rdssk8rcs1

Dynoed the car for the first time since a wire tuck. First run was 285 whp @ 15 psi half-assed tuned. After tuning the car @ 15psi the pressure was turned up to 20-21ish psi for a disapointing 300 whp after tuning. Any ideas why? Even the 285whp number at 15psi is very low, this exact set up made 360whp @15 psi last year.

Compression 225psi all across
Good leak down
Mechanical timing good

Set up consists of LS/Vtec 8.5:1 pistons, rods. Slightly ported head. T3To4e. Log manifold, skunk intake manifold and 1000cc injectors

turbociv910

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rdssk8rcs1 &raquo;</TD></TR><TR><TD CLASS="quote">Set up consists of LS/Vtec 8.5:1 pistons, rods. Slightly ported head. T3To4e. <U>log manifold</U>, skunk intake manifold and 1000cc injectors

</TD></TR></TABLE>

theres your problem. and the small turbo is not helping.

rdssk8rcs1

Well lick i said, this exact set up made 75 more whp last year. Only difference was the entire car was disassembled and sat for a couple of months then put back together. Only engine parts that were changed were injectors, from 750ccs to 1000ccs.

Im kinda wondering what I did wrong assembling it or what happened when it sat.

RC000E

If the setup didn't change, then why did you go to an even larger injector? Boost leaks, tuning, clutch slippage on the dyno....could be multitudes of issues. Also, 225psi on a compression test with 8.5:1 compression...I don't know about that one.

DaveF

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RC000E &raquo;</TD></TR><TR><TD CLASS="quote">225psi on a compression test with 8.5:1 compression...I don't know about that one. </TD></TR></TABLE>

i agree, my 9.0-9.5:1 motor doesnt even pump 170 when its warm

narfdanarf

sounds like boost leaks to me.

EARLdaSQUIRREL

also what is used for tuning?

HiProfile

Maybe the fmic is plugged up somehow? Only thing I can think of is a leak or something causing charge pipe pressure drop is pushing the turbo out of its efficiency range (IE making 29psi to see 21psi in the manifold). That or same for the exhaust - you have a rats nest in your exhaust system or cat is plugged.

FYI a modest d16 can make 300whp with a 50trim t3/t04e. Something is really wrong there. Check your valves (leakdown) to see if something else is balled up. Maybe you skipped a t-belt tooth??

Just noticed you had a wire tuck done. Can I quote your post in the future how wire tucks sap 75whp?

rdssk8rcs1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RC000E &raquo;</TD></TR><TR><TD CLASS="quote">If the setup didn't change, then why did you go to an even larger injector? Boost leaks, tuning, clutch slippage on the dyno....could be multitudes of issues. Also, 225psi on a compression test with 8.5:1 compression...I don't know about that one. </TD></TR></TABLE>

Went to larger injectors bc last year when it was being tuned we were maxing out the 750cc's so while the motor was out and I was working on it all I decided to get that done as well.

The compression test didn't seam right to me either. I think the gauge might have been bad. But what would cause such high compression?


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">Maybe the fmic is plugged up somehow? Only thing I can think of is a leak or something causing charge pipe pressure drop is pushing the turbo out of its efficiency range (IE making 29psi to see 21psi in the manifold). That or same for the exhaust - you have a rats nest in your exhaust system or cat is plugged.

Just noticed you had a wire tuck done. Can I quote your post in the future how wire tucks sap 75whp? </TD></TR></TABLE>

That exactly what i was thinking. And yes, that quote is all yours.

If I was able to get a copy of the dyno sheet on here you could see, The sheet look identical to all my other "good" sheets up until 5000 rpm. It just about makes the torque it always did at 5k, then instantly drops. When it used to make the torque and hold it till redline.

Does that information help at all?

Garage 808 Hatch

something wrong with vtec???

rdssk8rcs1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Garage 808 Hatch &raquo;</TD></TR><TR><TD CLASS="quote">something wrong with vtec???</TD></TR></TABLE>

Its engaging

RC000E

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rdssk8rcs1 &raquo;</TD></TR><TR><TD CLASS="quote">
The compression test didn't seam right to me either. I think the gauge might have been bad. But what would cause such high compression?</TD></TR></TABLE>

Yeah, as long as the numbers are consistent then your fine, but I'd venture to say that gauge is off.

Did you compare the dyno roller rpms to the motor rpms to be sure there was no clutch slippage? Pressure test the piping, check your gate and gate spring to be sure your not getting any gate leakage early as well. Where is your vtec crossover versus where your seeing the torque drop begin?

rdssk8rcs1

After taking a loser look at the sheet I am relizing how messed it really is. Use to make the same amount of torque at 5k that it now makes at 6500.

I took a picture of the recent sheet....


And heres my old one....

turillo

Turbo might be @ end of life, boost leak, crak in the FMIC? bad tune?

rdssk8rcs1

Thats what im thinking, as far as either a turbo or leak goes, any other thoughts opinions?

RC000E

Yeah, boost leak or clutch slippage. How consistent were back to back pulls...were they erratic or fairly consistent.

rdssk8rcs1

didnt seam to be slipping at all. I did notice today that there seems to be a little more oil seeping from the seals on the turbo than i would like

Boner_Ben

Somethings going on up top, possibly a big *** boost leak. The manifold and turbo is not holding you back.

CoreyR

what kind of dyno was the recent dyno, i wouldnt compare evans dyno to anything because his read high. thats probably most of your power loss issue.

CoreyR

nevermind i see you were at D&G which has a dynapack. i wouldnt compare between different dynapacks because that read differently based on how they are calibrated.

rdssk8rcs1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CoreyR &raquo;</TD></TR><TR><TD CLASS="quote">nevermind i see you were at D&G which has a dynapack. i wouldnt compare between different dynapacks because that read differently based on how they are calibrated.</TD></TR></TABLE>

Yes i agree but 75 whp overall? And also, not reaching peak TQ until 6800rpms? Something is definitly going on.


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boner_Ben &raquo;</TD></TR><TR><TD CLASS="quote">Somethings going on up top, possibly a big *** boost leak. The manifold and turbo is not holding you back. </TD></TR></TABLE>

Exactly, but its not only happening up top. Before I would reach peak TQ at 5200 Rpms and hold it while now I reach it at 6800 and drops

CoreyR

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rdssk8rcs1 &raquo;</TD></TR><TR><TD CLASS="quote">

Yes i agree but 75 whp overall? And also, not reaching peak TQ until 6800rpms? Something is definitly going on.


Exactly, but its not only happening up top. Before I would reach peak TQ at 5200 Rpms and hold it while now I reach it at 6800 and drops</TD></TR></TABLE>

oh no theres definatley something wrong because the powerband is different and you have a big drop in power up top. what did you do with the new injectors, have someone retune or did you just rescale the map for the 1K's. i find it hard to believe you were maxing out 750's with 360WHP. i made 345 on 680's and i wasnt even close to maxing them.

rdssk8rcs1

Well I made a little over 400whp at 19 psi last year. I was just using the 375whp numbers because they are easier to compare with the 15 psi numbers I made this season. The car was retuned this year by the same tuner who tuned the car last year.

22psicrx

Jeff Evans tuned it on 550cc at 93% duty cycle. I sold him a set of 750cc from my shop. I street tuned it to 80% duty cycle. 3 months later the car was put on a dynojet in Norwalk,ct. No tuning and the first run was 355 and 260 torque. The dyno was new and they did not know how to operate it so the wheels kept slipping even with 3 people on the hood.
that was a 1 year and a half ago. He gave me the 750cc injectors to put in my daily driver and a bought him new rc 1000 about 2 months ago.
I then purchased a Dyna pack 4000 and he finished his car. I did about 30 cars before his that had no problem except mine and we both have rc 1000.
There is no change in torque when adding timming or subtracting timming. There could be a ground issue but my car has the same problem.
My car b16 fully built w/f-r stage 2 25 psi 400hp. I believe my turbo is bad leakdown good and 9.5 comp is 200,200,200,200. 60-1 .63. I dyno graph looks like his. I have not found a boost leak either and both cars have avc-r boost controller and s200 hondata.
More data just ask questions. Not all the time it is the tuner.

Pay2play killa

CHeck your cam timing; if your intake or both cams are retarded it will move the peak power down lower in the rpms....

kinda like how its doing according to the dyno graphs you posted. tq will taper off hardcore


that or the turbo could be dying

/edit: and since your compression numbers are so high that leads me to believe its cam timing. I had a similar problem when a guy i know whos car i tuned wasn't making any power at all, like less than stock hp on an ls even though he had a 50 shot of spray on it; turns out his intake cam was off pretty nasty.