86White_T/A305

Ive been itching to see what gain I would have from switching my heads from the 317 to milled 243 heads and trying to fix as many small issues that held me down on power and driveability.Last year the car made a whooping 310whp/325tq on this same dyno all mods the same minus new plug wires and o2 sensors.

The bad news:
-major voltage drop while making pulls..either my belt is slipping or my alternator is taking a dump.drops to 11.7v above 4000rpm
-not getting codes while I drive but found misfires on 1 and 6cyl..might also be from voltage or bad coils
-my tpi cai with 3 inch cone filter to my 4 inch 85mm maf is proving to be too small
-my pressure plate is making some loud rattling noise around 1700rpm

Other than that the car needed some timing added and some fuel but the a/f was spot on.Got it to make 370whp/380tq still on stock manifolds with the above issues.Quite an improvement.I think I might be able to squeeze another 10hp if i iron out my misfires..and get a new alternator that feeds the car while i drive..it was literally dimming the lights as the car pulled in the band :S
Vids will be up soon

86White_T/A305

side note..this c6 race car went on the rollers after me for a tune..to take power out for its class ..stupid rules.let it eat

cam-

Do the resistor mod exciter trick to your alternator and try that. Ive had some issues using PCM feed to excite alternators. Its uber easy you get a 480 ohm resistor and wire a 12v+ from bat to the single red lead coming out of your alt and remove the lead from the PCM.

Theres lots of info on tech. Heres a thread

http://ls1tech.com/forums/conversion...istor-alt.html

cam-

BTW 370 through manifolds is BADASS!!! I did 373 through Hawks LTs but I was on 853 heads. Shows you how good those 243's are eh? Mint

86White_T/A305

Yea I was guessing 350ish ..but 370..maybe a bit more if i find my 2 misfire culprits.Im using a truck alternator that i though survived my power steering line leak..but i guess sitting over the winter and the moisture buildup it just doesnt want to pump out volts now.my alt guy is 2 blocks away..not a big concern to fix that part.

Im pleased..now it feels like a cammed ls should.God now i want headers more so than before ..the guys dynoing didnt realize i was on stock manifolds and were impressed for lil is done to the setup

cam-

Id guess theres 30 there with the 1 3/4" headers and a 3" y-pipe into a single 3.5" maybe even 40 pending how good/bad your exh is now. It is a high number for manifolds thats for sure. My ground clearance is super tight so i only run a 2.5" y into a single 3" and it works decent. Id like to bump the y-pipe to 3" but no time this year I just want to get it on the road again. With my cubes and cam the exh is choking it up a bit now. My old LS1 has a 3" y and 3.5" single now. Runs door handle to door handle with my L92 until 4th gear. He swapped to ported Texas Spd stage 2 CNC 243's and runs 4.10's though. Great heads it pulls hard.

Im still mucking with this L92 I wish I had time to stuff another cam in there now that I know whats what. I kinda blazed trail on this VVT deal though so its to be expected not to hit the mint combo right out the gate. Im working with some others on getting their set up rocking 450+ now. Working on one that should do 9's na with these LS3 heads. Impressive for sure but this is on race gas and huge cam, not a street car. I think with a real nice street cam 470 is reachable with the bigger cubes and square port heads. They certainly are not as easy to work with as the cathedrals though hence why my next build? Is running 243's

86White_T/A305

My 2.5 dual catted y isnt smooth going into my 3 inch catback so im sure that doesnt help exh flow much.I have the 1 3/4 mids with 3 inch collector waiting to go on and then figure out to go single cat and cutout since my car is lowered 2 inches and i drive everywhere.

ls3 top end is nice and all but I just dont need all that.This setup is perfectly streetable..making good numbers for a small build.I havent ported anything yet..change bigger tb or injectors etc..i think it has room to grow as it is.

86White_T/A305

Thread wouldnt be complete without a video

86White_T/A305

not thirdgen i know but was still cool.you can see his graph vs my 2 pulls lol.

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Theres NO WAY id ever tear down a 243 cathedral set up to swap to LS3 top end, especially on a 4" bore. I was just making chit chat there about where im at with mine for conversation sake I didnt mean to suggest for you to switch gears and go that route. You have damn near the ultimate LSx street combo there with that cam and those heads + LS6 intake ( not sure if your running one or not ) but thats the best street strip na set up going as far as im concerned Find me ONE guy who runs 243's and a nice matched cam that isnt over the moon happy?

Hence my using 243's on my next build comment. GREAT heads.

Yes you are right as well plenty of growth room there.

25th327RS

iTrader: (2)

Makes me happy to hear you say that cam, as I am doing a 370 right now, that will be used with a ls6 manifold, torquer cam, and milled 243s. Not hi-jacking a thread, just excited to see the numbers through stock manifolds, as I am in the middle of doing a similar setup through longtubes and duals.

cam-

Yep its best to stick with proven winning combos. None of this is new now really its crazy to think that gen3 LS1 stuff is old school HA! But its such yummy old school man lemme tell ya gen3 LS power.... the best stuff since the orignal sbc. Gen IV is painful to work with ( much more complexity on computer control and tuning ) Gen 5? I cringe.... but it shall be done too

86White_T/A305

I am running an ls6 intake.Im happy with the setup now and want to fix what lil problems exist in it for optimum performance/reliability.After that will be a full exhaust to show what this baby cam..stock/milled heads lq4 has to offer.

25th..im interested to see what yours will do aswell from your current numbers in your sig..should be a nice step up.

I do know..that when/if my lq4 bottom end goes since its stock and i beat like i stole it consistently.Next phase is take the block and go 402ci and have my 243 heads ported etc and custom eps cam..full longtubes.But that will be a money build..no penny pinching and a bucket to collect all the tears from cars that will see my tailights

STREETDEMON

great numbers!...exhaust should really free her up, get the mid-tubes on stat!

cam-

25th327RS

iTrader: (2)

All the same parts from the ls1 that did 394, will go onto the 6.0(.030 over for 370CI). Not sure what to expect, maybe 410? Have no clue what torque will be like. Most 6.0s seem to make more torque than HP, but I can't see that big of a TQ jump just by bumping compression up a few tenths of a point and a larger bore.

86White_T/A305

I think 410-420 is reasonable. that 370ci..should make some strong midrange power,id rather more torque than horsepower with a nice curve..freight training others lol.

Im headed to my track this weekend to make a shake down as the car sits.then hopefully i get better over the summer and lower et's

86White_T/A305

Well yesterday I came home from the track very frustrated and disappointed got a laundry list of things to do on this car before it will pull any decent numbers. I couldnt break out of 13.6@114mph with 2.2 60ft.

So major problems..Clutch and Transmission.I would have to try either dumping it or baby it out of the hole or it would slip through all of first gear,2nd gear would spin quite abit,3rd..would grind on every shift now consisently even under normal driving,4th gear..felt like it was locked out and very hard to get into.Time for a rebuild

Other things that I could feel holding me back was the worn out suspension,the car doesnt quite seem to squat and plant itself like my old car with eibach springs so now for sure they will be put into this car along with my bilstein shock/struts. I also need to get a decent summer tire,my all seasons are about finished now.

Side note everyone seemed to love the car and its topend ability,had some fun driving on the way home with some nice cars and my friend in his v6 92 civic hatch surprised a few people.Here is the track vids I took throughout the day.