To make the numbers more meaningful, here are a list of performance upgrades I currently have on my car prior to having the Tomei Headers and Cams 264/264
-Jim Wolf Tech Popcharger
-Stillen Z-Tube
-Motordyne 5/16th Spacer
-Motordyne MREV2
-Ichiba Headers (similar to strup/dc/nismo)
-Ichiba Test Pipes
-Motordyne XYZ + Resonator
-Motordyne Dual Gamma Exhaust
-Motordyne Coolant Control Valve
-Unorthodox Racing Underdrive Pulleys
-Unorthodox Racing Flywheel
-Southbend OFE Stage 3 Clutch
-Osiris Tune

Prior and during all of the upgrades above I've had a few dyno runs on a Mustang Dynamometer and the baseline came out to be 209HP/183TQ stock and after the list above 258HP/223TQ, for a net gain of 49HP/40TQ.

Since the shop that did the installation of the new headers and cams have a different dyno, I got another baseline to get more meaningful results. Today I went in there to pick up the latest dyno after they installed the headers. For both runs displayed on the graph they have done some fuel correction and ran a total of 15 runs and got the last of each group.

Note that that the dyno shows Ichiba Headers vs Tomei Headers. Unfortunately I do not have an OEM vs Tomei. The graph looks funny since the scaling are not the same for HP and TQ, but i'll get another one tomorrow. Note that the dyno is corrected and with no load.



My expectations were that I will only see very little to no difference, but I'm glad to see that I picked up great gains throughout the entire range. Car sounds nicer with less droning then the headers.

EDIT 8/20/09: What started to be just a cam and header install turns out to be a lot more. Pages 6-9 talks about the new intake setup.
-Apexi filter
-Z1auto MAF housing
-Samcon Induction Hose
-Cosworth Twin Plenum
Also a new rear end setup which is discussed at the same time
-Quaife ATB LSD
-4.09 FD
-SPL Aluminum Bushings

 

Here are some pics of the headers and cams. I'll get some pictures of my old headers for you guys to see.

 

damn you wrapped the **** out of them...

 

It's actually only wrapped one layer, but it has silicon seal and spray on them. Wrapping these headers have got to be the most painful thing i've ever done to my car (frustrating and itching). I'm glad i got the Tomei wraps cause they can conform to shape much better than anything else, but still took over 6 hours to wrap properly (look how contorted and tight the headers are).

 

I know its probably been asked but is there a fitment issue? With the headers hitting some lines? or that has been solved?

 

I gotta be honest, looks like a ton of money and work for very minimal gains.

 

No doubt that it is quite expensive considering the high price of the headers, if you consider that a lot of people add exhaust for practically no performance these are well worth it, since it enhances the performance and sound.

I believe that the gains would be closer to 10hp/10tq across the board if i didn't already have my other headers installed. Though the peak seem minimal, the gains are pretty even everywhere. It's something I was happy to find out. I can assure you that a shift in power like this makes the car feel much different.

 

So the dyno above is with cams and headers? The NA gains are tough so if the tomei's make more than ichiba's(most others) then they are worth it IMO. Think about the money you have to spend to find the gains you did from better headers with another part. I just spent $400 between the z1 maf and tune to get under 5hp. I probably could have picked up more hp with these headers and been able to sell my dc's.

 

so is the after dyno just headers (in addition to all your previous mods) or headers and cams?

 

I am 99.99% sure this is just the gains with the tomei header. 400 for the maf and tune? I only spent 100 for the quick retune with the new maf (100 for the maf too). I guess I got lucky that my tuner had already done 2-3 cars with the larger maf on an NA car. I actually think in the world of NA mods 5/5 at the wheels is decent over the generic aftermarket brand headers.

 

The maf was like $12X with the ridiculous shipping and it was $265 for the tune 2 1/2 hrs at $100 hr. These are nice gains from header to header. Curious what the cams do.

 

03threefiftyz is correct, those are just gains from the headers on top of the Ichiba headers. I will post up some dynos of the Cams on top of the Tomei Headers tomorrow.

I'm really thinking of doing this MAF housing from Z1auto, but I want to find a good filter first since I don't want to bore out the popcharger. Any suggestions?

 

if it were my car, i'd go with the aem dry flow filter. they make it in a bunch of different sizes, i'm fairly sure you can find a size for you're application

 

I think he is referring to the interior velocity stack that comes with the jwt. It is only 76mm and the z1 maf inlet side is 80mm. Ideally they should match-up.

 

the aem filter that came with the intake i put on my sister's sti had a built in velocity stack...

not sure if we're talking about the same thing here cause i've never seen a pop charger in real life

 

Got a link for the maf houseing havnt read about this yet.

 

I have one on my car......here is a pic installed.




I suppose if you really want to see it I can take 3 mins and take it off.

Link to the product.
http://www.z1auto.com/prodmore.asp?m...ke&prodid=2973

 

^thanks

 

I should mention that this REQUIRES some sort of tuning. The car will not run worth a chit without recalibration for the larger maf housing.

 

Just got my car back from ZCG after the cam install. Man the sound of my car has completely changed. It is extremely low and sounds like a V8 race car. The sound is just right and not too loud. The whole crew over there were in love with the sound. All the rasp and almost all the drone have disappeared and the gains were fantastic. Tomei is an awesome company, if you compare my dynos to what they have advertised, it is nearly identical in the the way the curves behave. I'm glad to see that Tomei posted realistic dyno graphs that would show typical gains.