

>>>>What I don’t know is the thermal efficiency of the IC, as it is a 6” tall core. A 9” would be better, as the air charge would spend more time in the IC, exposed to the ambient (cooling) air. This could be an issue when going with more than 12psi of boost.

 

Wow, definitely expected more...
Sasha i think that heat shield is an excellent idea. I noticed how close it was to the header when installing mine.. Lemme kno Wat u come up with....

 

AITs must've been up there for Hal and Sasha to be recommending a larger FMIC. Chemical intercooling is another option. Clearly, there's something going on between 9 psi and 16 psi - looks like it started out great and then hit a wall. I don't know this turbo that well, but it would be interesting to plot onto the compressor map to show where flow lies relative to its the efficiency range?

Thanks for keeping us updated and good luck.

 

^ Which is why I'm shocked at the results Sasha!

I didn't know the IC core was only 6" tall though. For comparison, the vertical flow IC core of the standard APS kit is 25" x 9" x 3.5". Were high AIT's an issue in these dyno runs?