3.4 Dyno Chart
 

Just wanted to share the lasted dyno chart after final tuning. The motor is a 3.4. The great torque curve is courtesy of cams from John at DRCamshafts. We have used these exact cams in a couple of other 3.4 builds and love the power/torque curves.


http://forums.pelicanparts.com/uploa...1571890484.jpg

Cheers

Jeff,
I got a similar shaped curve with John's 993SS cams in my 3.4 build. Only difference to your build is that I used the standard 3.2 intake manifold and consequently lower peaks of course.

Similarly I used Motec/twin plug/CoP/twin O2 sensors/twin knock sensors/AFM delete tube/1 5/8" BBE's/Dansk Motorsport muffler/Mahle 10.3:1 98mm. It's great to drive in the Twisties.

What is the spec of the cam you used?

Really impressive - I achieved similar figures on my 3.45. Similar setup except for using 1.65” OD headers

Since it is showing uncorrected, what temps were this engine ran in?

Very nice....
I have a stump or two on the property. I was going to use the Tundra but ?????

Very nice shape to those power curves. Love the flat torque curve. Looks like there are some more rpms in that beast.

Very nice Peter, this motor has a DC44 108.

We have another 3.2SS on the dyno right now, then sending out latest 3.8 over there as well.

Jamie,

We ran out of injector... It could spin 7200 reliably I feel, but we limited it to 7000. With a larger injector we would seen north of 300 at the wheels.

cheers

Very Nice!

Thank you Henry. We do have a tow hook on the rear.... :)

Dyno room temps approx 78 degrees.

That is awesome. Great build!

That's a V-8 torque curve. Very nice. How does it drive?

Thanks!

Yes very flat, almost like a new gen small turbo car, except it keeps pulling. It drives a amazing, never really in the wrong gear. You can run it out to 7K or short shift it, always some torque there. It also helps that it is in a car weighing around 2300lbs :)

We have built this combo a few times and just love the torque.

We have a 3.2SS ITB motor on the dyno getting final tuning right now, then the 3.8 ITB one will be on the dyno hopefully late next week. Just putting some break in miles on it before final tuning.

Cheers

Great job on this build Jeff!

Love it, such a good promise for my 3.4 build...almost the same spec except for PMO's, Eisenmann exchangers and DC35 cams....

If I can get that torque curve even with 10% less HP and torque I will be delighted.....

Dennis

which injectors were you using?

Any reason to go with 98mm pistons over 100mm? I am having an engine built and thinking 3.5? Also struggling with ITB selection, as there are a number of choices. I want something easy to maintain over all else.

I have a 915 box (engine will be in a 71T) ... stock gear ratios seem fine; any sense in re-gearing it closer / shorter? With this torque it would seem not.

These were 30Lb Bosch, we should have used a 36lb.

The biggest reason is cost, trying to stay within a customer's budget. 3.2 95mm cylinders can be bored to 98mm and plated. This is a reliable and durable solution. Pistons cost the same either way. The 100mm we have used on a couple of 3.5 with good results also.

For ITBs, we have built a few motors with the Jenveys and really like them. We have also used PMO's but found they did not make quite the same power on similar builds. The PMO are very easy to set up mind you. The Jenvey's are also easy, but take a bit more time.

I am also quite intrigued with the Rasant Products ITBs. They look very similar to the Kingsler being used on the Singer and feature Idle air control which is nice. They also are available with an adapted 964 or GT3 plenum. Would love to do some testing with the plenum to get a first hand look at what happens to the power curve (have seen conflicting data).

Cheers

Jeff,
The Rasant's ones look different to the Kinsler ones:

https://kinsler.com/Shop/product/porsche-itb/

https://rasantproducts.com/rasant-products-intake-system-is-6-individual-throttle-bodies/

They both look good though and I hope you can do a itb comparison with and without a plenum soon.

Calling motor builders,.While on the 3.4 subject.... i am ready to upgrade my twin plug 3.4, Je 10.5, GE 60 cam 46 pmo motor to 12.5:1.
My quandary is should i be going to a GE80 or more agressive still cams and 50 PMOs?

Full Areo slant nose Track,hill climb ,sprint use car, 2100lb, that i currently rev to 6500 RPM.
Any one have dyno sheets on these options. Experance to share?
Thanks


http://forums.pelicanparts.com/uploa...1572337446.jpghttp://forums.pelicanparts.com/uploa...1572337646.jpg

aero package
 

I like the front treatment and the rear undertray.How about a shot of the rear straight on.More compression to 12.5 never hurts.Fred

The rear defuser is fed by a flat sculptured floor the front splitter has 2 defuesers built into it.Great lap time improvements.
Webby



http://forums.pelicanparts.com/uploa...1572392037.jpg
http://forums.pelicanparts.com/uploa...1572392074.jpg
http://forums.pelicanparts.com/uploa...1572392074.jpg

And the latest 3.2SS that just got tuned. Ambient temps were a wee it lower for this one, hovering around 10C.

http://forums.pelicanparts.com/uploa...1572415042.png

That's fabulous! Wow. what cam is that with?

Wow, that's awesome! Also curious on Cam. That DC44 seems like a great fit.

dc44-110

Does that debunk the theory of SSIs being restrictive?

Also, how does a 3.2 out-torque a 3.4 - my simple brain does not compute?

What factors helped you decide to do a Lobe Separation Angle of 110 on the 3.2 and 108 on the 3.4? Thanks for educating us!

Discussions with the cam grinder about the client's needs. John has far more experience in the details of what each of his cams can provide. Mining knowledge and experience from others is part of what helps us learn. I wish I could say I had a secret formula... :)

Cheers

Every engine is a sum of its parts and they all need to work well together. I believe there is more power and torque in the 3.4 (remember we ran out of injector). We also did not have control over the exhaust, it was already on the car, and although a good sizing for the displacement, the tube length and muffler design likely are not optimal.

Trumpet length, butterfly placement and injector placement are all factors as well. I would love the budget to fully optimize and test various configurations.

Have done limited back to back dyno testing with open velocity stacks vs tea strainers vs typical K+N Watersheild style filter, but would love the time and budget to do more. I love finding what works, and debunking myths like we did with the filter tests on 2 different motors.

Cheers

Thanks Jeff - you may have seen my dyno graph floating around on a few threads.

This is a 3.4 with GT3 crank, 45mm ATPower, twin plug, 11.5:1, motec, William Knight (Elgin) cams, Eisenmann 42mm OD SSIs. Thin lines with stacks, thick lines are 993 plenum. The map for the stacks was tidied up after the graph was plotted so some of the ‘waves’ will have been reduced.

http://forums.pelicanparts.com/uploa...1572603104.jpg

This thread is useless, absent of engine pictures. ;)

The 3.4....

http://forums.pelicanparts.com/uploa...1572660617.jpg

The 3.2SS...



http://forums.pelicanparts.com/uploa...1572660751.jpg




Cheershttp://forums.pelicanparts.com/uploa...1572660894.jpg

That torque curve on the 3.2ss is impressive, especially down low. Can i ask which port sizes you went for? I hear that big ports kill low end torque

Travis, we used the stock small port sizes, just had them cleaned up in the guide area and then the manifolds for the itbs were matched to the ports.

Cheers

Our Dyno Tuning shop, Statified Automotive Controls, asked if they could get their hands back on the 3.4. We obliged. This was the first AEM Infinity they had tuned. Once they tuned the 3.2SS they thought they could coax a bit more power out of the 3.4. And they did....

An additional 16 WHP and 9 lb/ft. Very pleased.

Can't wait to see what they do with the 3.8 next week!!

http://forums.pelicanparts.com/uploa...1573026327.png

Cheers

Small port size meaning 34 mm from the stock 80-83 3.0 engine ?
Or 39.5 from 78-79/ or the 42.5 from the 3.2?
thanks Jeff , great job