hey guys,i recently fit a set of itr cam's to my b16.
standard valve train,standard ecu!
the car aint running right at all,there is a massive flat spot
from 3000 rev's to 4350 rev's then its ok but as the car crosses over at 5800rev's
there is another flat spot.after that it goes like hell,
i re-checked all parts,checked engine timing and spark timing,all are ok!
i have searched high and low for prob's but no answers.
any idea wat it could be.
Do i need to fit adjustable pulleys and alter my exhaust cam to itr spec?
any info would be greatful thanx

 

did you readjust the valves after swapping cams

 

na dude,didnt even think of it!
do you think the flat spot could be from that?

 

Probably not i have itr cams on a stock b16 valve train and it runs fine other that a little bit of ticking noise from the valves. I have also had itr cams on stock gsr valve train and never run into any problems.

 

is it "flat" when your vtec cracks? if it is then it is cracking too early. get a tune.

 

@ crackerjacker006 did you run adjustable pulleys?ill have one more look over it tomorrow and if no change ill wip them back out. i have tryed with a ctr ecu but no difference really.i have a b20 to start on so i really just dropped them in to see what they are like,what gains etc...

 

if you hear ticking, you need to do a valve adjustment

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EK Dave &raquo;</TD></TR><TR><TD CLASS="quote">@ crackerjacker006 did you run adjustable pulleys?ill have one more look over it tomorrow and if no change ill wip them back out. i have tryed with a ctr ecu but no difference really.i have a b20 to start on so i really just dropped them in to see what they are like,what gains etc...</TD></TR></TABLE>

No, I have them with stock cam gears and all, it doesn't give me a flat spot, but there is ticking because the valves need to be adjusted because itr cams have larger lobes than b16 ones. When i use my p72 ecu i have a flat spot, but that is due to the absense of IABs but with a socketed p28 ecu yours should run properly with a little ticking as the rpms climb.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EK Dave &raquo;</TD></TR><TR><TD CLASS="quote">hey guys,i recently fit a set of itr cam's to my b16.
standard valve train,standard ecu!
the car aint running right at all,there is a massive flat spot
from 3000 rev's to 4350 rev's then its ok but as the car crosses over at 5800rev's
there is another flat spot.after that it goes like hell,
i re-checked all parts,checked engine timing and spark timing,all are ok!
i have searched high and low for prob's but no answers.
any idea wat it could be.
Do i need to fit adjustable pulleys and alter my exhaust cam to itr spec?
any info would be greatful thanx </TD></TR></TABLE>

You need to get it tuned for the new cams for optimal performance, I can almost guarantee that's the problem. The stock B16 fuel/ignition tables are for a B16 cam shafts, the ITR cams have a higher lift and longer lift duration, it's dumping more air in there then the fuel table is expecting.

You need to get it tuned - I'd be careful doing what you're doing, you're probably running lean, and if you keep nailing the redline running lean you're gonna be seeing con rods in places they shouldn't be.

 

The ITR cams have a slightly higher "downturn" after VTEC engages. I noticed this as well after I installed my ITR cams. I ended up getting a flat spot at 5400-5600rpm tuned out by engaging VTEC at 5800RPM, and adding some fuel in the crossover area with my VAFC. Now there is only a slight hesitation during crossover, much less noticeable than with the stock cams.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowcivic2k &raquo;</TD></TR><TR><TD CLASS="quote">The ITR cams have a slightly higher "downturn" after VTEC engages. I noticed this as well after I installed my ITR cams. I ended up getting a flat spot at 5400-5600rpm tuned out by engaging VTEC at 5800RPM, and adding some fuel in the crossover area with my VAFC. Now there is only a slight hesitation during crossover, much less noticeable than with the stock cams.

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You/him would have better results if you just did it the proper way (had the fuel tables tuned).

VAFC isn't too far from a hack, especially if you're not using a wideband/A/F gauge.

 

i couldnt afford to get a tune,i was replacing my t/belt and just got a bit hand happy.
i had bought the cams for my b20 build so i put them in just to see wat would happen!
i normally us my ctr p2t ecu and all my bolt on mods the car runs 169whp.im going to take them out cause i have a long distance drive next wk so ill put the standards in! why doesnt the p2t ecu deal with the lift better than the standard ecu


Modified by EK Dave at 10:46 AM 7/25/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EK Dave &raquo;</TD></TR><TR><TD CLASS="quote">why doesnt the p2t ecu deal with the lift better than the standard ecu

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because it wasnt designed to from the factory. 169whp from a bolt on's b16? that's quite the feat.

 

Adjust your valves and get a tune. This will solve your problem.