Y3K

Hello everyone

1st of all ..thanks for such an informative forum

You probably have heard it before ...but I & most of my LS1 fans - here in SA - browse your forums always, looking for answers or just to chat over a subject.

We do respect your members opinions & figures, and we put them to work in our rides ..therefore I wish you can help me here, or guide me to the right section of your forums to post this question.

A friend has recently swapped an LS1 in his '70 Z240. Engine is topped with Fast90 intake and 42 injectors, G5X4 cam and Patriot 64cc heads.

We expected big numbers on the dyno, yet we were disappointed to see almost 270rwhp !!!

they guys running the dyno said pressure is low too & we don't know where to look for errors ..

can any one help ??

Thanks again

Smokin00WS6

iTrader: (4)

Welcome. Glad to hear you joined us on Tech. Man, I was reading your post and when I saw 270 RWHP I almost fell off my chair. There is totally something wrong. Umm......I might start with a compression test to see what is going on in the cylinders. What kind of dyno was used for the tune. Im thinking that after doing those mods, a tune is definately needed, and there are so many changes that I wonder is something wasnt right when the car was on the dyno. Im going to think of some things and see what I can come up with. I know some of the Veteren guys will chime in and give some advice, but that has me stumped. Something is very wrong. You know what, something as stupid as a spark plug or wire could be bad, maybe change them out and see what happens. How did the rpm range sound, did it sound slow, did the car seem like it was rough??? Let us know.

And welcome again.

Y3K

Thanks Smokin00WS6 & My pleasure 2 B here..

Latest news ..

Installed new set of sparkplugs / wires &
discovered a leak in the intake ( holes for future direct port NOS were not sealed completely )
We are planning to open up the exhaust ( recent is longtube headers through two muffflers / 3" pipes

To answer your Qs..

RPM kinda OK, becomes wild & fast after 3500 RPM

& Yes .. the engine sounds rough ( in idle )

Thanks for stoppin' by

Smokin00WS6

iTrader: (4)

Sweet, sounds like you may have found the problem. Let us know what you find. Maybe a little timing in there will fix it all. Sweet. Got any pictures or videos of it???

SMALLBLOCKHERO

iTrader: (2)

WELCOME! whatcha doin in saudi?...serviceman?

Y3K

Yeah Smokin' ..

I think we R going N the right direction ..
I will post some pix & a clip from the dyno too ( F things get better )


--

SMALLBLOCKHERO ..

The answers for yr Qs as follows :
I live & mustangs here
No I am not

Thanks 4 stoppin by

Ghazi

Smokin00WS6

iTrader: (4)

Sweet, do you know for sure if it is running better?? If you could check the timing I know that could help. One other thing is clogged fuel lines. Maybe a fuel pump/filter. Plus are you running the proper injectors? Im just trying to think of anything that is small or stupid that could cause this. Ill keep on thinking until you get it fixed . Good luck.

Mike

Z240LS1

Thanks Y2K and Smokin for your help,
car was much better with open headers, I will post the dyno sheet after replacing my old 2.5" exhoust with the 3" pipes.

http://video.google.com/videoplay?do...45346497392155

http://video.google.com/videoplay?do...23737920128881

Y3K

Hey Mike ..

My buddy Z240LS1 just uploaded the vids U asked 4.

He managed to block the leaking areas with a temporary fix ..

bottles cork

yeah thats right .. cork

Well things got better, as he says, after opening up the headers yet the Dyno kept on turning off 'coz of vibration on its platform !! ( according 2 guys @ the Dyno )

We will keep U posted with latest news.

Thanks Z240LS1

GEARHED

iTrader: (5)

Check the conversion and hybrid forums, you will get a lot of information there from the swap.
All tech forums here will get you better than the current 270rwhp.

Smokin00WS6

iTrader: (4)

Wow, the car sounds amazing. I bet that thing is going to haul when you get it the way you guys want it. The only thing bugging me is in the dyno, it sounds like it took forever to get to redline, unless it started in a very very low rpm range. Once you get the bugs out of it, that is going to be screaming. Thats awesome. Keep the updates coming. Z240LS1, whats up man. Nice car, you and Y3K better keep up the good work.

venom ws7

iTrader: (13)

Y3K Wellcome to the Forums man I'v been here since 2003 Its the best site ever you'll love it here Great Pepole with great Info I'v learned alot of stuff here.

And I live in Jeddah Saudi Arabia I Hope we can meet soon.

Y3K

GearHead
I bet ya we'll get the best out of this car .. couple more tricks here & there & we will be fine ..

Thanks 4 the tip & glad 2 hear from ya


Mike ..
U R right ..they do start from low RPM, yet the Dyno itself is facing some trouble & we R looking for another one to wrap up this mission

We'll keep it up


venom ws7
U R right homeboy .. its the best site & the best ppl

Nice wheels U got there .. we shall meet in the upcoming event @ Jeddah Circuit

Here is a shot of the engine ( B4 cleaning it up )

Bad30th

iTrader: (13)

Welcome ! That's gonna be a fun ride.

Rob (Bad30th)

Y3K

Breaking & News

My pal found out that TWO of the injectors R not workin'
so he replaced them with new set & the existing Fuel pump with a 255 unit,
opened the headers w/ 3" pipes & adjusted the AFR to almost 13

Result was great ..

346 RWHP and 309.4 lb torque

Here is the chart & the clip 2 prove it

http://www.saudihotwheels.com/vb/att...3&d=1191414819

http://video.google.com/videoplay?do...23275820032273

So I think we can rest in peace now ( at least 4 couple of months )

Finally .. I would like to thank all of you, and especially Mike for standing by us ..

Thanks guys .. U R the Best

Y3K

Rob ..

Thanks ..

U bet it is fun over here ( lots of power, open roads & cheap fuel )

Smokin00WS6

iTrader: (4)

Freakin Sweet. Nice. Im glad you got it all figured out. Injector, man what a pain in the ***. Couldnt see the video, it was down from you tube, try to put it back. Those are some good numbers. Keep it up!!!!