what was the a/f ratio when you dyno'd?... with that much flow rate it might be pulling timing due to lean condition?....

Shawn will get you dialed in!

 

To really know what the potential differences are, dyno the MREV2 setup once again immediatly after the Cosworth tune.

In any case, if Shawn tunes your car, it will make more power.

 

Awesome, I ARE JEALOUS!

lol, can you post some pics of your car? all I ever see are pics of all the amazing parts you put on it!

 

Damn, sorry to see that Dyno, is it because of your plenum, or the tune you have?

Or a mix of both?

 

You can tune all you want and change cam angles, etc., but that isn't going to change the fact that the Cosworth plenum is not breathing beyond 6700rpms or about 400rpms better than the stocker. The only way you're going to increase rpm breathing above 6700rpms is to add cams for about $2,500 installed because that intake manifold has met it's match with the stock cams at 6700rpms. Tuning may help the low and midrange power somewhat, but I wouldn't expect any miracles. He might find 5-7whp here or there, but the reality is this damn sexy manifold isn't performing up to it's claims. I really don't see how the thing would even benefit a forced induced car either. Now for a car with heads and cams, I can see it, but even the stock intake manifold is capable of more too.

Johnnylaw- have you verified you don't have a vacuum leak anywhere? A very slight leak could be causing an issue. Is it idling funny? Hiccups anywhere?

 

You have to remember that the Cosworth is being compared to the MREV+spacer combo. That combo is proven to be worth substantial midrange torque over the stock setup (my 05 6MT picked up 15-16 lbs-ft with the prototype). Jonnylaw's dyno graphs show the Cosworth (sans tuning) to be down less than what the stock manifold would be vs. the MREV. I think it is likely that the Cosworth will be able to come close to matching the MREV down low while providing superior top end. Speculation? Yes, but we do have some reference points. Worth the $$$? Don't know.

I do think checking for leaks, etc. would be helpful though.

SC

 

congrats, looks sick

 

hmmm. The only idle issue was getting the ecu to relearn the idle air volume. I believe idle was raised 50 rpm. Other than that. No hiccups or anything. But what is the simplest way to check for a vacuum leak?

 

can istall a vac guage and see if it is fluxuating

 

hmmm. My mpgs have gone up since installing the Cosworth. Before that I had the MREV thingy and the APS plenum.

 

Well, my MPG has improved slightly, but is still less than desirable.

Rookie you retuned after you installed the cos plenum?

 

I run off of maf so JWT told me if the A/F looks fine I wouldn't need a much of a change.

 

I received the Osiris software and cable from SC and uploaded his base maps. The reflash was quick and succesful.

From the limited amount of driving I've done, I can say that the base map itself feels better than the TS reflash. MPG also improved right away.

I plan on doing many performance logs on the street and on the dyno. The hope is to get enough data to Shawn, so he can create some custom maps for me to optimize everything. Many thanks Shawn for offering your tuning services from a remote location! (I know it's not the norm).


To those who are N/A and are considering the Cosworth plenum, don't expect to just slap it on there and gain 17hp. It seems that custom tuning at a minimum and/or agressive cams, headwork would be needed to really take advantage of the Cosworth plenum, if you're not boosted.

Just replacing the stock intake manifold with the Cosworth, seems to give gains similar to a spacer. Sure it looks nice, but $ to hp ratio isn't that great.

Having used the MD MREV2 and 5/16 spacer combo for 2+ years, there really is no better bang for your buck N/A if you have a revup. The torque gain is great and perfect for street driving. Much Respect to Tony and Motordyne for that!

With that said, The Cos plenum in staying installed with the hope of getting everything optimized with SC custom Osiris maps.

But if it wasn't for future F/I plans, Osiris, and the very capable tuning skills of Shawn Church, the MD setup would have likely gone back on.

 

WOW, thanks for gettin' all that info out there!!! i actually had a cosworth plenum on order for the longest time, BUT after talkin' to a few different tuners who did some independent studies w/the part, i pulled out and got the MD 5/16 iso-thermal. just to let anyone who's interested in this high dollar piece, i was told that for NA aplications the bottom end TQ loss wasn't worth the minor top end HP gains. also for boosted aplications, i was told that the end caps leak under pressure. from what i've heard it's just been over-hyped under very specific & ideal conditions... sorry guys, i really still do love the look & idea of it. good luck w/tuning and low-boost apps.

 

Well I have plans for a HKS GT SC with a 9lb psi pulley, so hopefully the Cos may be benefecial then.

As far as leaking, I have only heard of Eagletangreen who had problems at high boost (and if you search on 350z, you'll see that after the cos, he put on the Crawfor and totally blew it apart!!! lol):

http://www.my350z.com/forum/showthre...t=engine+blown

Rookie at others are boosted with the Cos and have had no problems with leaking whatsoever.

No doubt for N/A, 5/16 spacer and MREV2 if u r revup is the way to go.