This customer Evo 8 made 489 whp the way it came in. In two pulls with some major fuel adjustments it picked up over 70 whp so it was clear it just really needed a retune. We retuned the car on the street for better drivability, startup, fuel economy etc. as we do and then brought it to the dyno at Magnus to see what our tuning had gained.
It made more with SAE correction on, but in order to be as “honest” as possible with the results correction was turned off for all pulls. It made 623 whp, 516 torque at the same boost the car came to us with, a very solid gain from tuning. We’re good, but obviously we’re not magicians…the tune just really needed some work.
The customer wants a good amount of power and wants the car to last so what better way to make more power at less boost than to try Magnus’s new version 5 cast intake manifold. It went on the car and I added a bunch of fuel to the AEM mapping for the first pull just to be safe. Sure enough it made power even with pretty rich AFRs and the boost was 1 psi lower than on the stock manifold. The MBC wasn’t adjusted…the boost just went down a pound.
A few pulls later I got the AFR leaned out back to where it was on the stock manifold pull for a good comparison run. With the boost still 1 psi lower, the Magnus manifold definitely made some jam. You can see up top the gain was over 70 whp and it outperfoms the stock manifold just about everywhere. There was no low end loss as seen on some other designs, only gains. Ignition timing and the boost controller were not adjusted the whole time the car was on the dyno.
On the street the transient boost response is quicker with the new manifold. I don’t know how else to describe it, but the power delivery also feels smoother. The cast manifold is a sexy looking piece of hardware, but I wanted to see results too and this manifold definitely works…really well.
Peak power with the Magnus manifold on was 674 whp, 529 torque, again with correction off. It was about 700 whp with SAE correction on. It has more in it, but the boost will be backed off as per customer request so there was no sense pushing it. Frankly I agree with him that you don’t need this kind of power all the time on the street. Of course if he changes his mind…now he has the option. 
This car is running on 93 octane with meth injection.
2.3L Brian Crower stroker kit, 272 cams, T67, AEM EMS, catless 3" exhaust, 1250cc injectors, dual walbros, etc.
I have been checking fuel economy as well and I was happy to see it was over 20 MPG in mixed driving. In 225 miles I went from our shop to Toronto including some tuning pulls on the street, all the dyno pulls, a street test after dyno pulls, and most of the trip back on one tank. The definitely sucks gas while in boost, as any car making this much power will, so it’s doing well on the big injectors off boost to still be over 20 MPG overall.
Dyno:
Video of dyno pulls and some of the manifold swap:
http://vimeo.com/2335738
