Well, I just installed my metal inlet tube on my Z and got to open it up last night. I am seeing about 3-5#'s increase in boost. This is a great mod!

 

That's GREAT news as as we can all attest to the fact that the ATI orange flex hose has been a large bottleneck in the intake system. Curious to see some dyno results between the two.

 

Nice, didnt belive that it should make such a diffrent

 

In my opinion I would run a Hard 90 degree elbow then use the flex tube to the filter and call it a day. THe problem is not the flextube its the ATI hat from what I have seen. The orange Flex hose from ATI might not be the best but others have used similiar and worked great from what I have seen.

 

I had the new ATI hard plastic inlet tube, not the old flex hose. So the difference is between the hard plastic one and the new metal one. I just checked it out today in the days heat instead of the coolness of night that I saw the 3-5 boost increase before. I still saw a 1-2 boost gain in the heat.

 

I don't even see a 3 pound increase if I go filterless. What rpm are you seeing these increases at.

 

Well, originally I saw max boost on the dyno at 7,000 RPM at 15.3#'s of boost. After the stock ATI plastic inlet tube and a air filter it capped me down to 10-11 #'s at 7,000 RPM. Later I found that the max I should run the D1SC to was 6500, so after looking at some old dyno numbers in reference to boost, at 6500 RPM I was making 11#'s (this was with no inlet tube). Now with the new inlet tube (keep in mind its a few degrees cooler than at the dyno), at 6500 RPM I am seeing around 14#'s.

 

I was thinking you went with a bigger filter from EPP and ATI hard intake and it helped bring the boost up. Do you have any comparisons between that setup and your new 4" elbow? I'm just wondering because I've haven't checked my new F1A for restriction yet and might give this a shot.

I don't understand this. Are you saying your making more boost than with no inlet tube at all???

 

With all my different setups and dyno's I understand if it seems confusing. I'll try to better explain;

dyno runs temperature upper 90's, humidity almost 90%, I saw 15.3#'s of boost at 7,000 RPM with no inlet tube or filter (open blower). Dyno run with the small filter and the ATI hard plastic inlet tube at 7,000 RPM we saw 9#'s of boost.

After installing a larger air filter from EPP (still running the hard plastic ATI inlet tube), I saw 10-11#'s of boost at 7,000 RPM.

Then I found the max I should run the D1SC is 6500 RPM.

New metal inlet tube, 65 degrees and low humidity, I saw 14#'s of boost at 6500 RPM.

I am sure if the temperature and humidity were lower at the time of the dyno, I would have seen an increase in boost. But as it is now, I would say I see a decent 3-5#'s of boost increase. Without running it to 7,000 RPM on the same dyno with the same climate coditions, its pretty much just my estimate.

In a couple more weeks I have a dyno tune scheduled (also will be adding methanol injection for the tune), so we will see what the boost is like on the dyno.

 

I understand now. Were you using the metal inlet, EPP filter, and some sort of dryer hose when you got the 14 psi at 6500?

 

Not to sound like too much of a newb, but what is an EPP filter. I did a Google search and it stands for the European Peoples Party... but that doesn't sound right. The vendor index has EPortworks.com but that isn't really "EPP".

 

Exotic Performance Plus, they are a shop in Indiana. I'm not sure why people call it the EPP filter, when it's just a larger K&N than what ATI supplies in the kit. You can get it from anybody that carries K&N, even your local parts store.

 

Ponyhntr is correct. The larger filter was ordered through EPP (Exotic Performance Plus), however it is just a larger K&N Air Filter, not something EPP custom made.

Yes, the 14#'s of boost at 6500 RPM was through the larger K&N air filter, the metal inlet tube, and the piping connecting the two are metal as well with silicone couplers. I'll try to get pics and post them up soon.

The temperature just dropped about 10-15 degrees today (mid to low 50's now), and I'll see what the peak boost is like now, and post it up.

 

Git 'er done Ben!! Just be careful, hopefully your tune is fat enough to allow for the extra boost!

 

Well since it was tuned on such a hot day, and at 15.3#'s of boost, I should be alright. I've got a wideband 02 sensor in the car now as well, so I can moniter it and make sure it doesn't go lean.

If anything the car is running rich right now anyway. I've been opening it up quite a bit, and mostly under WOT in the boost I see an AFR of 10.7 or so. Once or twice it dropped as much as down to 9.8! I'm thinking about changing out the spark plugs before my dyno tune at the end of the month, as I think they possibly might be fowled out.

It seems to be running good other than a very slight miss here and there both under WOT, and normal driving. I'll be hooking up tuner cat tomarro to better assess things.

I ran a buddy of mine who has a 500 RWHP fox body mustang (Vortec T-Trim I believe) a few nights ago repeatedly with 3 people in my Z, vs just him in his Mustang and I ran away from him easily every time, both from down low and up top.