Alright peeps, I am having some major problems. I have a B18c6 with Jenvey ITB's, it has EK9 pistons, s2s2 Pros cams, flat valves, some head work, JDM 4-1 DC mani and exhaust system. It is mapped with DTA stand alone managment with 340 injectors.

The thing is only putting out 170WHP which is about standard power

The gentlemen who built it said to use the standard ITR airbox without resonator and cold air feed and run this to a custom airbox over the ITB's, this way you get reliable cold air especially on the rollers. He used a standard B16 intake tube (only one available) from the ITR airbox to the ITB airbox. Could this be causing the problem with the lack of power. The car has no benefits from the ITB's at the moment, no midrang grunt and very mild top end power. The tuner is adament it is mapped perfect and reckons it has something to do with the inake stuff.

What are the best ways to run ITB's? box off, box on?

At this moment we are opting to stick with running the ITR airbox to get consistent cold, clean air but use a much wider intake piper - 89mm to be exact - Will this make the difference?

Has anyone had experince in this?

What sort of power should it be running, I know for sure it must be over 170 WHP as I have seen peeps with 200whp on a similar spec without ITB's. I realise ITB's are only gona give a maximum of 10WHP peak so how much increase should i have expected in the midrange over stock?

Any help would be great

T

 

Here is my recent dyno comparison of itbs(twm) with and without airbox(twm):

Bold line: with airbox
Thin line: without airbox



With the airbox on, the engine felt torquey in the low/midrange but suffered at the high end.I've tried 3 styles of intake piping with the airbox(cai,short ram,long ram) but the high end still felt FLAT.I've heard of ppl using a wide airbox facing the windshield to get the low-pressure colder air from there, but the bonnet needs to be raised quite high.I've experimented with a front ram airbox scoop(kinda like a wrx style) with awful results, think that its because of turbulance.My advice is just to leave the itbs naked.

 

have you ever had a single throttle and manifold on this setup?

 

The tuner says he will not get enough cold air on the rollers to map it without an airbox which seems strange as how would he get cold doing it with the airbox on.

So you have had best results without the airbox then? Mine suffers very bad at bottom end and midrange, it picks up very well but thats still only 170WHP peak. What about trumpet lengths, the setup at the mo is with trumpets on under the airbox. Would the intake stuff really loose me 40 WHP.

 

No never had the standard IM and TB on it.

 

I will get measurements later for you guys, the actual OEM airbox is an ITR one so whatever the exit diameter is on that 87mm?? and the inlet on the Custom airbox is the B16 intake tube diameter 65-70mm?? (possible problem area). Thinkingof going with 89mm pipe with the custom box modified to fit the 89mm pipe.

 

The inlet of your box looks too small, and placed wrong. Call Simon @ Jenvey are you using the S-60 ECU or E48?

 

I am using the E48 with the LM1 wideband, I wish I had the S60 but it costs a small fortune. I will see what simon says 2mrw then. deffo something to do with airbox then?

 

Nothing wrong with the E48 I have used them for the last 6 years, much better than the Hondata and AEM (GEM) stuff most use here. The S60 does seem trick and have ordered a couple. Send Simon your pics, he can tell you what to do.
See if you can get your car on Alan's Rototest dyno. (DTA)

 

The tuner that is doing my car is very good friends with the guys from DTA and he has actually been helping develop the S-60. I will get pics to Simon today hopefully. Whats your experince of using bodies in general and what about your experience with an airbox on them?

T

 

The stock air box, with a velocity stack in the air box, and a cold air tube running to the bottom of the box, is the best combination I found for a street car. It's tuned length for the hi lobe without sucking in hot air from the bay.

 

Just spoke to Jenvey and he is confused to why the guy has used the standard box?? He said just put some filter socks over the bodies and map it. He said the Airbox is not needed at all. He said to make a plate for the bodies? i was confused on this, but i think he wason about putting a plate under the bodies and around the back to block hot air.

The engine is in a EK4 and the front grill is EK9 style so plenty of cold air goes into the engine bay.

What is a Velocity Stack? are they airhorn sort of things becuase I have 90mm ones on it at the mo.

Are you saying to keep the ITB box??


Modified by hero_honda at 8:46 AM 9/26/2006

 

Cheap shot but need more info please