I think you have this backwards: the TQ gain is what's driving the HP increase at the rpm range below 7000rpm. Over 7000, the computer is pulling back timing due to the heat at the time, and that's the main reason why we stopped the run at 7000rpm.

It's evident from the graph that this cam is making quite a bit more power at everything under 7k... if conditions were different, there's no doubt that the TQ and hp would have carried all the way to 7300... But for us and the car owner, we are not willing to take that risk on the motor with the 100+ degree heat just to prove a point... If you look at the graph, the point has been proven... the NET gain for everything under the curve is undeniable

 

Thank you Mike for that explanation, I’m sure Professor had a better grasp of the graph’s meaning soon after posing the question, but I’m glad you clarified for the rest of the readership. Can you give us an example of how high IAT’s were and the degree of timing pull approaching 7k rpm? What octane fuel was in the car’s tank?

 

Have to check with Jason on the IAT at the time of the dyno run... but i recall the ecu was pulling 10-12 degrees at approaching 7k.

It's not just this car... if you look at the other two cars we recently tuned (Scooter3k and M3ntal on our forum), both cars experienced the little "dip" at 7k+ RPM and all are related to hot TEMP/higher IAT and ECU pulling back timing :( Triple digit temps sucks

We're in cali again this weekend... will get back to you once we get back into the shop on Monday :D

cheers.

 

I agree this is typical behavior, I have pulls on 100F + days where it all goes flat above 6.5k rpm, IATs were above 220F, and timing altered long before that. I just wanted verification from someone who was there at the session, fact instead of an educated guess on my part.

 

Hey Mike can
I request a 70° day for my tune on the 18th? LOL

 

you'll be in LA so the temp will likely be in the 80's... just bring some ice packs to put in front of the fan BTW, that's called 'cheating'

 

Like the "Ice Man" packing the whole engine bay with bags of ice?

 

you mean like the m7 car at the dyno day in Huntington Beach?

ya... that one

 

No, I meant you tuning Danny's car.

 

funny how I have been all over the country tuning cars and they all make big power...... not to mention winning races and setting course records but let's not let FACTS.... get in the way here

 

Facts...let's not go there, it would not be good for you.

I don't want to take this thread anymore off topic than I already have, sorry guys.

Jan, on the other hand, would love to see this thread derail and crash.

 

I believe what I see with my own eyes.

 

.

 

See what?

 

Chase is back from China and has provided cam dyno data for the NS2 camshaft. The Delta on the dyno graph below represent gains from a very good Mynes tune, the linear character of the plot line tell a lot about the NS2 in the mod mix. The torque gains began early and continued until high up in the rpm range. Considering it was a109F day, on 91octane gas, the torque line is very stable and amazingly flat.

Chase’s car has an HAI, 16%, oversize crank pulley (size?), Alta V1 intercooler, DT BPV, Bosch 550cc injectors, Endyn ported head with huge valves, NS2 camshaft, OBX header, and Invidia cat back, plus Mynes tune. The lower end is no spring chicken either, 108,000 miles on the pistons, rings, and cylinder walls; Chase doesn't exactly drive like a grandma either.

 

Impressive.

 

Or UNPOSSIBLE!!!!! hehehehe

 

go chase/mynes/keith/lynn/everyone else who put into that thing :P

 

Not bad for a 100k car and I am jealous. I am planning on making the trek down to PHX from Kansas close to the end of this year.

 

Let’s not forget Larry at Endyn, the headwork was by his hand, and the plot characteristics have as much to do with quality of flow through the head, as what’s being facilitated by the cam and tune. And not to be left out, other contributors, Justin, Mr. & Mrs. Davis, April, Davis Equity staff, and Chase's girlfriend!

 

Very refreshing to see credit given to those who do the work. Open and Honest vendors are always my first choice.
Again, nice job everyone. Done the way it should be.

 

Backhanded compliment to one vendor slamming another? Seriously, you need to give it a rest. It's grown tiresome, and I'm not an RMW fanboy by any means.

Anyway, and more importantly, great work guys--looking at the pairing of bigger injectors, a regrinded cam versus Newman cam and BVH (thumper or jesus head) down the road myself (along with a header, again RMW or Mynes), probably next spring once I have the suspension and brakes completely sorted out (which I think I finally have), and get some seat time on the track with my new setup. I'm interested to see how well this combo will hold up long term, but the intial results do look promising, it'll be interesting to see how the two different setups work out over time with regard to performance and reliability.

 

No backhanded comment in the slightest, just my honest opinion, and one of others also. You must be reading your own experiences into my post.

 

Nope, my experiences have all been good. Look, I'm not going to get into it with you, I've seen it too many times to see where it'll lead.

It's just that the backhanded slaps really should stop. Just my honest opinion, and one of others also.

 

+1