Hey guys, i finally got my car all together & what not. I've got about 100 miles on it now with a street tune, just tryin to get it all preped for some dyno time.

The problem that i'm having is i'm falling out of boost between shifts, i have a feeling that it has something to do with my cams. It definatly didn't do it with my built non-vtec LS motor last year. My new setup is as listed below.

DART b20 block (9.0:1)
DART cnc ported head with oversized valves (in. 34mm / ex. 28mm)
Cams IN: .485, 252 / EX: .466, 262
Stock flywheel

not sure what other info would be relavant. Am i nuts to think that it might be due to the cam overlap? Lemme know if there is any other info that might u help me!

 

those cam specs look rather small.


what trans is in the car ?

 

Trans, turbo setup, redline, etc...

 

Trans is a b16.

Turbo - GT3582
Manifold - Homemade top mount (no probs last year)
Intercooler setup - JRC 8inch & 2.5 inch piping
Intake Manifold - Edelbrock victor x

I was shifting at about 8500 last night, i'm sure i'll be winding it up higher due to the built head, but i was being cautious right now.

 

no wonder "its falling out of boost" you are probably dropping a good 2500- 3500 rpm between gears, and its falling out of the "power band" if you rev it up another 2500 rpm everything should be peachy.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaveF &raquo;</TD></TR><TR><TD CLASS="quote">no wonder "its falling out of boost" you are probably dropping a good 2500- 3500 rpm between gears, and its falling out of the "power band" if you rev it up another 2500 rpm everything should be peachy. </TD></TR></TABLE>

i guess it's just my paranoia getting the best of me. I'll take it up to 9000 tonight & see what it does.. & then move up from there. It's just taken me for ever to get this thing to where i have it now & i don't wanna hurt it! I guess thats what it's built for tho, time to give her hell. I wanna make sure everything is right before i take it to the dyno.

 

i recomend not doing what you are doing right now. that will ruin everything you just spent all that time and money on. boosting on an untuned car = big no no in my book. unless you are logging everything and checking the logs/checking plugs on it after every run, id be extremly weary of doing that. dont let your right foot get the best of ya !!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DaveF &raquo;</TD></TR><TR><TD CLASS="quote">i recomend not doing what you are doing right now. that will ruin everything you just spent all that time and money on. boosting on an untuned car = big no no in my book. unless you are logging everything and checking the logs/checking plugs on it after every run, id be extremly weary of doing that. dont let your right foot get the best of ya !!</TD></TR></TABLE>

I've been making adjustments just about every time i get on the gas. I've been tuning it with crome pro. I've got a PLX wideband, & an Ostrich, along with my datalogging cable. I'm not that retarded!

 

report back with results. ! and be careful out there