Compound Turbo Setup Holset style

[viperlp01]

Can you think of a reason not to?

 

[viperlp01]

Got the car on the dyno. Made 530 whp @38psi so far. I blew out a throttle body gasket and have only gotten it rev'd up to 7k.

 

[LandSpeed-DSM]

What PR on the primary stage?

 

[viperlp01]

Primary is 18psi on spring, Big is at 20 with 18psi worth of spring and a hallman inline. I will be turning the big up tomorrow.

 

[AK Maniak]

I'm sure this question has probably been asked already but why weld the deck? What's the benefits?

Alex

smh

 

[viperlp01]

Worked out some bugs and now I am ready to start turning the boost up

[ame=http://www.youtube.com/watch?v=juzliyakVJs]Force engineering low boost pulls. - YouTube[/ame]

 

[viperlp01]

[ame=http://www.youtube.com/watch?v=L7wDxfYSK1s]618 WHP/ 483TQ Force Engineering Talon - YouTube[/ame]

 

[fosforito95]

nice, are those the final numbers or still tweaking away?

 

[Archer Fabrications]

That dual spool sounds awesome! Like a jet!

 

[viperlp01]

Still messing with the tune and figuring out the compound setup. I need to stabilize boost pressure. Once I can get a flat curve I should start making serious power.

 

[LandSpeed-DSM]

That sound is intoxicating and there is a TON left in there.

Depending on just how much that cam improves VE and how for it will let you run out.. the standard 67mm HX52 shouldn't be out of steam on a 2.0 till past 11k and move ~95lbs in the low 40s for boost.

Hope you got one of those 7 bar MAPs handy!

 

[viperlp01]

Haha I will be looking at a bigger map sensor soon. The boost in acting funny and once I get that figured out I will start turning it up. I am at conservative timing and not one count of knock. 12.2ish AFRs. Tune it super smooth and this "Nasty" engine is loving the boost.

 

[GRAVEDIGGER]

Lookin good! It's gonna be sick once you get it dialed in. I was watching some videos of you at the shootout again last night and damn.... That thing does sound awesome with those Holsets whistling away. Sounds different than all the others. Good luck getting the boost stabilized and the rest of the tune in check.

 

[viperlp01]

Ordered some lines and fittings to try to smooth out the boost curve. I will also try to log some information using the dynos map sensor and the couple map sensors we have laying around.

 

[Kevin Jewer]

Sounds good. What's your theory on the boost control issue?

 

[viperlp01]

I have never had great luck controlling boost with reference so close to the compressor wheel. I always like referencing actual manifold pressure. I moved the vacuum lines down stream from the HX52 and routed a line from the manifold for the primary gate. I also had a horrible boost leak at the manifold. Some other tiny ones but should have all that situated now.

 

[viperlp01]

Ended up making 644 corrected tonight with a 50 psi spike falling to 44psi. I ran the Dyno's boost gauge to the cross pipe and found that the secondary charger was dropping boost pressure with RPM. I added a stiffer spring and the boost pressure was higher but still dropped off. I am going to be adding electronic control to the secondary to keep boost steady.

 

[Archer Fabrications]

Electronic boost control for the hx52? That thing is rather monsturous.

Maybe the h1c is too small of a primary. I think there is someone making 800awhp on like 30 psi woth a single 52, with that much boost you should be well over 644, im not sure whats goin on but something is.

 

[Archer Fabrications]

Delete

 

[viperlp01]

Your confused by the fact that your comparing horsepower numbers. I get this over and over again...

-FWIW at 50 psi tappering to 44psi I am at 95% IDC @ 12.2 afr(gas scale) with 2150s at 45 base pressure.

-Autos read 15-20% lower than 5 speed dsm's.

-Mustang Dynos read 8-13% less than dynojet

-My boost is dropping 6 psi. 6 psi is HUGE in airflow as it is all in the secondary charger

-The primary is to get the engine making torque earlier. The earlier the torque curve starts going up the more exhaust energy, which will decrease the spool time with the secondary(Some heat will be lost through the turbine wheel on the primary)

I think auto dyno numbers are rarely posted because they are generally pretty low, and people feel embarrassed or too proud to post numbers that low. I really don't care what the numbers are. This car last year went 9.7 @140 all day long at 37psi. At 37psi this year I dyno'd 550hp to the wheel. I am already AT LEAST 100hp more than I was last year and I can stay in third gear.

Here are some auto dyno vids I found on youtube:

6262 at 26 psi on a dynojet-470hp/320tq
[ame]http://www.youtube.com/watch?v=j0WQ7EpA25k[/ame]

42R at 37 psi on a dynojet- 612hp/NA tq I seen a video where this car goes 8.69 @ 161
[ame]http://www.youtube.com/watch?v=fIVjEwcGifI[/ame]

42R @ 24psi on a mustang 540hp/NA tq. Fastest 2g auto in the world. I made more power than this at less boost pressure on my secondary
[ame]http://www.youtube.com/watch?v=DEIDncRP_nI[/ame]

Jeff Bush goes low 8s at 900+ hp at 45+psi on a 42r.

 

[Archer Fabrications]

Totally forgot you were auto my bad.

 

[jeffrox]

Any updates? Was curious if you figured out your secondary turbo boost control issues. Thanks for keeping us informed and keep up the primo work.

 

[viperlp01]

My primary exhaust gasket blew out the back on closer inspection. I am also going to run a turbosmart Eboost 2 on the secondary for better control of that turbo(4 port solenoid). I will also be able to have boost by gear and rpm plus a bunch of other awesome things.

 

[danielsl1999gsx]

Wait.. is this really on a stock block ?

 

[turbo23]

Wait.. is this really on a stock block ?

Its a Factory 1995 engine block