just installed toda spec B cams, injectors, fuel pump. Ported and polished the head.


Here are the spec's

Spec B
Toda valve train
JDM block
Power FC
440 RC injectors
Walbro fuel pump
spoon header
2.5 exhaust
comptech icebox

have done a compresion test, 200 across the board

The car feels like its being robbed of power, enought torque though..

Any thoughts??? Have tried taking off the intake and running on dyno. Tried the exhaust for possible blockage? anything else??? could it be fuel? Also have tried moving the vernier cam gears, advancing and retarding.

If the cams are not dialed in 100% to toda specs, coould this be the problem??


Help Guys!!!

 

oh, the cars is a dc2 itr.. thanks

 

um, have you not dyno tuned it? If not, thats why, your cams arent plug and play. As far as the compression goes, that is awfully low compression for a JDM block, you should be seeing 240++, but if its even then I guess you should be fine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RRa_kcaLb &raquo;</TD></TR><TR><TD CLASS="quote">um, have you not dyno tuned it? If not, thats why, your cams arent plug and play. As far as the compression goes, that is awfully low compression for a JDM block, you should be seeing 240++, but if its even then I guess you should be fine.</TD></TR></TABLE>

what compression tester are you using? try again and make sure you do several cranks. the good thing is that the numbers are even, it just might not be getting a good read

 

He is right though about the tuning. Why would you put your car on a dyno and not tune it? That would be like doing a brake job and not turning the rotors. Just doesn't make any sense. Go and get it tuned properly first and then tell us how you feel about it.

 

I'm curious about what compression the pistons are. If your bottom end is stock, you may have done more harm than good.

Where's Marshal...?

 

sorry guys, have completed tuning with my tuner.... as for numbers.. the guage has not been calibrated so i'm just taking the figures accross the board as good...

just remeber it is audm whihc is the equiv of jdm therefore CR is around 11.1

 

so far the car does respond to tuning, it has the "expected" power curve. It just appears that something is holding her back from making real power

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jansenrw &raquo;</TD></TR><TR><TD CLASS="quote">sorry guys, have completed tuning with my tuner.... as for numbers.. the guage has not been calibrated so i'm just taking the figures accross the board as good...

just remeber it is audm whihc is the equiv of jdm therefore CR is around 11.1</TD></TR></TABLE>

I think 11.1 is to low. Should be more around 12.0 to 12.5 to reep the rewards of those cams. Though I'm an ex-turbo guy turned N/A douche bag

 

yea compression sounds a tad too low for those cams. although you never know untill its tuned. that could be the whole problem right there.

 

I've seen ~200whp on stock block USDM ITR's with Toda Spec B's. I dont think your CR is a problem.

Are you off a tooth on your timing maybe?

 

Did you take it to Adrian? He would be the one to know...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jansenrw &raquo;</TD></TR><TR><TD CLASS="quote">so far the car does respond to tuning, it has the "expected" power curve. It just appears that something is holding her back from making real power</TD></TR></TABLE>

WTF does that mean? Post your dyno chart. If it's been properly tuned and makes good power on the dyno maybe you have to recalibrate your ***.

 

your injectors are too large for that setup for one...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Azcheron &raquo;</TD></TR><TR><TD CLASS="quote">your injectors are too large for that setup for one...</TD></TR></TABLE>

What the ...

Seems to me that it's purely a tuning issue since he has a standalone and besides playing with cam timing, there is no mention of fuel tuning.

 

hmm all responses seem fair to me... as for larger injectors????? Checked with their duty cycle, and it seems that we can still get up to 80%...

Thinking timing definately could be the issue here. As for my butt dyno, We have not road tested the car yet, all figures are purely dyno orientated. There is power loss, Intake, Exhaust has been checked for restrictions. My .02 is that it might be fuel, timing somewhere (or even compression) - is there anything else that my effect power??

 

calibrate your ***, haha

 

thanks...

we're still baffled... any other imputs??? what would be the other things to check.. surely there have to be some guru's out there

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jansenrw &raquo;</TD></TR><TR><TD CLASS="quote">as for larger injectors????? Checked with their duty cycle, and it seems that we can still get up to 80%...</TD></TR></TABLE>

I hope you arent saying that you are running the 440cc injectors at 80% duty cycle, but rather saying that you had your OEM injectors at 80% or higher and thats why you moved to the larger injectors. Granted they are large injectors, but that can all be taken care of in the tuning.

 

it appears that the duty cycle of the larger injectors are getting up there. my OEM injectors hit 90+% on WOT.

As for fuel pressure, we're adjusting according to the dyno. I'm really stuffed and beat on this power loss thing. I'm sure the ported head cannot cause a potential 20kw loss!!!

ARGHHHHHH

 

You should not be comming close to 80% duty cycle on 440cc injectors with such a mild build.

 

just wondering, spoon 4&gt;2&gt;1 headers would not be that restrictive as to withould big kw's right? On the great header test they performed quite well....

so could this problem be fuel related???

 

Are you going to post up your dyno results or not? How are we supposed to help you when we don't even know if you have a problem to begin with?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mythias &raquo;</TD></TR><TR><TD CLASS="quote">You should not be comming close to 80% duty cycle on 440cc injectors with such a mild build.</TD></TR></TABLE>

Bah, says who? 250whp with TODA B's and a stock bottom end is childs play.

 

sorry I dont have the dyno's on me, alll i can say is that the torque that the engine is making is acceptable whereas the peak power REALLY suffers