ITBS or Miller PSIK

[korn]

ok team; Here is what I am debating- any insight and help would be appreciated.

I have just rebuild the top end, 272 cam, green top injectors, chip, and cat back exhaust. stock bottom end...

I have stock headers/cat. Everything I have read indicates that I am not at the power point where headers would make too much difference.

1) I LOVE the idea of ITBS. Does the car run well with motronic and the rhd itbs into the airbox? (i realize i would have to move to another management if I want them open, but I would prefer to do that down the line)

2) Or based on this setup should I just go Miller?

3) Instead of intake- should I focus on exhaust?

[digger]

I've not seen anyone execute the Itbs on motronic yet but I know of people working to that goal with the miller maf and wArchip . I doubt you could connect the AFM to the air box. There might be others that have been successful though maybe email Rama at Racehead . What are your end goals ? That will help decide if you should bite the bullet and go ms pnp or other standalone for the added flexibility.

[korn]

i see. I thought that was the whole point of running ITBs through the airbox- avoiding engine management changes?? RHDs website indicates it is bolt on...

doing my own tuning is a bit intimidating. So I would like to keep that to a minimum.

Miller on its own would be the simplest solution.

Long term The plan is to continue the slow burn. If there was a pretuned software to make ITBs easy. I would do that...

[digger]

The main advantages of airbox are better filtration, being able to duct cooler air.

[korn]

So: is there any way to run ITBs out of the box?

[nando]

you could just run it but it's not going to make any sense while using the stock computer. ITBs are not usually something you do while keeping everything else 100% stock.

As far as the WAR chip - I've known so many people who've never got them to run correctly, I'd be wary. I understand that it's an attractive option if you want to stick with the stock computer but it just doesn't seem to work out most of the time.

[SkiFree]

you could just run it but it's not going to make any sense while using the stock computer. ITBs are not usually something you do while keeping everything else 100% stock.

As far as the WAR chip - I've known so many people who've never got them to run correctly, I'd be wary. I understand that it's an attractive option if you want to stick with the stock computer but it just doesn't seem to work out most of the time.

He is referring to the Miller MAF/Intake combo, not the WAR chip. Less things that could potentially get screwed up.

OP, If you're skittish on learning to tune, then ITB's are not your thing.

[digger]

you need to find a friendly r3V member to help you install MS and use the tune from someone who has ITB running MS. otherwise it is probably not something you should dive into yourself

[korn]

Appreciate the input!

[whitebulat22]

I have a related question, do you guys think the psik claim is plausible? It claims basically same amount as itbs but other dynos show a maf to be worth 3 hp and a tune not much more. I don't see how it adds up to 23 whp and wtq peak. The length of the system isn't any less than stock from what i can tell.

[SkiFree]

I have a related question, do you guys think the psik claim is plausible? It claims basically same amount as itbs but other dynos show a maf to be worth 3 hp and a tune not much more. I don't see how it adds up to 23 whp and wtq peak. The length of the system isn't any less than stock from what i can tell.

I have not seen any back to back dynos refuting it, so anything short of that is speculation.

As for the dynos you have seen. You have seen a dyno of a miller MAF+tune worth 3hp? Or are you looking at some home-brew setup? Never underestimate someone's ability to screw up "performance mods" when they are doing it on the cheap.

[whitebulat22]

I was going off of this megasquirt test which replaced the afm with a smooth pipe and gained 3 HP. From there I'm thinking that means surely the intake boot isn't restricting anything, and I'm adding on the established 5-7 hp gain people see when chipping a 2.5. I just want to physically understand what makes it more or at least see a secondhand dyno because that much power at that cost with the simplicity is really uncommon. And I'd probably go buy it.

[digger]

the PSIK does NOT just replace the AFM, it replaces everything upstream of the throttle body so the elbow, AFM housing, airbox and filter and motronic. did you not see the "MORE DYNO TIME" section in your link thats probably more relevant but not 100% equivalent? also Miller claim the length of the pipe is important. my own testing told me the intake pipe length isnt as important as their dynos show but YMMV.

this last test is a shorter version of the PSIK so the gains arent far off



at the end of the day you can do your own tests, i haven't seen any independent tests show as impressive gains on their site but i did see a dyno which was not too far off IIRC. i believe the gains would be good BFYB anyway considering its a relatively simple install (almost PNP) and the MPH data on their site suggest gains of alot more than a few hp.