Uh.....who said anything about making 500hp??? My set up, from what i was told from the guy who built it should be about 450RWHP .....i know about the fuel pump only because of the dyno..but even changing out the pump, i dont think that will bring my hp up too much.

DAMN MONEY PIT.....It just dont stop

 

You need fuel to make power lol, fix the pump...Wicked94 was replying to ls2pontiac not you lol. Money pits they are indeed!

 

Get all the issues worked out, find out what type of dyno it is(if its a stang dyno youll never see the numbers you want) and I doubt it will make 450rwhp no matter what. You need LE heads for that!!! JK! lol


Oh Im still running a stock fuel pump and puttin down 408 at the moment with a Street twin clutch, when I had a stock clutch it was 414 with a s60. No fuel problems at all. Im also running 37#injectors. Could the 30s be maxed out?

 

i suggest buying the following, this is what i had and i made 405 on a real dyno, not the ones that put out inflated numbers. i literally have the same exact setup as you. Do you have a 9" rear or 10-bolt also?

1 - Racetronix in-tank pump & harness - RX-FLT1-GSS340-FPKG-2 - give Lonnies Performance a call - he had the pump shipped 10 min after i called him

2 -EWP - http://www.exoticperformanceplus.com....html?item=298

3 - i think you need bigger injectors but im not sure. Try a set of 42# Racetronix flow-matched inj's just in case. Lonnies has them also, they are $400. Then get your computer re-tuned before you fire it up, and dyno tune it

 

30s are plenty big enough for that setup

 

I don't think the 30's are maxed out. My dad put down 412 through a stalled auto with 30lb. injectors. It sounds like it's all in the tune. Maybe timing issuses. It had to be lean pulling 10lb less fuel pressure than stock. Def. change the pump, it sounds weak to me. You would be suprised what a tune can do. I picked up 48rwhp on a dyno tune. It was hella lean. Wish he knew some info about the tune.

 

I thought I read about a similar car with 30s they were almost maxed but still getting the job done at like 80% maxed. So I agree. Just typing b4 thinking.

 

Yeah, because supplying the amount of fuel needed for a certain amount of horsepower could NEVER help!

 

I had them buy a 255 lph in-tank pump(overnight), Im running a stock re-built 10 bolt with 373s(should have went 390s). Well this is my first car build ever, and it suck because im never home to drive it or work on it. Another thing about injectors is i cant go too big she still has to pass emissions.

Are my plugs good for this set-up too?? The NGK TR55s?

 

FWIW, the injector size won't have anything to do with emissions...the PCM controls the injector pulse width in relation to the size of the injector. A larger injector will need a narrower pulse width to spray the same amount of fuel as a smaller injector, which requires a wider pulse width.

 

Well these are the 2nd guys to tune my car....the first was in Rhode Island-and it ran like ****, this guys in Connnecticut i was told, know what they are doing... this is what they told me.

 

We shall see.

 

Well thanks for all you feed back Guys!! At least the good feed-back, now im just waitin for the call, to find out some good news for once. i hope

 

Yeah, you really shouldn't jump the gun yet. If your fuel pump was going out then you probably went way lean and that will obviously hurt power and your new motor...What was your a/f ratio? I like to see 12.8-13.0 as a good, safe number...I run NGK TR55s gapped at .035 and have never had any issues with them. Also please don't get too hung up on dyno numbers...My car only dynos 375 rwhp but runs the numbers in my sig...Dyno numbers don't win races, just gives you internet bragging rights...Oh, and FWIW I run a stock replacement AC fuel pump and 30lb injectors with zero issues...

--Alan

 

results?

 

Your 30# injectors should be fine, the owner of Golen Engines just sold his 520rwhp 396 and he was using 30# injectors. And I doubt you will be seeing anywhere near 450rwhp with a 355 using an AI H/C package. Low 400s seem to be the max out point for H/C 355 LT1s.

 

Like Alan said, 30lb injectors and a good stock AC Delco pump is all you need. I have seen too many reliability problems over the years with Walbro pumps to want one in mine. Mine made 532 rwhp through 4400 RPM a non-lock up converter with a stock fuel system and stock AC Delco pump. It ran 9.80s at 137 MPH and I could make black smoke roll out at the finish line if I wanted. You don't need a bigger pump. Just a good working one. I would put a new GM/AC Delco pump in it.

Btw, injector size absolutely has nothing to do with emissions. Tuning does. I have several 65lb injectors cars passing California emissions tests.

Who built the rest of the engine have a lot to do with power output levels. Hell, just how the cylinders were honed have a lot to do with it.

 

I don't see why 450rwhp couldn't be obtained with a 355 and full boltons.

 

+1.

450whp is certainly not impossible. My numbers, granted, are with a 383, but through an auto and a 9". I bet my setup through a 10-bolt and M6 could easily put down 450whp.

Then again, horsepower is just a tuning tool anyway, so who cares.

 

It's not hard to do if the engine builder knows what he is doing.